National Semiconductor LP5951 Technical data

LP5951
Micropower, 150mA Low-Dropout CMOS Voltage
Regulator

LP5951 Micropower, 150mA Low-Dropout CMOS Voltage Regulator

August 2006

General Description

The LP5951 regulator is designed to meet the requirements
of portable, battery-powered systems providing a regulated
output voltage and low quiescent current. When switched to
shutdown mode via a logic signal at the Enable pin, the
power consumption is reduced to virtually zero.

The LP5951 is designed to be stable with small 1µF/1.5µF
ceramic capacitors.

The LP5951 also features internal protection against short­circuit currents and over-temperature conditions.

Performance is specified for a -40˚C to 125˚C temperature
range.

The device is available in SOT23-5 and SC70-5 package.
The device is available in fixed output voltages in the range

of 1.3V to 3.3V. For availability, please contact your local
NSC sales office.

Typical Application Circuit

Features

n Excellent line transient response:±2mV typ.
n Excellent PSRR: -60dB at 1kHz typ.
n Low quiescent current of 29µA typ.
n 1.8 to 5.5V input voltage range
n Small SC70-5 and SOT23-5 packages
n Fast turn-on time of 30µs typ.

<

n Typ.
n Guaranteed 150mA output current
n Output voltage range: 1.3V to 3.3V
n Logic controlled enable 0.4V/0.9V
n Good load transient response of 50mVpp typ.
n Thermal-overload and short-circuit protection
n -40˚C to +125˚C junction temperature range

1nA quiescent current in shutdown

Applications

n General purpose

20136201

© 2006 National Semiconductor Corporation DS201362 www.national.com

Connection Diagrams

LP5951

5-Lead Small Outline Package

SOT23-5 (MF)

5-Lead Small Outline Package

SC70-5 (MG)

Top View

20136202

See NS Package Number MF05A

Top View

See NS Package Number MAA05A

20136203

Pin Descriptions

Pin
Number Pin Name Description

1V

2 GND Ground

3 EN Enable pin logic input: Low = shutdown, High = normal operation. This pin should not be left

4 NC No internal connection

5V

IN

OUT

Input Voltage. Input range: 1.8V to 5.5V

floating.

Regulated output voltage

Order Information

For 5-Lead Small Outline Package SOT23-5 (MF)

Output

Voltage (V)

1.3

1.5

1.8

2.0

2.5

2.8

3.0

3.3

LP5951 Supplied as 1000 Units,

Tape and Reel

LP5951MF-1.3 LP5951MFX-1.3 LKRB

LP5951MF-1.3 LP5951MFX-1.3 NOPB LKRB

LP5951MF-1.5 LP5951MFX-1.5 LKAB

LP5951MF-1.5 LP5951MFX-1.5 NOPB LKAB

LP5951MF-1.8 LP5951MFX-1.8 LKBB

LP5951MF-1.8 LP5951MFX-1.8 NOPB LKBB

LP5951MF-2.0 LP5951MFX-2.0 LKCB

LP5951MF-2.0 LP5951MFX-2.0 NOPB LKCB

LP5951MF-2.5 LP5951MFX-2.5 LKEB

LP5951MF-2.5 LP5951MFX-2.5 NOPB LKEB

LP5951MF-2.8 LP5951MFX-2.8 LKFB

LP5951MF-2.8 LP5951MFX-2.8 NOPB LKFB

LP5951MF-3.0 LP5951MFX-3.0 LKGB

LP5951MF-3.0 LP5951MFX-3.0 NOPB LKGB

LP5951MF-3.3 LP5951MFX-3.3 LKHB

LP5951MF-3.3 LP5951MFX-3.3 NOPB LKHB

LP5951 Supplied as 3000 Units,

Tape and Reel Flow

Package

Marking

www.national.com 2

Order Information (Continued)

For 5-Lead Small Outline Package SC70-5 (MG)

Output

Voltage (V)

1.3

1.5

1.8*

2.0*

2.5*

2.8*

3.0*

3.3*

LP5951 Supplied as 1000 Units,

Tape and Reel

LP5951MG-1.3 LP5951MGX-1.3 L23

LP5951MG-1.3 LP5951MGX-1.3 NOPB L23

LP5951MG-1.5 LP5951MGX-1.5 L2B

LP5951MG-1.5 LP5951MGX-1.5 NOPB L2B

LP5951MG-1.8 LP5951MGX-1.8 L3B

LP5951MG-1.8 LP5951MGX-1.8 NOPB L3B

LP5951MG-2.0 LP5951MGX-2.0 L4B

LP5951MG-2.0 LP5951MGX-2.0 NOPB L4B

LP5951MG-2.5 LP5951MGX-2.5 L5B

LP5951MG-2.5 LP5951MGX-2.5 NOPB L5B

LP5951MG-2.8 LP5951MGX-2.8 L6B

LP5951MG-2.8 LP5951MGX-2.8 NOPB L6B

LP5951MG-3.0 LP5951MGX-3.0 L7B

LP5951MG-3.0 LP5951MGX-3.0 NOPB L7B

LP5951MG-3.3 LP5951MGX-3.3 LAB

LP5951MG-3.3 LP5951MGX-3.3 NOPB LAB

LP5951 Supplied as 3000 Units,

Tape and Reel Flow

LP5951

Package

Marking

* Not yet released. For availability please contact your local NSC sales office.

Note: The package marking on the backside of the component designates the date code and a NSC internal code for die traceability. It will vary considerably.

SOT23-5: ZWTT

SC70-5: WTT

with: Z: 1 Digit Assembly Plant Code, W: 1 Digit Date Code, TT: 2 Digit Dierun Code

www.national.com3

Absolute Maximum Ratings (Notes 2,

1)

LP5951

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

pin: Voltage to GND -0.3V to 6.5V

V

IN

EN pin: Voltage to GND -0.3V to (V

with 6.5V max

Continuous Power
Dissipation(Note 3) Internally Limited

Junction Temperature (T

Storage Temperature Range -65˚C to + 150˚C

) 150˚C

J-MAX

+0.3V)

IN

Operating Ratings (Notes 1, 2)

Input Voltage Range (V

V

Input Voltage 0 to (VIN+ 0.3V)

EN

Junction Temperature (T

Ambient Temperature (T

) 1.8V to 5.5V

IN

) Range -40˚C to + 125˚C

J

) Range (Note 5)

A

Thermal Properties

Junction-to-Ambient Thermal
Resistance (θ

SOT23-5 Package: 220˚C/W

SC70-5 Package: 415˚C/W

), (Note 6)

JA

Package Peak Reflow
Temperature (10-20 sec.) 240˚C

Package Peak Reflow
Temperature (Pb-free, 10-20 sec.) 260˚C

ESD Rating(Note 4)

Human Body Model: 2.0kV

Machine Model 200V

ESD Caution Notice

National Semiconductor recommends that all integrated circuits be handled with appropriate precautions. Failure to observe
proper ESD handling techniques can result in damage.

Electrical Characteristics(Notes 2, 7)

Typical values and limits appearing in standard typeface are for TA= 25˚C. Limits appearing in boldface type apply over the
full operating temperature range: -40˚C ≤ T

= 0.9V.

V

EN

≤ +125˚C. Unless otherwise noted, VIN=V

J

OUT(NOM)

Symbol Parameter Condition Typ

V

∆V

V

I

Q

I

SC

IN

OUT

DO

Input Voltage VIN≥ V

Output Voltage
Tolerance

Line Regulation Error V

Load Regulation Error I

Output Voltage Dropout
(Note 10)

OUT(NOM)

I

= 1mA

OUT

-30˚C ≤ T

IN=VOUT(NOM)

I

OUT

OUT

I

OUT

V

OUT

V

OUT

J

= 1mA

= 1mA to 150mA -0.01 %/mA

= 150mA

≥ 2.5V

<

2.5V

Quiescent Current VEN= 0.9V, I

= 0.9V, I

V

EN

=0V

V

EN

Output Current

VIN=V

OUT(NOM)

+V

DO

≤ +125˚C

+ 1V to 5.5V

0.1 %/V

200 250

LOAD

LOAD

=0
= 150mA

29
33

0.005

+ 1V 400 150 mA

(short circuit)

PSRR Power Supply

Rejection Ratio

E

N

Output Noise BW = 10Hz - 100kHz 125 µV

Sine modulated V
f = 100Hz
f = 1kHz
f = 10kHz

IN

60
60
50

TSD Thermal Shutdown 160 ˚C

Temperature Hysteresis 20 ˚C

+ 1V, CIN= 1µF, C

OUT

Limit

UnitsMin Max

1.8 5.5 V

-2.0

-3.5

2.0

3.5

350

55
70

1

= 1µF,

%
%

mV
mV

µA
µA
µA

dB
dB
dB

RMS

www.national.com 4