LTC4095 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4095

Standalone USB Li-Ion/Polymer Battery Charger in 2mm × 2mm DFN

Linear Technology 

LTC4095

Standalone USB

Li-Ion/Polymer Battery

Charger in 2mm × 2mm DFN

FEATURES

■ Full-Featured Standalone USB Li-Ion/Polymer

Battery Charger

■ 100mA to 950mA Programmable Charge Current

■ C/10 Charge Current Detection Output

■ Internal Safety Timer Termination

■ NTC Thermistor Input for Temperature Qualified

Charging

■ Preset 4.2V Float Voltage with 0.5% Accuracy

■ Constant-Current/Constant-Voltage Operation with

Thermal Feedback

■ Charge Current Monitor Output for Gas Gauging

■ Automatic Recharge

■ Bad-Battery Detection

■ 8.5µA Input Supply Current in Suspend Mode

■ Tiny 8-Lead (2mm × 2mm) DFN Package

APPLICATIONS

■ PDAs

■ Media Players

■ Cellular Phones

■ Other Portable Electronics

DESCRIPTION

The LTC®4095 is a complete constant-current/constant-

voltage linear charger for single-cell lithium-ion/polymer

batteries. Its small 2mm × 2mm DFN package and low

external component count make the LTC4095 especially

well-suited for portable USB power applications.

Up to 950mA of charge current may be programmed via a

single resistor from the PROG pin to ground. The HPWR

pin allows the charge current to be set at 20% or 100% of

its full-scale programmed value. An internal safety timer

terminates charge current. The final float voltage is preset

to 4.2V and held to a tight 0.5% tolerance. Also featured

is an NTC thermistor input to monitor battery temperature

while charging, a C/10 current detection output, automatic

recharge, bad-battery detection and low-battery trickle

charge. A thermal feedback loop regulates the charge

current to limit the die temperature during high power

operation or high ambient thermal conditions.

The LTC4095 is available in a tiny, low profile (0.75mm)

8-lead 2mm × 2mm DFN package.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6522118, 6570372, 6700364.

TYPICAL APPLICATION

500mA Single-Cell Li-Ion Charger

IN

4.3V TO 5.5V

UP TO 7V

TRANSIENTS

CIN

1µF

IN

BAT

LTC4095

HPWR CHRG

SUSP NTC

PROG

GND

+ Li-Ion

BATTERY

RPROG

1.74k

4095 TA01a

4095fa

1

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