View MAX5094AASA_480109.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-3864; Rev 3; 10/06
High-Performance, Single-Ended, Current-Mode PWM Controllers
General Description
The MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, highperformance, current-mode PWM controllers have all the features required for wide input-voltage range isolated/nonisolated power supplies. These controllers are used for low- and high-power universal input voltage and telecom power supplies. The MAX5094/MAX5095 contain a fast comparator with only 60ns typical delay from current sense to the output for overcurrent protection. The MAX5094 has an integrated error amplifier with the output at COMP. Softstart is achieved by controlling the COMP voltage rise using external components. The oscillator frequency is adjustable from 20kHz to 1MHz with an external resistor and capacitor. The timing capacitor discharge current is trimmed allowing for programmable dead time and maximum duty cycle for a given frequency. The available saw-toothed waveform at RTCT can be used for slope compensation when needed. The MAX5095A/MAX5095B include a bidirectional synchronization circuit allowing for multiple controllers to run at the same frequency to avoid beat frequencies. Synchronization is accomplished by simply connecting the SYNC of all devices together. When synchronizing with other devices, the MAX5095A/MAX5095B with the highest frequency synchronizes the other devices. Alternatively, the MAX5095A/MAX5095B can be synchronized to an external clock with an open-drain output stage running at a higher frequency. The MAX5095C provides a clock output pulse (ADV_CLK) that leads the driver output (OUT) by 110ns. The advanced clock signal is used to drive the secondary-side synchronous rectifiers. The MAX5094A/B/C are available in the 8-pin SO and 8-pin MAX (R) packages. The MAX5094D and MAX5095A/B/C are available in the 8-pin MAX package. All devices operate over the automotive temperature range of -40C to +125C.
Features
Pin-for-Pin Replacement for UCC28C43 (MAX5094A) and UCC28C45 (MAX5094B) 2A Drive Source and 1A Sink Capability Up to 1MHz Switching Frequency Operation Bidirectional Frequency Synchronization (MAX5095A/MAX5095B) Advanced Output Drive for Secondary-Side Synchronous Rectification (MAX5095C) Fast 60ns Cycle-by-Cycle Current Limit Trimmed Oscillator Capacitor Discharge Current Sets Maximum Duty Cycle Accurately Accurate 5% Start Voltage with 0.8V Hysteresis Low 32A Startup Current 5V Regulator Output (REF) with 20mA Capability Versions with 0.3V Current-Sense Threshold Overtemperature Shutdown
MAX5094A/B/C/D/MAX5095A/B/C
Ordering Information
PART MAX5094AASA MAX5094AASA+ MAX5094AAUA* MAX5094AAUA+ MAX5094BASA* MAX5094BASA+ MAX5094BAUA* MAX5094BAUA+ TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 8 SO 8 SO 8 MAX 8 MAX 8 SO 8 SO 8 MAX 8 MAX PKG CODE S8-4 S8-4 U8-1 U8-1 S8-4 S8-4 U8-1 U8-1
+Denotes lead-free package. *Future product--contact factory for availability. Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
COMP 1 8 7 REF VCC OUT GND
Applications
Universal Input AC/DC Power Supplies Isolated Telecom Power Supplies Isolated Power-Supply Modules Networking Systems Computer Systems/Servers Industrial Power Conversion Isolated Keep-Alive Circuits
MAX is a registered trademark of Maxim Integrated Products, Inc.
FB 2
MAX5094
CS 3 6 5 RT/CT 4
MAX/SO
Pin Configurations continued at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
ABSOLUTE MAXIMUM RATINGS
VCC (Low-Impedance Source) to GND ..................-0.3V to +30V VCC (ICC < 30mA).....................................................Self Limiting OUT to GND ...............................................-0.3V to (VCC + 0.3V) OUT Current.............................................................1A for 10s FB, SYNC, COMP, CS, RT/CT, REF to GND .............-0.3V to +6V COMP Sink Current (MAX5094)..........................................10mA Continuous Power Dissipation (TA = +70C) 8-Pin MAX (derate 4.5mW/C above +70C) .............362mW 8-Pin SO (derate 5.9mW/C above +70C)...............470.6mW Operating Temperature Range .........................-40C to +125C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +15V, RT = 10k, CT = 3.3nF, REF = open, CREF = 0.1F, COMP = open, VFB = 2V, CS = GND, TA = TJ = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER REFERENCE Output Voltage Line Regulation Load Regulation Total Output Variation Reference Output-Noise Voltage Reference Output Short Circuit OSCILLATOR Initial Accuracy Voltage Stability Temp Stability RT/CT Voltage Ramp (P-P) RT/CT Voltage Ramp Valley Discharge Current Frequency Range ERROR AMPLIFIER (MAX5094) FB Input Voltage FB Input Bias Current Open-Loop Voltage Gain Unity-Gain Bandwidth Power-Supply Rejection Ratio COMP Sink Current COMP Source Current COMP Output High Voltage COMP Output Low Voltage CURRENT-SENSE AMPLIFIER Gain (Notes 3, 4) ACS (MAX5094A/MAX5094B) (MAX5094C/D, MAX5095_) 2.85 2.85 3 3 3.26 3.40 V/V V/V VFB IB(FB) AVOL fGBW PSRR ISINK ISOURCE VCOMPH VCOMPL 12V VCC 25V (Note 2) VFB = 2.7V, VCOMP = 1.1V VFB = 2.3V, VCOMP = 5V VFB = 2.3V, RCOMP = 15k to GND VFB = 2.7V, RCOMP = 15k to REF 60 2 -0.5 5 2V VCOMP 4V FB shorted to COMP 2.465 2.5 -0.01 100 1 80 6 -1.2 5.8 0.1 1.1 -1.8 2.535 -0.1 V A dB MHz dB mA mA V V VRAMP VRAMP_VALLEY IDIS fOSC VRT/CT = 2V, TA = +25C VRT/CT = 2V, -40C TA +85C 7.9 7.5 20 TA = +25C 12V VCC 25V -40C TA +85C 51 54 0.2 0.5 1.7 1.1 8.3 8.3 8.7 9.0 1000 57 0.5 kHz % % V V mA kHz VREF VLINE VLOAD VREFT VNOISE IS_SC TA = +25C, IREF = 1mA 12V VCC 25V, IREF = 1mA 1mA IREF 20mA 1mA IREF 20mA, 12V VCC 25V 10Hz f 10kHz, TA = +25C VREF = 0V -30 4.9 50 -100 -180 4.950 5.000 0.4 6 5.050 4 25 5.1 V mV mV V V mA SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10k, CT = 3.3nF, REF = open, CREF = 0.1F, COMP = open, VFB = 2V, CS = GND, TA = TJ = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER Maximum Current-Sense Signal Power-Supply Rejection Ratio Input Bias Current Delay From CS to OUT MOSFET DRIVER OUT Low-Side On-Resistance OUT High-Side On-Resistance ISOURCE (Peak) ISINK (Peak) Rise Time Fall Time UNDERVOLTAGE LOCKOUT/STARTUP Startup Voltage Threshold Minimum Operating Voltage After Turn-On Undervoltage-Lockout Hysteresis PWM MAX5094A/MAX5094C/MAX5095A Maximum Duty Cycle Minimum Duty Cycle SUPPLY CURRENT Startup Supply Current Operating Supply Current Zener Bias Voltage at VCC THERMAL SHUTDOWN Thermal Shutdown Thermal Shutdown Hysteresis SYNC Frequency Range SYNC Clock Input High Threshold SYNC Clock Input Low Threshold SYNC Clock Input Minimum Pulse Width SYNC Clock Output High Level SYNC Clock Output Low Level SYNC Leakage Current TSHDN THYST fSYNC VSYNCINH VSYNCINL tPW_SYNCIN VSYNCOH VSYNCOL ISYNC 1mA external pulldown RSYNC = 5k VSYNC = 0V 200 4.0 4.7 0 0.01 0.1 0.1 20 3.5 0.8 Junction temperature rising 150 4 1000 C C kHz V V ns V V A ISTART ICC VZ VCC = 7.5V VFB = VCS = 0V ICC = 25mA 24 32 3 26.5 65 5 A mA V DMAX DMIN MAX5094B/MAX5094D/MAX5095B/ MAX5095C 94.5 48 96 49.8 97.5 50 0 % % VCC_START VCC_MIN UVLOHYST 7.98 7.1 8.40 7.6 0.8 8.82 8.0 V V V VRDS_ONL VRDS_ONH ISOURCE ISINK tR tF ISINK = 200mA ISOURCE = 100mA COUT = 10nF COUT = 10nF COUT = 1nF COUT = 1nF 4.5 3.5 2 1 15 22 10 7 A A ns ns SYMBOL VCS_MAX PSRR ICS tCS_DELAY CONDITIONS MAX5094A/B (Note 3) MAX5094C/MAX5094D (Note 3) VCOMP = 5V, MAX5095 12V VCC 25V VCOMP = 0V 50mV overdrive MIN 0.95 0.275 0.275 TYP 1 0.3 0.3 70 -1 60 -2.5 MAX 1.05 0.325 0.325 dB A ns V UNITS
MAX5094A/B/C/D/MAX5095A/B/C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)
_______________________________________________________________________________________
3
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10k, CT = 3.3nF, REF = open, CREF = 0.1F, COMP = open, VFB = 2V, CS = GND, TA = TJ = -40C to +85C, unless otherwise noted.) (Note 1)
PARAMETER ADV_CLK (MAX5095C Only) ADV_CLK High Voltage ADV_CLK Low Voltage ADV_CLK Output Pulse Width ADV_CLK Rising Edge to OUT Rising Edge ADV_CLK Source and Sink Current VADV_CLKH VADV_CLKL tPULSE tADV_CLK IADV_CLK 10 IADV_CLK = 10mA source IADV_CLK = 10mA sink 85 110 2.4 3 0.4 V V ns ns mA SYMBOL CONDITIONS MIN TYP MAX UNITS
ELECTRICAL CHARACTERISTICS
(VCC = +15V, RT = 10k, CT = 3.3nF, REF = open, CREF = 0.1F, COMP = open, VFB = 2V, CS = GND, TA = TJ = -40C to +125C, unless otherwise noted.) (Note 1)
PARAMETER REFERENCE Output Voltage Line Regulation Load Regulation Total Output Variation Reference Output-Noise Voltage Reference Output Short Circuit OSCILLATOR Initial Accuracy Voltage Stability Temp Stability RT/CT Voltage Ramp (P-P) RT/CT Voltage Ramp Valley Discharge Current Frequency Range ERROR AMPLIFIER (MAX5094) FB Input Voltage FB Input Bias Current Open-Loop Voltage Gain Unity-Gain Bandwidth Power-Supply Rejection Ratio COMP Sink Current COMP Source Current COMP Output High Voltage COMP Output Low Voltage VFB IB(FB) AVOL fGBW PSRR ISINK ISOURCE VCOMPH VCOMPL 12V VCC 25V (Note 2) VFB = 2.7V, VCOMP = 1.1V VFB = 2.3V, VCOMP = 5V VFB = 2.3V, RCOMP =15k to GND VFB = 2.7V, RCOMP = 15k to REF 60 2 -0.5 5 2V VCOMP 4V FB shorted to COMP 2.465 2.5 -0.01 100 1 80 6 -1.2 5.8 0.1 1.1 -1.8 2.535 -0.1 V A dB MHz dB mA mA V V VRAMP VRAMP_VALLEY IDIS fOSC VRT/CT = 2V, TA = +25C VRT/CT = 2V, -40C TA +125C 7.9 7.5 20 TA = +25C 12V VCC 25V -40C TA +125C 51 54 0.2 1 1.7 1.1 8.3 8.3 8.7 9.0 1000 57 0.5 kHz % % V V mA kHz VREF VLINE VLOAD VREFT VNOISE IS_SC TA = +25C, IREF = 1mA 12V VCC 25V, IREF = 1mA 1mA IREF 20mA 1mA IREF 20mA, 12V VCC 25V 10Hz f 10kHz, TA = +25C VREF = 0V -30 4.9 50 -100 -180 4.950 5.000 0.4 6 5.050 4 25 5.1 V mV mV V V mA SYMBOL CONDITIONS MIN TYP MAX UNITS
4
_______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10k, CT = 3.3nF, REF = open, CREF = 0.1F, COMP = open, VFB = 2V, CS = GND, TA = TJ = -40C to +125C, unless otherwise noted.) (Note 1)
PARAMETER CURRENT-SENSE AMPLIFIER Gain (Notes 3, 4) ACS MAX5094A/MAX5094B MAX5094C/D, MAX5095_ MAX5094A/B (Note 3) Maximum Current-Sense Signal Power-Supply Rejection Ratio Input Bias Current Delay From CS to OUT MOSFET DRIVER OUT Low-Side On-Resistance OUT High-Side On-Resistance ISOURCE (Peak) ISINK (Peak) Rise Time Fall Time UNDERVOLTAGE LOCKOUT/STARTUP Startup Voltage Threshold Minimum Operating Voltage After Turn-On Undervoltage-Lockout Hysteresis PWM MAX5094A/MAX5094C/MAX5095A Maximum Duty Cycle Minimum Duty Cycle SUPPLY CURRENT Startup Supply Current Operating Supply Current Zener Bias Voltage at VCC THERMAL SHUTDOWN Thermal Shutdown Thermal Shutdown Hysteresis SYNC Frequency Range SYNC Clock Input High Threshold SYNC Clock Input-Low Threshold SYNC Clock Input Minimum Pulse Width TSHDN THYST fSYNC VSYNCINH VSYNCINL tPW_SYNCIN 200 20 3.5 0.8 Junction temperature rising 150 4 1000 C C kHz V V ns ISTART ICC VZ VCC = 7.5V VFB = VCS = 0V ICC = 25mA 24 32 3 26.5 65 5 A mA V DMAX DMIN MAX5094B/MAX5094D/MAX5095B/ MAX5095C 94.5 48 96 49.8 97.5 50 0 % % VCC_START VCC_MIN UVLOHYST 7.98 7.1 8.4 7.6 0.8 8.82 8.0 V V V VRDS_ONL VRDS_ONH ISOURCE ISINK tR tF ISINK = 200mA ISOURCE = 100mA COUT = 10nF COUT = 10nF COUT = 1nF COUT = 1nF 4.5 3.5 2 1 15 22 12 9 A A ns ns VCS_MAX PSRR ICS tCS_DELAY MAX5094C/MAX5094D (Note 3) VCOMP = 5V, MAX5095_ 12V VCC 25V VCOMP = 0V 50mV overdrive 2.85 2.85 0.95 0.275 0.275 3 3 1 0.300 0.300 70 -1 60 -2.5 3.26 3.40 1.05 0.325 0.325 dB A ns V V/V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5094A/B/C/D/MAX5095A/B/C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)
_______________________________________________________________________________________
5
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10k, CT = 3.3nF, REF = open, CREF = 0.1F, COMP = open, VFB = 2V, CS = GND, TA = TJ = -40C to +125C, unless otherwise noted.) (Note 1)
PARAMETER SYNC Clock Output High Level SYNC Clock Output Low Level SYNC Leakage Current ADV_CLK (MAX5095C Only) ADV_CLK High Voltage ADV_CLK Low Voltage ADV_CLK Output Pulse Width ADV_CLK Rising Edge to OUT Rising Edge ADV_CLK Source and Sink Current VADV_CLKH VADV_CLKL tPULSE tADV_CLK IADV_CLK 10 IADV_CLK = 10mA source IADV_CLK = 10mA sink 85 110 2.4 3 0.4 V V ns ns mA SYMBOL VSYNCOH VSYNCOL ISYNC RSYNC = 5k VSYNC = 0V CONDITIONS 1mA external pulldown MIN 4.0 TYP 4.7 0 0.01 0.1 0.1 MAX UNITS V V A
Note 1: Note 2: Note 3: Note 4:
All devices are 100% tested at +25C. All limits over temperature are guaranteed by design, not production tested. Guaranteed by design, not production tested. Parameter measured at trip point of latch with VFB = 0 (MAX5094 only). Gain is defined as A = VCOMP / VCS, 0 VCS 0.8V for MAX5094A/MAX5094B, 0 VCS 0.2V for MAX5094C/MAX5094D/ MAX5095_. Note 5: Output frequency equals oscillator frequency for MAX5094A/MAX5094C/MAX5095A. Output frequency is one-half oscillator frequency for MAX5094B/MAX5094D/MAX5095B/MAX5095C.
Typical Operating Characteristics
(VCC = 15V, TA = +25C, unless otherwise noted.)
STARTUP CURRENT vs. TEMPERATURE
MAX5094/95 toc01 MAX5094/95 toc02
BOOTSTRAP UVLO vs. TEMPERATURE
10 9 8 7 VCC (V) 6 5 4 3 2 1 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 29 HYSTERESIS 27 25 VCC FALLING ICC (A) VCC RISING 41 39 37 35 33 31
OPERATING SUPPLY CURRENT vs. TEMPERATURE AFTER STARTUP (fOSC = fSW = 300kHz)
CT = 560pF 4.9 4.7 ICC (mA) 4.5 4.3 4.1 3.9 3.7 3.5 MAX5094A/MAX5094C/MAX5095A -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
MAX5094/95 toc03
5.1
VCC = 7.5V
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
6
_______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25C, unless otherwise noted.)
REFERENCE VOLTAGE vs. TEMPERATURE
MAX5094/95 toc04
REFERENCE VOLTAGE vs. REFERENCE LOAD CURRENT
MAX5094/95 toc05
REFERENCE VOLTAGE vs. SUPPLY VOLTAGE
4.998 4.996 4.994 VREF (V) 4.992 4.990 4.988 4.986 IREF = 1mA
MAX5094/95 toc06
5.08 5.06 5.04 5.02 VREF (V) 5.00 4.98 4.96 4.94 4.92 4.90 IREF = 20mA IREF = 1mA
5.05 5.00 4.95 VREF (V) 4.90 4.85 4.80 4.75 4.70
5.000
4.984 4.982 4.980 0 10 20 30 40 50 60 70 10 12 14 16 18 VCC (V) 20 22 24 26 IREF (mA)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
4.65
OSCILLATOR FREQUENCY (fOSC) vs. TEMPERATURE
MAX5094/95 toc07
OSCILLATOR RT/CT DISCHARGE CURRENT vs. TEMPERATURE
MAX5094/95 toc08
MAXIMUM DUTY CYCLE vs. TEMPERATURE
90 80 DUTY CYCLE (%) 70 60 50 40 30 20 10 0 RT = 5k CT = 560pF -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) MAX5094B/MAX5094D/MAX5095B/MAX5095C MAX5094A/MAX5094C/MAX5095A
MAX5094/95 toc09 MAX5094/95 toc11b
550 540 OSCILLATOR FREQUENCY (kHz) 530 520 510 500 490 480 470 460 450
RT/CT DISCHARGE CURRENT (mA)
RT = 3.65k CT = 560pF
8.04 VRT/CT = 2V 8.02 8.00 7.98 7.96 7.94 7.92 7.90 7.88
100
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
MAXIMUM DUTY CYCLE vs. FREQUENCY MAX5094A/MAX5094C/MAX5095A
MAX5094/95 toc10
CURRENT-SENSE TRIP THRESHOLD vs. TEMPERATURE
MAX5094A/MAX5094B
MAX5094/95 toc11a
CURRENT-SENSE TRIP THRESHOLD vs. TEMPERATURE
0.40 0.38 0.36 CS THRESHOLD (V) 0.34 0.32 0.30 0.28 0.26 0.24 MAX5094C/D: VFB = 0V MAX5095_: VCOMP = 5V
100 90 80 DUTY CYCLE (%) 70 60 50 40 30 20 10 0 0 CT = 1000pF CT = 560pF CT = 220pF CT = 100pF
1.10 1.08 1.06 CS THRESHOLD (V) 1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.90
VFB = 0V -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
0.22 0.20 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
500 1000 1500 2000 2500 3000 3500 4000 OSCILLATOR FREQUENCY (kHz)
_______________________________________________________________________________________
7
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25C, unless otherwise noted.)
TIMING RESISTANCE vs. OSCILLATOR FREQUENCY
MAX5094/95 toc12
OUT IMPEDANCE vs. TEMPERATURE (RDS_ON PMOS DRIVER)
5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0
MAX5094/95 toc13
OUT IMPEDANCE vs. TEMPERATURE (RDS_ON NMOS DRIVER)
9 8 7 RDS_ON () 6 5 4 3 2 1 0 ISINK = 200mA
MAX5094/95 toc14
1000 CT = 1nF 100 RT (k) CT = 560pF CT = 220pF 10 CT = 10nF CT = 4.7nF CT = 3.3nF CT = 2.2nF 100,000 1,000,000 CT = 100pF
ISOURCE = 100mA
10
1
0.1 10,000
RDS_ON ()
10,000,000
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
FREQUENCY (Hz)
PROPAGATION DELAY FROM CURRENT-LIMIT COMPARATOR TO OUT vs. TEMPERATURE
MAX5094/95 toc15
ERROR-AMPLIFIER OPEN-LOOP GAIN AND PHASE vs. FREQUENCY
MAX5094/95 toc16
COMP VOLTAGE LEVEL TO TURN OFF DEVICE vs. TEMPERATURE
10 -15 2.2 PHASE (DEGREES) 2.1 VCOMP (V) 2.0 1.9 1.8 1.7 1.6 1.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) VCC = 15V
MAX5094/95 toc17
100 90 PROPAGATION DELAY (ns) 80 70
2.3
140 120 100 GAIN (dB) 80 60 40 20 0 PHASE GAIN
-40 -65 -90 -115 -140 -165 -190 10k 100k 1M 10M 100M
60 50 40 30 20 10 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-20 0.01 1 10 100 1k
FREQUENCY (Hz)
ADV_CLK RISING EDGE TO OUT RISING EDGE TIME vs. TEMPERATURE
MAX5094/95 toc18
ADV_CLK AND OUT WAVEFORMS
MAX5094/95 toc19
120 118 116 114 TIME (ns) 112 110 108 106 104 102 100 MAX5095C
VCC = 15V MAX5095C ADV_CLK 5V/div LOAD = 4.75k
OUT 10V/div
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
t = 20ns/div
8
_______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25C, unless otherwise noted.)
OUT SOURCE AND SINK CURRENTS
MAX5094/95 toc20
SUPPLY CURRENT vs. OSCILLATOR FREQUENCY
MAX5094/95 toc21
MAXIMUM DUTY CYCLE vs. RT MAX5094A/MAX5095A
90 80 DUTY CYCLE (%) 70 60 50 40 30 20 CT = 100nF CT = 1000pF CT = 560pF CT = 220pF
MAX5094/95 toc22
VCC = 15V COUT = 10nF
7.0 VOUT 10V/div 6.5 6.0 5.5 ICC (mA) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 TA = +125C TA = -40C MAX5095C CT = 100pF
100
IOUT 4A/div
t = 400ns/div
20 120 220 320 420 520 620 720 820 920 1020 FREQUENCY (kHz)
100
1000 RT ()
10,000
100,000
Pin Descriptions
MAX5094_
PIN 1 2 3 4 5 6 7 8 NAME COMP FB CS RT/CT GND OUT VCC REF Error-Amplifier Inverting Input PWM Comparator and Overcurrent Protection Comparator Input. The current-sense signal is compared to a signal proportional to the error-amplifier output voltage. Timing Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT from RT/CT to GND set the oscillator frequency. Power-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to minimize ground loops. MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET. Power-Supply Input. Bypass VCC to GND with a 0.1F ceramic capacitor or a parallel combination of a 0.1F and a higher value ceramic capacitor. 5V Reference Output. Bypass REF to GND with a 0.1F ceramic capacitor or a parallel combination of a 0.1F and a higher value ceramic capacitor no larger then 4.7F. FUNCTION Error-Amplifier Output. COMP can be used for soft-start.
_______________________________________________________________________________________
9
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Pin Descriptions (continued)
MAX5095_
PIN MAX5095A/ MAX5095B 1 MAX5095C NAME FUNCTION Current Limit/PWM Comparator Input. COMP is level-shifted and connected to the inverting input of the PWM comparator. Pull up COMP to REF through a resistor and connect an optocoupler from COMP to GND for proper operation. Bidirectional Synchronization Input. When synchronizing with other MAX5095A/MAX5095Bs, the higher frequency part synchronizes all other devices. Advance Clock Output. ADV_CLK is an 85ns clock output pulse preceding the rising edge of OUT (see Figure 4). Use the pulse to drive the secondary-side synchronous rectifiers through a pulse transformer or an optocoupler (see Figure 8). PWM Comparator/Overcurrent Protection Comparator Input. The current-sense signal is compared to the level shifted voltage at COMP. Timing Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT from RT/CT to GND set the oscillator frequency. Power-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to minimize ground loops. MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET. Power-Supply Input. Bypass VCC to GND with a 0.1F ceramic capacitor or a parallel combination of a 0.1F and a higher value ceramic capacitor. 5V Reference Output. Bypass REF to GND with a 0.1F ceramic capacitor or a parallel combination of a 0.1F and a higher value ceramic capacitor no larger than 4.7F.
1
COMP
2
--
SYNC
--
2
ADV_CLK
3 4 5 6 7 8
3 4 5 6 7 8
CS RT/CT GND OUT VCC REF
10
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
VP
MAX5094_
2.5V REFERENCE 2.5V 2.5V THERMAL SHUTDOWN PREREGULATOR 5V
UVLO
8.4V/7.6V
VOLTAGEDIVIDER
7 VCC 26.5V VDD 8 REF
EN-REF
BG 5V REGULATOR SNS EN-DRV-BAR REG_OK DELAY VP VOLTAGEDIVIDER
1V (MAX5094A/B) 0.3V (MAX5094C/D) ILIM S CLK R CS 3 CPWM GND 5 VEA FB 2 COMP 1 R 100% MAX DUTY CYCLE (MAX5094A/MAX5094C) 50% MAX DUTY CYCLE (MAX5094B/MAX5094D) 2R OSC Q 4 RT/CT Q 6 OUT
Figure 1. MAX5094_ Functional Diagram
Detailed Description
The MAX5094_/MAX5095_ current-mode PWM controllers are designed for use as the control and regulation core of flyback or forward topology switching power supplies. These devices incorporate an integrated low-side driver, adjustable oscillator, error amplifier (MAX5094_ only), current-sense amplifier, 5V reference, and external synchronization capability (MAX5095A/MAX5095B only). An internal +26.5V current-limited VCC clamp prevents overvoltage during startup. Eight different versions of the MAX5094/MAX5095 are available as shown in the Selector Guide. The MAX5094A/MAX5094B are the standard versions with a
feedback input (FB) and internal error amplifier. The MAX5095A/MAX5095B include bidirectional synchronization (SYNC). This enables multiple MAX5095A/ MAX5095Bs to be connected and synchronized to the device with the highest frequency. The MAX5095C includes an ADV_CLK output, which precedes the MAX5095C's drive output (OUT) by 110ns. Figures 1, 2, and 3 show the internal functional diagrams of the MAX5094_, MAX5095A/MAX5095B, and MAX5095C, respectively. The MAX5094A/MAX5094C/MAX5095A are capable of 100% maximum duty cycle. The MAX5094B/ MAX5094D/MAX5095B/MAX5095C limit the maximum duty cycle to 50%.
______________________________________________________________________________________
11
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
VP
MAX5095A MAX5095B
2.5V REFERENCE 2.5V 2.5V THERMAL SHUTDOWN PREREGULATOR 5V
UVLO
8.4V/7.6V
VOLTAGEDIVIDER
7 VCC 26.5V VDD 8 REF
EN-REF
BG 5V REGULATOR SNS EN-DRV-BAR REG_OK DELAY VP VOLTAGEDIVIDER
0.3V ILIM S CLK R CS 3 GND 5 2R COMP 1 R CPWM OSC Q 100% MAX DUTY CYCLE (MAX5095A) 50% MAX DUTY CYCLE (MAX5095B) Q 6 OUT
4 RT/CT
SYNC 2
BIDIRECTIONAL SYNC
Figure 2. MAX5095A/B Functional Diagram
Current-Mode Control Loop
The advantages of current-mode control over voltagemode control are twofold. First, there is the feed-forward characteristic brought on by the controller's ability to adjust for variations in the input voltage on a cycle-bycycle basis. Secondly, the stability requirements of the current-mode controller are reduced to that of a singlepole system unlike the double pole in the voltage-mode control scheme.
The MAX5094/MAX5095 use a current-mode control loop where the output of the error amplifier is compared to the current-sense voltage (VCS). When the current-sense signal is lower than the inverting input of the CPWM comparator, the output of the comparator is low and the switch is turned on at each clock pulse. When the current-sense signal is higher than the inverting input of the CPWM comparator, the output is high and the switch is turned off.
12
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
VP
MAX5095C
2.5V REFERENCE 2.5V 2.5V THERMAL SHUTDOWN PREREGULATOR 5V
UVLO
8.4V/7.6V
VOLTAGEDIVIDER
7 VCC 26.5V VDD 8 REF
EN-REF
BG 5V REGULATOR SNS EN-DRV-BAR REG_OK DELAY VP VOLTAGEDIVIDER
0.3V ILIM S CLK R CS 3 GND 5 2R COMP 1 R 4 RT/CT CPWM OSC Q 50% MAX DUTY CYCLE Q 6 OUT
ADV_CLK 2
Figure 3. MAX5095C Functional Diagram
VCC and Startup
In normal operation, VCC is derived from a tertiary winding of the transformer. However, at startup there is no energy delivered through the transformer, thus a resistor must be connected from VCC to the input power source (see RST and CST in Figures 5 to 8). During startup, CST charges up through RST. The 5V reference generator, comparator, error amplifier, oscillator, and drive circuit remain off during UVLO to reduce startup current below 65A. When V CC reaches the undervoltage-lockout threshold of 8.4V, the output driver begins to switch and the tertiary winding supplies power to VCC. VCC has an internal 26.5V current-limited clamp at its input to protect the device from overvoltage during startup.
Size the startup resistor, RST, to supply both the maximum startup bias (ISTART) of the device (65A max) and the charging current for CST. The startup capacitor CST must charge to 8.4V within the desired time period t ST (for example, 500ms). The size of the startup capacitor depends on: 1) IC operating supply current at a programmed oscillator frequency (fOSC). 2) The time required for the bias voltage, derived from a bias winding, to go from 0 to 9V. 3) The MOSFET total gate charge. 4) The operating frequency of the converter (fSW).
______________________________________________________________________________________
13
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
To calculate the capacitance required, use the following formula: CST = where: IG = QG fSW ICC is the MAX5094/MAX5095s' maximum internal supply current after startup (see the Typical Operating Characteristics to find the IIN at a given fOSC). QG is the total gate charge for the MOSFET, fSW is the converter switching frequency, VHYST is the bootstrap UVLO hysteresis (0.8V), and tSS is the soft-start time, which is set by external circuitry. Size the resistor RST according to the desired startup time period, tST, for the calculated CST. Use the following equations to calculate the average charging current (ICST) and the startup resistor (RST): V x CST ICST = SUVR t ST The minimum discharge time of CST from 8.4V to 7.6V must be greater than the soft-start time (tSS).
[ICC + IG ](tSS )
VHYST
Undervoltage Lockout (UVLO)
The minimum turn-on supply voltage for the MAX5094/MAX5095 is 8.4V. Once VCC reaches 8.4V, the reference powers up. There is 0.8V of hysteresis from the minimum turn-on voltage to the UVLO threshold. Once VCC reaches 8.4V, the MAX5094/MAX5095 operates with VCC down to 7.6V. Once VCC goes below 7.6V the device is in UVLO. When in UVLO, the quiescent supply current into VCC falls back to 32A (typ), and OUT and REF are pulled low.
MOSFET Driver
OUT drives an external n-channel MOSFET and swings from GND to VCC. Ensure that VCC remains below the absolute maximum VGS rating of the external MOSFET. OUT is a push-pull output with the on-resistance of the PMOS typically 3.5 and the on-resistance of the NMOS typically 4.5. The driver can source 2A typically and sink 1A typically. This allows for the MAX5094/MAX5095 to quickly turn on and off high gate-charge MOSFETs. Bypass VCC with one or more 0.1F ceramic capacitors to GND, placed close to the MAX5094/MAX5095. The average current sourced to drive the external MOSFET depends on the total gate charge (QG) and operating frequency of the converter. The power dissipation in the MAX5094/MAX5095 is a function of the average outputdrive current (IDRIVE). Use the following equation to calculate the power dissipation in the device due to IDRIVE: IDRIVE = QG x fSW PD = (IDRIVE + ICC) x VCC where, ICC is the operating supply current. See the Typical Operating Characteristics for the operating supply current at a given frequency.
VSUVR VINMIN - 2 RST ICST + ISTART Where VINMIN is the minimum input supply voltage for the application (36V for telecom), VSUVR is the bootstrap UVLO wake-up level (8.4V), and ISTART is the VIN supply current at startup (65A, max). Choose a higher value for RST than the one calculated above if longer startup times can be tolerated to minimize power loss in RST. The equation for CST above gives a good approximation of CST, yet neglects the current through RST. Fine tune CST using: V - 8V ICC + IG - INMIN RST CST = (t SS ) VHYST The above startup method is applicable to circuits where the tertiary winding has the same phase as the output windings. Thus, the voltage on the tertiary winding at any given time is proportional to the output voltage and goes through the same soft-start period as the output voltage.
Error Amplifier (MAX5094)
The MAX5094 includes an internal error amplifier. The inverting input is at FB and the noninverting input is internally connected to a 2.5V reference. The internal error amplifier is useful for nonisolated converter design (see Figure 6) and isolated design with primary-side regulation through a bias winding (see Figure 5). In the case of a nonisolated power supply, the output voltage is: R1 VOUT = 1 + x 2.5V R2 where, R1 and R2 are from Figure 6.
14
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers
MAX5095_Feedback
The MAX5095A/MAX5095B/MAX5095C use either an external error amplifier when designed into a nonisolated converter or an error amplifier and optocoupler when designed into an isolated power supply. The COMP input is level-shifted and connected to the inverting terminal of the PWM comparator (CPWM). Connect the COMP input to the output of the external error amplifier for nonisolated design. Pull COMP high externally to 5V (or REF) and connect the optocoupler transistor as shown in Figures 7 and 8. COMP can be used for soft-start and also as a shutdown. See the Typical Operating Characteristics to find the turn-off COMP voltage at different temperatures.
Reference Output
REF is a 5V reference output that can source 20mA. Bypass REF to GND with a 0.1F capacitor.
MAX5094A/B/C/D/MAX5095A/B/C
Current Limit
The MAX5094/MAX5095 include a fast current-limit comparator to terminate the ON cycle during an overload or a fault condition. The current-sense resistor (RCS), connected between the source of the MOSFET and GND, sets the current limit. The CS input has a voltage trip level (V CS ) of 1V (MAX5094A/B) or 0.3V (MAX5094C/D, MAX5095_). Use the following equation to calculate RCS: V RCS = CS IP-P IP-P is the peak current in the primary that flows through the MOSFET. When the voltage produced by this current (through the current-sense resistor) exceeds the currentlimit comparator threshold, the MOSFET driver (OUT) will turn the switch off within 60ns. In most cases, a small RC filter is required to filter out the leading-edge spike on the sense waveform. Set the time constant of the RC filter at 50ns. Use a current transformer to limit the losses in the current-sense resistor and achieve higher efficiency especially at low input-voltage operation.
Oscillator
The oscillator frequency is programmed by adding an external capacitor and resistor at RT/CT (see RT and CT in the Typical Application Circuits). RT is connected from RT/CT to the 5V reference (REF) and CT is connected from RT/CT to GND. REF charges CT through RT until its voltage reaches 2.8V. CT then discharges through an 8.3mA internal current sink until CT's voltage reaches 1.1V, at which time C T is allowed to charge through RT again. The oscillator's period will be the sum of the charge and discharge times of CT. Calculate the charge time as tC = 0.57 x RT x CT The discharge time is then tD = RT x CT x 103 4.88 x RT - 1.8 x 103
Synchronization (MAX5095A/MAX5095B)
SYNC SYNC is a bidirectional input/output that outputs a synchronizing pulse and accepts a synchronizing pulse from other MAX5095A/MAX5095Bs (see Figures 7 and 9). As an output, SYNC is an open-drain p-channel MOSFET driven from the internal oscillator and requires an external pulldown resistor (RSYNC) between 500 and 5k. As an input, SYNC accepts the output pulses from other MAX5095A/MAX5095Bs. Synchronize multiple MAX5095A/MAX5095Bs by connecting their SYNC pins together. All devices connected together will synchronize to the one operating at the highest frequency. The rising edge of SYNC will precede the rising edge of OUT by approximately the discharge time (tD) of the oscillator (see the Oscillator section). The pulse width of the SYNC output is equal to the time required to discharge the stray capacitance at SYNC through RSYNC plus the CT discharge time tD. Adjust RT/CT such that the minimum discharge time tD is 200ns.
The oscillator frequency will then be fOSC = 1 t C + tD
For the MAX5094A/MAX5094C/MAX5095A, the converter output switching frequency (fSW) is the same as the oscillator frequency (f OSC ). For the MAX5094B/ MAX5094D/MAX5095B/MAX5095C, the output switching frequency is 1/2 the oscillator frequency.
______________________________________________________________________________________
15
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Advance Clock Output (ADV_CLK) (MAX5095C) ADV_CLK is an advanced pulse output provided to facilitate the easy implementation of secondary-side synchronous rectification using the MAX5095C. The ADV_CLK pulse width is 85ns (typically) with its rising edge leading the rising edge of OUT by 110ns. Use this leading pulse to turn off the secondary-side synchronous-rectifier MOSFET (QS) before the voltage appears on the secondary (see Figure 8). Turning off the secondary-side synchronous MOSFET earlier avoids the shorting of the secondary in the forward converter. The ADV_CLK pulse can be propagated to the secondary side using a pulse transformer or highspeed optocoupler. The 85ns pulse, with 3V drive voltage (10mA source), significantly reduces the volt-second requirement of the pulse transformer and the advanced pulse alleviates the need for a highspeed optocoupler.
RT/CT
OUT
tADV_CLK = 110ns ADV_CLK
tPULSE = 85ns
Figure 4. ADV_CLK
Thermal Shutdown
When the MAX5094/MAX5095's die temperature goes above +150C, the thermal shutdown circuitry will shut down the 5V reference and pull OUT low.
Typical Application Circuits
VIN RST
CST 1 2 3 4 CT RCS COMP FB CS RT/CT REF 8 7 6 5
VOUT
R1
MAX5094_ VCC
OUT GND
R2
RT
N
Figure 5. MAX5094_ Typical Application Circuit (Isolated Flyback with Primary-Side Regulation)
16
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers
Typical Application Circuits (continued)
VIN RST
MAX5094A/B/C/D/MAX5095A/B/C
CST 1 2 3 4 CT RCS COMP FB CS RT/CT REF 8 7 6 5 N
VOUT
R1
MAX5094_ VCC
OUT GND
R2
RT
Figure 6. MAX5094_ Typical Application Circuit (Nonisolated Flyback)
VIN RST SYNC INPUT/OUTPUT CST RSYNC 1 2 3 4 CT RCS COMP SYNC MAX5095A REF VCC OUT GND 8 7 6 5 N VOUT
MAX5095B
CS RT/CT
RT
Figure 7. MAX5095A/MAX5095B Typical Application Circuit (Isolated Flyback) ______________________________________________________________________________________ 17
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Typical Application Circuits (continued)
VD
VIN RST N QS N
VOUT
CST
QR VCC REF RT RT/CT CT RCS COMP GND ADV_CLK OUT N
VD
MAX5095C
CS
MAX5078
0.5V/s PULSE TRANSFORMER
Figure 8. MAX5095C Typical Application Circuit (Isolated Forward with Secondary-Side Synchronous Rectification)
18
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
VIN VIN VIN
VCC REF RT RT/CT CT OUT N RT CS CT RT/CT REF
VCC OUT N RT CS CT RT/CT REF
VCC OUT N
MAX5095A MAX5095B
MAX5095A MAX5095B
MAX5095A MAX5095B
CS
SYNC GND
SYNC GND
SYNC GND
TO OTHER MAX5095A/Bs RSYNC
Figure 9. Synchronization of MAX5095A/MAX5095B
______________________________________________________________________________________
19
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Selector Guide
PART MAX5094AASA MAX5094AAUA MAX5094BASA MAX5094BAUA MAX5094CASA MAX5094CAUA MAX5094DAUA MAX5095AAUA MAX5095BAUA MAX5095CAUA FEATURE Feedback Feedback Feedback Feedback Feedback Feedback Feedback Sync Sync ADV_CLK UVLO THRESHOLD (V) 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 CS THRESHOLD (V) 1 1 1 1 0.3 0.3 0.3 0.3 0.3 0.3 MAX DUTY CYCLE (%) 100 100 50 50 100 100 50 100 50 50 COMPETITORS PART NUMBER UCC28C43 2nd source UCC28C43 2nd source UCC28C45 2nd source UCC28C45 2nd source Improved UCC28C43 Improved UCC28C43 Improved UCC28C45 Improved UCC28C43 Improved UCC28C45 Improved UCC28C45 PINPACKAGE 8 SO 8 MAX 8 SO 8 MAX 8 SO 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX
Pin Configurations (continued)
TOP VIEW
COMP 1 SYNC CS 2 3 8 7 REF VCC OUT GND COMP 1 ADV_CLK 2 8 7 REF VCC OUT GND
MAX5095A MAX5095B
MAX5095C
6 5 CS 3 6 5 RT/CT 4
RT/CT 4
MAX
MAX
Ordering Information (continued)
PART MAX5094CASA* MAX5094CASA+ MAX5094CAUA* MAX5094CAUA+ MAX5094DAUA* MAX5094DAUA+ MAX5095AAUA MAX5095AAUA+* MAX5095BAUA* MAX5095BAUA+ MAX5095CAUA* MAX5095CAUA+ TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 8 SO 8 SO 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX PKG CODE S8-4 S8-4 U8-1 U8-1 U8-1 U8-1 U8-1 U8-1 U8-1 U8-1 U8-1 U8-1
Chip Information
TRANSISTOR COUNT: 1987 PROCESS: BiCMOS
+Denotes lead-free package. *Future product--contact factory for availability. 20 ______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode PWM Controllers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
SOICN .EPS
MAX5094A/B/C/D/MAX5095A/B/C
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D A e B A1 L C
0-8
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
______________________________________________________________________________________
21
High-Performance, Single-Ended, Current-Mode PWM Controllers MAX5094A/B/C/D/MAX5095A/B/C
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
8LUMAXD.EPS
8
4X S
8
INCHES DIM A A1 A2 b c D e E H MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
O0.500.1 0.60.1
E
H
1
0.60.1
1
D
L
S
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
e
c b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
J
1 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

▲Up To Search▲

Price & Availability of MAX5094AASA

	To Download MAX5094AASA Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .