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LTC4002ES8-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4002ES8-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC4002-4.2 1 400242i s Portable Computers s Charging Docks s Handheld Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. s Wide Input Supply Range: 4.7V to 24V s High Efficiency Current Mode PWM Controller with 500kHz Switching Frequency s ±1% Charge Voltage Accuracy s End-of-Charge Current Detection Output s 3 Hour Charge Termination Timer s Constant Switching Frequency for Minimum Noise s ±5% Charge Current Accuracy s Low 10 µA Reverse Battery Drain Current s Automatic Battery Recharge s Automatic Shutdown When Input Supply is Removed s Automatic Trickle Charging of Low Voltage Batteries s Battery Temperature Sensing and Charge Qualification s Stable with Ceramic Output Capacitor s 8-Lead SO and 10-Lead DFN Packages Standalone Li-Ion Switch Mode Battery Charger June 2003 FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Final Electrical Specifications Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. The LTC ®4002-4.2 is a complete battery charger controller for single cell 4.2V lithium-ion batteries. With a 500kHz switching frequency, the LTC4002-4.2 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 with ±1% accuracy. When the input supply is removed, the LTC4002-4.2 automatically enters a low current sleep mode, dropping the battery drain current to 10 µA. 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, a new charge cycle will automatically begin. The LTC4002-4.2 is available in the 8-lead SO and 10-lead DFN packages. L1 6.8 µH Si6435ADQ 2 3 7 6 1 5 4 8 B330B-13 B330B-13 22 µF CER + 400242 F01 NTC: DALE NTHS-1206N02 10 µF CER 0.1 µF CER 0.47 µF 2.2k 68m Ω Li-Ion BATTERY 10k NTC SENSE GATE BAT CHRG LTC4002ES8-4.2 VCC VIN 5V TO 24V BAT NTC GND COMP 2k CHARGE STATUS T Figure 1. 1.5A Single Cell Li-Ion Battery Charger INPUT VOLTAGE (V) 5 80 VBAT = 4V 90 25 400242 TA02 70 60 10 15 20 100 VBAT = 3.8V ICHRG = 1.5A RSENSE = 68mΩ (CURVES INCLUDE INPUT DIODE) Efficiency vs Input Voltage |
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