LTC1731-8.X Series
Single Cell Lithium-Ion Linear Battery Charger Controllers
Manufacturer: Analog Devices
Catalog
Single Cell Lithium-Ion Linear Battery Charger Controllers
| Part | Supplier Device Package | Charge Current - Max [Max] | Current - Charging | Voltage - Supply (Max) [Max] | Battery Pack Voltage | Package / Case | Package / Case [custom] | Package / Case | Programmable Features | Mounting Type | Number of Cells | Battery Chemistry | Operating Temperature [Max] | Operating Temperature [Min] | Package / Case [y] | Package / Case [x] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices | 8-MSOP | 500 mA | Constant - Programmable | 12 V | 4.1 V | 8-MSOP 8-TSSOP | 0.118 in | 3 mm | Timer | Surface Mount | 1 | Multi-Chemistry | 85 °C | -40 °C | ||
Analog Devices | 8-SO | 500 mA | Constant - Programmable | 12 V | 4.1 V | 8-SOIC | Timer | Surface Mount | 1 | Multi-Chemistry | 85 °C | -40 °C | 3.9 mm | 0.154 in | ||
Analog Devices | 8-SO | 500 mA | Constant - Programmable | 12 V | 8.4 V | 8-SOIC | Timer | Surface Mount | 2 | Multi-Chemistry | 85 °C | -40 °C | 3.9 mm | 0.154 in | ||
Analog Devices | 8-MSOP | 500 mA | Constant - Programmable | 12 V | 8-MSOP 8-TSSOP | 0.118 in | 3 mm | Timer | Surface Mount | 2 | Multi-Chemistry | 85 °C | -40 °C | |||
Analog Devices | 8-SO | 500 mA | Constant - Programmable | 12 V | 8-SOIC | Timer | Surface Mount | 2 | Multi-Chemistry | 85 °C | -40 °C | 3.9 mm | 0.154 in |
Key Features
• Complete Linear Charger Controller for 2-Cell Lithium-Ion Batteries
• 1% Voltage Accuracy
• Programmable Charge Current
• C/10 Charge Current Detection Output
• Programmable Charge Termination Timer
• Space Saving 8-Pin MSOP Package
• Automatic Sleep Mode When Input Supply is Removed (15µA Battery Drain)
• Automatic Trickle Charging of Low Voltage Cells
• Programmable for Constant-Current-Only Mode
Description
AI
The LTC1731-8.2/LTC1731-8.4 are complete constant-current/constant-voltage linear charger controllers for 2-cell lithium-ion (Li-Ion)batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termination. The external sense resistor sets the charge current with 7% accuracy. An internal resistor divider and precision reference set the final float potential with 1% accuracy. The output float voltages are set internally to 8.2V (LTC1731-8.2) or 8.4V (LTC1731-8.4).When the input supply is removed, the LTC1731-8.2/LTC1731-8.4 automatically enter a low current sleep mode, dropping the battery drain current to typically 15µA. 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 4.95V.The LTC1731-8.2/LTC1731-8.4 are available in the 8-pin MSOP and SO packages. For 1-cell Li-Ion battery charging, see the LTC1731-4.1 and LTC1731-4.2 data sheets.Float VoltageLTC1731-4.14.1VLTC1731-4.24.2VLTC1731-8.28.2VLTC1731-8.48.4VApplicationsCellular PhonesHandheld ComputersCharging Docks and CradlesProgrammable Current Source