NSC LP3984IBP-1.5, LP3984I-1.8MWC, LP3984I-1.8MDC, LP3984I-1.5MWC, LP3984I-1.5MDC Datasheet

LP3984
Micropower, 150mA Ultra Low-Dropout CMOS Voltage
Regulator in Subminiature 4-I/O micro SMD Package

General Description

The LP3984 is designed for portable and wireless applica­tions with demanding performance and space requirements.

The LP3984’s performance is optimized for battery powered
systems to deliver extremely low dropout voltage and low
quiescent current. Regulator ground current increases only
slightly in dropout, further prolonging the battery life.

Power supply rejection is better than 60 dB at low frequen­cies and starts to roll off at 10 kHz. High power supply
rejection is maintained down to lower input voltage levels
common to battery operated circuits.

The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 150 mA,
from a 2.5V to 6V input, consuming less than 1.2µA in
disable mode and has fast turn-on time less than 20µs.

The LP3984 is available in micro SMD and 5 pin SOT-23
package. Performance is specified for −40˚C to +125˚C
temperature range and is available in 1.5V, 1.8V, 2.0V, and

3.1V output voltages. For other output voltage options from

1.5V to 3.5V, please contact National Semiconductor sales
office.

Key Specifications

n 2.5 to 6.0V input range
n 150mA guaranteed output

n 60dB PSRR at 1kHz, 40dB at 10kHz

@

3.1V

IN

n ≤1.2µA quiescent current when shut down
n Fast Turn-On time: 20 µs (typ.)
n 75mV typ dropout with 150mA load
n −40 to +125˚C junction temperature range for operation
n 1.5V, 1.8V, 2.0V, and 3.1V

Features

n Miniature 4-I/O micro SMD and SOT-23-5 package
n Logic controlled enable
n Stable with tantalum capacitors
n 1 µF Tantalum output capacitor
n Fast turn-on
n Thermal shutdown and short-circuit current limit

Applications

n CDMA cellular handsets
n Wideband CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances

Typical Application Circuit

20020402

Note: Pin Numbers in parenthesis indicate micro SMD package.

November 2001

LP3984 Micropower, 150mA Ultra Low-Dropout CMOS Voltage Regulator in Subminiature 4-I/O

micro SMD Package

© 2001 National Semiconductor Corporation DS200204 www.national.com

Block Diagram

20020401

Pin Descriptions

Name µSMD SOT Function

V

EN

4 3 Enable Input Logic, Enable High
GND 1 2 Common Ground
V

OUT

2 5 Output Voltage of the LDO

V

IN

3 1 Input Voltage of the LDO

N.C. 4 No Connection

Connection Diagrams

SOT-23-5 Package

20020407

Top View

See NS Package Number MF05A

micro SMD, 4 Bump Package

20020470

Top View

See NS Package Number BPA04

Note: The actual physical placement of the package marking will vary from

part to part. The package marking will designate the date code. Package
marking does not correlate to device type in any way.

LP3984

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Ordering Information

For micro SMD Package

Output

Voltage (V)

Grade

LP3984 Supplied as 250

Units, Tape and Reel

LP3984 Supplied as 3000

Units, Tape and Reel

1.5 STD LP3984IBP-1.5 LP3984IBPX-1.5

1.8 STD LP3984IBP-1.8 LP3984IBPX-1.8

2.0 STD LP3984IBP-2.0 LP3984IBPX-2.0

3.1 STD LP3984IBP-3.1 LP3984IBPX-3.1

For SOT Package

Output

Voltage (V)

Grade

LP3984 Supplied as 1000

Units, Tape and Reel

LP3984 Supplied as 3000

Units, Tape and Reel

Package Marking

1.5 STD LP3984IMF-1.5 LP3984IMFX-1.5 LEAB

1.8 STD LP3984IMF-1.8 LP3984IMFX-1.8 LEBB

2.0 STD LP3984IMF-2.0 LP3984IMFX-2.0 LECB

3.1 STD LP3984IMF-3.1 LP3984IMFX-3.1 LEDB

LP3984

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Absolute Maximum Ratings (Notes 1,

2)

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

V

IN,VOUT,VEN

−0.3 to 6.5V
Junction Temperature 150˚C
Storage Temperature −65˚C to +150˚C
Lead Temp. (Note 3) 235˚C
Pad Temp. (Note 3) 235˚C
Power Dissipation (Note 4)

θ

JA

(SOT23-5)

θ

JA

(micro SMD)

220˚C/W
340˚C/W

Maximum Power Dissipation

SOT23-5
Micro SMD

364mW
235mW

ESD Rating(Note 5)

Human Body Model
Machine Model

2kV

200V

Operating Ratings (Notes 1, 2)

V

IN

2.5 to 6V

V

EN

0to(VIN+ 0.3V)
Junction Temperature −40˚C to +125˚C
Maximum Power Dissipation (Note 6)

SOT23-5
micro SMD

250mW
160mW

Electrical Characteristics

Unless otherwise specified: VIN= 2.5V for 1.5, 1.8, & 2.0V options, VIN=V

OUT

+ 0.5 for output options higher than 2.5V, CIN=

1 µF, I

OUT

= 1mA, C

OUT

= 1 µF, tantalum. Typical values and limits appearing in standard typeface are for TJ= 25˚C. Limits

appearing in boldface type apply over the entire junction temperature range for operation, −40˚C to +125˚C. (Note 7) (Note 8)

Symbol Parameter Conditions Typ

Limit

Units

Min Max

∆V

OUT

Output Voltage
Tolerance

−1.2

−2.0

1.2

2.0

%of

V

OUT(nom)

Line Regulation Error VIN= 2.5V to 4.5V for 1.5, 1.8, 2.0V

options
V

IN

=(V

OUT

+ 0.5V) to 4.5V for

Voltage options higher than 2.5V

0.05 −0.15 0.15
%/V

Load Regulation Error
(Note 9)

I

OUT

= 1 mA to 150 mA

LP3984IM5 (SOT23-5)

0.002 0.005
%/mA

LP3984IBP (micro SMD) 0.0009 0.002

PSRR Power Supply Rejection Ratio

V

IN=VOUT(nom)

+ 0.2V,
f = 1 kHz,
I

OUT

=50mA(

Figure 2

)

60

dB

V

IN=VOUT(nom)

+ 0.2V,
f = 10 kHz,
I

OUT

=50mA(

Figure 2

)

40

I

Q

Quiescent Current VEN= 1.4V, I

OUT

= 0 mA 80 125

µAV

EN

= 1.4V, I

OUT

= 0 to 150 mA 110 150

V

EN

= 0.4V 0.005 1.2

Dropout Voltage (Note 10) I

OUT

=1mA 0.6 2.5

mV

I

OUT

=50mA 25 40

I

OUT

= 100 mA 50 80

I

OUT

= 150 mA 75 120

I

SC

Short Circuit Current Limit Output Grounded

(Steady State)

600

mA

I

OUT(PK)

Peak Output Current V

OUT

≥ V

OUT(nom)

- 5% 600 300 mA

T

ON

Turn-On Time
(Note 11)

20

µs

e

n

Output Noise Voltage BW = 10 Hz to 100 kHz,

C

OUT

= 1µF tant.

90 µVrms

I

EN

Maximum Input Current at EN VEN= 0.4 and VIN= 6.0

±

1nA

LP3984

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