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Advanced AMS3102
Monolithic 300mA LOW DROPOUT VOLTAGE REGULATOR
Systems
FEATURES APPLICATIONS
•• Fixed and Adjustable Versions Available •• Cellular Telephones
•• Output Current in excess of 300mA •• Portable Consumer Equipment
•• Very Low Quiescent Current •• Portable (Notebook) Computers
•• Reverse Battery Protection •• Battery Powered Systems
•• Input-output Differential less than 0.6V •• Portable Instrumentation
•• Short Circuit Protection •• Radio Control Systems
•• Internal Thermal Overload Protection •• CD/DVD drives
•• Load Dump Protection
•• Overvoltage Protection
•• Mirror Image Insertion Protection
•• ON/OFF Pin
••External PNP Drive
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 TEMP.
VOLTAGE TO-92 SOT-89 3L SOT-23 5L SOT-23 SO-8 RANGE
FIXED AMS3102AN-X AMS3102AL-X (R) AMS3102AM-X AMS3102AM1-X AMS3102AS-X IND
AMS3102N-X AMS3102L-X (R) AMS3102M-X AMS3102M1-X AMS3102S-X IND
ADJ. AMS3102CM1 AMS3102CS IND
X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V.
R = Reverse pin-out option
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AMS3102
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage
Maximum Junction Temperature +125°C
Operating 21V
Storage Temperature -65°C to +150°C
Overvoltage Protection 24V to 40V
Lead Temperature (Soldering 10 sec) 230°C
Internal Power Dissipation (Note 4) Internally Limited
ESD 2000V
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =VO +1V, IO =10mA, TJ=25°C, C2 = 22µF unless otherwise specified.
PARAMETER CONDITIONS
AMS3102A-X
Min. Typ. Max.
AMS3102-X
Min. Typ. Max.
Units
Fixed Output Voltage Versions
Output Voltage Tolerance -1.0 +1.0 -3.0 +3.0 %
(VIN+1V) ≤VIN ≤21V, IO=100 mA
-40°C ≤TJ ≤125°C - 3.0 + 3.0 ±± 5.0 %
Line Regulation (VIN+1V) ≤VIN ≤ 15V
9V ≤VIN ≤ 21V
5
8
10
30
5
8
10
30
mV
mV
Load Regulation 5mA ≤IO ≤ 100 mA
5mA ≤10 ≤ 200 mA
30
50
50
70
30
50
50
70
mV
mV
Dropout Voltage
IO = 100 mA
IO = 200 mA
0.25
0.5
0.3
0.6
0.3
0.5
0.4
0.6
V
V
Quiescent Current
IO ≤ 10 mA,
IO = 100 mA
IO ≤ 200 mA (Note 5)
0.3
3
9
0.5
4
12
0.3
3
9
0.5
4
12
mA
mA
mA
Output Noise Voltage 10Hz-100kHz, COUT = 100µF 500 500 µV rms
Output Impedance 100mADC and 10mArms,100Hz=10kHz 200 200 mΩ
Ripple Rejection fO =120Hz 55 80 80 dB
Maximum Operational Input
Voltage 21 22 21 22 V
Maximum Line Transient RL = 500Ω, VO ≤ 5.5V
T = 1ms, τ ≤100ms
35 40 35 40 V
Reverse Polarity Input Voltage,
D/C -35 -40 -35 -40 V
Reverse Polarity Input Voltage,
Transient RL = 500Ω, T = 1ms, τ ≤100ms -35 -40 -35 -40 V
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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 CONDITIONS
(Note 2)
Min. AMS3102C
Typ.
Max.
Units
Adjustable Version
Reference Voltage 1.210 1.235 1.26 V
IO ≤ 100 mA, -40°C ≤TJ ≤ 125°C, R1=27k,
Measured from VOUT to Adjust Pin 1.20 1.235 1.270 V
Output Voltage Range 2 20 V
Line Regulation VOUT + 1V ≤VIN ≤ 21V .02 1.5 mV/V
Load Regulation 5mA ≤IO ≤ 100 mA
5mA ≤IO ≤ 200 mA
0.3
1
1
2
%
%
Dropout Voltage
IO ≤ 10 mA
IO = 100 mA
IO = 200 mA (Note 5)
0.05
0.3
0.5
0.2
0.4
0.6
V
V
V
Quiescent Current
IO = 10 mA
IO = 100 mA
During Shutdown RL = 500Ω
0.3
3
0.3
0.5
4
0.5
mA
mA
mA
Output Noise Voltage 10Hz-100kHz 100 µVrms/V
Output Impedance 100mADC and 10mArms,100Hz=10kHz 40 200 mΩ
Long Term Stability T =1000hr 0.4 %/1000hr
Ripple Rejection fO = 120Hz 80 dB
Maximum Operational Input
Voltage 21 22 V
Maximum Line Transient IO = 10mA, Reference Voltage ≤ 1.5V
T = 1ms, τ ≤100ms
35 40 V
Reverse Polarity Input Voltage,
D/C RL = 500Ω, VO ≥ -0.3V -35 -40 V
Reverse Polarity Input Voltage,
Transient RL = 500Ω, T = 1ms, τ ≤100ms -35 -40 V
On/Off Threshold Voltage
On
Off
VO = 3V
2.5
1.8
2.0
1.5
V
V
On/Off Threshold Current VOFF = 2.4V 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:
A-J
AJT-(MAX)T
P(MAX) θ
=
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.
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AMS3102
PIN CONNECTIONS
TO-92
Plastic Package (N)
SOT-89
(L) SOT-89
(L)
R = Reverse pin-out
OUTPUT INPUT
GND 123
OUTPUTGNDINPUT
123
INPUTGNDOUTPUT
Bottom View Top View Top View
3 Lead SOT-23
(M) 5 Lead SOT-23
(M1)
8L SOIC
SO-Package (S)
INPUT OUTPUT
GND
INPUT OUTPUT
ON/OFF ADJ / N/C
GROUND
1
2
5
34
ON/OFF
N/C
OUTPUT
ADJ
N/C
INPUT
GROUND GROUND
GROUND
GROUND
1
2
8
4
3
7
5
6
Top View Top View
Top View
TYPICAL PERFORMANCE CHARACTERISTICS
6.0
Low Voltage Behavior
2.0
3.0
4.0
5.0
INPUT VOLTAGE (V)
AMS3102-3.3
2.0 3.0 4.0 5.0 6.0
0
IO = 100mA
0 40 80
0
0.6
0.4
0.2
Dropout Voltage
120
JUNCTION TEMPERATURE (° C)
INPUT OUTPUT DIFFERENTIAL (V)
0.1
0.5
0.3
IO = 100mA
0 150
0
0.6
0.4
0.2
Dropout Voltage
300
OUTPUT CURRENT (mA)
INPUT OUTPUT DIFFERENTIAL (V)
0.1
0.5
0.3
OUTPUT VOLTAGE (V)
IO = 150mA
IO = 200mA
200 25010050
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AMS3102
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
0 10 20
0
600
400
200
Peak Output Current
30
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
100
500
300
TJ= 25°C
-40 40 80 120
25
10
QUIESCENT CURRENT (mA)
Quiescent Current
TEMPERATURE (° C)
15
2
0
0
0 100 200
0
8
4
Quiescent Current
300
OUTPUT CURRENT (mA)
QUIESCENT CURRENT (mA)
2
10
6
-1
1
3
6
-20 -10 0 10 20 30 40 50 60
INPUT VOLTAGE (V)
Output at Voltage Extremes
OUTPUT VOLTAGE (V)
0
2
5
4
~
~~
~
VIN = 6V 20
3
1
IO = 50mA
IO = 0mA
AMS3102-3.3
RL=500m
Ω
50 150 250 350
-2.5
2.5
10
5.0
17.5
0 1 2 4 5 6 7 8 10
INPUT VOLTAGE (V)
Quiescent Current
QUIESCENT CURRENT (
µ
A)
0
7.5
15
12.5
IO= 100mA
45
55
70
60
85
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Ripple Rejection
RIPPLE REJECTION (dB)
50
65
80
75 C2 = 100
µ
F
ALUM
IO= 10mA
C2 = 100
µ
F
TANTALUM
3 9
3.3V OUTPUT
IO = 100mA
IO = 200mA
FREQUENCY (Hz)
OUTPUT IMPEDANCE (
Ω
)
0.01
10 Output Impedance
10k 1M
1 100
0.1
1
Operation During Load Dump
TIME (ms)
OUTPUT
VOLTAGE (V)
τ =150
ms
-100 0 100 200 300 400 500
0
1
4
0
10
50
70
CO= 100
µ
F
1.20
1.30 Reference Voltage
1.12
1.14
1.16
1.18
1.22
1.24
1.26
1.28
OUTPUT VOLTAGE (V)
REFERENCE VOLTAGE (V)
3 6 9 12 15 18 21 240
1.10
~
~
AMS3102C
ADJUSTABLE
INPUT
VOLTAGE (V)
1k10 100k
2
3
~
~
40
30
20
60
RL= 500
Ω
IO = 10mA
5
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AMS3102
APPLICATION NOTES
Definition of Terms
Dropout Voltage: The input-output voltage differential at which
the circuit stops to regulate against further reduction in input
voltage. Measured when the output voltage has dropped 100mV
from the nominal voltage obtained at 1V input, dropout voltage is
dependent upon load current and junction temperature.
Input Voltage: The DC voltage applied to the input terminal
with respect to ground.
Input-Output Differential: The voltage difference between the
unregulated input voltage and the regulated output voltage for
which the regulator will regulate.
Line Regulation: The change in output voltage for a change in
the input voltage. The line regulation is measured under
conditions of low dissipation or by using low duty cycle pulse
testing such that the average chip temperature is not significantly
affected.
Load Regulation: The change in output voltage for a change in
load current at constant chip temperature.
Long term stability: Output voltage stability under accelerated
life-test conditions after 1000 hours with maximum rated voltage
and junction temperature.
Output Noise Voltage: The rms AC voltage at the output, with
constant load and no input ripple, measured over a specified
frequency range.
Quiescent Current: That part of the positive input current that
does not contribute to the positive load current. The regulator
ground lead current.
Ripple Rejection: The ratio of the peak-to –peak input ripple
voltage to the peak-to-peak output ripple voltage at specified
frequency.
Temperature Stability of VO: The percentage change in output
voltage for a thermal variation from room temperature to either
temperature extreme.
External capacitor
The AMS3102 series require an output capacitor of 2.2µF or
greater to ensure device stability. Without the capacitor the
device may oscillate.
Most type of tantalum or electrolytic capacitor can be used in the
applications. A critical characteristic of the capacitors is an ESR
value of 5Ω or less and a resonant frequency above 500kHz. The
value of this capacitor can be increased without limits.
For higher loads, the value of the capacitor should be increased,
specially when the output voltage is set for 2.5V or less. The
AMS3102 lowest fixed output voltage value is 2.0V.
Typical application circuit (adjustable output)
R2
ADJ +
AMS3102
ADJUSTABLE
GND
C1
22
µ
F
10µ
F
OUT
OFF
ON
ON/OFF R1
28k
VOUT
VIN
100k
Minimum Load
In circuits using the fixed output voltage versions, minimum load
is not required. For circuits using the adjustable device, the value
of R1 and R2 should be chosen such, that a current of
approximately 40µA flows through the network. The reference
voltage (1.235V) is measured between the adjust pin and VOUT.
The output voltage can be set by the two resistors R1 and R2
using the following equation:
+
=R1R2R1
VV REFO
The value of R1 is recommended to be between 25kΩ to 30 kΩ,
and the value of R2 will set the output voltage.
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AMS3102
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
5 LEAD SOT-23 PLASTIC PACKAGE (M1)
0.140±0.010
(3.556±0.127)
0.060±0.010
(1.524±0.254)
0.015±0.002
(0.381±0.051)
0.016±0.003
(0.406±0.076)
0.050±0.005
(1.270±0.127)
0.060±0.005
(1.524±0.127)
DIA
0.180±0.005
(4.572±0.127)
0.180±0.005
(4.572±0.127)
0.050
(1.270)
MAX
0.500
(12.70)
MIN UNCONTROLLED
LEAD DIMENSIONS
10°
NOM
5° NOM
N (TO-92 ) AMS DRW# 042391
0.90
(2.286)
NOM
0.059-0.070
(1.50-1.75)
0.014-0.020
(0.350-0.50)
0.110-0.120
(2.794-3.048)
0.102-0.118
(2.60-3.00)
0.037
(0.95)
TYP
0.075
(1.90)
TYP
0.018-0.024
(0.457-0.610)
10°
NOM
0.0035-0.0080
(0.090-0.20)
(SOT-23-5 ) AMS DRW# 051001
0.036-0.051
(0.090-1.30)
0.003
(0.150)
MAX
0.018-0.024
(0.457-0.610)
10°
NOM
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AMS3102
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
SOT-89 PLASTIC PACKAGE (L)
8 LEAD SOIC PLASTIC PACKAGE (S)
0.090-0.102
(2.29-2.60)
0.173-0.181
(4.40-4.60)
0.064-0.072
(1.62-1.83)
0.155-0.167
(3.94-4.25)
0.059
(1.50)
BSC
0.035-0.047
(0.89-1.20)
L (SOT-89 ) AMS DRW# 042392
0.118
(3.00)
BSC
0.014-0.019
(0.36-0.48)
0.017-0.022
(0.44-0.56)
0.084-0.090
(2.13-2.29)
0.055-0.063
(1.40-1.60) 0.014-0.017
(0.35-0.44)
0°-8° TYP
0.010-0.020
(0.254-0.508)
S (SO-8 ) AMS DRW# 042293
x 45°
0.016-0.050
(0.406-1.270)
0.008-0.010
(0.203-0.254)
0.004-0.010
(0.101-0.254)
0.014-0.019
(0.355-0.483)
0.053-0.069
(1.346-1.752)
0.050
(1.270)
TYP
0.150-0.157**
(3.810-3.988)
0.228-0.244
(5.791-6.197)
0.189-0.197*
(4.801-5.004)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1 2 3 4
8 7 6 5
