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LT1769(V2) Datasheet - Linear Technology

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Part Name
LT1769

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16 Pages

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205.8 kB

MFG CO.
Linear
Linear Technology Linear

DESCRIPTION
The LT®1769 current mode PWM battery charger is a simple, efficient solution to fast charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel-metalhydride (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.

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

APPLICATIONS
■ Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries
■ Switching Regulators with Precision Current Limit

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