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19-3257; Rev 0; 4/04
KIT ATION EVALU E AILABL AV
4A Ultra-Low-Input-Voltage LDO Regulators
General Description Features
1.425V to 3.6V Input Voltage Range Guaranteed 4A Output Current 1% Output Accuracy Over Load/Line/ Temperature 100mV Dropout at 4A Load (typ) Built-In Soft-Start 800A (typ) Operating Supply Current 150A (max) Shutdown Supply Current Short-Circuit Current Foldback Protection Thermal-Overload Protection 10% Power-OK (MAX8556) 140ms Power-On Reset Output (MAX8557)
MAX8556/MAX8557
The MAX8556/MAX8557 low-dropout linear regulators operate from input voltages as low as 1.425V and are able to deliver up to 4A of continuous output current with a typical dropout voltage of only 100mV. The output voltage is adjustable from 0.5V to VIN - 0.2V. Designed with an internal p-channel MOSFET pass transistor, the MAX8556/MAX8557 maintain a low 800A typical supply current, independent of the load current and dropout voltage. Using a p-channel MOSFET eliminates the need for an additional external supply or a noisy internal charge pump. Other features include a logic-controlled shutdown mode, built-in soft-start, short-circuit protection with foldback current limit, and thermal-overload protection. The MAX8556 features a POK output that transitions high when the regulator output is within 10% of its nominal output voltage. The MAX8557 offers a power-on reset output that transitions high 140ms after the output has achieved 90% of its nominal output voltage. The MAX8556/MAX8557 are available in a 16-pin thin QFN 5mm x 5mm package with exposed paddle.
Fast Transient Response 16-Pin Thin QFN 5mm x 5mm Package
Applications
Servers and Storage Devices Networking Base Stations Optical Modules Point-of-Load Supplies ATE
MAX8557ETE PART MAX8556ETE
Ordering Information
TEMP RANGE -40C to +85C -40C to +85C PINPACKAGE 16 Thin QFN 5mm X 5mm 16 Thin QFN 5mm X 5mm FEATURE POK POR
Typical Operating Circuit
TOP VIEW
Pin Configuration
GND 14
EN
N.C.
VIN 1.425V TO 3.6V IN OUT
VOUT 0.5V TO VIN - 0.2V
16 IN 1 2 3 4 5
IN
15
13 12 11 POK (POR) OUT OUT OUT
MAX8556 (MAX8557) EN FB
IN IN IN
MAX8556 (MAX8557)
FB 10 9 8 OUT
N.C.
THIN QFN 5mm x 5mm
________________________________________________________________ Maxim Integrated Products
OUT
IN
POK (POR)
6
7
GND
1
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.
4A Ultra-Low-Input-Voltage LDO Regulators MAX8556/MAX8557
ABSOLUTE MAXIMUM RATINGS
IN, EN, POK, POR to GND .......................................-0.3V to +4V FB, OUT to GND ..........................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70C) 16-Pin Thin QFN (derate 33.3mW/C above +70C) (Note 1)............................................2666.7mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 standards.
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
(VEN = VIN = 1.8V, VOUT = 1.5V, IOUT = 2mA, TA = -40C to +85C, typical values are at TA = +25C, unless otherwise noted. Note 2)
PARAMETER IN Input Voltage Range Input Undervoltage Lockout OUT Output Voltage Range Load Regulation Line Regulation Dropout Voltage Regulated Output-Voltage Current Limit Load Capacitance FB FB Threshold Accuracy (Note 3) FB Input Bias Current GND GND Supply Current GND Shutdown Current POK FB Power-OK Fault Threshold POK Output Voltage, Low FB moving out of regulation, VIN = 1.425V to 3.6V, 10mV hysteresis VFB = 0.4V or 0.6V, IPOK = 2mA FB high FB low 540 440 550 450 25 560 460 200 mV mV VIN = 1.425V to 3.6V, VOUT = 1.225V Dropout, VIN = 3.6V, VFB = 480mV VIN = 3.6V, EN = GND 800 1000 1600 2000 150 A A VOUT = 1.225V to 3V, VIN = VOUT + 0.2V to 3.6V, IOUT = 2mA to 4A VFB = 0.5V, VIN = 3.6V 495 500 0.001 505 1 mV A IOUT = 2mA to 4A VIN = 1.425V to 3.6V, VOUT = 1.225V VIN = 1.425V, IOUT = 4A, VFB = 480mV VIN = 3.6V, VOUT = 3V, VFB = 460mV ESR < 50mA 5 16 -0.15 0.5 0.1 0 100 7 +0.15 200 9 120 3.4 V %/A %/V mV A F VIN rising, 70mV hysteresis VIN falling 1.425 1.30 1.23 1.35 1.28 3.600 1.40 1.33 V V CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
4A Ultra-Low-Input-Voltage LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(VEN = VIN = 1.8V, VOUT = 1.5V, IOUT = 2mA, TA = -40C to +85C, typical values are at TA = +25C, unless otherwise noted. Note 2)
PARAMETER POK Output Current, High POK Delay Time EN Enable Input Threshold Enable Input Bias Current THERMAL SHUTDOWN Thermal-Shutdown Threshold POR FB Power-On Reset Fault Threshold POR Output Voltage, Low POR Output Current, High POR Rising Delay Time SOFT-START Soft-Start Time 100 s FB falling, VIN = 1.425V to 3.6V, 10mV hysteresis VFB = 0.4V, IPOR = 2mA VPOR = 3.6V, VFB = 0.5V FB rising to POR high impedance 100 440 450 25 0.001 140 460 200 1 200 mV mV A ms Output on and off TJ rising TJ falling +160 +115 C VIN = 1.425V to 3.6V VEN = 0V or 3.6V EN rising EN falling 0.4 -1 +1 1.25 V A CONDITIONS VPOK = 3.6V VFB = 0.5 From FB rising to POK high 25 MIN TYP 0.001 50 MAX 1 100 UNITS A s
MAX8556/MAX8557
Note 2: Specifications to -40C are guaranteed by design and not production tested. Note 3: Minimum supply voltage for output accuracy must be at least 1.425V.
Typical Operating Characteristics
(VEN = VIN = +1.8V, VOUT = +1.5V, IOUT = 4A, COUT = 20F, CIN = 20F, and TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8556 toc01
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8556 toc02
GND CURRENT vs. INPUT VOLTAGE
900 800 GND CURRENT (A) 700 600 500 400 300 200 ILOAD = 0A ILOAD = 2A ILOAD = 4A
MAX8556 toc03
1.55 TA = -85C 1.50 OUTPUT VOLTAGE (V) TA = -25C TA = -40C 1.45
1.5025 1.5020 1.5015 OUTPUT VOLTAGE (V) 1.5010 1.5005 1.5000 1.4995 1.4990 1.4985 TA = -40C TA = +85C TA = +25C
1000
1.40
1.35 ILOAD = 2A 1.30 1.2 1.8 2.4 INPUT VOLTAGE (V) 3.0 3.6
1.4980 1.4975 0
100 0 2 3 4 0 1.2 2.4 3.6
1
LOAD CURRENT (A)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
4A Ultra-Low-Input-Voltage LDO Regulators MAX8556/MAX8557
Typical Operating Characteristics (continued)
(VEN = VIN = +1.8V, VOUT = +1.5V, IOUT = 4A, COUT = 20F, CIN = 20F, and TA = +25C, unless otherwise noted.)
GND CURRENT vs. TEMPERATURE
MAX8556 toc04
DROPOUT VOLTAGE vs. LOAD CURRENT
80 DROPOUT VOLTAGE (mV) 70 60 50 40 30 20 10 0 VIN = 1.5V 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 VOUT (AC-COUPLED)
MAX8556 toc05
LINE-TRANSIENT RESPONSE
MAX8556 toc06
900 800 700 GND CURRENT (A) 600 500 400 300 200 100 0 -40 -15 10 35 60 ILOAD = 0A ILOAD = 2A
90
2.5V VIN 1.8V
10mV/div
85
100s/div
TEMPERATURE (C)
LOAD CURRENT (A)
4A LOAD-TRANSIENT RESPONSE
MAX8556 toc07
2A LOAD-TRANSIENT RESPONSE
MAX8556 toc08
VOUT (AC-COUPLED)
50mV/div
VOUT (AC-COUPLED)
50mV/div
IOUT
2A/div
IOUT
1A/div
40s/div
40s/div
ENABLE WAVEFORMS
MAX8556 toc09
SHORT-CIRCUIT WAVEFORMS
MAX8556 toc10
VIN 3.6V VEN 2V/div VOUT
2V/div
1V/div
VOUT
1V/div IOUT 5A/div
100s/div
200s/div
4
_______________________________________________________________________________________
4A Ultra-Low-Input-Voltage LDO Regulators MAX8556/MAX8557
Typical Operating Characteristics (continued)
(VEN = VIN = +1.8V, VOUT = +1.5V, IOUT = 4A, COUT = 20F, CIN = 20F, and TA = +25C, unless otherwise noted.)
PSRR vs. FREQUENCY
80 70 60 PSRR (dB) 50 40 30 20 10 0 1 10 100 1000 100s/div FREQUENCY (kHz) VIN = 2.5V ILOAD = 1A VOUT 1V/div IIN
MAX8556 toc11
STARTUP WAVEFORMS
MAX8556 toc12
90
2V/div VIN
2A/div
EXPOSED PADDLE TEMPERATURE vs. AMBIENT TEMPERATURE
EXPOSED PADDLE TEMPERATURE (C) 90 80 70 FB (V) 60 50 40 30 20 10 0 0 17 34 51 68 85 AMBIENT TEMPERATURE (C) DATA TAKEN USING MAX8556 EVALUATION KIT 0.490 -40 0.495
MAX8556 toc13
FB REGULATION vs. TEMPERATURE
MAX8556 toc14
100
0.510
0.505
0.500
ILOAD = 50mA -15 10 35 60 85
TEMPERATURE (C)
FOLDBACK CURRENT-LIMIT WAVEFORMS
MAX8556 toc15
CURRENT-LIMIT THRESHOLD vs. TEMPERATURE
7.8 CURRENT-LIMIT THRESHOLD (A)
MAX8556 toc16
8.0
VOUT
7.6 7.4 7.2 7.0 6.8 6.6 6.4 6.2 6.0
500mV/div
IOUT
5A/div
100s/div
-40
-15
10
35
60
85
TEMPERATURE (C)
_______________________________________________________________________________________
5
4A Ultra-Low-Input-Voltage LDO Regulators MAX8556/MAX8557
Pin Description
PIN 1-6 7-11 NAME IN OUT POK (MAX8556) 12 POR (MAX8557) 13 14 15 16 EP FB GND N.C. EN -- Power-On Reset. Open-drain output goes high impedance 140ms after the output is above 90% of its nominal regulation voltage. POR pulls low immediately after an output fault or when EN is low. Connect a resistor from POR to a logic supply of less than 3.6V. Feedback Input. VFB is regulated to 0.5V. Connect to the center tap of a resistor-divider from output to GND to set the desired output voltage. Ground Connect to GND or Floating Enable Input. Connect to GND or a logic low to shut down the device. Connect to IN or a logic high for normal operation. Exposed Paddle. Connect to GND and to a ground plane for heatsinking. FUNCTION LDO Input. Connect to a 1.425V to 3.6V input voltage. Bypass with a 22F ceramic capacitor to GND. LDO Output. Bypass with 2 x 10F ceramic capacitors to GND. A smaller capacitance can be used if the maximum load current is less than 4A. Power-OK Output. Open-drain output that pulls low when VOUT is outside 10% of the expected regulation voltage or when EN is low. POK is high impedance when VOUT is within 10% of the nominal output voltage. Connect a resistor from POK to a logic supply of less than 3.6V.
Block Diagram
IN THRESHOLD
THERMALOVERLOAD PROTECTION REF
0.50V 0.45V 0.55V
UNDERVOLTAGE LOCKOUT
ERROR AMP
P
EN
SHUTDOWN LOGIC
CURRENTLIMIT COMPARATOR
OUT
FB POK (POR)
MAX8556 (MAX8557)
POK (POR) CIRCUITRY
N
GND
6
_______________________________________________________________________________________
4A Ultra-Low-Input-Voltage LDO Regulators
Detailed Description
The MAX8556/MAX8557 low-dropout linear regulators are capable of delivering up to 4A from low-input voltage supplies ranging from 1.425V to 3.6V with only 200mV of dropout (max). The PMOS output stage can be driven from input voltages down to 1.425V without sacrificing stability or transient performance. Supply current is not a significant function of load or input headroom because this regulator has a PMOS output device. The MAX8556/MAX8557 are fully protected from an output short circuit by current-limiting and thermal-overload circuitry. The low-power shutdown mode reduces supply current to 0.2A (typ) to maximize battery life in portable applications. The MAX8556 includes an opendrain power-OK signal (POK) that goes high when the regulator output is within 10% of its nominal output voltage. The MAX8557 includes an open-drain poweron-reset output (POR) that goes high 140ms after the output has risen above 90% of its nominal value.
Shutdown Mode
The MAX8556/MAX8557 feature a low-power shutdown mode that reduces quiescent current to 0.2A (typ). Drive EN low to disable the voltage reference, error amplifier, gate-drive circuitry, and pass transistor, and pull the output low with 5k impedance. Drive EN high or connect to IN for normal operation.
MAX8556/MAX8557
Power-OK Output (POK, MAX8556 Only)
The MAX8556 features a power-OK (POK) output to indicate the status of the output. POK is high impedance when the regulator output is within 10% of its nominal output voltage. If the output voltage falls/rises outside this range or the IC experiences thermal fault, POK is internally pulled low. This open-drain output requires an external pullup resistor to VIN or another logic supply below 3.6V. For glitch immunity, an internal delay circuit prevents the output from switching for 50s (typ) after the trip threshold is initially reached. POK is low when the IC is in shutdown mode.
Internal P-Channel Pass Transistor
The MAX8556/MAX8557 feature a 25m p-channel MOSFET pass transistor. Unlike similar designs using pnp pass transistors, p-channel MOSFETs require no base drive, which reduces quiescent current; pnpbased regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX8556/MAX8557 do not suffer from these problems and consume only 800A (typ) of quiescent current under heavy loads, as well as in dropout.
Power-On Reset (POR, MAX8557 Only)
The MAX8557 features a power-on reset output that goes high impedance 140ms (typ) after the output reaches 90% of its nominal value. This open-drain output requires an external pullup resistor to VIN or another logic supply less than 3.6V. When the output falls below 90% of the nominal output voltage or the IC experiences a thermal fault, POR immediately transitions low. POR is low when the IC is in shutdown mode.
Operating Region and Power Dissipation
The maximum power dissipation depends on the thermal resistance of the IC package and the circuit board, the temperature difference between the die junction and ambient air, and the rate of ambient airflow. The power dissipated by the IC is P = IOUT x (VIN - VOUT). Proper PC board layout can increase the allowed power dissipation by dissipating heat in the board instead of the package. See the Thermal Considerations in PC Board Layout section for more details.
Short-Circuit/Thermal Fault Protection
The MAX8556/MAX8557 are fully protected from output short circuits through current-limiting and thermal-overload circuitry. When the output is shorted to ground, the output current is foldback limited to 3A (max). Under these conditions, the device quickly heats up. When the junction temperature reaches +160C, the thermaloverload circuitry turns off the output, allowing the device to cool. When the junction cools to +115C, the output turns back on and attempts to establish regulation. Current limiting and thermal protection continue until the fault is removed.
_______________________________________________________________________________________
7
4A Ultra-Low-Input-Voltage LDO Regulators MAX8556/MAX8557
Applications Information
Output Voltage Selection
The MAX8556/MAX8557 feature an adjustable output voltage from 0.5V to 3.4V. Set the output voltage using an external resistor-divider from the output to GND with FB connected to the center tap as shown in Figures 1 and 2. Choose R3 1k for light-load stability. Determine R2 using the following equation: V R2 = R 3 x OUT - 1 VFB where VOUT is the desired output voltage and VFB is 0.5V.
VIN 1.425V TO 3.6V C1 2 x 10F R1 100k 12 POK 1-6 IN OUT 7-11 R2 1.4k FB 13 R3 1k 18 SHUTDOWN EN N.C. 15 GND 14 VOUT 1.2V AT 4A C2 2 x 10F
U1 MAX8556
POK
ENABLED
Capacitor Selection and Regulator Stability
Capacitors are required at the MAX8556/MAX8557 inputs and outputs for stable operation over the full temperature range and with load currents up to 4A. Connect 2 x 10F capacitors between IN and GND and 2 x 10F low equivalent-series-resistance (ESR) capacitors between OUT and GND. The input capacitor (CIN) lowers the source impedance of the input supply. If the MAX8556/MAX8557s' input is close to the output of the source supply, a smaller input capacitance can be used. Otherwise, 2 x 10F ceramic input capacitors are recommended. The output capacitor's (C OUT ) ESR affects output noise and may affect output stability. Use output capacitors with an ESR of 0.05 or less to ensure stability and optimum transient dropout. For good output transient performance, use the following formula to select a minimum output capacitance: COUT = IOUT(MAX) x 1F / 200mA
Figure 1. MAX8556 Typical Application Circuit
VIN 1.7V TO 3.6V C1 2 x 10F R1 100k
1-6
IN
OUT
7-11 R2 2k
VOUT 1.5V AT 4A C2 2 x 10F
U2 MAX8557
12 POR FB 13
POR
ENABLED 18 SHUTDOWN EN N.C. 15 GND 14
R3 1k
Noise, PSRR, and Transient Response
The MAX8556/MAX8557 are designed to operate with low dropout voltages and low quiescent currents while still maintaining low noise, good transient response, and high AC rejection (see the Typical Operating Characteristics for a plot of Power-Supply Rejection Ratio (PSRR) vs. Frequency). When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. The MAX8556/ MAX8557 load-transient response graphs (see the
Figure 2. MAX8557 Typical Application Circuit
Typical Operating Characteristics) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient overshoot for a step change in the load current from 40mA to 4A is 40mV. Use an output capacitance from 20F to 120F to attenuate the overshoot.
8
_______________________________________________________________________________________
4A Ultra-Low-Input-Voltage LDO Regulators
Thermal Considerations in PC Board Layout
How much power the package can dissipate strongly depends on the mounting method of the IC to the PC board and the copper area for cooling. Using the JEDEC test standard, the maximum power dissipation allowed in the package is 2667mW. This data is obtained with +70C ambient temperature and +150C maximum junction temperature. The test board has dimensions of 3in x 3in with four layers of 2oz copper and FR-4 material with 62mil finished thickness. Nine thermal vias are used under the thermal paddle with a diameter of 12mil and 1mil plated copper thickness. Top and bottom layers are used to route the traces. Two middle layers are solid copper and isolated from the nine thermal vias. More power dissipation can be handled by the package if great attention is given during PC board layout. For example, using the top and bottom copper as a heatsink and connecting the thermal vias to one of the middle layers (GND) transfers the heat from the package into the board more efficiently, resulting in lower junction temperature at high power dissipation in some MAX8556/MAX8557 applications. Furthermore, the solder mask around the IC area on both top and bottom layers can be removed to radiate the heat directly into the air. The maximum allowable power dissipation in the IC is as follows: PMAX = (TJ(MAX) - TA ) JC + CA where TJ(MAX) is the maximum junction temperature (+150C), T A is the ambient air temperature, JC (1.7C/W for the 16-pin TQFN) is the thermal resistance from the junction to the case, and CA is the thermal resistance from the case to the surrounding air through the PC board, copper traces, and the package materials. CA is directly related to system level variables and can be modified to increase the maximum power dissipation. The TQFN package has an exposed thermal pad on its underside. This pad provides a low thermal resistance path for heat transfer into the PC board. This low thermally resistive path carries a majority of the heat away from the IC. The PC board is effectively a heatsink for the IC. The exposed paddle should be connected to a large ground plane for proper thermal and electrical performance. The minimum size of the ground plane is dependent upon many system variables. To create an efficient path, the exposed paddle should be soldered to a thermal landing, which is connected to the ground plane by thermal vias. The thermal landing should be at least as large as the exposed paddle and can be made larger depending on the amount of free space from the exposed paddle to the other pin landings. A sample layout is available on the MAX8556 evaluation kit to speed designs.
MAX8556/MAX8557
Chip Information
TRANSISTOR COUNT: 3137 PROCESS: BiCMOS
_______________________________________________________________________________________
9
4A Ultra-Low-Input-Voltage LDO Regulators MAX8556/MAX8557
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.)
0.15 C A
D2
C L
D
b D2/2
0.10 M C A B
PIN # 1 I.D.
D/2
0.15 C B
k
PIN # 1 I.D. 0.35x45
E/2 E2/2 E (NE-1) X e
C L
E2
k L
DETAIL A
e (ND-1) X e
DETAIL B
e
L1
L
C L
C L
L
L
e 0.10 C A 0.08 C
e
C
A1
A3
PACKAGE OUTLINE 16, 20, 28, 32, 40L, THIN QFN, 5x5x0.8mm
21-0140
E
1
2
10
______________________________________________________________________________________
QFN THIN.EPS
4A Ultra-Low-Input-Voltage LDO Regulators
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.)
MAX8556/MAX8557
COMMON DIMENSIONS PKG. 16L 5x5 20L 5x5 28L 5x5 32L 5x5 40L 5x5 SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. A A1 A3 b D E e k L L1 N ND NE JEDEC 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0 0.02 0.05 0.20 REF. 0 0.02 0.05 0.20 REF. 0 0.02 0.05 0.20 REF. 0 0.02 0.05 0.20 REF. 0 0.05 0.20 REF. PKG. CODES T1655-1 T1655-2 T2055-2 T2055-3 T2055-4 T2855-1 T2855-2 T2855-3 T2855-4 T2855-5 T2855-6 T2855-7 T3255-2 T3255-3 T3255-4 T4055-1
EXPOSED PAD VARIATIONS
D2
MIN. NOM. MAX. MIN.
E2 3.10 3.20 3.10 3.20 3.10 3.20 3.10 3.20 3.10 3.25 2.70 3.25 2.70 2.70 3.25 2.70 3.10 3.10 3.10 3.20 3.35 2.80 3.35 2.80 2.80 3.35 2.80 3.20 3.20 3.20
NOM. MAX. ALLOWED
DOWN BONDS
3.00 3.00 3.00 3.00 3.00 3.15 2.60 3.15 2.60 2.60 3.15 2.60 3.00 3.00 3.00 3.20
3.10 3.20 3.00 3.10 3.20 3.00 3.10 3.20 3.00 3.10 3.20 3.00 3.10 3.25 2.70 3.25 2.70 2.70 3.25 2.70 3.10 3.10 3.10 3.20 3.35 2.80 3.35 2.80 2.80 3.35 2.80 3.20 3.20 3.20 3.00 3.15 2.60 3.15 2.60 2.60 3.15 2.60 3.00 3.00 3.00
0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 0.80 BSC. 0.65 BSC. 0.50 BSC. 0.50 BSC. 0.40 BSC. - 0.25 - 0.25 - 0.25 0.35 0.45 0.25 - 0.25 0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60 16 4 4 WHHB 20 5 5 WHHC 28 7 7 WHHD-1 32 8 8 WHHD-2 0.30 0.40 0.50 40 10 10 -
NO YES NO YES NO NO NO YES YES NO NO YES NO YES NO YES
3.30 3.40 3.20
3.30 3.40
NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. 5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm FROM TERMINAL TIP. 6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. 7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. 8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-1, T2855-3 AND T2855-6. 10. WARPAGE SHALL NOT EXCEED 0.10 mm. PACKAGE OUTLINE 16, 20, 28, 32, 40L, THIN QFN, 5x5x0.8mm
21-0140
E
2
2
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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