LTC4002 Standalone Li-Ion Switch Mode Battery Charger

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

产品特点 Features

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

参数

应用

Portable Computers
Charging Docks
Handheld Instruments

典型应用图

LTC4002 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC4002EDD-4.2	DFN	10	E	$2.25	$1.90
LTC4002EDD-4.2#PBF	DFN	10	E	$2.25	$1.90
LTC4002EDD-4.2#TR	DFN	10	E		$2.00
LTC4002EDD-4.2#TRPBF	DFN	10	E		$2.00
LTC4002EDD-8.4	DFN	10	E	$2.25	$1.90
LTC4002EDD-8.4#PBF	DFN	10	E	$2.25	$1.90
LTC4002EDD-8.4#TR	DFN	10	E		$2.00
LTC4002EDD-8.4#TRPBF	DFN	10	E		$2.00
LTC4002ES8-4.2	SO	8	E	$2.15	$1.80
LTC4002ES8-4.2#PBF	SO	8	E	$2.15	$1.80
LTC4002ES8-4.2#TR	SO	8	E		$1.86
LTC4002ES8-4.2#TRPBF	SO	8	E		$1.86
LTC4002ES8-8.4	SO	8	E	$2.15	$1.80
LTC4002ES8-8.4#PBF	SO	8	E	$2.15	$1.80
LTC4002ES8-8.4#TR	SO	8	E		$1.86
LTC4002ES8-8.4#TRPBF	SO	8	E		$1.86

LTC4002 数据手册及相关资料下载

数据手册(英文) : LTC4002 - 2-Cell Standalone Li-Ion Switch Mode Battery Charger.PDF
可靠性数据 : R480 Reliability Data .PDF
产品选型卡 : I2C Battery Gas Gauges.PDF