MAX8971 Datasheet, PDF(1/39 Page) Maxim Integrated Products – Industrys Smallest 1.55A 1-Cell Li+ DC-DC Charger

19-4245; Rev 0; 1/12

EVALUATION KIT AVAILABLE

MAX8971

Industry's Smallest 1.55A

1-Cell Li+ DC-DC Charger

General Description

The MAX8971 is a compact, high-frequency, high-

efficiency switch-mode charger for a one-cell lithium-ion

(Li+) battery. It delivers up to 1.55A of current to the

battery from inputs up to 7.5V and withstands transient

inputs up to 22V. The 4MHz switch-mode charger is

ideally suited for small portable devices, such as head-

sets and ultra-portable media players. It minimizes

component size and heat.

Battery-protection features include: low-voltage prequali-

fication, charge fault timer, die temperature monitoring,

and battery temperature monitoring. The battery

temperature monitoring adjusts the charge current and

termination voltage for safe use of secondary lithium-ion

batteries.

The IC accepts either a general DC input or USB.

It has programmable automatic input-current limiting to pro-

tect upstream charging sources such as USB.

Charge parameters are easily adjustable through an I2C

interface. Charge is terminated based on user-selectable

minimum current level. A safety timer with reset control

provides a safety backup for I2C interface. Charge status

is provided to the application processor through an inter-

rupt pin.

The IC is available in a space-saving, 20-bump, 2.18mm

x 1.62mm WLP package.

Applications

USB Charging

Headsets and Media Players

Smartphones

Digital Cameras

GPS, PDAs

Benefits and Features

S Switch-Mode Charger

ï² High-Efficiency

ï² Low Heat

ï² Fast Charge Time

S Small and Simple

S Precise

ï² Up to Q5% Current Regulation and 0.5% Voltage

Regulation

S Safe

ï² JEITA Battery Temperature Monitor

ï² Over / Undervoltage Protection, Safety Timers,

Temperature Regulation

ï² USB Friendly

S Flexible

ï² Programmable Voltage/Current

ï² Status / Interrupts Through I2C

ï² Automatic Input Current Limit

S I2C Interface

ï² Input Current Limit (100mA to 1500mA)

ï² Fast-Charge / Termination Current (250mA to

1550mA)

ï² Charge Voltage (4.1V, 4.15V, 4.2V, 4.35V)

ï² Safety Timer

ï² Termination Enable

S +22V Absolute Maximum Input Voltage Rating

S Up to 7.5V Maximum Operating Input Voltage

S 5V USB/Safeout LDO for USB PHY

S 2.3A GSM RF Test Mode (Factory Testing)

S Charge Current to Voltage Conversion (VICHG) for

Baseband ADC

S Reverse Battery Leakage Protection

S Input /Output Overvoltage Protection

S Interrupt Status Output

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX8971.related.

Simplified Applications Circuit appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maximâs website at www.maxim-ic.com.

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