AMS2931
PIN CONNECTIONS
FIXED OUTPUT VOLTAGE
TO-92
8L SOIC
TO-220 (T)
TO-263 (M)
Plastic Package (N)
SO-Package (S)
OUTPUT
INPUT
TAB IS
GND
1
2
3
4
8
7
6
5
OUTPUT
GND
OUTPUT
GND
INPUT
OUTPUT
GROUND
GROUND
N/C
INPUT
GROUND
GROUND
N/C
INPUT
GND
Bottom View
Top View
Front View
Top View
ADJUSTABLE OUTPUT VOLTAGE
8L SOIC
SO-Package (S)
1
2
3
4
8
7
6
5
OUTPUT
GROUND
GROUND
ADJ
INPUT
GROUND
GROUND
ON/OFF
Top View
TYPICAL APPLICATIONS
AMS2931-X (Fixed Output)
AMS2931C (Adjustable Output)
VCC
VIN
VOUT
UNREGULATED
INPUT
AMS2931
REGULATED
OUTPUT
R3
51k
C2**
100mF
C1*
0.1mF
OUT
GND
VOUT
IQ
OFF
ON/OFF
AMS2931
ADJUSTABLE
R1
28k
C1*
0.1mF
+
ADJ
ON
C2**
100mF
*Required if regulator is located far from power supply filter.
**C2 must be at least 100mF 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).
GND
R2
VOUT = VREF ´ ( R1+R2)/R1
Note: Using 27k for R1 will automatically compensate for errors in
VOUT due to the input bias current of the Adjust Pin ( approx. 1mA)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
