LINEAR LTC4054-4.2/LTC4054X-4.2 DATA SHEET

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Final Electrical Specifications

LTC4054-4.2/LTC4054X-4.2 Standalone Linear

BATTERY VOLTAGE (V)

Li-Ion Battery Charger with Thermal Regulation in Thin SOT

February 2003

FEATURES DESCRIPTIO Programmable Charge Current Up to 800m A The LTC®4054 is a complete constant-current/constant- No External MOSFET, Sense Resistor or Blocking voltage linear charger for single cell lithium-ion batteries. Diode Required Its Thin SOT package and low external component count

Complete Linear Charger in Thin SOTTM Package for make the LTC4054 especially well-suited for portable Single Cell Lithium-Ion Batteries applications. Furthermore, the LTC4054 is specifically Constant-Current/Constant-Voltage Operation with designed to work within USB power specifications.

Thermal Regulation to Maximize Charge Rate

No external sense resistor is needed and no blocking diode

Without Risk of Overheating

is required due to the internal MOSFET architecture. Ther-

Charges Single Cell Li-Ion Batteries Directly

mal feedback regulates the charge current to limit the die

from USB Port

temperature during high power operation or high ambient

Preset 4.2V Charge Voltage with ±1% Accuracy

temperature. The charge voltage is fixed at 4.2V and the

Charge Current Monitor Output for Gas

charge current can be programmed externally with a

Gauging

CH AR GE UR RE NT (m A) single resistor. The LTC4054 automatically terminates the

Automatic Recharge

charge cycle when the charge current drops to 1/10th the

Charge Status Output Pin

programmed value after the final float voltage is reached.

C/10 Charge Termination

25µA Supply Current in Shutdown When the input supply (wall adapter or USB supply) is 2.9V Trickle Charge Threshold (LTC4054) removed, the LTC4054 automatically enters a low current Available Without Trickle Charge (LTC4054X) state, dropping the battery drain current to less than 2µA. Soft-Start Limits Inrush Current The LTC4054 can be put into shutdown mode, reducing the supply current to 25µA.

APPLICATIO S

Other features include charge current monitor, undervoltage

Cellular Telephones, PDAs

lockout, automatic recharge and a status pin to indicate

Portable MP3 Players

charge termination and the presence of input voltage.

Charging Docks and Cradles

, LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation.

Bluetooth Applications

TYPICAL APPLICATIO Complete Charge Cycle (750m Ah Battery)

CONSTANT 600m A Single Cell Li-Ion Charger CURRENT

CONSTANT CONSTANT

4.5V TO 5.25V POWER VOLTAGE 4.25

VCC 3.75

LTC4054-4.2

PROG 4.2V VCC = 5V Li-Ion θJA = 130°C/W

GND CHARGE 3.25

1.65k BATTERY RPROG = 1.65k

TERMINATED

TA = 25°C

405442 TA01a

0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 TIME (HOURS) 405442 TAO1b

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.