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）

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.

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

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

Switching Regulators with Precision Current Limit

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

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