GM1117 Datasheet, PDF (1/13 Pages) Gamma Microelectronics Inc. – 1.0A LOW DROPOUT PRECISION LINEAR REGULATORS

AA
MICROELECTRONICS
Power Management
GM1117
1.0A LOW DROPOUT PRECISION LINEAR REGULATORS
Description
GM1117 of positive adjustable and fixed regulators is de-
signed to provide 1.0A output with low dropout voltage per-
formance. On-chip trimming adjusts the reference voltage
to 1%. For usage on working in post regulators or micro-
processor power supplies, low voltage operation and fast
transient response are required.
Pin-to-pin compatible with the LT1086 family of regulators,
GM1117 is available in surface-mount SOT-223 and TO-
252 packages.
Features
Adjustable or Fixed Output
Output Current of 1.0A
Dropout Voltage (Typical) 1.15V @ 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
Hard Drive Controllers
Battery Chargers
Adjustable Power Supply
TYPICAL APPLICATION CIRCUITS
(Adjustable Version)
GM1117-Adj
V_IN> 4.75V ₃
V_IN
V_OUT ²
ADJ
+
1
C1
10µF
Tant
(Fixed Version)
V_OUT= 3.45V
V_IN> 4.75V
GM1117-3.3
3 _VIN
V_OUT ²
R1
133W
1.0%
R2
232W
1.0%
+
C2
10µF
Tant. Min
+
C1
10µF
Tant
GND
1
V_OUT= 3.3V
+
C2
10µF
Tant. Min
R2
V_OUT= V_REF X (1 + _R1 ) + I_ADJ X R2
Notes:
1. C1 needed if device is far from filter capacitors
2. C2 minimum value required for stability
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