DC606A

DC606A demonstration circuit is single cell Li-Ion linear charger in a SOT-23. The demo features the LTC4056-4.2 charger IC. Charge rates as high as 700mA can be achieved. The user is provided with two control jumpers to select between ON/OFF and 450mA/700mA charge rates. The reduced charge rate is suitable for USB applications. A charge LED illuminates while the charger is charging the battery. This charger implements a constant current, and constant voltage charge scheme. Charge termination is based on a timer. A topping off charge will be applied if the cell voltage falls to 4.05V to insure long-term charge maintenance. Deeply discharged cells are conditioned with a low C/50 trickle current until the cell voltage reaches 2.9V whereupon full charge current is applied. A charge LED is provided that illuminates every time the charger is charging the battery. The peak charge current is jumper selectable at either 700mA or 450mA. The 450mA rate is intended for USB applications.

• 4.25V to 6.5V input voltage
• 450mA +- 7% Iout (450mA selected Vbat=3.6V) and 700mA +-7% (700mA selected Vbat=3.6V) Iout
• 4.20V+-1% float voltage at Vin =5V
• 2.9V +-0.05V trickle charge threshold at VIN = 5V
• 4.05V+-50mV recharge threshold at Vin 5V