LP2985LV.pdf

May 2004

2.3V

Designed for Use with Very Low ESR Output Capacitors

General Description

The LP2985LV is a 150 mA, fixed-output voltage regulator

designed to providehigh performance and low noise in ap-

plications requiring output voltages < 2.3V.

Using an optimized VIP ™ (Vertically Integrated PNP) pro-

cess, the LP2985LV delivers unequalled performance in all

specifications critical to battery-powered designs:

Ground Pin Current: Typically 825 µA @ 150 mA load, and

75 µA @ 1 mA load.

Enhanced Stability: The LP2985LV is stable with output

capacitor ESR as low as 5 m Ω , which allows the use of

ceramic capacitors on the output.

Sleep Mode: Less than 1 µA quiescent current when ON/

OFF pin is pulled low.

Smallest Possible Size: micro SMD package uses absolute

minimum board space.

Precision Output: 1% tolerance output voltages available

(A grade).

Low Noise: By adding a 10 nF bypass capacitor, output

noise can be reduced to 30 µV (typical).

≤

Features

n Guaranteed 150 mA output current

n Smallest possible size (micro SMD)

n Requires minimum external components

n Stable with low-ESR output capacitor

n < 1 µA quiescent current when shut down

n Low ground pin current at all loads

n Output voltage accuracy 1% (A Grade)

n High peak current capability

n Wide supply voltage range (16V max)

n Low Z OUT : 0.3

Applications

n Cellular Phone

n Palmtop/Laptop Computer

n Personal Digital Assistant (PDA)

n Camcorder, Personal Stereo, Camera

Block Diagram

10129501

VIP ™ is a trademark of National Semiconductor Corporation.

DS101295

www.national.com

LP2985LV

Micropower 150 mA Low-Noise Low-Dropout Regulator

in SOT-23 and micro SMD packages for Applications

with Output Voltages

typical (10 Hz to 1 MHz)

n Overtemperature/overcurrent protection

n −40˚C to +125˚C junction temperature range

n Custom voltages available

Ω

Basic Application Circuit

10129502

*ON/OFF input must be actively terminated. Tie to V IN if this function is not to be used.

**Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints).

***Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low leakage current (see Application Hints).

Connection Diagrams

5-Lead Small Outline Package (M5)

micro SMD, 5 Bump Package (BPA05 & BLA05)

10129503

Top View

See NS Package Number MF05A

For ordering information see Table 1

10129523

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

part to part. Package marking contains date code and lot traceability

information, and will vary considerably. Package marking does not correlate

to device type.

Top View

See NS Package Number BPA05 & BLA05

Pin Descrption

Name

Pin Number

Function

SOT-23

micro SMD

V IN

Input Voltage

GND

Common Ground (device substrate)

ON/OFF

Logic high enable input

BYPASS

Bypass capacitor for low noise operation

V OUT

Regulated output voltage

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Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage (V)

Grade

Order Information

Package

Marking

Supplied as:

5-Lead Small Outline Package (M5)

1.35

LP2985AIM5X-135

LF7A

3000 Units on Tape and Reel

1.35

LP2985AIM5-135

LF7A

1000 Units on Tape and Reel

1.35

STD

LP2985IM5X-135

LF7B

3000 Units on Tape and Reel

1.35

STD

LP2985IM5-135

LF7B

1000 Units on Tape and Reel

1.5

LP2985AIM5X-1.5

LCHA

3000 Units on Tape and Reel

1.5

LP2985AIM5-1.5

LCHA

1000 Units on Tape and Reel

1.5

STD

LP2985IM5X-1.5

LCHB

3000 Units on Tape and Reel

1.5

STD

LP2985IM5-1.5

LCHB

1000 Units on Tape and Reel

1.8

LP2985AIM5X-1.8

LAYA

3000 Units on Tape and Reel

1.8

LP2985AIM5-1.8

LAYA

1000 Units on Tape and Reel

1.8

STD

LP2985IM5X-1.8

LAYB

3000 Units on Tape and Reel

1.8

STD

LP2985IM5-1.8

LAYB

1000 Units on Tape and Reel

2.0

LP2985AIM5X-2.0

LCDA

3000 Units on Tape and Reel

2.0

LP2985AIM5-2.0

LCDA

1000 Units on Tape and Reel

2.0

STD

LP2985IM5X-2.0

LCDB

3000 Units on Tape and Reel

2.0

STD

LP2985IM5-2.0

LCDB

1000 Units on Tape and Reel

micro SMD, 5 Bump Package (BPA05 - 170 µm ball)

1.5

LP2985AIBP-1.5

250 Units on Tape and Reel

1.5

LP2985AIBPX-1.5

3000 Units on Tape and Reel

1.5

STD

LP2985IBP-1.5

250 Units on Tape and Reel

1.5

STD

LP2985IBPX-1.5

3000 Units on Tape and Reel

1.8

LP2985AIBP-1.8

250 Units on Tape and Reel

1.8

LP2985AIBPX-1.8

3000 Units on Tape and Reel

1.8

STD

LP2985IBP-1.8

250 Units on Tape and Reel

1.8

STD

LP2985IBPX-1.8

3000 Units on Tape and Reel

micro SMD, 5 Bump Package (BLA05 - 300 µm ball)

1.8

LP2985AIBL-1.8

250 Units on Tape and Reel

1.8

LP2985AIBLX-1.8

3000 Units on Tape and Reel

1.8

STD

LP2985IBL-1.8

250 Units on Tape and Reel

1.8

STD

LP2985IBLX-1.8

3000 Units on Tape and Reel

micro SMD, 5 Bump Package (TPA05 - 170 µm ball)

1.8

LP2985AITP-1.8

250 Units on Tape and Reel

1.8

LP2985AITPX-1.8

3000 Units on Tape and Reel

1.8

STD

LP2985ITP-1.8

250 Units on Tape and Reel

1.8

STD

LP2985ITPX-1.8

3000 Units on Tape and Reel

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Storage Temperature Range

Input Supply Voltage (Survival)

−0.3V to +16V

Input Supply Voltage (Operating)

2.2V to +16V

Shutdown Input Voltage (Survival)

−0.3V to +16V

Output Voltage (Survival, (Note 4))

−0.3V to +9V

−65˚C to +150˚C

I OUT (Survival)

Short Circuit

Protected

Operating Junction Temperature

Range

−40˚C to +125˚C

Input-Output Voltage (Survival,

−0.3V to +16V

Lead Temp. (Soldering, 5 sec.)

260˚C

(Note 5))

ESD Rating (Note 2)

2 kV

Power Dissipation (Note 3)

Internally Limited

Electrical Characteristics (Note 10)

Limits in standard typeface are for T J = 25˚C. and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: V IN =V O (NOM) + 1V, I L = 1 mA, C IN = 1 µF, C OUT = 4.7 µF, V ON/OFF = 2V.

LP2985AI-X.X

LP2985I-X.X

Symbol

Parameter

Conditions

Typ

(Note 6)

Units

Min

Max

Min

Max

∆ V O

Output Voltage

Tolerance

I L = 1 mA

−1.0

1.0

−1.5

1.5

1mA ≤ I L ≤ 50 mA

−1.5

1.5

−2.5

2.5

−2.5

2.5

−3.5

3.5

%V NOM

1mA

≤

I L ≤

150 mA

−2.5

2.5

−3.0

3.0

−3.5

3.5

−4.0

4.0

Output Voltage

V O (NOM)+1V

≤

V IN ≤

16V

0.007

0.014

%/V

Line Regulation

0.032

I GND

Ground Pin Current

I L = 0

125

I L = 1 mA

110

170

I L = 10 mA

120

220

400

µA

I L = 50 mA

300

500

900

I L = 150 mA

825

1200

2000

V ON/OFF < 0.3V

0.01

0.8

V ON/OFF < 0.15V

0.05

V IN (min)

Minimum Input Voltage

Required To maintain

Output Regulation

(Note 9)

2.05

2.20

IL = 50mA

120

150

250

150

250

V IN -V OUT

Dropout Voltage

(Note 9)

IL = 150mA

280

350

600

350

600

V ON/OFF

ON/OFF Input Voltage

(Note 7)

High = O/P ON

1.4

1.6

Low = O/P OFF

0.55

0.15

I ON/OFF

ON/OFF Input Current V ON/OFF = 0

0.01

−2

µA

V ON/OFF =5V

e n

Output Noise

BW = 300 Hz to 50 kHz,

Voltage (RMS)

C OUT =10µF

µV

C BYPASS =10nF

V OUT = 1.8V

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Electrical Characteristics (Note 10) (Continued)

Limits in standard typeface are for T J = 25˚C. and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: V IN =V O (NOM) + 1V, I L = 1 mA, C IN = 1 µF, C OUT = 4.7 µF, V ON/OFF = 2V.

LP2985AI-X.X

LP2985I-X.X

Symbol

Parameter

Conditions

Typ

(Note 6)

Units

Min

Max

Min

Max

Ripple Rejection

f = 1 kHz, C BYPASS =10nF

C OUT =10µF

I O (SC)

Short Circuit Current

R L = 0 (Steady State)

400

(Note 8)

I O (PK)

Peak Output Current

V OUT ≥

V o (NOM) −5%

350

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the

device outside of its rated operating conditions.

Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV.

Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T J (MAX), the junction-to-ambient thermal resistance,

θ J-A ,

J-A for the SOT-23 package is 220˚C/W in a typical PC board mounting. Exceeding the maximum allowable dissipation will cause excessive die

temperature, and the regulator will go into thermal shutdown.

Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2985LV output must be diode-clamped to ground.

Note 5: The output PNP structure contains a diode between the V IN to V OUT terminals that is normally reverse-biased. Reversing the polarity from V IN to V OUT will

turn on this diode, and possibly damage the device (See Application Hints).

Note 6: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).

Note 7: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 8: The LP2985LV has foldback current limiting which allows a high peak current when V OUT > 0.5V, and then reduces the maximum output current as V OUT

is forced to ground (see Typical Performance Characteristics curves).

Note 9: V IN must be the greater of 2.2V or V OUT(nom) + Dropout Voltage to maintain output regulation. Dropout Voltage is defined as the input to output differential

at which the output voltage drops 2% below ther value measured with a 1V differential.

Note 10: Exposing the micro SMD device to direct sunlight will cause misoperation. See Application Hints for additional information.

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and the ambient temperature, T A . The maximum allowable power dissipation at any ambient temperture is calculated using:

Where the value of

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