AMS2931
PIN CONNECTIONS
FIXED OUTPUT VOLTAGE
TO-92
Plastic Package (N)
OUTPUT
INPUT
8L SOIC
SO-Package (S)
OUTPUT 1
GROUND 2
GROUND 3
8 INPUT
GND
7 GROUND
6 GROUND
5 N/C
TO-220 (T)
TO-263 (M)
OUTPUT
GND
INPUT
TAB IS
GND
OUTPUT
GND
INPUT
GND
N/C 4
Bottom View
Top View
Front View
Top View
ADJUSTABLE OUTPUT VOLTAGE
8L SOIC
SO-Package (S)
OUTPUT 1
GROUND 2
GROUND 3
ADJ 4
8 INPUT
7 GROUND
6 GROUND
5 ON/OFF
Top View
TYPICAL APPLICATIONS
AMS2931-X (Fixed Output)
AMS2931C (Adjustable Output)
V
CC
V
IN
UNREGULATED
INPUT
C1*
0.1µF
AMS2931
V
OUT
REGULATED
OUTPUT
C2**
100µF
C1*
0.1µF
R
3
51k
OFF
ON/OFF
ON
AMS2931
ADJUSTABLE
GND
I
Q
OUT
R
1
28k
ADJ
GND
R
2
+
C2**
100µF
V
OUT
*Required if regulator is located far from power supply filter.
**C2 must be at least 100µF to maintain stability; it can be increased
without bound to maintain regulation during transients and it should be
located as close as possible to the regulator. This capacitor must be
rated over the same operating temperature range like the regulator. The
ESR of this capacitor is critical (see curve).
V
OUT
= V
REF
×
( R
1
+R
2
)/R
1
Note: Using 27k for R1 will automatically compensate for errors in
V
OUT
due to the input bias current of the Adjust Pin ( approx. 1µA)
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
