LTC1732-4 Lithium-Ion linear Battery Charger Controller

The LTC®1732 is a complete constant-current/constant-voltage linear charge controller for lithium-ion (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal-hydride (NiMH) batteries can also be charged with constant current using external termination. Charge current can be programmed with 7% (max) accuracy using external sense and program resistors. An internal resistor divider and precision reference set the final float voltage with 1% accuracy. The SEL pin allows users to charge either 4.1V or 4.2V cells.

When the input supply is removed, the LTC1732 automatically enters a low current sleep mode, dropping the battery drain current to 7µA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.457V.

The LTC1732 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In addition, if the battery remains connected to the charger and the cell voltage drops below 3.8V for the LTC1732-4 or below 4.05V for the LTC1732-4.2, a new charge cycle will begin.

The LTC1732 is available in the 10-pin MSOP package

产品特点 Features

Complete linear Charger Controller for 1-Cell Lithium-Ion Batteries
Preset Charge Voltage with 1% Accuracy
4.5V to 12V Input Voltage Range
Programmable Charge Current
C/10 Charge Current Detection Output
Programmable Charge Termination Timer
Small, Thin 10-Pin MSOP Package
Select Pin to Charge Either 4.1V or 4.2V Cells (LTC1732-4)
Automatic Sleep Mode When Input Supply is Removed (Only 7µA Battery Drain)
Automatic Trickle Charge of Low Voltage Cells
Programmable for Constant-Current-Only Mode
Battery Insertion Detect
Input Supply (Wall Adapter) Detection Output
4.05V Recharge Threshold for 4.2V Cells (LTC1732-4.2)
3.8V Recharge Threshold for 4.1V or 4.2V Cells (LTC1732-4)

应用

Cellular Phones
Handheld Computers
Charging Docks and Cradles

典型应用图

参数

LTC1732-4 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) *
LTC1732EMS-4	MSOP	10	E	$2.52	$2.15
LTC1732EMS-4#PBF	MSOP	10	E	$2.52	$2.15
LTC1732EMS-4#TR	MSOP	10	E		$2.21
LTC1732EMS-4#TRPBF	MSOP	10	E		$2.21
LTC1732EMS-4.2	MSOP	10	E	$2.52	$2.15
LTC1732EMS-4.2#PBF	MSOP	10	E	$2.52	$2.15
LTC1732EMS-4.2#TR	MSOP	10	E		$2.21
LTC1732EMS-4.2#TRPBF	MSOP	10	E		$2.21
LTC1732EMS-8.4	MSOP	10	E	$2.52	$2.15
LTC1732EMS-8.4#PBF	MSOP	10	E	$2.52	$2.15
LTC1732EMS-8.4#TR	MSOP	10	E		$2.21
LTC1732EMS-8.4#TRPBF	MSOP	10	E		$2.21

LTC1732-4 数据手册及相关资料下载

数据手册(英文) : LTC1732-4/LTC1732-4.2 - Lithium-Ion linear Battery Charger Controller.PDF
可靠性数据 : R245 Reliability Data .PDF