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LTC4050 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4050 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC4050 4050f Lithium-Ion Linear Battery Charger with Thermistor Interface The LTC ®4050-4.1/LTC4050-4.2 are complete standalone constant-current/constant-voltage linear charge control- lers for lithium-ion (Li-Ion) batteries. Charge current is programmable and final float voltage has ±1% accuracy. When the input supply is removed, the LTC4050 automati- cally enters a low quiescent current sleep mode, dropping the battery drain current to 5 µA. An internal comparator detects the near-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 cell voltage exceeds 2.49V. The thermistor interface suspends charging if the cell temperature is outside of a 0 °C to 50°C temperature window. The LTC4050 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In addition, a new charge cycle is automatically started if the battery remains connected to the charger and the cell voltage drops below 3.88V for 4.1V cells or below 3.98V for 4.2V cells. The LTC4050 is available in the 10-pin MSOP package. s Complete Standalone Linear Charger Controller for 1-Cell Lithium-Ion Batteries s Thermistor Interface for Battery Temperature Sensing s Preset Charge Voltage with ±1% Accuracy s Programmable Charge Current s C/10 Charge Current Detection Output s Programmable Charge Termination Timer s Input Supply (Wall Adapter) Detection Output s 4.5V to 10V Input Voltage Range s Automatic Sleep Mode When Input Supply is Removed (Only 5 µA Battery Drain) s Automatic Trickle Charging of Low Voltage Cells s Automatic Battery Recharge s Battery Insertion Detection s Space Saving 10-Pin MSOP Package s Cellular Phones s Handheld Computers s Charging Docks and Cradles APPLICATIO S TYPICAL APPLICATIO Single Cell 4.2V 500mA Li-Ion Battery Charger FEATURES DESCRIPTIO VCC VIN 6V SENSE DRV 1k 1k 0.2 Ω 19.6k 4.2V Li-Ion CELL LTC4050-4.2 *SHUTDOWN INVOKED BY FLOATING THE PROG PIN BAT CHRG 9 MBRM120T3 10 µF 4050 TA01 1 µF IBAT = 500mA 0.1 µF Si9430DY 7 1 6 * 8 52 + 3 10 4 ACPR TIMER PROG NTC GND 10k NTC DALE NTHS-1206N02 T , LTC and LT are registered trademarks of Linear Technology Corporation. Charge Current vs Thermistor Temperature THERMISTOR TEMPERATURE ( °C) –50 400 500 600 25 75 4050 TA05 300 200 –25 0 50 100 125 100 0 VBAT = 3.7V |
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