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Advanced
Monolithic
Systems
AMS3102
300mA LOW DROPOUT VOLTAGE REGULATOR
FEATURES
Fixed and Adjustable Versions Available
Output Current in excess of 300mA
Very Low Quiescent Current
Reverse Battery Protection
Input-output Differential less than 0.6V
Short Circuit Protection
Internal Thermal Overload Protection
Load Dump Protection
Overvoltage Protection
Mirror Image Insertion Protection
ON/OFF Pin
External PNP Drive
APPLICATIONS
Cellular Telephones
Portable Consumer Equipment
Portable (Notebook) Computers
Battery Powered Systems
Portable Instrumentation
Radio Control Systems
CD/DVD drives
GENERAL DESCRIPTION
The AMS3102 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 0.3mA or less when supplying 10mA loads. This unique
characteristic and the extremely low input-output differential required for proper regulation (0.25V for output currents of
100mA) make the AMS3102 ideal to use for standby power systems.
Internal circuitry of AMS3102 is protected from input fault conditions caused by reverse battery installation or input voltages
that exceed maximum rated input voltage. During line transients, such as load dump (40V) 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 AMS3102 series also includes internal current limiting, thermal shutdown,
and is able to withstand temporary power-up with mirror-image insertion.
The AMS3102 is offered in the 3-pin TO-92 package, SOT-89, 3 lead SOT-23, 5 lead SOT-23 and 8 lead SOIC packages.
The device is provided with On/Off pin in SOT-23 5L and in 8 lead SOIC package.
ORDERING INFORMATION
OUTPUT
PACKAGE TYPE
VOLTAGE
TO-92
SOT-89
3L SOT-23
5L SOT-23
FIXED AMS3102AN-X AMS3102AL-X (R)
AMS3102N-X AMS3102L-X (R)
ADJ.
X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V.
R = Reverse pin-out option
AMS3102AM-X
AMS3102M-X
AMS3102AM1-X
AMS3102M1-X
AMS3102CM1
SO-8
AMS3102AS-X
AMS3102S-X
AMS3102CS
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
21V
Overvoltage Protection
24V to 40V
Internal Power Dissipation (Note 4) Internally Limited
AMS3102
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 =VO +1V, IO =10mA, TJ=25°C, C2 = 22µF unless otherwise specified.
PARAMETER
Fixed Output Voltage Versions
Output Voltage Tolerance
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Output Noise Voltage
Output Impedance
Ripple Rejection
Maximum Operational Input
Voltage
Maximum Line Transient
Reverse Polarity Input Voltage,
D/C
Reverse Polarity Input Voltage,
Transient
CONDITIONS
(VIN+1V)
V
IN
21V,
IO=100
mA
-40°C T 125°C
J
(VIN+1V)
V
IN
15V
9V V 21V
IN
5mA I 100 mA
O
5mA 10 200 mA
I = 100 mA
O
I = 200 mA
O
I 10 mA,
O
I = 100 mA
O
I 200 mA (Note 5)
O
10Hz-100kHz, COUT = 100µF
100mADC and 10mArms,100Hz=10kHz
fO =120Hz
RL = 500, VO 5.5V
T = 1ms, τ ≤100ms
RL = 500, T = 1ms, τ ≤100ms
AMS3102A-X
Min.
Typ.
Max.
-1.0 +1.0
- 3.0 + 3.0
5 10
8 30
30 50
50 70
0.25 0.3
0.5 0.6
0.3 0.5
34
9 12
500
200
55 80
21 22
35 40
-35 -40
-35 -40
AMS3102-X
Min.
Typ. Max.
-3.0 +3.0
± 5.0
5 10
8 30
30 50
50 70
0.3 0.4
0.5 0.6
0.3 0.5
34
9 12
500
200
80
21 22
35 40
-35 -40
-35 -40
Units
%
%
mV
mV
mV
mV
mV
mV
mA
mA
mA
µV rms
m
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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AMS3102
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =6V, VOUT =3V IO =10mA, TJ=25°C, R1 =27k, C2 = 2µF 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.
1.210
1.20
2
AMS3102C
Typ.
1.235
1.235
Max.
1.26
1.270
20
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
+
1V
V
IN
21V
5mA I 100 mA
O
5mA I 200 mA
O
I 10 mA
O
I = 100 mA
O
I = 200 mA (Note 5)
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
VOFF = 2.4V
.02 1.5 mV/V
0.3 1 %
1 2%
0.05 0.2 V
0.3 0.4 V
0.5 0.6 V
0.3 0.5 mA
3 4 mA
0.3 0.5 mA
100 µVrms/V
40 200 m
0.4 %/1000hr
0.02 dB
21 22
V
35 40
V
-35 -40
-35 -40
V
V
1.8 1.5 V
2.5 2.0
V
35 60 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: 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 maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-to ambient thermal resistance θJ-A and
the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
P(MAX) = TJ(MAX) - TA
θJ - A
Where the value of the junction-to-ambient thermal resistance are as follows: 195°C/W for the TO-92 (N) package, 110°C/W for SOT-89 (L), 220°C/W for 5 lead
SOT-23 (M1) and 160°C/W for the molded plastic SO-8 (S).
Note 5: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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PIN CONNECTIONS
TO-92
Plastic Package (N)
OUTPUT
INPUT
GND
Bottom View
SOT-89
(L)
123
INPUT GND OUTPUT
Top View
AMS3102
SOT-89
(L)
R = Reverse pin-out
123
OUTPUT GND INPUT
Top View
3 Lead SOT-23
(M)
GND
INPUT OUTPUT
Top View
5 Lead SOT-23
(M1)
INPUT 1
GROUND 2
ON/OFF 3
5 OUTPUT
4 ADJ / N/C
Top View
8L SOIC
SO-Package (S)
OUTPUT 1
GROUND 2
GROUND 3
ADJ 4
N/C
8 INPUT
7 GROUND
6 GROUND
5 ON/OFF
N/C
Top View
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
0.6
0.5
0.4 IO = 200mA
0.3
0.2 IO = 150mA
IO = 100mA
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
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Low Voltage Behavior
6.0
AMS3102-3.3
5.0 IO = 100mA
4.0
3.0
2.0
0
2.0 3.0 4.0 5.0 6.0
INPUT VOLTAGE (V)
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 (Continued)
AMS3102
Output at Voltage Extremes
6
AMS3102-3.3
5 RL=500m
4
3
2
1
0
-1
-20 -10 0 10 20 30 40 50 60
INPUT VOLTAGE (V)
Peak Output Current
600
500
TJ= 25°C
400
300
200
100
0
0
10 20
INPUT VOLTAGE (V)
30
Ripple Rejection
85
80
C2 = 100 µF
TANTALUM
75
C2 = 100 µF
70 ALUM
65
60
55
50 IO= 10mA
45
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
17.5
15
12.5
Quiescent Current
3.3V OUTPUT
IO= 100 mA
10
7.5
5.0
2.5
0
-2.5
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
Quiescent Current
VIN = 6V
10
8
6
4
2
0
0 50 100 150 200 250 300 350
OUTPUT CURRENT (mA)
Quiescent Current
25
20
15
10
~~
3
2
1
0
-40
IO = 200mA
IO = 100mA
~~
IO = 50mA
IO = 0mA
0 40 80 120
TEMPERATURE (° C)
Output Impedance
10
IO = 10mA
1
0.1
0.01
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Operation During Load Dump
70
60
50
40
30
20 τ =150 ms
10
0
5
~~
CO= 100µF
4 RL= 500
3
2
1
0
-100 0 100 200 300 400
TIME (ms)
~~
500
1.30
1.28
1.26
Reference Voltage
AMS3102C
ADJUSTABLE
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
0
3 6 9 12 15 18 21 24
OUTPUT VOLTAGE (V)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140