LT1769
Constant-Current/Constant-Voltage 2A Battery Charger with Input Current Limiting
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Overview
Features and Benefits
- 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
Product Details
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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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R324 Reliability Data3/26/2018PDF21 K
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DC299A - Demo Manual9/24/2009PDF71K
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DC243A - Demo Manual9/24/2009PDF293K
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DN242 - Li-Ion Charge Termination IC Interfaces with PWM Switchers4/1/2014PDF72K
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT1769CFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT1769CFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT1769CGN#PBF | Material Declaration | Reliability Data | 28-Lead SSOP (Narrow 0.15 Inch) | |
| LT1769CGN#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP (Narrow 0.15 Inch) | |
| LT1769IFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT1769IFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT1769IGN#PBF | Material Declaration | Reliability Data | 28-Lead SSOP (Narrow 0.15 Inch) | |
| LT1769IGN#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP (Narrow 0.15 Inch) | |
| Wafer Fabrication Data | R324 Reliability Data |
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.