LTC4096/LTC4096X

1

4096xf

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Dual Input Standalone

Li-Ion Battery Chargers

that are capable of charging a single-cell Li-Ion or Li-Poly-

mer battery from both wall adapter and USB inputs. The

chargers can detect power at the inputs and automatically

select the appropriate power source for charging.

No external sense resistor or blocking diode is required

for charging due to the internal MOSFET architecture.

Internal thermal feedback regulates the battery charge

current to maintain a constant die temperature during high

power operation or high ambient temperature conditions.

The float voltage is fixed at 4.2V and the charge current

is programmed with an external resistor. The LTC4096

terminates the charge cycle when the charge current drops

below the user programmed termination threshold after

the final float voltage is reached. The LTC4096 can be put

into shutdown mode reducing the DCIN supply current to

20µA, the USBIN supply current to 10µA, and the battery

drain current to less than 2µA even with power applied

to both inputs.

Other features include trickle charge (LTC4096 only), auto-

matic recharge, undervoltage lockout, charge status output

and power present output with 120mA drive capability.

Dual Input Battery Charger for Single-Cell Li-Ion Battery

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

All other trademarks are the property of their respective owners.

*Protected by U.S. Patents including 6522118.

Adapter and USB Inputs

Priority)

Wall Adapter Input

Drive Capability

Risk of Overheating*

(0.75mm) 10-Lead (3mm

× 3mm) DFN Package

Complete Charge Cycle (1100mAh Battery)

LTC4096

DCIN

USBIN

SUSP

IDC

IUSB

BAT

PWR

CHRG

ITERM

2k

1.24k

2k

1k

WALL

ADAPTER

USB

PORT

1

mF

1

mF

+

4.2V

Li-Ion

BATTERY

800mA (WALL)

500mA (USB)

4096 TA01

GND

ON OFF

TIME (HR)

0

4.2

200

0

400

800

600

1000

1.5

2.5

4096 TA01b

3.6

3.4

5.0

4.0

3.8

2.5

0

0.5

1.0

2.0

3.0

CONSTANT VOLTAGE

USBIN = 5V