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GM2576
2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Description
GM2576 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. GM2576 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 GM2576 is high-efficiency replacements for popular three-terminal linear regulators, and is requiring a smaller heat sink or even no need heat sink. GM2576 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. GM2576 operates at a switching frequency of 52 kHz which allowing smaller size filter components than what would be needed with lower frequency switching regulators. GM2576 series are available in a standard 8-lead SO package, 8 lead SO package with heat sink or 5L TO252 package.
Features
Standard SOP8 & PSOP8 and 5L TO252 packages are available 3.3V, 5V, and Adjustable output versions Adjustable version output voltage range 1.23V to 37V VOUT accuracy is to 1.8% under specified input voltage and 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 52 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)
Typical Application Circuits
GM2576-5.0
7V - 40V Unregulated DC Input FB
VIN
Output
L1 100H
5V regulated output,
CIN 100F
SD
GND D1 1N5822 COUT 680F
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GM2576
2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Marking Information and Pin Configurations (Top View)
SO8 & PSO8
GND GND GND GND
5L TO-252
GM2576
GM2576G VVAYWW
VVVAYWW
2. VOUT 1. VIN 5.SD 4.FB 3.GND
VIN VOUT
SD FB
VVV: 033=3.3V, 050=5.0V, 00A=ADJ A: Assembly / Testing factory code Y: Year WW: Week
VV: 33=3.3V, 50=5.0V, A=ADJ A: Assembly / Testing factory code Y: Year WW: Week
Ordering Information
Ordering Number GM2576-AS8T GM2576-AS8R GM2576-APS8T GM2576-APS8R GM2576-ATC5RG GM2576-3.3S8T GM2576-3.3S8R GM2576-3.3PS8T GM2576-3.3PS8R GM2576-3.3TC5RG GM2576-5.0S8T GM2576-5.0S8R Output Voltage Adj Adj Adj Adj Adj 3.3 3.3 3.3 3.3 3.3 5.0 5.0 5.0 5.0 5.0 Package SOP8 SOP8 PSOP8 PSOP8 5L-TO252 SOP8 SOP8 PSOP8 PSOP8 5L-TO252 SOP8 SOP8 PSOP8 PSOP8 5L-TO252 Shipping 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 50 Units / Tube 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 50 Units / Tube 100 Units / Tube 2500 Units / Reel 100 Units / Tube 2500 Units / Reel 50 Units / Tube
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GM2576-5.0PS8T GM2576-5.0PS8R GM2576-3.3TC5RG
GM2576
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
FB R2* VIN Regulator With Enable Comparator R1* 1.23V Reference Gnd 52KHz Oscillator Reset Thermal Shutdown & Current Limit VOUT Driver
Error Amplifier
SD
VOUT = 3.3V, R1 = 2.49K, R2 = 4.18K VOUT = 5.0V, R1 = 2.49K, R2 = 7.57K VOUT = ADJ, R1 = OPEN, R2 = 0
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GM2576
2A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM2576-ADJ
(Specifications with standard type face are for T = 25J , and those with bold face type apply over full Operating Temperature rage)
Parameter Feedback Voltage
Efficiency
Condition
VIN =12V, ILOAD = 0.2A, VOUT is set to 5V 4.5V < VIN < 40V, 0.2A < ILOAD < 2A, VOUT is set to 5V VIN =12V, ILOAD=2.0A, VOUT = 5V
Symbol
VFB
Min
1.217 1.208 1.180
Typ
1.230 1.230 77
Max
1.243 1.252 1.280
Unit
V
%
Electrical Characteristics: GM2576-3.3
(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
4.5V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A,
Symbol
VOUT
Min
3.163 3.201
Typ
3.300 73
Max
3.390 3.432
Unit
V %
Electrical Characteristics: GM2576-5.0
(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
4.5V < VIN < 40V, 0.2A < ILOAD < 2A VIN =12V, ILOAD=2.0A
Symbol
VOUT
Min
4.850 4.800
Typ
5.000 77
Max
5.150 5.200
Unit
V %
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GM2576
2A STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: All Output Voltage Versions
(Specifications with standard type face are for T = 25J , and those with bold face type apply over full Operating Temperature rage)
Parameter
Feedback Bias Current Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current
Condition
VFB =5V (Adjustable Version Only) (Note 3) lOUT = 2A (Notes 4, 5) (Note 5) Peak Current (Notes 4, 5) Output =0V (Notes 4, 6) Output = -1V (Notes 4, 6) (Note 6) SD Pin = 5V (OFF)
Symbol
Ib fo VSAT DC lCL
Min
42 93 3.6 3.4
Typ
50 52 1.4 98 4.5
Max
100 500 58 1.8 2.0 6.9 7.5
Unit
nA kHz V % A
lL lQ lSTBY
-
7.5 5 50
2 30 10 200 1.0 0.8
mA mA A
Low (ON) SD Pin Logic lnput Level High (OFF) SD Pin lnput Current VLOGlC = 2.5V (OFF) VLOGlC = 0.5V (ON)
VIH
2.2 2.4
1.2
V
VIL IH IL
1.4 12 0
30 10 A
Note 1:
Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. The human body model is a 100pF capacitor discharge through a 1.5K resistor into each pin. External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. Where the GM2576 is used as shown in Figure 1&2 test circuits. No diode, inductor or capacitor connected to output pin. Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin removed from output and connected to 12V for the 3.V, 5V and Adj version, to force the output transistor switch OFF.
Note 2: Note 3:
Note 4: Note 5: Note 6:
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GM2576
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 GM2576, to keep the sensitive feedback wiring short.
FB VIN
GM2576-x.x
VOUT SD
L1 100H D1
VOUT COUT 680F L O A D
VIN Unregulatedd DC Input
CIN 100F
GND
Figure 1 Fixed Ouput Votlage Versions
CIN = 100F, Aluminum Electrolytic COUT = 680F, 25V, Aluminum Electrolytic D1 = Schottky L1 = 100H
FB VIN
GM2576-A
VOUT
L1 100H
VOUT R2 L O A D
VIN Unregulatedd DC Input
CIN 100F
GND
SD
D1 COUT 680F R1
GM2576V1.30
Figure 2 Adjustable Ouput Votlage Versions
CIN = 100F, Aluminum Electrolytic COUT = 680F, 25V, Aluminum Electrolytic D1 = Schottky L1 = 100H VOUT = VREF (1 + R2/R1) where VREF = 1.23V and R1 is between 1K to 5K
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GM2576
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
0.004 - 0.010 (0.012 - 0.254)
0.008 - 0.010 (0.203 - 0.254)
8.0 MAX
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GM2576
2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Package Outline Dimensions - 5L TO252
0.250 - 0.262 (6.350 - 6.650) 0.205 - 0.213 (5.200 - 5.400)
0.087 - 0.094 (2.200 - 2.400) 0.017 - 0.023 (0.430 - 0.580)
0.374 - 0.390 (9.500 - 9.900)
0.213 - 0.224 (5.400 - 5.700)
0.150 REF (3.800)
0.000 - 0.005 (0.000 - 0.127) 0.100 - 0.114 (2.550 - 2.900) 0.055 - 0.070 (1.400 - 1.780)
0.050 TYP. (1.27) 1.00 TYP. (2.540)
0.016 - 0.024 (0.400 - 0.600)
0.017 - 0.023 (0.430 - 0.580)
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GM2576
2A STEP DOWN VOLTAGE SWITCHING REGULATORS
Ordering Number
GM 2576 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 TA5: 5L TO252
R
Shipping Type R: Taping & Reel T: Tube
8 10 6
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