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Advanced
Monolithic
Systems
AMS2931
100mA LOW DROPOUT VOLTAGE REGULATOR
FEATURES
5V and Adjustable Versions Available*
Output Current in excess of 100mA
Very Low Quiescent Current
Reverse Battery Protection
Input-output Differential less than 0.6V
Short Circuit protection
Internal Thermal Overload Protection
60V Load Dump Protection
-50V Reverse Transient Protection
Mirror Image Insertion Protection
APPLICATIONS
Battery Powered Systems
Portable Consumer Equipment
Cordless Telephones
Portable (Notebook) Computers
Portable Instrumentation
Radio Control Systems
Automotive Electronics
GENERAL DESCRIPTION
The AMS2931 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered
systems. These devices feature very low quiescent current of 1mA or less when supplying 10mA loads. This unique
characteristic and the extremely low input -output differential required for proper regulation (0.2V for output currents of
10mA) make the AMS2931 ideal to use for standby power systems.
Originally designed for automotive applications, the AMS2931 and all regulated circuitry are protected from input fault
conditions caused by reverse battery installation or two battery jump starts. During line transients, such as load dump (60V)
when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the regulator will
automatically shut down to protect both internal circuits and the load. The AMS2931 series also includes internal current
limiting, thermal shutdown, and is able to withstand temporary power-up with mirror-image insertion.
The AMS2931 is offered in the 3-pin TO-92 package, 8-pin plastic SOIC, TO-220 and TO-263 packages.
ORDERING INFORMATION
OUTPUT
PACKAGE TYPE
VOLTAGE
TO-92
8 LEAD SOIC
TO-220
FIXED*
AMS2931AN-X AMS2931AS-X AMS2931AT-X
AMS2931N-X AMS2931S-X AMS2931T-X
ADJ.
AMS2931CS
X = 5V
*For additional available fixed voltages contact factory
TO-263
AMS2931AM-X
AMS2931M-X
OPER. TEMP
RANGE
IND
IND
IND
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage
Operating Range
26V
Overvoltage Protection
AMS2931A-X, AMS2931C
60V
AMS2931-X
50V
Internal Power Dissipation (Note 4) Internally Limited
AMS2931
Maximum Junction Temperature
+125°C
Storage Temperature
-65°C to +150°C
Lead Temperature (Soldering 10 sec)
230°C
ESD 2000V
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =14V, IO =10mA, TJ=25°C, C2 = 100µF unless otherwise specified.
PARAMETER
CONDITIONS
5 V Versions
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Output Noise Voltage
Output Impedance
Long Term Stability
Ripple Rejection
Maximum Operational Input
Voltage
Maximum Line Transient
Reverse Polarity Input Voltage,
D/C
Reverse Polarity Input Voltage,
Transient
6V
V
IN
26V,
IO=100
mA
-40°C T 125°C
J
9V V 16V
IN
6V V 26V
IN
5mA I 100 mA
O
I = 10 mA
O
I = 100 mA
O
I 10 mA, 6V V 26V
O IN
-40°C T 125°C
J
I
O
=
100
mA,
VIN
=
14V,
TJ
=
25°C
10Hz-100kHz, COUT = 100µA
100mADC and 10mArms,100Hz=10kHz
T =1000hr
fO =120Hz
RL = 500, VO 5.5V
T = 1ms, τ ≤100ms
RL = 500, T = 1ms, τ ≤100ms
AMS2931A-X
AMS2931-X
Min. Typ. Max. Min. Typ. Max.
4.81 5.0 5.19 4.75 5.0 5.25
4.75 5.25 4.5
5.5
2 10
4 30
14 50
0.05 0.2
0.3 0.6
0.4 1.0
2 10
4 30
14 50
0.05 0.2
0.3 0.6
0.4 1.0
5 15 30
15
500 500
200 200
20
55 80
20
80
26 33 26 33
60 70
50 70
-15 -30
-50 -80
-15 -30
-50 -80
Units
V
V
mV
mV
mV
mV
mV
mA
mA
µV rms
m
mV
dB
V
V
V
V
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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AMS2931
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =14V, VOUT =3V IO =10mA, TJ=25°C, R1 =27k, C2 = 100µF unless otherwise specified.
PARAMETER
Adjustable Version
Reference Voltage
Output Voltage Range
CONDITIONS
(Note 2)
IO
100
mA,
-40°C
T
J
125°C,
R1=27k,
Measured from VOUT to Adjust Pin
Min.
1.14
1.08
3
AMS2931C
Typ.
1.20
24
Max.
1.26
1.32
Units
V
V
V
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Output Noise Voltage
Output Impedance
Long Term Stability
Ripple Rejection
Maximum Operational Input
Voltage
Maximum Line Transient
Reverse Polarity Input Voltage,
D/C
Reverse Polarity Input Voltage,
Transient
On/Off Threshold Voltage
On
Off
On/Off Threshold Current
VOUT
+
0.6V
V
IN
26V
5mA I 100 mA
O
I 10 mA
O
I = 100 mA
O
I = 10 mA
O
I = 100 mA
O
During Shutdown RL = 500
10Hz-100kHz
100mADC and 10mArms,100Hz=10kHz
T =1000hr
fO = 120Hz
IO = 10mA, Reference Voltage 1.5V
T = 1ms, τ ≤100ms
RL = 500, VO -0.3V
RL = 500, T = 1ms, τ ≤100ms
VO = 3V
.02
0.3
0.05
0.3
0.4
15
0.8
100
40
0.4
0.02
26 33
60 70
-15 -30
-50 -80
2.0
3.25 2.2
20
1.5 mV/V
1%
0.2 V
0.6 V
1 mA
mA
1 mA
µVrms/V
m
%/1000hr
%/V
V
V
V
V
1.2 V
V
50 µA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see
the Electrical Characteristics tables.
Note 2: See Circuit in Typical Applications. To ensure constant junction temperature, low duty cycle pulse testing is used.
Note 3: Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for
TA = TJ = 25°C.
Note 4: The junction-to-ambient thermal resistance are as follows: 195°C/W for the TO-92 (N) package, 160°C/W for the molded plastic SO-8 (S), 50°C/W for the
TO-220 package and 73°C/W for the TO-263 package. If the TO-220 package is used with a heat sink, θJA is the sum of the package thermal resistance junction-to-
case of 3°C/W and the thermal resistance added by the heat sink and the thermal interface. The thermal resistance of the TO-263 package can be reduced by
increasing the PCB copper area thermally connected to the package: using 0.5 square inches of copper area, ϕ JA is 50°C/W; with 1 square inch of copper area ϕ JA is
37°C/W; and with 1.6 or more square inches of copper area ϕ JA is 32°C/W.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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PIN CONNECTIONS
FIXED OUTPUT VOLTAGE
TO-92
Plastic Package (N)
OUTPUT
INPUT
GND
Bottom View
8L SOIC
SO-Package (S)
OUTPUT 1
GROUND 2
GROUND 3
N/C 4
8 INPUT
7 GROUND
6 GROUND
5 N/C
Top View
AMS2931
TO-220 (T)
OUTPUT
GND
INPUT
TO-263 (M)
TAB IS
GND
OUTPUT
GND
INPUT
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)
VCC
VIN
UNREGULATED
INPUT
C1*
0.1µF
AMS2931
GND
IQ
VOUT
REGULATED
OUTPUT
C2**
100µF
*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).
C1*
0.1µF
R3
51k
OFF
OUT
VOUT
ON/OFF AMS2931
ADJUSTABLE
R1
28k
ON ADJ + C2**
GND
100µF
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. 1µA)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
0.6
0.5
0.4 IO = 100mA
0.3
IO = 50mA
0.2
IO = 10mA
0.1
0
0 40 80 120
JUNCTION TEMPERATURE (° C)
Dropout Voltage
0.6
0.5
0.4
0.3
0.2
0.1
0
0
50 100
OUTPUT CURRENT (mA)
AMS2931
Low Voltage Behavior
6.0
AMS2931-5.0
5.0 IO = 100mA
4.0
3.0
2.0
0
2.0 3.0 4.0 5.0 6.0
INPUT VOLTAGE (V)
Output at Voltage Extremes
12
AMS2931-5.0
10 RL=500
8
6
4
2
0
-2
-20 -10 0 10 20 30 40 50 60
INPUT VOLTAGE (V)
Line Transient Response
3
2
1
0
-1
-2
-3 ~~
VIN = VOUT = 9V
C2= 100 µF
~~
3
0
0
15 30
TIME (µs)
45
Load Transient Response
40 C2= 100µF
0
-40
~~
150
~~
0
0
15 30
TIME (µs)
45
Peak Output Current
600
500
400
300
200
100
0
0
TJ= 25°C
TJ = 85°C
TJ = -40°C
10 20
INPUT VOLTAGE (V)
30
Quiescent Current
30
VIN = 14V
25
20
15
10
5
0
0 30 60 90
OUTPUT CURRENT (mA)
Quiescent Current
25
20
15
10
~~
3
2
1
0
-40
IO = 50mA
~~
IO = 0mA
0 40 80 120
TEMPERATURE (° C)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140