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LTC4053EMSE-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4053EMSE-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC4053-4.2 1 4053fa ■ Cellular Telephones ■ Handheld Computers ■ Charging Docks and Cradles ■ MP3 Players ■ Digital Cameras ■ Charges Single-Cell Li-Ion Batteries Directly from USB Port ■ Thermal Regulation Maximizes Charge Rate without Risk of Overheating* ■ Programmable Charge Current with ±7% Accuracy ■ Low Dropout Operation ■ No External MOSFET, Sense Resistor or Blocking Diode Required ■ Programmable Charge Termination Timer ■ Preset Charge Voltage with ±1% Accuracy ■ C/10 Charge Current Detection Output ■ AC Present Logic Output ■ 25 µA Supply Current in Shutdown Mode ■ Automatic Recharge ■ Charge Current Monitor Useful for Gas Gauging ■ Thermistor Input for Temperature Qualified Charging ■ Available in 10-pin thermally enhanced MSOP and low profile (0.75mm) 3mm × 3mm DFN packages USB Compatible Lithium-Ion Battery Charger with Thermal Regulation The LTC ®4053 is a standalone linear charger for lithium- ion batteries that can be powered directly from a USB port. The IC contains an on-chip power MOSFET and eliminates the need for an external sense resistor and blocking diode. Thermal regulation automatically adjusts charge current to limit die temperature during high power or high ambient temperature conditions. This feature protects the end product and the LTC4053 from thermal stress while the IC charges the battery at maximum rate without interruption. The charge current and charge time can be set externally with a single resistor and capacitor, respectively. When the input supply (wall adapter or USB supply) is removed, the LTC4053 automatically enters a low current sleep mode, dropping the battery drain current to less than 5 µA. The LTC4053 also includes NTC temperature sensing, C/10 detection circuitry, AC present logic, low battery charge conditioning (trickle charging) and shutdown (25 µA supply current). The LTC4053 is available in 10-pin thermally enhanced MSOP and low profile (0.75mm) DFN packages. , LTC and LT are registered trademarks of Linear Technology Corporation. USB PORT 4.35V TO 5.5V 4.7 µF 4053TA01 4 2 USB CONTROL µC Li-Ion BATTERY SYSTEM LOAD + 0.1 µF 15k 100mA/ 500mA SUSPEND 3.74k SHDN VCC GND NTC 9 8 7 56 PROG LTC4053-4.2 BAT TIMER USB Powered Standalone Li-Ion Charger Protected by U.S. Patents including 6522118, 6700364. Charge Current vs Input Voltage VCC (V) 4.0 600 500 400 300 200 100 0 4.5 5.0 4053 G04 5.5 TA = 25°C RPROG = 3k VBAT = 3.95V VBAT = 4.15V VBAT = 4.05V FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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