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Advanced
Monolithic
Systems
AMS2954
250mA LOW DROPOUT VOLTAGE REGULATOR
FEATURES
2.5V, 3.0V, 3.3V and 5.0V Versions
High Accuracy Output Voltage
Extremely Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Current and Thermal Limiting
Needs Minimum Capacitance (1µF) for Stability
Unregulated DC Positive Transients 60V
ADDITIONAL FEATURES (ADJ ONLY)
1.24V to 29V Programmable Output
Error Flag Warning of Voltage Output Dropout
Logic Controlled Electronic Shutdown
APPLICATIONS
Battery Powered Systems
Portable Consumer Equipment
Cordless Telephones
Portable (Notebook) Computers
Portable Instrumentation
Radio Control Systems
Automotive Electronics
Avionics
Low-Power Voltage Reference
GENERAL DESCRIPTION
The AMS2954 series are micropower voltage regulators ideally suited for use in battery-powered systems. These devices
feature very low quiescent current (typ.75µA), and very low dropout voltage (typ.50mV at light loads and 380mV at 250mA)
thus prolonging battery life. The quiescent current increases only slightly in dropout. The AMS2954 has positive transient
protection up to 60V and can survive unregulated input transient up to 20V below ground. The AMS2954 was designed to
include a tight initial tolerance (typ. 0.5%), excellent load and line regulation (typ. 0.05%), and a very low output voltage
temperature coefficient, making these devices useful as a low-power voltage reference.
The AMS2954 is available in the 3L TO-220 package, 3L TO-263, SOT-223, TO-252 and in 8-pin plastic SOIC and DIP
packages. In the 8L SOIC and PDIP packages the following additional features are offered: an error flag output warns of a low
output voltage, often due to failing batteries on input; the logic-compatible shutdown input enables the regulator to be switched
on and off; the device may be pin-strapped for a, 2.5, 3.0V, 3.3V or 5V output, or programmed from 1.24V to 29V with an
external pair of resistors.
ORDERING INFORMATION
PACKAGE TYPE
3 LEAD TO-220 3 LEAD TO-263
TO-252
SOT-223
AMS2954ACT-X AMS2954ACM-X AMS2954ACD-X AMS2954AC-X
AMS2954CT-X AMS2954CM-X AMS2954CD-X AMS2954C-X
X = 2.5V, 3.0V, 3.3V, 5.0V
SOT-223 TOP VIEW
8 LEAD SOIC 8 LEAD PDIP
AMS2954ACS-X AMS2954CP-X
AMS2954CS-X AMS2954CP-X
3L TO-220 FRONT VIEW
OPERATING
TEMP. RANGE
IND.
IND
PIN CONNECTIONS
8L SOIC/ 8L PDIP
OUTPUT 1
SENSE 2
SHUTDOWN 3
GROUND 4
8 INPUT
7 FEEDBACK
6 VTAP
5 ERROR
Top View
Advanced Monolithic Systems, Inc.
123
INPUT GND OUTPUT
TO-252 FRONT VIEW
TAB IS
GND
3 OUTPUT
2 GND
1 INPUT
3L TO-263 FRONT VIEW
TAB IS
GND
3 OUTPUT
2
1 INPUT
TAB IS
GND
3 OUTPUT
2 GND
1 INPUT
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage
-0.3 to +30V
SHUTDOWN Input Voltage,
Error Comparator Output
Voltage,(Note 9)
FEEDBACK Input Voltage
-1.5 to +30V
(Note 9) (Note 10)
Power Dissipation
Internally Limited
Junction Temperature
+150°C
Storage Temperature
-65°C to +150°C
ESD 2kV
AMS2954
Soldering Dwell Time, Temperature
Wave
4 seconds, 260°C
Infrared
4 seconds, 240°C
Vapor Phase
4 seconds, 219°C
OPERATING RATINGS (Note 1)
Max. Input Supply Voltage
Junction Temperature Range
(TJ) (Note 8)
AMS2954AC-X
AMS2954C-X
40V
-40°C to +125°C
ELECTRICAL CHARACTERISTICS at Vs=Vout+1V, Ta=25°C, unless otherwise noted.
Parameter
2.5 V Versions (Note 16)
Output Voltage
Output Voltage
3.0 V Versions (Note 16)
Output Voltage
Output Voltage
3.3 V Versions (Note 16)
Output Voltage
Output Voltage
5 V Versions (Note 16)
Output Voltage
Output Voltage
All Voltage Options
Conditions
(Note 2)
TJ = 25°C
(Note 3)
-25°C TJ 85°C
Full Operating Temperature
Range
100 µA IL 250 mA
TJ TJMAX
TJ = 25°C
(Note 3)
-25°C TJ 85°C
Full Operating Temperature
Range
100 µA IL 250 mA
TJ TJMAX
TJ = 25°C
(Note 3)
-25°C TJ 85°C
Full Operating Temperature
Range
100 µA IL 250 mA
TJ TJMAX
TJ = 25°C
(Note 3)
-25°C TJ 85°C
Full Operating Temperature
Range
100 µA IL 250 mA
TJ TJMAX
AMS2954AC
Min. Typ. Max.
2.488 2.5 2.512
2.475 2.5 2.525
2.470 2.5 2.530
2.463 2.5 2.537
AMS2954C
Min. Typ. Max.
2.475 2.5 2.525
2.450 2.5 2.550
2.440 2.5 2.560
2.448 2.5 2.562
2.985
3.0
3.015
2.970
3.0
3.030
2.970
3.0
3.030
2.955
3.0
3.045
2.964
3.0
3.036
2.940
3.0
3.060
2.958
3.0
3.042
2.928
3.0
3.072
3.284
3.3
3.317
3.267
3.3
3.333
3.267
3.3
3.333
3.251
3.3
3.350
3.260
3.3
3.340
3.234
3.3
3.366
3.254
3.3
3.346
3.221
3.3
3.379
4.975
5.0
5.025
4.95
5.0
5.05
4.95
5.0
5.050
4.925
5.0
5.075
4.94 5.0 5.06 4.90 5.0 5.10
4.925
5.0
5.075
4.88
5.0
5.12
Output Voltage
Temperature Coefficient
Line Regulation (Note 14)
Load Regulation (Note 14)
(Note 12) (Note 4)
6V Vin 30V (Note 15)
100 µA IL 250 mA
20 100
0.03 0.1
0.04 0.16
50 150
0.04 0.2
0.1 0.2
Units
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ppm/°C
%
%
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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AMS2954
ELECTRICAL CHARACTERISTICS (Note 2) (Continued)
PARAMETER
Dropout Voltage
(Note 5)
Ground Current
Current Limit
Thermal Regulation
Output Noise,
10Hz to 100KHz
8-Pin Versions only
CONDITIONS
(Note 2)
IL = 100µ A
IL = 250 mA
IL = 100 µA
IL = 250 mA
Vout = 0
(Note 13)
CL = 1µF
CL = 200 µF
CL = 13.3 µF
(Bypass = 0.01 µF pins 7 to 1)
AMS2954AC
Min.
Typ.
50
380
Max.
80
600
75 120
15 20
200 500
0.05 0.2
430
160
100
AMS2954AC
AMS2954C
Min.
Typ.
50
380
Max.
80
600
75 120
15 20
200 500
0.05 0.2
430
160
100
AMS2954C
Units
mV
mV
µA
mA
mA
%/W
µV rms
µV rms
µV rms
Reference Voltage
Reference Voltage
Feedback Pin Bias Current
Over Temperature (Note 7)
1.22
1.235 1.25 1.21
1.235
1.26
1.19
1.27 1.185
1.285
40 60
40 60
V
V
nA
Reference Voltage Temperature
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
Shutdown Input
Input logic Voltage
Shutdown Pin Input Current
(Note 3)
Regulator Output Current in
Shutdown (Note 3)
( Note 12 )
V = 30V
OH
Vin = 4.5V
IOL = 400µA
(Note 6)
(Note 6)
(Note 6)
Low (Regulator ON)
High (Regulator OFF)
Vs = 2.4V
Vs = 30V
(Note 11)
20 50 ppm/°C
0.1 0.1 nA/°C
0.01 1
150 250
0.01 1
150 250
40 60
75
15
40 60
95 75
15
95
1.3 0.7
1.3 0.7
22
30 50
450 600
30 50
450 600
3 10
3 10
µA
mV
mV
mV
mV
V
V
µA
µA
µA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2: Unless otherwise specified all limits guaranteed for VIN = ( VONOM +1)V, IL = 100 µA and CL = 1 µF for 5V versions and 2.2µF for 3V and 3.3V
versions. 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 Additional conditions for the 8-pin versions are FEEDBACK tied to VTAP, OUTPUT tied to SENSE and VSHUTDOWN 0.8V.
Note 3: Guaranteed and 100% production tested.
Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V
differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at
VIN = ( VONOM +1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/Vref = (R1 + R2)/R2. For
example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds
remain constant as a percent of Vout as Vout is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 7: Vref Vout (Vin - 1V), 2.3 Vin30V, 100µAIL250 mA, TJ TJMAX.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

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AMS2954
Note 8: The junction-to-ambient thermal resistance are as follows:60°C/W for the TO-220 (T), 73°C/W for the TO-263 (M), 80°C/W for the TO-252 (D),
90°C/W for the SOT-223 (with package soldering to copper area over backside ground plane or internal power plane ϕ JA can vary from 46°C/W to >90°C/W
depending on mounting technique and the size of the copper area), 105°C/W for the molded plastic DIP (P) and 160°C/W for the molded plastic SO-8 (S).
Note 9: May exceed input supply voltage.
Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to
ground.
Note 11: Vshutdown 2V, Vin 30V, Vout =0, Feedback pin tied to 5VTAP.
Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 13: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 50mA load pulse at VIN =30V (1.25W pulse) for T =10 ms.
Note 14: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects
are covered under the specification for thermal regulation.
Note 15: Line regulation for the AMS2954 is tested at 150°C for IL = 1 mA. For IL = 100 µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%.
See typical performance characteristics for line regulation versus temperature and load current.
BLOCK DIAGRAM AND TYPICAL APPLICATIONS
AMS2954-XX
3 Lead Packages
AMS2954-XX
8 Lead Packages
UNREGULATED DC
+ INPUT
+
- ERROR
AMPLIFIER
+ 1.23V
REFERENCE
OUTPUT
VOUT
IL150mA
+ SEE APPLICATION
HINTS
GROUND
UNREGULATED DC
VOUT
IL150mA
78
1
+
FEED-
BACK
INPUT
OUTPUT
FROM
CMOS
OR TTL
3
SHUT-
DOWN
50mV
+
+
-
ERROR
AMPLIFIER
++
-
1.23V
REFERENCE
2
SENSE
6
VTAP
5
ERROR
4
GROUND
+ SEE APPLICATION
HINTS
330k
TO CMOS
OR TTL
ERROR DETECTION COMPARATOR
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
AMS2954
Quiescent Current
20
10
1
0.1
1
50 100 150 200 250
LOAD CURRENT (mA)
Dropout Characteristics
6
5V OUTPUT
5
4 IO=1mA
3
IO=250mA
2
1
0
0 1 234 5
INPUT VOLTAGE (V)
6
Input Current
250
225 5V OUTPUT
200
175
150
125
100 RL=
75
50
25
0
01
2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
Input Current
270
240 5V OUTPUT
210
180
IO=250mA
150
120
90
75
60
45
30
15
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
Temperature Drift of 3
Representative Units
5.06
5V OUTPUT
5.04
5.02
5.0
4.98
4.96
0.2%
4.94
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
Quiescent Current
160
5V OUTPUT
140
120
100 IL= 1 mA
80
IL= 0mA
60
40
20
0
01 23 45 6 7
INPUT VOLTAGE (V)
8
Quiescent Current
120
5V OUTPUT
110
100
IL= 100µA
VIN= 6V
90
80
70
60
50
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
Quiescent Current
35
5V OUTPUT
30
25
20 VIN= 6V
IL= 250mA
15
10
5
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (° C)
Quiescent Current
24
5V OUTPUT
21
18
15
IL= 250mA
12
9
6
3
0
01 234567
INPUT VOLTAGE (V)
8
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140