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LTC1732-8.4: Lithium-Ion Linear Battery Charger Controller Data Sheet8/28/2007PDF154K
Overview
Features and Benefits
- Complete Linear Charger Controller for 2-Cell Lithium-Ion Batteries
- Preset Charge Voltage with ±1% Accuracy
- Programmable Charge Current
- C/10 Charge Current Detection Output
- Programmable Charge Termination Timer
- Small, Thin 10-Pin MSOP Package
- Input Supply (Wall Adapter) Detection Output
- 8.8V to 12V Input Voltage Range
- Automatic Sleep Mode When Input Supply Is Removed (Only 10µA Battery Drain)
- Automatic Trickle Charging of Low Voltage Cells
- Programmable for Constant-Current-Only Mode
- Battery Insertion Detect and Automatic Charging of Low-Battery
- Automatic Battery Recharge
Product Details
The LTC1732-8.4 is a complete constant-current/constant-voltage linear charge controller for lithium-ion (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal-hydride (NiMH) batteries can also be charged with constant current using external termination. Charge current can be programmed with ±7% accuracy using external sense and program resistors. An internal resistor divider and precision reference set the final float voltage with ±1% accuracy.
When the input supply is removed, the LTC1732-8.4 automatically enters a low current sleep mode, dropping the battery drain current to 10µA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until battery voltage exceeds 4.9V.
The LTC1732-8.4 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In additon, if the battery remains connected to the charger and the cell voltage drops below 8.05V, a new charge cycle will begin.
The LTC1732-8.4 is available in the 10-pin MSOP package.
| Float Voltage | Recharge Voltage | |
| LTC1732-4 |
4.1V or 4.2V (pin select) |
3.8V |
| LTC1732-4.2 | 4.2V |
4.05V |
| LTC1732-8.4 |
8.4V | 8.05V |
Applications
- Cellular Phones
- Handheld Computers
- Charging Docks and Cradles
- Digital Cameras and Camcorders
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.
Documentation & Resources
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R384 Reliability Data3/26/2018PDF18 K
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Low Dropout Linear Li-Ion Charge Controllers Prevent Overcharging, Save Board Space11/1/2000 LT Journal
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 |
|---|---|---|---|---|
| LTC1732EMS-8.4#PBF | Material Declaration | Reliability Data | 10-Lead MSOP | |
| LTC1732EMS-8.4#TRPBF | Material Declaration | Reliability Data | 10-Lead MSOP | |
| Wafer Fabrication Data | R384 Reliability Data |
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