LT1769

PRODUCTION

Constant-Current/Constant-Voltage 2A Battery Charger with Input Current Limiting

Part Models: 8
1ku List Price: Starting From $7.15

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Overview

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

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.

Applications

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

Part Models: 8
1ku List Price: Starting From $7.15

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT1769CFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769CFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769CGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769CGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769IFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769IFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769IGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1769IGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT1769CFE#PBF	PRODUCTION
LT1769CFE#TRPBF	PRODUCTION
LT1769IFE#PBF	PRODUCTION
LT1769IFE#TRPBF	PRODUCTION
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LT1769CGN#PBF	PRODUCTION
LT1769CGN#TRPBF	PRODUCTION
LT1769IGN#PBF	PRODUCTION
LT1769IGN#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Battery Monitors & Fuel Gauges 1
LTC2942-1	Obsolete	1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 2
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Evaluation Kits

LT1769CGN, LTC1729CMS8 | 2A Li-Ion Battery Charger with Termination Controller, 12V to 25V Input, 8.4 VOUT @ 2A Max.

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Product Details

DC299A-D Demo Board for:
LT1769 Constant-Current/Constant-Voltage 2A Battery Charger with Input Current Limiting
LTC1729 Li-Ion Battery Charger Termination Controllers