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General Description

The MAX1538 selector provides power-source control

for dual-battery systems. The device selects between

an AC adapter and dual batteries based on the pres-

ence of the three power sources and the state of

charge of each battery. The MAX1538 includes analog

comparators to detect AC/airline-adapter presence and

determine battery undervoltage. Fast analog circuitry

allows the device to switch between power sources to

implement a break-before-make time, which allows hot

swapping of battery packs. The MAX1538 indepen-

dently performs power-source monitoring and selec-

tion, freeing the system power-management µP for

other tasks. This simplifies the development of µP

power-management firmware and allows the µP to enter

standby, reducing system power consumption.

The MAX1538 supports “relearn mode,” which allows

the system to measure and fully utilize battery capacity.

In this state, the part allows the selected battery to be

discharged even when an AC adapter is present. The

MAX1538 can also be used to power the system in an

aircraft. On detecting an airline adapter, the MAX1538

automatically disables charging or discharging of bat-

tery packs and only allows the system to be powered

from the adapter.

The MAX1538 is available in a space-saving 28-pin thin

QFN package with a maximum footprint of 5mm x 5mm.

Applications

Notebook and Subnotebook Computers

Internet Tablets

Dual-Battery Portable Equipment

Features

♦ Automatically Detects and Responds to

Low-Battery Voltage Condition

Battery Insertion and Removal

AC-Adapter Presence

Airline-Adapter Presence

♦ Step-Down and Step-Up Charger Compatibility

♦ Fast Break-Before-Make Selection

Allows Hot Swapping of Power Sources

No External Schottky Diodes Needed

♦ 50µA Maximum Battery Quiescent Current

♦ Implements Battery Capacity Relearning

♦ Allows Usage of Aircraft Supply

♦ Direct Drive of P-Channel MOSFETs

♦ Simplifies Power-Management µP Firmware

♦ 4.75V to 28V AC-Adapter Input Voltage Range

♦ Small 28-Pin Thin QFN Package (5mm x 5mm)

MAX1538

Power-Source Selector for

Dual-Battery Systems

________________________________________________________________ Maxim Integrated Products 1

19-3169; Rev 0; 1/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX1538

REVBLK

DISA

DISB

BATA

BATB

CHGB

CHGA

CHGIN

ADPIN

EXTLD

ADPBLK

AIRDET

ACDET

MINVA

MINVB

CHRG

BATSEL

RELRN

OUT2

OUT1

OUT0

GND

BATSUP

BATTERY

CHARGER

CHG_OUT

SYSTEM LOAD

ADAPTER

BATTERY B

BATTERY A

PART TEMP RANGE PIN-PACKAGE

MAX1538ETI -40°C to +85°C 28 Thin QFN

Ordering Information

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

1 2 3 4 5 6 ... 21 22

Resumo do Conteúdo

Página 1 - Dual-Battery Systems

General DescriptionThe MAX1538 selector provides power-source controlfor dual-battery systems. The device selects betweenan AC adapter and dual batter

Página 2

MAX1538Power-Source Selector for Dual-Battery Systems10 ______________________________________________________________________________________PIN NAME

Página 3

MAX1538Power-Source Selector for Dual-Battery Systems______________________________________________________________________________________ 11MAX1538R

Página 4

MAX1538Power-Source Selector for Dual-Battery Systems12 ______________________________________________________________________________________MAX1538R

Página 5

MAX1538Power-Source Selector for Dual-Battery Systems______________________________________________________________________________________ 13ACDETAIR

Página 6

Power-Source Selector for Dual-Battery Systems14 ______________________________________________________________________________________Detailed Descri

Página 7

MAX1538Power-Source Selector for Dual-Battery Systems______________________________________________________________________________________ 15Battery

Página 8

MAX1538Power-Source Selector for Dual-Battery Systems16 ______________________________________________________________________________________Airline

Página 9

MAX1538Power-Source Selector for Dual-Battery Systems______________________________________________________________________________________ 17CHG Cont

Página 10

MAX1538Power-Source Selector for Dual-Battery Systems18 ______________________________________________________________________________________MOSFETs,

Página 11

MAX1538Power-Source Selector for Dual-Battery Systems______________________________________________________________________________________ 19crash, a

Página 12

MAX1538Power-Source Selector for Dual-Battery Systems2 _______________________________________________________________________________________ABSOLUTE

Página 13

MAX1538Power-Source Selector for Dual-Battery Systems20 ______________________________________________________________________________________where VB

Página 14

MAX1538Power-Source Selector for Dual-Battery Systems______________________________________________________________________________________ 21BATSUP24

Página 15

MAX1538Power-Source Selector for Dual-Battery SystemsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodie

Página 16

MAX1538Power-Source Selector for Dual-Battery Systems_______________________________________________________________________________________ 3ELECTRIC

Página 17

MAX1538Power-Source Selector for Dual-Battery Systems4 _______________________________________________________________________________________ELECTRIC

Página 18

MAX1538Power-Source Selector for Dual-Battery Systems_______________________________________________________________________________________ 5ELECTRIC

Página 19

MAX1538Power-Source Selector for Dual-Battery Systems6 _______________________________________________________________________________________PARAMETE

Página 20

MAX1538Power-Source Selector for Dual-Battery Systems_______________________________________________________________________________________ 7VDD LOAD

Página 21

MAX1538Power-Source Selector for Dual-Battery Systems8 _______________________________________________________________________________________Typical

Página 22 - Package Information

MAX1538Power-Source Selector for Dual-Battery Systems_______________________________________________________________________________________ 9PIN NAME

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Rainbow-electronics MAX1538 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX1538. Rainbow Electronics MAX1538 User Manual Manual do Utilizador

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