STEP DOWN VOLTAGE SWITCHING REGULATORS GM2576 series designed pro
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GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
GM2576 series designed provide active function step-down (buck) switching regulator, drives maximum load current high line load regulations. GM2576 available fixed output voltages 3.3V, versatile Adjustable output version. These regulators simple require minimum number external components. features include internal frequency compensation fixed-frequency oscillator. GM2576 high-efficiency replacements popular three-terminal linear regulators, requiring smaller heat sink even need heat sink. GM2576 performs well with standard inductors from most manufacturers, simplifying design switch-mode power supplies. External shutdown included with (typical) standby current. output switch cycle-by-cycle current limiting well thermal shutdown full protection under fault conditions. GM2576 operates switching frequency which allowing smaller size filter components than what would needed with lower frequency switching regulators. GM2576 series available standard 8-lead package, lead package with heat sink TO252 package.
Features
Standard SOP8 PSOP8 TO252 packages available 3.3V, Adjustable output versions Adjustable version output voltage range 1.23V VOUT accuracy ±1.8% under specified input voltage output load conditions Input voltage range Requires only external components with High efficiency shutdown capability, power standby mode Built-in thermal shutdown, current limit protection Uses standard inductors fixed frequency internal oscillator
Application
Pre-regulator linear regulators High-efficiency step-down buck regulator On-card/board switching regulators Positive negative converter (buck-boost)
Typical Application Circuits
GM2576-5.0
Unregulated Input
Output
100µH
regulated output,
100µF
1N5822 COUT 680µF
www.gammamicro.com.tw
GM2576V1.30
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
Marking Information Configurations (Top View)
PSO8
TO-252
GM2576
GM2576G VVAYWW
VVVAYWW
VOUT 5.SD 4.FB 3.GND
VOUT
VVV: 033=3.3V, 050=5.0V, 00A=ADJ Assembly Testing factory code Year Week
33=3.3V, 50=5.0V, A=ADJ Assembly Testing factory code Year 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 Package SOP8 SOP8 PSOP8 PSOP8 5L-TO252 SOP8 SOP8 PSOP8 PSOP8 5L-TO252 SOP8 SOP8 PSOP8 PSOP8 5L-TO252 Shipping Units Tube 2500 Units Reel Units Tube 2500 Units Reel Units Tube Units Tube 2500 Units Reel Units Tube 2500 Units Reel Units Tube Units Tube 2500 Units Reel Units Tube 2500 Units Reel Units Tube
GM2576V1.30
GM2576-5.0PS8T GM2576-5.0PS8R GM2576-3.3TC5RG
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
Absolute Maximum Ratings (Note
Rating Maximum Supply Voltage Input Voltage Feed Back Voltage Output Voltage Ground (Steady State) Power Dissipation Thermal Resistance Junction Ambient (JA) Storage Temperature Range Maximum Junction Temperature Operating Temperature Range Minimum Rating (Note Lead Temperature (Soldering, sec)
square inch FR-4, double sided, 1oz. minimum copper weight, recommended
Value -0.3 -0.3 Internally Limited
Unit
Block Diagram
Regulator With Enable Comparator 1.23V Reference 52KHz Oscillator Reset Thermal Shutdown Current Limit VOUT Driver
Error Amplifier
VOUT 3.3V, 2.49K, 4.18K VOUT 5.0V, 2.49K, 7.57K VOUT ADJ, OPEN,
GM2576V1.30
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: GM2576-ADJ
(Specifications with standard type face those with bold face type apply over full Operating Temperature rage)
Parameter Feedback Voltage
Efficiency
Condition
=12V, ILOAD 0.2A, VOUT 4.5V 40V, 0.2A ILOAD VOUT =12V, ILOAD=2.0A, VOUT
Symbol
1.217 1.208 1.180
1.230 1.230
1.243 1.252 1.280
Unit
Electrical Characteristics: GM2576-3.3
(Specifications with standard type face those with bold face type apply over full Operating Temperature rage)
Parameter
Output Voltage Efficiency
Condition
4.5V 40V, 0.2A ILOAD =12V, ILOAD=2.0A,
Symbol
VOUT
3.163 3.201
3.300
3.390 3.432
Unit
Electrical Characteristics: GM2576-5.0
(Specifications with standard type face those with bold face type apply over full Operating Temperature rage)
Parameter
Output Voltage Efficiency
Condition
4.5V 40V, 0.2A ILOAD =12V, ILOAD=2.0A
Symbol
VOUT
4.850 4.800
5.000
5.150 5.200
Unit
GM2576V1.30
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS Electrical Characteristics: Output Voltage Versions
(Specifications with standard type face those with bold face type apply over full Operating Temperature rage)
Parameter
Feedback Bias Current Oscillator Frequency Saturation Voltage Duty Cycle (ON) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current
Condition
(Adjustable Version Only) (Note lOUT (Notes (Note Peak Current (Notes Output (Notes Output (Notes (Note (OFF)
Symbol
VSAT
Unit
lSTBY
(ON) Logic lnput Level High (OFF) lnput Current VLOGlC 2.5V (OFF) VLOGlC 0.5V (ON)
Note
Stresses greater than those listed under Maximum Ratings cause permanent damage device. This stress rating only functional operation device these other conditions above those indicated operation implied. Exposure absolute maximum rating conditions extended periods affect reliability. human body model 100pF capacitor discharge through 1.5K resistor into each pin. External components such catch diode, inductor, input output capacitors, voltage programming resistors affect switching regulator system performance. Where GM2576 used shown Figure test circuits. diode, inductor capacitor connected output pin. Feedback removed from output connected force output transistor switch Feedback removed from output connected 3.V, version, force output transistor switch OFF.
Note Note
Note Note Note
GM2576V1.30
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
Test Circuit Layout Guidelines
Careful layout important with switching regulators. Rapidly switching currents associated with wiring inductance generate voltage transients which cause problems. minimize inductance ground loops, lengths leads indicated heavy lines Figure below should kept short possible. Single point grounding indicated ground plane construction should used best results. When using Adjustable version, place programming resistors close possible GM2576, keep sensitive feedback wiring short.
GM2576-x.x
VOUT
100µH
VOUT COUT 680µF
Unregulatedd Input
100µF
Figure Fixed Ouput Votlage Versions
100µF, Aluminum Electrolytic COUT 680µF, 25V, Aluminum Electrolytic Schottky 100µH
GM2576-A
VOUT
100µH
VOUT
Unregulatedd Input
100µF
COUT 680µF
GM2576V1.30
Figure Adjustable Ouput Votlage Versions
100µF, Aluminum Electrolytic COUT 680µF, 25V, Aluminum Electrolytic Schottky 100µH VOUT VREF R2/R1) where VREF 1.23V between
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
Package Outline Dimensions
0.189 0.197 (4.800 5.004)
0.228 0.244 (5.791 6.198) 0.016 0.050 (0.406 0.270)
0.014 0.020 (0.356 0.508)
0.050 (1.270) 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)
Package Outline Dimensions
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)
0.014 0.020 (0.356 0.508)
0.050 (1.270) 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)
GM2576V1.30
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
Package Outline Dimensions 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 (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)
GM2576V1.30
GM2576
STEP DOWN VOLTAGE SWITCHING REGULATORS
Ordering Number
2576
Gamma Micro Circuit Type Output Voltage 3.3V =5.0V
Package Type PS8: Power TA5: TO252
Shipping Type Taping Reel Tube
GM2576V1.30
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