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1 GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Description
The GM1112 is a positive low dropout regulator and is available in an adjustable version and fixed output voltage at 1.2V. All internal circuitry is designed to operate down to 800mV input to output differential and the dropout voltage is fully specified as a function of load current. On chip trimming adjusts the reference/output voltage to within 1%. Current limit is also trimmed in order to minimize the stress on both the regulator and the power source circuitry under overloaded conditions.
Features
Fixed Output, 1.2V Output Current of 1.0A Dropout Voltage 1.3V max @ 1.0A Line Regulation 0.2% max. Load Regulation 0.4% max. Fast Transient Response Current Limit Protection Thermal Shutdown Protection
Application
High Efficiency Linear Regulators Post Regulators for Switching Supplies Microprocessor Supply Battery Powered Equipment Reference Voltage Sources Hard Drive Controllers Battery Chargers Adjustable Power Supply
Typical Application Circuits
VIN VOUT
GM1112
C1 10F
C2 10F
www.gammamicro.com.tw
GM1112V1.03
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GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Marking Information and Pin Configurations (Top View)
TO 252 (D-PAK) TO 220 TO 263 (D2-PAK) SOT223
GM1112 AYWW GM1112 AYWW
GM1112 AYWW 1. Gnd
GM1112 AYWW
3. VIN
2. VOUT
1. Gnd
A: Assembly / Test site code Y: Year WW: Week
2. VOUT
3. VIN
2. VOUT
1. Gnd
3. VIN
2. VOUT
1. Gnd
3. VIN
GM1112V1.03
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3 GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Ordering Information
Ordering Number GM1112ST3T GM1112ST3R GM1112TC3T GM1112TC3R GM1112TB3T GM1112TA3T GM1112TA3R Package SOT-223 SOT-223 TO-252 TO-252 TO-220 TO-263 TO-263 Shipping 80 Units/Tube 2,500 Units / Tape & Reel 80 Units/Tube 2,500 Units / Tape & Reel 50 Units/Tube 50 Units/Tube 800 Units / Tape & Reel
Absolute Maximum Ratings
PARAMETER Input Voltage SOT-223 Thermal Resistance, Junction to Case TO-252 (D PAK) TO-263 (D2 PAK) Operating Junction Temperature Storage Temperature TJ Tstg JA SYMBOL VIN RATINGS 15 15.0 6.0 3.0 0 to 150 - 65 to 150 J J J /W UNITS V
GM1112V1.03
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GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Electrical Characteristics (TA = 25J
Parameter
Output Voltage
, unless otherwise noted) Min
1.18 1.17
Symbol
VOUT
Condition
IOUT =10mA, VIN = 5V 10mA IOUT 1.0A, 2.65V VIN 7V IOUT =10mA, 2.75V VIN 7V VIN = VOUT + 1V 10mA IOUT 1.0A IOUT =1A VIN = VOUT + 3V VIN = VOUT + 1V 10mA IOUT 1.0A VIN = VOUT + 1.5V IOUT = 10mA
Typ
1.20 1.20 0.04 0.2 1.15
Max
1.26
Unit
V
1.27 0.2 0.4 1.3 %/V %/mA V A 13 mA %/J %/W dB
Line Regulation Load Regulation Dropout Voltage Current Limit Quiescent Current (Fixed Output Voltage Versions) Temperature Coefficient Thermal Regulation Ripple Rejection
VOI VOL V ICL IQ
1.1
3.1 7 0.005 0.003
TC RA
TA=25C, 30ms pulse VIN = VOUT + 1.5V IOUT = 10mA 60
75
GM1112V1.03
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5 GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Application Information
Stability Considerations
A capacitor of 10uF as a minimum is suggested to be connected in the input terminal and to be as close as to the input source for better stability consideration. See typical application circuit page 1 for reference. The output compensation capacitor helps to determine three main characteristics of a linear regulator's performance: start-up delay, load transient response, and loop stability. The capacitor value and type is based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is preferred, as a film or ceramic capacitor with almost zero ESR can cause instability. An aluminum electrolytic capacitor is the least expensive type, but when the circuit operates at low temperatures, both the value and ESR of the capacitor will vary widely. For optimum performance over the full operating temperature range, a tantalum capacitor is best. A 22F tantalum capacitor will work fine in most applications, but with high current regulators such as the GM1112, higher capacitance values will improve the transient response and stability. Most applications for the GM1112 involve large changes in load current, so the output capacitor must supply instantaneous load current. The ESR of the output capacitor causes an immediate drop in output voltage given by: V = I X ESR In microprocessor applications an output capacitor network of several tantalum and ceramic capacitors in parallel is commonly used. This reduces overall ESR and minimizes the instantaneous output voltage drop under transient load conditions. The output capacitor network should be placed as close to the load as possible for the best results.
GM1112V1.03
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GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Package Outline Dimensions - SOT223
0.248 - 0.264 (6.30 - 6.71) 0.116 - 0.124 (2.95 - 3.15) 0.010 - 0.014 (0.25 - 0.36)
10 16 -
0.264 - 0.287 (6.71 - 7.29)
0.130 - 0.146 (3.30 - 3.71)
0.0008 - 0.0040 (0.0203 - 0.1016) 10 - 16 0.012 (0.31) 0.090 (2.29) 0.033 - 0.041 (0.84 - 1.04) NOM 10 MAX
0.071 (1.8) MAX
MIN
0.025 - 0.033 (0.64 - 0.84) 0.81 (4.6)NOM
NOM
Package Outline Dimensions - TO252
0.039 - 0.050 (1.020 - 1.270) 0.205 - 0.215 (5.210 - 5.460) 0.055 - 0.080 (1.400 - 2.030) 0.018 - 0.023 (0.460 - 0.580)
SEATING PLAN
0.210 - 0.228 (5.330 - 5.800)
0.370 - 0.410 (9.400 - 10.420)
0.090 (2.285) TYP
0.045 - 0.060 (1.150 - 1.520) 0.030 - 0.045 (0.760 - 1.140)
0.020 (0.510) MIN 0.018 - 0.023 (0.460 - 0.580)
GM1112V1.03
0.180 (4.570) TYP
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7 GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Package Outline Dimensions - TO263
0.390 - 0.415 (9.906 - 10.541) 0.105 - 0.180 (4.191 - 4.572)
0.045 - 0.055 (1.143 - 1.397)
0.060 (1.524) TYP
15 TYP
0.330 - 0.370 (8.382 - 9.398)
0.143 + 0.012 0.143 - 0.002 (3.632 + 0305) (3.362 - 0.508)
0.059 (1.499) TYP 0.050 +/- 0.012 (1.270 +/- 0.305)
0.020 - 0.039 (0.510 - 0.990) 0.090 - 0.110 (2.286 - 2.794) 0.050 (1.270)
0.013 - 0.023 (0.330 - 0.584)
GM1112V1.03
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GM1112
1A LOW DROPOUT PRECISION VOLTAGE REGULATOR
Ordering Number
GM 1112 ST3
APM Gamma Micro Circuit Type Package Type ST3: TA3: TB3: TC3: SOT223 TO263 TO220 TO252
R
Shipping Type R: Taping & Reel T: Tube
GM1112V1.03
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