GM317_12 Datasheet, PDF (1/9 Pages) Gamma Microelectronics Inc. – 3-TERMINAL 1.5A ADJUSTABLE REGULATOR

GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Description
Features
The GM317 is an adjustable 3-terminal positive
voltage regulator capable of supplying in excess
„
of 1.5 A over an output voltage range of 1.2 V to „
37 V. This voltage regulator is exceptionally
easy to use and requires only two external
„
resistors to set the output voltage. Further, it
„
employs internal current limiting, thermal
shutdown and safe area compensation, making ^„
it essentially blow out proof.
GM317 offers full overload protection. Included ^„
on the chip current limit, thermal overload
protection, and safe-area protection. Normally, _„
no capacitors is needed unless the device is
situated far from the input filter capacitors in
„
which case an input bypass is needed. An
optional output capacitor can added to improve
transient response.
Output current up to 1.5A
Output Voltages 1.2V to 37V
Input Regulation typ. 0.01%
Output Regulation typ. 0.1%
Peak Output Current Constant over
Temperature Range of Regulator
Available in TO-220, TO-263, TO252 and
SOT223 Packages
Ripple Rejection Typically 80dB
Direct replacements for LM317
Applications
„ Voltage Regulators
„ Power Supplies
„ Current Regulators
Typical Application Circuit
„ Switching Regulators
„ Current Limiter
„ Constant Current Battery Charger
„ Current Limited Charger
V_IN
C_IN*
0.1µF
V_{IN GM317} ^V_OUT
ADJ
I_ADJ
V_OUT
R1
240Ω
R2
C_O**
1µF
* C_IN is required if regulator is located an appreciable distance from power supply filter.
**C_{O i}s not needed for stability, however, it improve transient response.
V_OUT= 1.25V (1+
R2
R1
) + I_ADJR2
Since I_ADJ is controlled to less than 100µA, the error associated with this term is negligible
in most applications.
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