1

2

3

4

5

10

9

8

7

6

LM3658

Stat2

Stat1

Iset

Ts

BATT

1 PF

Battery

Pack

GND

USB_sel

EN_b

1 PF

1 PF

CHG_IN

4.5V to 6V

USBpwr

4.5V to 6V

+

LM3658

www.ti.com

SNVS328E – MAY 2005 – REVISED MARCH 2007

LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications

Check for Samples: LM3658

1

FEATURES

DESCRIPTION

The LM3658 is a single chip charger IC designed for

2

•

Integrated Power FETs with Thermal

handheld applications. It can safely charge and

Regulation

maintain a single cell Li-Ion/Polymer battery operating

•

Charges from Either an AC Wall Adapter or

from an AC wall adapter or USB power source. Input

USB Power Source with Automatic Source

power source selection of USB/AC is automatic. With

Selection

both power sources present, the AC power source

has priority. Charge current is programmed through

•

50 mA to 1000 mA Charge Currents Using AC

an external resistor when operating from an AC wall

Wall Adapter

adapter allowing charge currents from 50 mA to 1000

•

Pin-Selectable USB Charge Currents of 100

mA. When the battery is charged using USB power,

mA or 500 mA

charge currents of 100 mA or 500 mA are pin-

•

LDO Mode with 1A of Source Current is

selectable. The termination voltage is controlled to

within ±0.35% of 4.2V.

Automatically Invoked When the Battery is

Absent and the AC Wall Adapter is Connected

The LM3658 requires few external components and

•

Continuous Battery Temperature Monitoring

integrates internal power FETs, reverse current

protection and current sensing. The internal power

•

Built-in Multiple Safety Timers

FETs are thermally regulated to obtain the most

•

Charge Status Indication

efficient

charging

rate

for

a

given

ambient

•

Continuous Over-current and Temperature

temperature.

Protection

The LM3658 operates in five modes: pre-qualification

•

Near-depleted Battery Pre-conditioning

mode,

constant-current

mode,

constant-voltage

•

Sleep Mode with Ultra Low Quiescent Current

mode,

top-off

mode

and

maintenance

mode.

Additionally, the charger IC operates as a linear

•

On-board Kelvin-sensing Achieves ±0.35%

regulator in “LDO mode”, when the AC wall adapter is

Termination Accuracy

connected and no battery is present. Optimal battery

•

Maintenance Mode with Automatic Recharge

management is obtained through thermal regulation,

•

Thermally Enhanced 3 mm x 3 mm WSON

battery temperature measurement and multiple safety

timers. The LM3658 provides two open-drain outputs

Package

for LED status indication or connection to GPIOs.

APPLICATIONS

Typical Application

•

Smartphones

•

Digital Still Cameras

•

PDAs

•

Hard Drive and Flash-based MP3 Players

•

USB-powered Devices

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.