GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Description
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.
Features
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
Switching Regulators
Current Limiter
Constant Current Battery Charger
Current Limited Charger
Typical Application Circuit
V
IN
V
IN
GM317
ADJ
I
ADJ
V
OUT
V
OUT
R1
240Ω
C
O
**
1µF
C
IN
*
0.1µF
R2
* 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
) + I
ADJ
R2
R1
Since I
ADJ
is controlled to less than 100µA, the error associated with this term is negligible
in most applications.
1
GM317
V1.01
GAMMA [ GAMMA MICROELECTRONICS INC. ]
