LM26 판매점 - 400mA Sub-miniature/ Programmable/ Step-Down DC-DC Converter for Ultra Low-Voltage Circuits

LM26 반도체 회로 부품 판매점

400mA Sub-miniature/ Programmable/ Step-Down DC-DC Converter for Ultra Low-Voltage Circuits

National Semiconductor

April 2001

LM2601

Adapter Interface Circuit

General Description

The Adapter Interface Circuit (AIC) is used to sense the

presence of an external power source for a portable com-

puter. It notifies the computer if a source is present and

indicates if the source is appropriate for charging battery

packs inside the computer. The AIC also senses an adapter

current and its direction. AIC isolates the adapter and signals

the computer when peak current threshold is exceeded.

LM2601 drives P-channel FETs. No high current rated

Schottky diode is required to implement an adapter switcho-

ver circuit. This significantly decreases additional heat dissi-

pation during simultaneous fast battery charging while run-

ning a computer, particularly in Maximum Performance

mode of operation

Features

n Detects an AC-DC adapter suitable for battery charging

or an airplane or car power line adapter that should not

be used for battery charging

n Allows the implementation of intelligent switchover

circuits for portable systems

n LM2601 shuts down automatically when adapter is

removed

n Low leakage current from battery when not powered

n Drives P-channel FETs, no Schottky diodes are required

n No reverse inrush current from battery into the adapter

output capacitance

n Allows for battery capacity gas-gauge calibration under

system software/firmware control

n Adapter over current threshold programmable with

external resistors

n Wide input range: 5V - 24V

n Available in TSSOP-14 package

Applications

n Portable Computers

n Portable IAs (Internet Appliances, Information

Appliances)

n Other Battery Powered Devices

Block Diagram

10130901

www.national.com

Pin Configuration

TSSOP-14

10130902

Ordering Information

Order Number

LM2601MTC

LM2601MTCX

Package Number

MTC14

Package Type

TSSOP-14

* Partial Rails are available, there is no minimum order quantity. Tape and Reel is supplied as full reels only.

Pin Description

Supplied As*

Rail (94 Units/Rail)

Tape and Reel (2500

Units/Reel)

Pin No.

Name

MPS DELAY

MASTER POWER

SOURCE

ADAPTER

ENABLE

ADAPTER

PRESENT

CHARGER

PRESENT

GND

DISCONNECT

BACKFEED

DIRECTION

SENSE

PEAK SENSE

VADAPTER

Function

A capacitor between this pin and ground sets the delay of the MPS risetime. See MPS

DELAY description in Typical Application section.

Bi-directional logic pin. If driven high by an external source, indicates that a battery is

powering the power bus. If driven high by the AIC, indicates the adapter is powering the

bus. AIC cannot drive MPS low. If there is no valid adapter voltage present, the pin is not

an output but a high impedance logic input. The input is pulled-down via an internal 40k

resistor.

Logic input pin. Active high. Grants permission to the adapter to drive both the power bus

and the MPS signal.

Logic output pin. High when 12 volts < VADAPTER < 17 volts. The output typically has 40k

pull-down resistor. The source current is not internally limited and the part can be

damaged if the output is shorted to ground when driven HIGH.

Logic output pin. High when VADAPTER > 17 volts. The output typically has 40k pull-down

resistor. The source current is not internally limited and the part can be damaged if the

output is shorted to ground when driven HIGH.

IC ground pin.

Drives the gate of the disconnect P-ch FET.

Drives the gate of the backfeed P-ch FET.

Connection for current sense resistor to control BACKFEED.

Connection for current sense resistor to control DISCONNECT.

Power input pin. Output of AC adapter, auto adapter or airline adapter.

www.national.com

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제조업체: National Semiconductor

( national )

LM26 converter

데이터시트 다운로드 :

[ LM26.PDF ]

[ LM26 다른 제조사 검색 ]

국내 전력반도체 판매점

상호 : 아이지 인터내셔날

전화번호 : 051-319-2877

[ 홈페이지 ]

IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈

( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )

전력반도체 문의 : 010-3582-2743

일반적인 전자부품 판매점

디바이스마트

IC114

엘레파츠

ICbanQ

Mouser Electronics

DigiKey Electronics

Element14

LM26 반도체 회로 부품 판매점

400mA Sub-miniature/ Programmable/ Step-Down DC-DC Converter for Ultra Low-Voltage Circuits

국내 전력반도체 판매점

일반적인 전자부품 판매점

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