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LTC4007-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4007-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page 1 LTC4007-1 40071f TYPICAL APPLICATIO APPLICATIO S DESCRIPTIO FEATURES 4A, High Efficiency, Li-Ion Battery Charger ■ Charger Controller for 3- or 4-Cell Lithium-Ion Batteries ■ High Conversion Efficiency: Up to 96% ■ Output Currents Exceeding 4A ■ ±0.8% Charging Voltage Accuracy ■ Built-In Charge Termination for Li-Ion Batteries ■ AC Adapter Current Limiting Maximizes Charge Rate* ■ Thermistor Input for Temperature Qualified Charging ■ Wide Input Voltage Range: 6V to 28V ■ 0.5V Dropout Voltage; Maximum Duty Cycle: 98% ■ Programmable Charge Current: ±4% Accuracy ■ Indicator Outputs for Charging, C/10 Current Detection, AC Adapter Present, Low Battery, Input Current Limiting and Faults ■ Charging Current Monitor Output ■ Available in a 24-Pin 4mm × 5mm QFN Package ■ Notebook Computers ■ Portable Instruments ■ Battery-Backup Systems ■ Li-Ion Chargers 12.6V, 4A Li-Ion Battery Charger The LTC ®4007-1 is a constant-current/constant-voltage charger controller for 3- or 4-cell lithium-ion batteries. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capaci- tors. Charging current is programmable to ±4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the programming resistor. The output float voltage is pin programmed for cell count (3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, programmed by an external resistor, sets the total charge time. The LTC4007-1 includes a thermistor input, which sus- pends charging if an unsafe temperature condition is de- tected. If the cell voltage is less than 3.25V, a low-battery indicator asserts and can be used to program a trickle charge current to safely charge depleted batteries. The FAULT pin is also asserted and charging terminates if the low-battery condition persists for more than 1/4 of the total charge time. 3C4C CHEM LOBAT ICL ACP SHDN FAULT CHG FLAG NTC RT LOBAT ICL ACP SHDN FAULT CHG FLAG DCIN INFET CLP CLN TGATE BGATE PGND CSP BAT PROG ITH GND LTC4007-1 32.4k 309k 0.47 µF THERMISTOR 10k NTC TIMING RESISTOR (~2 HOURS) 100k 100k 100k VLOGIC DCIN 0V TO 28V 0.1 µF INPUT SWITCH 15nF Q1 Q2 20 µF 10 µH 4.99k 3.01k 3.01k 0.025 Ω 0.025 Ω 20 µF Li-Ion BATTERY CHARGING CURRENT MONITOR Q1: Si4431BDY Q2: FDC645N SYSTEM LOAD 0.12 µF 6.04k 26.7k 0.0047 µF 40071 TA01 PART AUTO RESTART LOW BATTERY THRESHOLD (Per Cell) (4.2V/4.1V) LTC4007-1 NO 3.25V/3.173V LTC4007 YES 2.5V/2.44V , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patents including 5723970. |
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