MAX8568B Maxim Integrated Products, MAX8568B Datasheet

MAX8568B

Manufacturer Part Number

MAX8568B

Description

(MAX8568A/B) Complete Backup-Management ICs

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8568B.pdf (17 pages)

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The MAX8568A/MAX8568B backup-battery-management

ICs are complete charging and backup switchover con-

trol solutions for PDAs, Smart Phones, and other smart

portable devices. They charge both NiMH and

rechargeable lithium battery types and feature pro-

grammable charge current and termination voltage.

Separate optimized charge algorithms for both lithium

and NiMH cells are included on-chip.

The MAX8568A/MAX8568B also manage backup

switchover from a primary power source. An accurate on-

chip voltage detector monitors the main supply and

backs up two system supplies (typically I/O and memory)

when main power falls. On-chip drivers switch external

MOSFETs to disconnect the main supply from the system

loads so the backup source is not drained.

Low-voltage backup cells can be stepped up by an on-

chip synchronous-rectified, low-quiescent-current boost

converter. Additionally, a low-quiescent-current LDO gen-

erates a second backup voltage. The MAX8568A LDO is

preset to 2.5V while the MAX8568B LDO is preset to 1.8V.

Both devices are supplied in 16-pin 3mm x 3mm thin

QFN packages rated for -40°C to +85°C operation.

19-3450; Rev 1; 5/05

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.

TOP VIEW

PDAs and PDA Phones

Smart Phones

DSCs and DVCs

Palmtops and Wireless Handhelds

Internet Appliances and Web-Books

TERMV

STRTV

GND

REF

________________________________________________________________ Maxim Integrated Products

General Description

THIN QFN

MAX8568A

MAX8568B

Pin Configuration

Complete Backup-Management ICs

Applications

for Lithium and NiMH Batteries

OD2

OD1

LDO

BKSU

♦ Automatically Manage All Backup Switchover

♦ Charge Both NiMH and Rechargeable Lithium

♦ On-Chip Battery Boost Converter for 1-Cell NiMH

♦ Two Backup Output Voltages

♦ Programmable Charge Current

♦ Programmable Charge Voltage Limit

♦ Low 17µA Operating Current in Backup Mode

♦ Eliminate Many Discrete Components

♦ Tiny 3mm x 3mm Thin QFN Package

MAX8568AETE

MAX8568BETE

Functions

Backup Batteries

PART

MAIN BATTERY

2.8V TO 5.5V

I/O OUT

3.3V, 50mA

I/O IN

MEM OUT

1.8V OR 2.5V, 10mA

MEM IN

BACKUP

BATTERY

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

Ordering Information

BKSU

PGND

BKV

OD1

LDO

OD2

MAX8568A

MAX8568B

PIN-

PACKAGE

16 Thin QFN

3mm x 3mm

(T1633-4)

16 Thin QFN

3mm x 3mm

(T1633-4)

TERMV

STRTV

INOK

CHGI

NI/LI

GND

REF

Features

MARK

TOP

ACK

ACL

Datasheet pdf - http://www.DataSheet4U.net/

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