LTC1730 Lithium-Ion Battery Pulse Chargers with Overcurrent Protection

The LTC®1730 is a complete pulse charger for 1-cell lithium-ion batteries. When charging a depleted cell, the internal MOSFET is fully on allowing the current limited input power source to provide charge current to the battery, virtually eliminating heat generation in the charger.

As the battery accepts charge and approaches the programmed voltage, the internal MOSFET begins switching off and on with the duty cycle gradually decreasing as the battery approaches a fully charged condition. A programmable timer ends the charge cycle. The end-of-charge condition is indicated at the CHRG pin when the average charge current falls to C/10. Removing the input voltage puts the LTC1730 into a sleep mode, dropping the battery current drain to less than 1µA (maximum).

An external sense resistor limits the maximum charge current as a safety precaution against a user connecting a wall adapter with the incorrect or no current limit. The internal MOSFET prevents reverse battery current from flowing if the input voltage is shorted to ground, eliminating the need for a blocking diode.

The LTC1730-4 is available in the 16-pin SSOP package and the LTC1730-4.2 is available in the 8-pin SO package

产品特点 Features

Complete Pulse Charger for 1-Cell Lithium-Ion Batteries
Sense Resistor Limits Maximum Current for Safety
1% Float Voltage Accuracy
End-of-Charge (C/10) Detection Output
Programmable Charge Termination Timer
Internal 0.35 Ohm NMOS Switch
No Blocking Diode Required
SEL Pin to Set Either 4.1V or 4.2V/ Cell (LTC1730-4)
Low-Battery Drain (1µA Max) when Input Supply Is Removed
Battery Temperature Sensing and Charge Qualification
Automatic Trickle Charge for Low-Battery Cell
Automatic Battery Refresh

参数

应用

Standalone Lithium-Ion Battery Charger
Handheld Computers
Cellular Telephones

典型应用图

LTC1730 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) *
LTC1730EGN-4	SSOP	16	E	$2.33	$2.05
LTC1730EGN-4#PBF	SSOP	16	E	$2.33	$2.05
LTC1730EGN-4#TR	SSOP	16	E		$2.11
LTC1730EGN-4#TRPBF	SSOP	16	E		$2.11
LTC1730ES8-4.2	SO	8	E	$2.07	$1.85
LTC1730ES8-4.2#PBF	SO	8	E	$2.07	$1.85
LTC1730ES8-4.2#TR	SO	8	E		$1.91
LTC1730ES8-4.2#TRPBF	SO	8	E		$1.91

LTC1730 数据手册及相关资料下载

数据手册(英文) : LTC1730 - Lithium-Ion Battery Pulse Chargers with Overcurrent Protection.PDF
可靠性数据 : R245 Reliability Data .PDF