DC789A

DC789A demonstration circuit is a complete constant current, constant-voltage battery charger for one Lithium-Ion cell and includes a comparator which can be used to monitor battery voltage or other voltages. The LTC4062EDD used on this demo circuit features an internal P-channel power MOSFET with a unique thermal feedback loop that reduces the output current under high ambient temperature and/or high power dissipation conditions. This feature allows the charger to provide higher charge currents under normal conditions and still provide safe charging under abnormal conditions such as high ambient temperature, high input voltage or low battery voltage. Jumpers on the board allow charge currents from 50mA to 1A to be programmed and several charge termination methods to be used. A jumper also selects either the battery voltage or an external voltage for the comparator input.

• 4.3 to 8V (upper range limited by PC board power dissipation) input voltage range VIN
• 3.8V input undervoltage lockout
• 4.2V ±0.5% output float voltage VBAT (constant voltage mode)
• From 50mA to 1A ±8% (selected by jumpers) output current IBAT (constant current mode)
• 1V ±5% current monitor output at full current
• 3 hours ±10% charge termination timer
• 25mA, 50mA, 100mA ±10% charge termination threshold current (IDETECT)
• 2.910V ±3% comparator threshold