ADMOS AMS2954CT-5.0, AMS2954CT-3.5, AMS2954CT-2.5, AMS2954CS-5.0, AMS2954CS-3.5 Datasheet

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

Advanced AMS2954
Monolithic 250mA LOW DROPOUT VOLTAGE REGULATOR
Systems

FEATURES APPLICATIONS

•• 2.5V, 3.0V, 3.3V and 5.0V Versions •• Battery Powered Systems

•• High Accuracy Output Voltage •• Portable Consumer Equipment

•• Extremely Low Quiescent Current •• Cordless Telephones

•• Low Dropout Voltage •• Portable (Notebook) Computers

•• Extremely Tight Load and Line Regulation •• Portable Instrumentation

•• Very Low Temperature Coefficient •• Radio Control Systems

•• Current and Thermal Limiting •• Automotive Electronics

•• Needs Minimum Capacitance (1µµF) for Stability •• Avionics

•• Unregulated DC Positive Transients 60V •• Low-Power Voltage Reference

ADDITIONAL FEATURES (ADJ ONLY)

•• 1.24V to 29V Programmable Output

•• Error Flag Warning of Voltage Output Dropout

•• Logic Controlled Electronic Shutdown

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

OPERATING

3 LEAD TO-220

3 LEAD TO-263

TO-252

SOT-223

8 LEAD SOIC

8 LEAD PDIP

TEMP. RANGE

AMS2954ACT-X

AMS2954ACM-X

AMS2954ACD-X

AMS2954AC-X

AMS2954ACS-X

AMS2954CP-X

IND.

AMS2954CT-X

AMS2954CM-X

AMS2954CD-X

AMS2954C-X

AMS2954CS-X

AMS2954CP-X

IND

X = 2.5V, 3.0V, 3.3V, 5.0V

PIN CONNECTIONS

8L SOIC/ 8L PDIP

1
2

8

4

3

7

5

6 V

TAP

ERROR

FEEDBACK

OUTPUT

SENSE

SHUTDOWN

INPUT

GROUND

TAB IS

GND

TO-252 FRONT VIEW

1

2

3

1

2

3

TAB IS

GND

1

2

3

TAB IS

GND

3L TO-263 FRONT VIEW

OUTPUT

INPUT

OUTPUT

OUTPUT

INPUT

INPUT

3L TO-220 FRONT VIEW

SOT-223 TOP VIEW

INPUT GND OUTPUT

GND

GND

1

2

3

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS2954

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage -0.3 to +30V Soldering Dwell Time, Temperature
SHUTDOWN Input Voltage, Wave

4 seconds, 260°C

Error Comparator Output Infrared

4 seconds, 240°C

Voltage,(Note 9) Vapor Phase

4 seconds, 219°C

FEEDBACK Input Voltage -1.5 to +30V
(Note 9) (Note 10)

OPERATING RATINGS (Note 1)

Power Dissipation

Internally Limited

Junction Temperature

+150°C

Max. Input Supply Voltage 40V

Storage Temperature

-65°C to +150°C

Junction Temperature Range

ESD

2kV

(TJ) (Note 8)
AMS2954AC-X
AMS2954C-X

-40°C to +125°C

ELECTRICAL CHARACTERISTICS at V

s

=Vout+1V, Ta=25°C, unless otherwise noted.

Parameter Conditions

(Note 2)

AMS2954AC

Min. Typ. Max.

AMS2954C

Min. Typ. Max.

Units

2.5 V Versions (Note 16)

Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature

Range

2.488

2.475

2.470

2.5

2.5

2.5

2.512

2.525

2.530

2.475

2.450

2.440

2.5

2.5

2.5

2.525

2.550

2.560

V
V
V

Output Voltage

100 µA ≤IL ≤250 mA
TJ ≤T

JMAX

2.463

2.5

2.537 2.448

2.5

2.562

V

3.0 V Versions (Note 16)
Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature

Range

2.985

2.970

2.964

3.0

3.0

3.0

3.015

3.030

3.036

2.970

2.955

2.940

3.0

3.0

3.0

3.030

3.045

3.060

V
V
V

Output Voltage

100 µA ≤IL ≤250 mA
TJ ≤T

JMAX

2.958

3.0

3.042 2.928

3.0

3.072

V

3.3 V Versions (Note 16)
Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature

Range

3.284

3.267

3.260

3.3

3.3

3.3

3.317

3.333

3.340

3.267

3.251

3.234

3.3

3.3

3.3

3.333

3.350

3.366

V
V
V

Output Voltage

100 µA ≤IL ≤250 mA
TJ ≤T

JMAX

3.254

3.3

3.346 3.221

3.3

3.379

V

5 V Versions (Note 16)
Output Voltage

TJ = 25°C (Note 3)

-25°C ≤TJ ≤85°C
Full Operating Temperature

Range

4.975

4.95

4.94

5.0

5.0

5.0

5.025

5.050

5.06

4.95

4.925

4.90

5.0

5.0

5.0

5.05

5.075

5.10

V
V
V

Output Voltage

100 µA ≤IL ≤250 mA
TJ ≤T

JMAX

4.925

5.0

5.075 4.88

5.0

5.12

V

All Voltage Options

Output Voltage
Temperature Coefficient (Note 12) (Note 4)

20 100 50 150

ppm/°C

Line Regulation (Note 14)

6V ≤Vin ≤30V (Note 15)

0.03 0.1 0.04 0.2 %

Load Regulation (Note 14)

100 µA ≤IL ≤ 250 mA

0.04 0.16 0.1 0.2 %

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS2954

ELECTRICAL CHARACTERISTICS (Note 2) (Continued)

PARAMETER CONDITIONS

(Note 2)

AMS2954AC

Min. Typ. Max.

AMS2954C

Min. Typ. Max.

Units

Dropout Voltage
(Note 5)

IL = 100µ A
IL = 250 mA

50

380

80

600

50

380

80

600

mV
mV

Ground Current

IL = 100 µA
IL = 250 mA

75
15

120

20

75
15

120

20

µA

mA

Current Limit

V

out

= 0 200 500 200 500 mA
Thermal Regulation (Note 13) 0.05 0.2 0.05 0.2 %/W
Output Noise,

10Hz to 100KHz

CL = 1µF
CL = 200 µF
CL = 13.3 µF
(Bypass = 0.01 µF pins 7 to 1)

430
160
100

430
160
100

µV rms
µV rms
µV rms

8-Pin Versions only AMS2954AC AMS2954C

Reference Voltage 1.22 1.235 1.25 1.21 1.235 1.26 V
Reference Voltage Over Temperature (Note 7)

1.19 1.27 1.185 1.285

V

Feedback Pin Bias Current 40 60 40 60 nA

Reference Voltage Temperature
Coefficient

( Note 12 )

20 50 ppm/°C

Feedback Pin Bias Current
Temperature Coefficient

0.1 0.1 nA/°C

Error Comparator

Output Leakage Current

V

OH

= 30V 0.01 1 0.01 1

µA

Output Low Voltage

Vin = 4.5V
IOL = 400µA

150 250 150 250 mV

Upper Threshold Voltage

(Note 6) 40 60 40 60 mV

Lower Threshold Voltage

(Note 6) 75 95 75 95 mV

Hysteresis

(Note 6) 15 15 mV

Shutdown Input

Input logic Voltage

Low (Regulator ON)
High (Regulator OFF)

2

1.3

0.7
2

1.3

0.7

V
V

Shutdown Pin Input Current
(Note 3)

Vs = 2.4V
Vs = 30V

30
450

50
600

30
450

50
600

µA
µA

Regulator Output Current in
Shutdown (Note 3)

(Note 11) 3 10 3 10

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 V

IN

= ( V

ONOM

+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 V

TAP

, OUTPUT tied to SENSE and V

SHUTDOWN

≤ 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
V

IN

= ( V

ONOM

+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 V

out

as V

out

is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

Note 7: V

ref ≤Vout

≤ (Vin - 1V), 2.3 ≤Vin≤30V, 100µA≤IL≤ 250 mA, TJ ≤ T

JMAX

.

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

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: V

shutdown

≥ 2V, Vin ≤ 30V, V

out

=0, Feedback pin tied to 5V

TAP

.

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

INPUT

OUTPUT

GROUND

ERROR
AMPLIFIER

1.23V
REFERENCE

UNREGULATED DC

V

OUT

IL≤ 150mA

SEE APPLICATION

HINTS

+

+

+

+

-

INPUT OUTPUT

GROUND

ERROR
AMPLIFIER

1.23V
REFERENCE

UNREGULATED DC

V

OUT

I

L

≤

150mA

SEE APPLICATION

HINTS

+

+

+

+

-

FEED­BACK

SHUT-

DOWN

SENSE

V

TAP

ERROR

TO CMOS
OR TTL

+

-

+

330k

Ω

4

5

6

2

187

3

FROM
CMOS

OR TTL

50mV

ERROR DETECTION COMPARATOR

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS2954

TYPICAL PERFORMANCE CHARACTERISTICS

0

40

100

60

160

0 1 2 3 4 5 6 7 8

INPUT VOLTAGE (V)

Quiescent Current

QUIESCENT CURRENT (µA)

125

250

Input Current

25

50

75

100

150

175

200

225

INPUT VOLTAGE (V)

INPUT CURRENT (µA)

5V OUTPUT

-75 0 25 50 75 100 125

5.06

5.0

150

OUTPUT VOLTAGE (V)

Temperature Drift of 3
Representative Units

TEMPERATURE (° C)

5.04

4.98

4.94

-50 -25

1

50 100

250

LOAD CURRENT (mA)

GROUND CURRENT (mA)

0.1

1

10

20

Quiescent Current

Dropout Characteristics

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

IO=1mA

0

90

270

Input Current

15

30

45

75

120

150

180

210

INPUT VOLTAGE (V)

INPUT CURRENT (mA)

-75

0 25 50 75 100 125

120

90

150

QUIESCENT CURRENT (µA)

Quiescent Current

TEMPERATURE (° C)

100

70

60

-50 -25

IL= 100µA

-75

0 25 50 75 100 12535150

QUIESCENT CURRENT (mA)

Quiescent Current

TEMPERATURE (° C)

25

15

5

-50 -25

IL= 250mA

50

80

110

20

80

140
120

0

6

15

9

24

0 1 2 3 4 5 6 7 8

INPUT VOLTAGE (V)

Quiescent Current

QUIESCENT CURRENT (mA)

3

12

21
18

0

1

2

3 4 5 6 1 2 3 4 5 6 7 8 9 100

0

1

2

3

4

5

6

0

1 2 3 4 5 6 7 8 9 100

60

240

5.02

4.96

5V OUTPUT

5V OUTPUT5V OUTPUT 5V OUTPUT

5V OUTPUT

5V OUTPUT

5V OUTPUT

IL= 1 mA

IL= 250mA

IO=250mA

IL= 0mA

VIN= 6V

VIN= 6V

IO=250mA

0.2%

RL=

∞

30

20

10

150 200