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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Description
GM7109 series is designed to provide all the active function for a step-down (buck) switching regulator, and drives a maximum load current as high as 2A line and load regulations. GM7109 is available in fixed output voltages of 3.3V, 5V, and a versatile Adjustable output version. These regulators are simple to use and require minimum number of external components. The features include internal frequency compensation and a fixed-frequency oscillator. The GM7109 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heat sink or even no need heat sink. GM7109 performs well with standard inductors from most of manufacturers, and simplifying the design of switch-mode power supplies. External shutdown is included with 80 A (typical) standby current. The output switch has cycle-by-cycle current limiting as well as thermal shutdown for full protection under fault conditions. GM7109 operates at a switching frequency of 150 kHz which allowing smaller size filter components than what would be needed with lower frequency switching regulators. GM7109 series are available in a standard 8-lead SO package or 8 lead SO package with heat sink.
Features
Standard SOP8 & PSOP8 package 3.3V, 5V, and Adjustable output versions Adjustable version output voltage range 1.23V to 37V VOUT accuracy is to 2% under specified input voltage the output load conditions Input voltage range up to 40V Requires only 4 external components with High efficiency TTL shutdown capability, low power standby mode Built-in thermal shutdown, current limit protection Uses standard inductors 150 kHz fixed frequency internal oscillator
Application
Pre-regulator for linear regulators High-efficiency step-down buck regulator On-card/board switching regulators Positive to negative converter (buck-boost) LCD Monitors
Typical Application Circuits
GM7109-5.0
1 Unregulated DC Input FB 3 1 VIN Output 2 CIN 680F SD 4 GND 5, 6, 7, 8 D1 1N5824 L1 68H 5V regulated output,
COUT 220F
www.gammamicro.com.tw
GM7109V1.00
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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Marking Information and Pin Configurations (Top View)
SO8 & PSO8
GND GND GND GND
GM7109
VVVAYWW
VIN VOUT
SD FB
VVV: 033=3.3V, 050=5.0V, 00A=ADJ A: Assembly / Testing factory code Y: Year WW: Week
Ordering Information
Ordering Number GM7109-AS8T GM7109-AS8R GM7109-APS8T GM7109-APS8R GM7109-3.3S8T GM7109-3.3S8R GM7109-3.3PS8T GM7109-3.3PS8R GM7109-5.0S8T GM7109-5.0S8R GM7109-5.0PS8T GM7109-5.0PS8R Output Voltage Adj Adj Adj Adj 3.3 3.3 3.3 3.3 5.0 5.0 5.0 5.0 Package SOP8 SOP8 PSOP8 PSOP8 SOP8 SOP8 PSOP8 PSOP8 SOP8 SOP8 PSOP8 PSOP8 Shipping 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel
GM7109V1.00
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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Absolute Maximum Ratings (Note 1)
Rating Maximum Supply Voltage SD Pin Input Voltage / Feed Back Pin Voltage Output Voltage to Ground (Steady State) Power Dissipation Thermal Resistance - Junction to Ambient (JA) Storage Temperature Range Maximum Junction Temperature Operating Temperature Range Minimum EDS Rating (Note 2) Lead Temperature (Soldering, 10 sec)
** 2 square inch of FR-4, double sided, 1oz. minimum copper weight, is recommended
Value 45 -0.3 + VIN + 0.3 -0.3 + VIN + 0.3 Internally Limited 36 - 65 to 150 + 150 - 40 to 125 2 + 260
Unit V V V J /W J J J kV J
Block Diagram
SD VIN Current Source Bias 1.235V Reference 2.5V Reference Start UP COMP 2.5V Current Limit COMP GM R2 AMP COMP R1 = 2.5K Reset Freq. Shift 150KHz OSC Thermal Limit OUTPUT Latch Driver 2A Switch 220mV 220
For 3.3V, R2 = 4.2K For 5.0V, R2 = 7.6K For Adj, R2 = 0 and R1 = OPEN
GND
GM7109V1.00
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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM7109-ADJ
(Specifications with standard type face are for T = 25J , and those with bold face type apply over full Operating Temperature rage)
Parameter
Output Voltage Efficiency
Condition
4.5V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A, VOUT = 3V
Symbol
VOUT
Min
1.193 1.180
Typ
1.230 88
Max
1.267 1.280
Unit
V %
Electrical Characteristics: GM7109-3.3
(Specifications with standard type face are for T = 25J , and those with bold face type apply over full Operating Temperature rage)
Parameter
Output Voltage Efficiency
Condition
4.75V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A
Symbol
VOUT
Min
3.168 3.135
Typ
3.300 73
Max
3.432 3.465
Unit
V %
Electrical Characteristics: GM7109-5.0
(Specifications with standard type face are for T = 25J , and those with bold face type apply over full Operating Temperature rage)
Parameter
Output Voltage Efficiency
Condition
7V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A
Symbol
VOUT
Min
4.800 4.7500
Typ
5.000 80
Max
5.200 5.250
Unit
V %
GM7109V1.00
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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: All Output Voltage Versions
(Specifications with standard type face are for TJ = 25J , and those with bold face type apply over full Operating Temperature rage. Unless otherwise specified, VIN = 12V)
Parameter
Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Min Duty Cycle (OFF) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current SD Pin Logic lnput Level SD Pin lnput Current
Condition
VFB =1.3V (Adjustable Version Only)
Symbol
Ib
Min
127 110
Typ
10
Max
50 100 173 173
Unit
nA
(Note 6)
fo
150
kHz
IOUT = 2A (Notes 7, 8) (Note 8) (Note 9) Peak Current (Notes 7, 8) Output =0V (Notes 7, 9, 10) Output = -0.9V (Note 10) (Note 9) SD Pin = 5V (OFF), Note 10 Low (ON) High (OFF) VLOGlC = 2.5V (OFF) VLOGlC = 0.5V (ON)
VSAT DC DC lCL lL lQ lSTBY VIH VIL IH IL
-
1.16 100 0
1.4 1.5 -
V % % A
3.4 2.0 2 5 70 1.3 1.3 5 0.02 100 200 0.6 15 5
A mA mA A
V A A
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The human body model is a 100pF capacitor discharged through a 1.5Kresistor into each pin. Note 3: Typical numbers are at 25C and represent the most likely norm. Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the GM7109 is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 6: The switching frequency is reduced when the second stage current limit is activated. Note 7: No diode, inductor or capacitor connected to output pin. Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version.
GM7109V1.00
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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Test Circuit and Layout Guidelines
Careful layout is important with any switching regulators. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. To minimize inductance and ground loops, the lengths of the leads indicated by heavy lines in Figure 1&2 below should be kept as short as possible. Single point grounding (as indicated or ground plane construction should be used for best results. When using the Adjustable version, place the programming resistors as close as possible to GM7109, to keep the sensitive feedback wiring short.
1 VIN VIN Unregulatedd DC Input CIN 100F
3 FB
GM7109-x.x
5~8 GND 4 SD 2 VOUT
L1 100H D1 COUT 680F
VOUT L O A D
Figure 1 Fixed Ouput Votlage Versions
CIN = 470F, Aluminum Electrolytic COUT = 220F, 25V, Aluminum Electrolytic D1 = Schottky, 5A/40V L1 = 68H
1 VIN VIN Unregulatedd DC Input CIN 100F
3 FB
GM7109-A
5~8 GND 4 SD 2 VOUT
L1 100H
VOUT R2 L O A D
D1 COUT 680F R1
GM7109V1.00
Figure 2 Adjustable Ouput Votlage Versions
CIN = 470F, Aluminum Electrolytic COUT = 220F, 25V, Aluminum Electrolytic D1 = Schottky, 5A/40V L1 = 68H VOUT = VREF (1 + R2/R1)
6
GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Typical Performance Characteristics
Figure 3. Switch Saturation Voltage
1.4 1.3 SATURATlON VOLTAGE (V) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 25 C 125 C TJ = - 40C VlN =12V
SWlTCH CURRENT LlMlT (A) 5.5
Figure 4. Switch Current Limit
VlN = 12V VOUT =5V
5.0
4.5
4.0
0
1
2
3
4
3.5 -50
-25
0
25
50
75
100
125
SWlTCH CURRENT (A)
JUNCTlON TEMPERATURE (C)
Figure 5. Dropout Voltage
1.6 INPUT - OUTPUT DIFFERENTIAL 1.4 1.2 1.0 ILOAD = 1A 0.8 0.6 -50 -25 0 25 50 75 100 JUNCTION TEMPERATURE (C) L = 33H RIND = 0.04 VOUT = VREG = 50mV ILOAD = 2A
Figure 6. Operating Quiescent Current
24 20 SWlTCH CURRENT (mA) 16 12 8 Switch OFF 4 0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C) Switch ON 4.5V < VIN < 40V ISWITCH = 0
Figure 7. Shutdown Quiescent Current
150 100 CURRENT (A) 80 60 40 20 0 0 TJ = 25C TJ = -40C and 125C VON/OFF = 5V
Figure 8. Minimum Operating Supply Voltage
5 4 3 2 1 VOUT = 1.23V ILOAD = 120mA
SUPPLY VOLTAGE (V) 40
10 20 30 SUPPLY VOLTAGE (V)
0 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C)
Figure 9. SD Pin Current (Sinking)
8 7 6 CURRENT(A) 5 4 3 2 1 0 0 5 10 15 20 25 VIN = 40V TJ = -40C and 125C FREQUENCY (kHz)
Figure 10. Switching Frequency
160 155 150 145 140 135 130 120 -50 -25 0 25 50 75 100 125 JUNCTION TEMPERATURE (C)
SD PlN VOLTAGE(V)
GM7109V1.00
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GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Package Outline Dimensions - SO 8
0.189 - 0.197 (4.800 - 5.004)
0.228 - 0.244 (5.791 - 6.198) 0.016 - 0.050 (0.406 - 0.270)
D
0.014 - 0.020 (0.356 - 0.508)
0.050 (1.270) TYP 0.053 - 0.059 (1.346 - 1.753)
0.150 - 0.157 (3.810 - 3.988)
SEATING PLAN
0.004 - 0.010 (0.012 - 0.254)
0.008 - 0.010 (0.203 - 0.254)
8.0 MAX
Package Outline Dimensions - PSO 8
0.189 - 0.197 (4.800 - 5.004) 0.090 (2.286)
0.095 - 0.130 0.228 - 0.244 (2.410 - 3.300) (5.791 - 6.198) 0.016 - 0.050 (0.406 - 0.270)
D
0.014 - 0.020 (0.356 - 0.508)
0.050 (1.270) TYP 0.053 - 0.059 (1.346 - 1.753)
0.150 - 0.157 (3.810 - 3.988)
SEATING PLAN
GM7109V1.00
0.004 - 0.010 (0.012 - 0.254)
0.008 - 0.010 (0.203 - 0.254)
8.0 MAX
8
GM7109
150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Ordering Number
GM 7109 A
APM Gamma Micro Circuit Type Output Voltage A: Adj 3.3 = 3.3V 5.0 =5.0V
S8
Package Type S8: SO 8 PS8: Power SO 8
R
Shipping Type R: Taping & Reel T: Tube
8 10 6
GM7109V1.00
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