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Application NotesAN-171: Reverse Voltage Protection for Battery Chargers
Features and Benefits
- Complete Linear Charger for 1-Cell Lithium-Ion Batteries
- Thermal Regulation Maximizes Charging Rate without Risk of Overheating*
- No External MOSFET, Sense Resistor or Blocking Diode Required
- Up to 1.5A Charging Current
- Preset Charge Voltage with 1% Accuracy
- Programmable Charge Current with 7% Accuracy
- Programmable Charge Termination Timer
- Tiny Thermally Enhanced 10-Pin MSOP Package
- Charge Current Monitor Useful for Gas Gauging*
- C/10 Charge Current Detection Output
- Automatic Recharge
- Thermistor Input for Temperature Qualified Charging
- AC Present Logic Output
- 4.1V/4.2V Pin Selectable Output Voltage
The LTC1733 is a standalone constant-current/constant-voltage linear charger for lithium-ion batteries with an on-chip power MOSFET. Internal thermal feedback regulates the charge current to limit die temperature during high power operation or high ambient temperature conditions. This feature allows the user to program a high charge current without risk of damaging the LTC1733 or the handheld product.
No external current sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture. The charge current and charge time can be set externally with a single resistor and capacitor, respectively. When the input supply (wall adapter) is removed, the LTC1733 automatically enters a low current sleep mode, dropping the battery drain current to less than 5µA.
The LTC1733 also includes NTC temperature sensing, C/10 detection circuitry, AC present logic, 4.1V/4.2V pin selectability and low battery charge conditioning (trickle charging).
The LTC1733 is available in a 10-pin thermally enhanced MSOP package.
- Cellular Telephones
- Handheld Computers
- Digital Still Cameras
- Charging Docks and Cradles
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.
Tools & Simulations
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Models for the following parts are available in LTspice:
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.