LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting

Linear（凌力尔特）| Linear产品型号搜索

当前位置：Linear公司 > > 凌力尔特芯片 >> LT1769

LT1769技术文档下载：

LT1769 - 典型应用图例：

LT1769 - 封装图解：

LT1769 - LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting

LT1769是Linear公司的一款开关充电器产品，LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting，本站介绍了LT1769的封装应用图解、特点和优点、功能等，并给出了与LT1769相关的凌力尔特元器件型号供参考。

LT1769 - Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting

LT1769 - Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting - Linear Technology（凌力尔特）

功能描述

The LT1769 current mode PWM battery charger is a simple, efficient solution to fast charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charging. The internal switch is capable of delivering 2A** DC current (3A peak current). Charge current can be programmed by resistors or a DAC to within 5%. With 0.5% reference voltage accuracy, the LT1769 meets the critical constant-voltage charging requirement for Li-Ion cells.

A third control loop is provided to regulate the current drawn from the input AC adapter. This allows simultaneous operation of the equipment and battery charging without overloading the adapter. Charge current is reduced to keep the adapter current below specified levels.

The LT1769 can charge batteries ranging from 1V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturating switch running at 200kHz gives high charging efficiency and small inductor size. A blocking diode is not required between the chip and the battery because the chip goes into sleep mode and drains only 3µA when the wall adapter is unplugged.

特点

Simple Solution to Charge NiCd, NiMH and Lithium Rechargeable Batteries—Charging Current Programmed by Resistors or DAC

Adapter Current Limit Allows Maximum Possible Charging Current During System Use*

Precision 0.5% Accuracy for Voltage Mode Charging

High Efficiency Current Mode PWM with 3A Internal Switch

5% Charge Current Accuracy

Adjustable Undervoltage Lockout

Automatic Shutdown When AC Adapter is Removed

Low Reverse Battery Drain Current: 3µA

Current Sensing Can Be at Either Terminal of the Battery

Charging Current Soft Start

Shutdown Control

Available in 20-Lead Exposed Pad TSSOP and 28-Lead Narrow SSOP Packages

应用

Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries

Switching Regulators with Precision Current Limit

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LT1769CFE	TSSOP-20	C	$6.03	$5.10
LT1769CFE#PBF	TSSOP-20	C	$6.03	$5.10
LT1769CFE#TR	TSSOP-20	C		$5.22
LT1769CFE#TRPBF	TSSOP-20	C		$5.22
LT1769CGN	SSOP-28	C	$5.60	$4.95
LT1769CGN#PBF	SSOP-28	C	$5.60	$4.95
LT1769CGN#TR	SSOP-28	C		$5.05
LT1769CGN#TRPBF	SSOP-28	C		$5.05
LT1769IFE	TSSOP-20	I	$6.63	$5.60
LT1769IFE#PBF	TSSOP-20	I	$6.63	$5.60
LT1769IFE#TR	TSSOP-20	I		$5.72
LT1769IFE#TRPBF	TSSOP-20	I		$5.72
LT1769IGN	SSOP-28	I	$6.80	$6.00
LT1769IGN#PBF	SSOP-28	I	$6.80	$6.00
LT1769IGN#TR	SSOP-28	I		$6.10
LT1769IGN#TRPBF	SSOP-28	I		$6.10