LTC4002 Series

Standalone Li-Ion Switch Mode Battery Charger

Catalog

Standalone Li-Ion Switch Mode Battery Charger

Part	Operating Temperature [Max]	Operating Temperature [Min]	Programmable Features	Voltage - Supply (Max) [Max]	Battery Chemistry	Number of Cells	Mounting Type	Package / Case	Package / Case [y]	Package / Case [x]	Battery Pack Voltage	Supplier Device Package	Current - Charging
Analog Devices LTC4002ES8-4.2#TRPBF	85 °C	-40 °C	Timer	22 V	Lithium Ion	1	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.2 V	8-SO	Constant - Programmable
Analog Devices LTC4002EDD-4.2#TRPBF	85 °C	-40 °C	Timer	22 V	Lithium Ion	1	Surface Mount	10-WFDFN Exposed Pad			4.2 V	10-DFN (3x3)	Constant - Programmable
Analog Devices LTC4002ES8-4.2#PBF	85 °C	-40 °C	Timer	22 V	Lithium Ion	1	Surface Mount	8-SOIC	3.9 mm	0.154 in	4.2 V	8-SO	Constant - Programmable
Analog Devices LTC4002EDD-8.4#PBF	85 °C	-40 °C	Timer	22 V	Lithium Ion	2	Surface Mount	10-WFDFN Exposed Pad			8.4 V	10-DFN (3x3)	Constant - Programmable
Analog Devices LTC4002ES8-8.4#PBF	85 °C	-40 °C	Timer	22 V	Lithium Ion	2	Surface Mount	8-SOIC	3.9 mm	0.154 in	8.4 V	8-SO	Constant - Programmable

Catalog

Standalone Li-Ion Switch Mode Battery Charger

Key Features

• Wide Input Supply Range:4.7V to 22V – 4.2 Version8.9V to 22V – 8.4 Version

• 4.7V to 22V – 4.2 Version

• 8.9V to 22V – 8.4 Version

• High Efficiency Current Mode PWM Controller with500kHz 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 ChargeQualification

• Stable with Ceramic Output Capacitor

• 8-Lead SO and 10-Lead DFN Packages

Description

The LTC4002 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.ApplicationsPortable ComputersCharging DocksHandheld Instruments