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LTC4002EDD-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4002EDD-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC4002 1 4002f , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO ■ Portable Computers ■ Charging Docks ■ Handheld Instruments ■ Wide Input Supply Range: 4.7V to 22V – 4.2 Version 8.9V to 22V – 8.4 Version ■ High Efficiency Current Mode PWM Controller with 500kHz Switching Frequency ■ ±1% Charge Voltage Accuracy ■ End-of-Charge Current Detection Output ■ 3 Hour Charge Termination Timer ■ Constant Switching Frequency for Minimum Noise ■ ±5% Charge Current Accuracy ■ Low 10µA Reverse Battery Drain Current ■ Automatic Battery Recharge ■ Automatic Shutdown When Input Supply is Removed ■ Automatic Trickle Charging of Low Voltage Batteries ■ Battery Temperature Sensing and Charge Qualification ■ Stable with Ceramic Output Capacitor ■ 8-Lead SO and 10-Lead DFN Packages Standalone Li-Ion Switch Mode Battery Charger The LTC ®4002 is a complete battery charger controller for one (4.2V) or two (8.4V) cell lithium-ion batteries. With a 500kHz switching frequency, the LTC4002 provides a small, simple and efficient solution to fast charge Li-Ion batteries from a wide range of supply voltages. An external sense resistor sets the charge current with ±5% accuracy. An internal resistor divider and precision reference set the final float voltage to 4.2V per cell with ±1% accuracy. When the input supply is removed, the LTC4002 automati- cally enters a low current sleep mode, dropping the battery drain current to 10µA. An internal comparator detects the near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle. After the charge cycle ends, if the battery voltage drops below 4.05V per cell, a new charge cycle will automatically begin. The LTC4002 is available in the 8-lead SO and 10-lead DFN packages. 6.8µH 22µF + 4002 TA01 NTC: DALE NTHS-1206N02 10µF 0.1µF 0.47µF 2.2k 68mΩ Li-Ion BATTERY 10k NTC SENSE GATE BAT CHRG LTC4002ES8-4.2 VCC VIN 5V TO 22V BAT NTC GND COMP 2k CHARGE STATUS T 1.5A Single Cell Li-Ion Battery Charger INPUT VOLTAGE (V) 5 80 VBAT = 4V 90 25 4002 TA02 70 60 10 15 20 100 VBAT = 3.8V (CURVES INCLUDE INPUT DIODE) Efficiency vs Input Voltage |
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