SY7638 is a single-chip IC specially designed for charging/discharging applications of small-capacity lithium batteries, integrating a switch charger with charging current of 0.5A (customizable 0.25A/1A), a synchronous boost output with maximum discharge current of 1.2A, and a power MOS. The integrated battery status detection, LED Driver and KEY function provide a simple and easy-to-use solution for the application of small-capacity lithium batteries (lithium ion or lithium polymer). including constant charging current, LED battery display, KEY function and automatic load identification. SY7638 is available in a SOP8 package.
Standby power loss: 75uA
Switch charger with 0.5A default charging current, 0.25A/1A customizable
90% discharging efficiency @1A
Switch frequency for charger: 1MHz
Charging in three stages: trickle current mode, constant current mode and constant voltage mode
Adaptive adapter for adjusting charging current
Adjustable charging current based on temperature
10%ICC charge Termination curren,automatic recharge
Preset 4.2V floating charge voltage with ±1% accuracy
5.05V synchronous boost output
Switch frequency for discharge: 1MHz
93% discharging efficiency
7mA discharge cut-off current
Over-current, short-circuit, over-voltage and over-temperature protections of discharging module
LED Driver, charge/discharge indication and abnormality indication by 4 LEDs by default, customizable 1*LED, 2*LED and 2*LED turn light
Customizable KEY function and automatic load identification (default): click KEY for battery fuel gauge display and to activate the discharging module; automatic load identification; long press KEY to shut down output
Customizable version:
(1) Click KEY for battery gauge display and to activate/deactivate the discharging module; without automatic load identification function;
(2) Click KEY for battery gauge display and to activate/deactivate the discharging module; with automatic load identification function.
Charge/discharge applications of small-capacity lithium batteries