lp3988itlx-2.85 National Semiconductor Corporation, lp3988itlx-2.85 Datasheet

lp3988itlx-2.85

Manufacturer Part Number

lp3988itlx-2.85

Description

Micropower, 150ma Ultra Low-dropout Cmos Voltage Regulator With Power Good

Manufacturer

National Semiconductor Corporation

Datasheet

1.LP3988ITLX-2.85.pdf (11 pages)

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Company:

BOSTOCK HK LIMITED

Part Number:

lp3988itlx-2.85/NOPB

Manufacturer:

Texas Instruments

Quantity:

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LP3988

Micropower, 150mA Ultra Low-Dropout CMOS Voltage

Regulator With Power Good

General Description

The LP3988 is a 150mA low dropout regulator designed

specially to meet requirements of Portable battery-

applications. The LP3988 is designed to work with a space

saving, small 1µF ceramic capacitor. The LP3988 features

an Error Flag output that indicates a faulty output condition.

The LP3988’s performance is optimized for battery powered

systems to deliver low noise, extremely low dropout voltage

and low quiescent current. Regulator ground current in-

creases only slightly in dropout, further prolonging the bat-

tery life.

Power supply rejection is better than 60 dB at low frequen-

cies 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 µA in disable

mode and has fast turn-on time less than 200µs.

The LP3988 is available 5 pin SOT-23 package and 5 bump

thin micro SMD package. Performance is specified for −40˚C

to +125˚C temperature range and is available in 1.85, 2.5,

2.6, 2.85, 3.0 and 3.3V output voltages.

Key Specifications

n 2.5 to 6.0V input range

n 150mA guaranteed output

Typical Application Circuit

DS200205

n 40dB PSRR at 10kHz

n ≤1 µA quiescent current when shut down

n Fast Turn-On time: 100 µs (typ.)

n 80 mV typ dropout with 150mA load

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

n 1.85V, 2.5V, 2.6V, 2.85V, 3.0V, and 3.3V

Features

n 5 bump thin micro SMD package

n SOT-23-5 package

n Power-good flag output

n Logic controlled enable

n Stable with ceramic and high quality tantalum capacitors

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

n Tiny 3.3V

20020502

5% to 2.85V, 150mA converter

www.national.com

August 2004

Related parts for lp3988itlx-2.85

lp3988itlx-2.85 Summary of contents

Page 1

... Key Specifications n 2.5 to 6.0V input range n 150mA guaranteed output Typical Application Circuit © 2004 National Semiconductor Corporation n 40dB PSRR at 10kHz n ≤1 µA quiescent current when shut down n Fast Turn-On time: 100 µs (typ typ dropout with 150mA load n − ...

Page 2

Block Diagram Pin Descriptions Name V EN GND V OUT V IN Power Good Connection Diagrams SOT-23-5 Package (MF) Top View See NS Package Number MF05A www.national.com micro SMD SOT A1 3 Enable Input Logic, Enable High B2 2 Common ...

Page 3

... LP3988IMF-2.6 LP3988IMFX-2.6 LP3988IMF-2.85 LP3988IMFX-2.85 LP3988IMF-3.0 LP3988IMFX-3.0 LP3988IMF-3.3 LP3988IMFX-3.3 5 Bump Thin Micro SMD Package LP3988 Supplied as 250 Units, Tape and Reel LP3988ITL-1.85 LP3988ITL-2.6 LP3988ITL-2.85 3 Package Marking LFSB LDJB LDLB LFAB LH5B LP3988 Supplied as 3000 Units, Tape and Reel LP3988ITLX-1.85 LP3988ITLX-2.6 LP3988ITLX-2.85 www.national.com ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications PowerGood(applies OUT EN only to micro SMD) Junction Temperature Storage Temperature Lead Temp, ...

Page 5

Electrical Characteristics Unless otherwise specified 1.8V appearing in standard typeface are for T range for operation, −40˚C to +125˚C. (Note 6) (Note 7) Symbol Parameter V Logic Low Input threshold IL V Logic High Input threshold ...

Page 6

FIGURE 2. Line Transient response Input Perturbation Typical Performance Characteristics = V + 0.2V 25˚C, Enable pin is tied to V OUT A Ripple Rejection Ratio (LP3988-2.6) www.national.com 20020522 FIGURE 1. Power Good Flag Timing 20020508 FIGURE 3. ...

Page 7

Typical Performance Characteristics V + 0.2V 25˚C, Enable pin is tied to V OUT A Power-Good Response Time (LP3988-2.85) (flag pin pulled to V through a 100KΩ resistor) OUT Power-Good Response Time (LP3988-2.85) (flag pin pulled to V ...

Page 8

Typical Performance Characteristics V + 0.2V 25˚C, Enable pin is tied to V OUT A Enable Response Load Transient Response www.national.com Unless otherwise specified (Continued) IN 20020518 Load Transient Response 20020520 ...

Page 9

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, the LP3988 requires external capacitors for regulator stability. The LP3988 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. ...

Page 10

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 5-Lead Small Outline Package (MF) NS Package Number MF05A Thin micro SMD, 5 bump Package (TLA05) NS Package Number TLA05AEA The dimensions for X1, X2 and X3 are as given ...

Page 11

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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