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LTC4002

Linear Technology
Part Number LTC4002
Manufacturer Linear Technology
Description Standalone Li-Ion Switch Mode Battery Charger
Published Nov 12, 2006
Detailed Description www.DataSheet4U.com LTC4002 Standalone Li-Ion Switch Mode Battery Charger FEATURES ■ DESCRIPTIO ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ...
Datasheet PDF File LTC4002 PDF File

LTC4002
LTC4002

Overview
www.
DataSheet4U.
com LTC4002 Standalone Li-Ion Switch Mode Battery Charger FEATURES ■ DESCRIPTIO ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Wide Input Supply Range: 4.
7V to 22V – 4.
2 Version 8.
9V to 22V – 8.
4 Version High Efficiency Current Mode PWM Controller with 500kHz Switching Frequency ±1% Charge Voltage Accuracy End-of-Charge Current Detection Output 3 Hour Charge Termination Timer Constant Switching Frequency for Minimum Noise ± 5% Charge Current Accuracy Low 10µA Reverse Battery Drain Current Automatic Battery Recharge Automatic Shutdown When Input Supply is Removed Automatic Trickle Charging of Low Voltage Batteries Battery Temperature Sensing and Charge Qualification Stable with Ceramic Output Capacitor 8-Lead SO and 10-Lead DFN Packages The LTC®4002 is a complete battery charger controller for one (4.
2V) or two (8.
4V) cell lithium-ion batteries.
With a 500kHz switching frequency, the LTC4002 provides a small, simple and efficient solution to fast charge Li-Ion batteries from a wide range of supply voltages.
An external sense resistor sets the charge current with ±5% accuracy.
An internal resistor divider and precision reference set the final float voltage to 4.
2V per cell with ±1% accuracy.
When the input supply is removed, the LTC4002 automatically enters a low current sleep mode, dropping the battery drain current to 10µA.
An internal comparator detects the near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle.
After the charge cycle ends, if the battery voltage drops below 4.
05V per cell, a new charge cycle will automatically begin.
The LTC4002 is available in the 8-lead SO and 10-lead DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
U APPLICATIO S ■ ■ ■ Portable Computers Charging Docks Handheld Instruments TYPICAL APPLICATIO 1.
5A Single Cell Li-Ion Battery Charger VIN 5V TO 22V 100 90 0.
1µF BAT 2...


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