LTC4002-4 DC551A LTC4002EDD LTC4002 B330B Si5435DC DC551A-A LTC4002EDD-4 D104C

LITHIUM-ION BATTERY CHARGER WITH CHARGE TERMINATION LTC4002-4.2 DESCRIPTION Demonstration circuit 551 is a complete

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 551 LITHIUM-ION BATTERY CHARGER WITH CHARGE TERMINATION LTC4002-4 LTC4002-4.2 DESCRIPTION Demonstration circuit 551 is a complete constantcurrent/constant- voltage battery charger designed to charge one Lithium-Ion cell. Programmed for 3A charge current, this board features a 500kHz step down switching regulator controller driving a Pchannel MOSFET. A fixed 3 hour timer is included for charge termination in addition to a charge status LED to indicate a near-full-charge condition and a thermistor connection for battery temperature charge qualification. Because of the heat generated by the circuit, the thermistor must not be mounted on this board. A 10k resistor (R3) is used instead of a thermistor on this board. ® The LTC 4002 on this board is in a tiny 3 X 3 mm 10 pin DFN package. All surface mount components are used to minimize board space and height with the circuitry occupying approximately 0.5 square inches of board space although additional pc-board copper is needed for heat dissipation. Design files for this circuit board are available. Call the LTC factory. LTC is a registered trademark of Linear Technology Corporation Other Features include: · Preset float voltages of 4.2V ±1% · 3A Constant Current (can be programmed for other charge currents) · 3 Hour charge termination timer · NTC Thermistor input for sensing battery temperature · Undervoltage Lockout · Manual Shutdown · Low battery drain current when input supply is removed · C/10 Trickle charge for deeply discharged batteries · Auto recharge when battery voltage drops below preset threshold · C/5 Charge LED indicator (CHRG) 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 551 LITHIUM-ION BATTERY CHARGER WITH CHARGE TERMINATION Typical Demo Board Specifications Input Voltage Range (VIN) 5.2V to 24V Charge Voltage (VBAT) (constant voltage mode) 4.2V ±1% Charge Current IBAT (constant current mode) 3A ±8% Charge Current IBAT (trickle current mode) 350mA ± 20% C/5 CHRG LED Threshold Level 750mA ± 25% Trickle Charge Threshold Voltage 2.9V Battery Drain Current with VIN Removed