Quick Start Guide for Demo Board DC364A-A and DC364A-B Demonstration boards DC364A-A and DC364A-B are complete constant-current/constant-voltage battery chargers designed to charge one Lithium-Ion cell. Both feature the LTC1732 Linear Battery Charger driving a P-channel MOSFET in a series pass linear regulator configuration for charging at a maximum current of 700mA (limited by the power dissipation capabilities of the pass transistor). Demo board DC364A-A features the LTC1732-4, which has a recharge threshold voltage of 3.8V, making it suitable for charging 4.1V or 4.2V cells (selectable by jumper on the demo board). Demo board DC364A-B features the LTC1732-4.2, which is recommended only for charging a 4.2V cell, due to its recharge threshold voltage of 4.05V. Other Features include: Preset float voltages of 4.1 and 4.2V 1% (DC364A-A) 700mA Constant Current (can be programmed for other charge currents) 3-hour charge termination timer. This timer can be set for other time periods through a capacitor change. For instance, you may want to use a much shorter period (on the order of 30 seconds) when evaluating the board with a battery simulator instead of a Li-Ion battery. Manual Shutdown C/10 Trickle charge for deeply discharged batteries Auto recharge when battery voltage drops below preset threshold (3.8V for DC364A-A and 4.05V for DC364A-B). Low battery drain current when the input supply is removed Input Power OK LED indicator (ACPR) C/10 Charge LED indicator (CHRG) Small surface mount components are used to minimize board space and height with the circuitry occupying approximately 0.15 square inches of board space with a height of 0.054 inches (1.4mm). DC364A-A and DC364A-B Quick Start Guide Page 1 of 1 Typical Demo Board Specifications Item Specification Input Voltage Range 4.7V to 5.3V (upper range limited by MOSFET dissipation) Output Voltage V (constant voltage mode) BAT 4.1 or 4.2V 1% DC364A-A 4.2V 1% DC364A-B (use for 4.2V cells only) Output Current I (constant current mode) BAT 700mA 8% Output Current I (trickle current mode) 100mA 40% BAT C/10 CHRG LED Threshold Level 80mA 50% Trickle Charge Threshold Voltage 2.457V Battery Drain Current with V Removed IN 3A Note: If V is pulled down to 0V, the IN current drain from the battery will be higher due to the leakage current of the input Schottky diode. A silicon diode could be used for the input diode if the slightly greater forward voltage drop is not a problem. Test Equipment Required for Demo Board Evaluation Item Specification Digital voltmeter for measuring input voltage 3.5 digits Digital voltmeter for measuring battery voltage 4.5 digits, resolution to 1mV Digital voltmeter for measuring voltage across 3.5 digits, resolution to 1mV current sense resistor Li-Ion cell or Battery Simulator Li-Ion Cell 4.1 or 4.2V Rechargeable Li-Ion Cell Battery Simulator Power supply with coarse and fine output 0 to 5V, 2A voltage adjust controls Power resistor (preload for power supply) 2 , 10W Current sense resistor for measuring 0.1 , 1%, 1W charge current Current sense resistor for measuring 1k, 1%, 0.5W battery drain current DC364A-A and DC364A-B Quick Start Guide Page 2 of 2