LP2985IM5X-2.8 データシート ( Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low )

部品番号

LP2985IM5X-2.8

部品説明

Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

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National Semiconductor

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March 2000

LP2985

Micropower 150 mA Low-Noise Ultra Low-Dropout

Regulator

Designed for Use with Very Low ESR Output Capacitors

General Description

The LP2985 is a 150 mA, fixed-output voltage regulator de-

signed to provide ultra low-dropout and low noise in battery

powered applications.

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

cess, the LP2985 delivers unequalled performance in all

specifications critical to battery-powered designs:

Dropout Voltage: Typically 300 mV @ 150 mA load, and

7 mV @ 1 mA load.

Ground Pin Current: Typically 850 µA @ 150 mA load, and

75 µA @ 1 mA load.

Enhanced Stability: The LP2985 is stable with output ca-

pacitor ESR as low as 5 mΩ, 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: SOT-23 and micro SMD packages

use 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).

Multiple voltage options, from 2.5V to 5.0V, are available as

standard products. Consult factory for custom voltages.

Features

n Ultra low dropout voltage

n Guaranteed 150 mA output current

n Smallest possible size (SOT-23, micro SMD package)

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 ZOUT: 0.3Ω typical (10 Hz to 1 MHz)

n Overtemperature/overcurrent protection

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

n Custom voltages available

Applications

n Cellular Phone

n Palmtop/Laptop Computer

n Personal Digital Assistant (PDA)

n Camcorder, Personal Stereo, Camera

Block Diagram

VIP™ is a trademark of National Semiconductor Corporation.

DS100140-1

www.national.com

1 Page

Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage

(V)

Grade

5-Lead Small Outline Package (M5)

2.5 A

2.5 STD

2.7 A

2.7 STD

2.8 A

2.8 STD

2.9 A

2.9 STD

3.0 A

3.0 STD

3.1 A

3.1 STD

3.2 A

3.2 STD

3.3 A

3.3 STD

3.5 A

3.5 STD

3.6 A

3.6 STD

3.8 A

3.8 STD

4.0 A

Order Information

LP2985AIM5X-2.5

LP2985AIM5-2.5

LP2985IM5X-2.5

LP2985IM5-2.5

LP2985AIM5X-2.7

LP2985AIM5-2.7

LP2985IM5X-2.7

LP2985IM5-2.7

LP2985AIM5X-2.8

LP2985AIM5-2.8

LP2985IM5X-2.8

LP2985IM5-2.8

LP2985AIM5X-2.9

LP2985AIM5-2.9

LP2985IM5X-2.9

LP2985IM5-2.9

LP2985AIM5X-3.0

LP2985AIM5-3.0

LP2985IM5X-3.0

LP2985IM5-3.0

LP2985AIM5X-3.1

LP2985AIM5-3.1

LP2985IM5X-3.1

LP2985IM5-3.1

LP2985AIM5X-3.2

LP2985AIM5-3.2

LP2985IM5X-3.2

LP2985IM5-3.2

LP2985AIM5X-3.3

LP2985AIM5-3.3

LP2985IM5X-3.3

LP2985IM5-3.3

LP2985AIM5X-3.5

LP2985AIM5-3.5

LP2985IM5X-3.5

LP2985IM5-3.5

LP2985AIM5X-3.6

LP2985AIM5-3.6

LP2985IM5X-3.6

LP2985IM5-3.6

LP2985AIM5X-3.8

LP2985AIM5-3.8

LP2985IM5X-3.8

LP2985IM5-3.8

LP2985AIM5X-4.0

Package

Marking

LAUA

LAUB

LALA

LALB

L0KA

L0KB

LAXA

LAXB

L0OA

L0OB

L0PA

L0PB

L0QA

L0QB

L0RA

L0RB

LAIA

LAIB

L0SA

L0SB

L0YA

L0YB

L0TA

Supplied as:

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

1000 Units on Tape and Reel

3000 Units on Tape and Reel

3 www.national.com

3Pages

Electrical Characteristics (Continued)

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

less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.

LP2985AI-X.X

LP2985I-X.X

Symbol

Parameter

Conditions

Typ (Note 6)

(Note 6)

Units

Min Max Min Max

Ripple Rejection

f = 1 kHz, CBYPASS = 10 nF

COUT = 10 µF

IO(SC)

Short Circuit Current

RL = 0 (Steady State)

(Note 9)

400

IO(PK)

Peak Output Current VOUT ≥ Vo(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 is 1 kV.

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

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

Where the value of θJ-A for the SOT-23 package is 220˚C/W in a typical PC board mounting and the micro SMD package is 320˚C/W. Exceeding the maximum al-

lowable 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 LP2985 output must be diode-clamped to ground.

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

turn on this diode.

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: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.

Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 9: The LP2985 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is

forced to ground (see Typical Performance Characteristics curves).

www.national.com

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