MICROELECTRONICS
A
A
Power Management
GM317
3- TERMINAL ADJUSTABLE REGULATOR
Features
Output current up to 1.5A
Output Voltages 1.2V to 37V
Input Regulation typ. 0.01% per input
Output Regulation typ. 0.1%
Peak Output Current Constant over
Temperature Range of Regulator
Available in TO-220 and TO-263 Packages
Ripple Rejection Typically 80dB
Direct replacements for LM317
Description
The GM317 is an adjustable 3-terminal positive voltage reg-
ulator capable of supplying in excess of 1.5 A over an out-
put voltage range of 1.2 V to 37 V. This voltage regulator is
exceptionally easy to use and requires only two external re-
sistors to set the output voltage. Further, it employs internal
current limiting, thermal shutdown and safe area compen-
sation, making it essentially blow-out proof.
The GM317 a wide variety of applications including local,
application, and on card regulation. This device can also
be used to make a programmable output regulator, or by
connecting a fixed resistor between the adjustment and out-
put. The GM317 can be used as a precise current regula-
tor.
TYPICAL APPLICATION
V
IN
GM317
V
IN
ADJ
V
OUT
V
OUT
R1
240W
+ C **
O
1碌F
C
IN
*
0.1碌F
I
ADJ
R2
V
OUT
= 1.25V (1+
R2
) + I
ADJ
R2
R1
Since I
ADJ
is controlled to less than 100碌A(chǔ), the error associated with this term is negligible
in most applications.
www.gammamicro.com
PRELIMINARY
GM317
V0.1
1
* 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.