MAX1259C 查看數據表（PDF） - Maxim Integrated

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MAX1259C

Battery Manager

Maxim Integrated 

MAX1259

Battery Manager

General Description

The MAX1259 battery manager provides backup-battery

switching for CMOS RAM, microprocessors, or other low-

power logic ICs. It automatically switches to the backup

battery when the primary power supply is interrupted.

Low-loss switches guarantee an input-to-output differ-

ential of only 200mV while supplying 250mA from the

primary power supply or 15mA from the battery.

Battery discharge during shipping does not occur in the

MAX1259, since the backup battery can be disconnected

by strobing the RST input.

A battery-fail output signal indicates when the backup bat-

tery is below +2V, and a power-fail output signal indicates

when the primary power supply is low. The MAX1259

monitors the backup battery, warns of impending power

failures, and switches the memory to the battery when

failures occur. The MAX1259 is pincompatible with the

DS1259, but consumes three times less supply current.

Commercial, extended, and military temperature range

devices are available.

Applications

●● Battery Backup for CMOS RAM

●● Uninterruptible Power Supplies

●● Computers

●● Controllers

Functional Diagram

VCCI

VCCO

VBATT

RESET

LOGIC

RST

PF

BF

REF

MAX1259

BAT

GND

Features

●● Switches to Backup Battery if Power Fails

●● Consumes Less than 100nA of Battery Current

●● Power-Fail Output Signals Primary Power-Supply

Loss

●● Battery Monitor Indicates Low Battery

●● Battery Can Be Disconnected to Prevent Discharge

During Shipping

●● Battery Automatically Reconnected when VCC is

Applied

●● Pin-Compatible with the DS1259

●● Supply Current Three Times Lower than DS1259

●● Available in Extended-Industrial and Military

Temperature Ranges

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX1259C/D

0°C to +70°C

Dice*

MAX1259CPE

0°C to +70°C

16 PDIP

MAX1259CWE

0°C to +70°C

16 Wide SO

MAX1259EPE

-40°C to +85°C 16 PDIP

MAX1259EWE

-40°C to +85°C 16 Wide SO

MAX1259MJE

-55°C to +125°C 16 CERDIP

*Contact factory for dice specifications.

Note: Devices in PDIP and SO packages are available in both

leadedPb) and lead(Pb)-free packaging. Specify lead-free by

adding the “+” symbol at the end of the part number when

ordering. Lead-free not available for CERDIP package.

Pin Configuration

TOP VIEW

N.C. 1

16 VCCI

VBATT 2

BF 3

MAX1259

15 VCCI

14 N.C.

N.C. 4

13 VCCO

BAT 5

12 VCCO

RST 6

11 PF

GND 7

10 N.C.

GND 8

9 N.C.

DIP/SO

19-4638; Rev 3; 9/14

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