MAX8568B

Complete Backup-Management ICs for Lithium and NiMH Batteries

Data Sheet (Rev. 1)

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Overview

Automatically Manage All Backup Switchover Functions

Charge Both NiMH and Rechargeable Lithium Backup Batteries

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

The MAX8568A/MAX8568B backup-battery-management ICs are complete charging and backup switchover control solutions for PDAs, Smart Phones, and other smart portable devices. They charge both NiMH and rechargeable lithium battery types and feature programmable 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 onchip 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 onchip synchronous-rectified, low-quiescent-current boost converter. Additionally, a low-quiescent-current LDO generates 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.

Applications

DSCs and DVCs
Internet Appliances and Web-Books
Palmtops and Wireless Handhelds
PDAs and PDA Phones
Smartphones

Documentation

Data Sheet 1

MAX8568A-MAX8568B: Complete Backup-Management ICs for Lithium and NiMH Batteries Data Sheet (Rev.1) 07/04/2005

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation for the MAX8568A

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Features and Benefits

Charges Both NiMH and Rechargeable Lithium Backup Batteries

Internal Switch Step-Up DC-DC Converter for 1-Cell NiMH Battery Input

Two Backup Output Voltages
3.3V, 50mA Step-Up DC-DC Converter
2.5V, 10mA LDO

Programmable Charge Current

Programmable Charge Voltage Limit

On Board p-Channel MOSFETs for Backup Switchover

Fully Assembled and Tested

Product Details

The MAX8568A evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX8568A and MAX8568B complete backup-management ICs for lithium and NiMH batteries. The MAX8568A EV kit can charge both NiMH and rechargeable lithium battery types; the EV kit default setting is for NiMH charging. Two on-board p-channel MOSFETs allow the evaluation of backup switchover from the primary source. Low-voltage backup cells can be stepped up by the on-chip synchronous-rectified step-up DC-DC converter, which has a default setting of 3.3V on the EV kit and is capable of 50mA output current. A secondary output provided by an on-chip LDO has a 2.5V output voltage for the MAX8568A and is capable of providing 10mA output current. When the main battery is connected, these two voltages are typically provided by a MAX1586/MAX1587 multi-output complete system power supply. The MAX8568A EV kit can also evaluate the MAX8568B. To evaluate the MAX8568B, order a free sample along with this EV kit.