LT1769
PRODUCTIONConstant-Current/Constant-Voltage 2A Battery Charger with Input Current Limiting
- Part Models
- 8
- 1ku List Price
- Starting From $9.05
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
Documentation
Data Sheet 1
User Guide 2
Application Note 1
Design Note 1
Brochure 1
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 | ||
| LT1769CFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT1769CGN#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1769CGN#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1769IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT1769IFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT1769IGN#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1769IGN#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| 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 |
||
| 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
Can't find the software or driver you need?
Request a Driver/SoftwareHardware 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 |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC2955 | RECOMMENDED FOR NEW DESIGNS | Pushbutton On/Off Controller with Automatic Turn-On |
| Overvoltage & Overcurrent Protectors 1 | ||
| LTC4365 | RECOMMENDED FOR NEW DESIGNS | Overvoltage, Undervoltage and Reverse Supply Protection Controller |
Evaluation Kits
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