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
LTC4002 参数
应用
  • Portable Computers
  • Charging Docks
  • Handheld Instruments
典型应用图
LTC4002 典型应用
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
  1. 数据手册(英文) : LTC4002 - 2-Cell Standalone Li-Ion Switch Mode Battery Charger.PDF
  2. 可靠性数据 : R480 Reliability Data .PDF
  3. 产品选型卡 : I2C Battery Gas Gauges.PDF