SY7656 is a single-chip IC specially designed for charging/discharging applications of small-capa- ity lithium batteries, integrating a linear charger with charging current of 1.0 A, a synchronous boost output with maximum discharge current of 1.0A, and a built-in power MOS. The integrated battery status detection, LED Driver and KEY function provide a simple and easy-to-use solution for the small-capacity lithium batteries (lithium ion or lithium polymer). There are two versions in terms of KEY function and discharging module on/off function. SY7656 is available in a ESOP8 package.
Linear charger with 1.0A charging current
Adjustable charging current based on temperature
Preset 4.2V floating charge voltage with ±1% accuracy
92% discharging efficiency
5.1V synchronous boost output, 1MHz switch frequency for discharger
10mA discharge cut-off current
Over-current, short-circuit, over-voltage and over-temperature protections of discharging module
KEY function and LED indication, customizable version and function:
SY7656_2L: KEY not required, boost constant output; LED display automatic off at low load; charge/discharge indication by 2 LEDs
SY7656_KEY2L: Click KEY to display the battery status and turn on/off the boost, automatic shutdown (VOUT down to 0V); charge/discharge indication by 2 LEDs
SY7656_4L: KEY not required, boost constant output; LED display automatic off at low load; charge/discharge indication by 4 LEDs
SY7656_KEY4L: Click KEY to display the battery status and turn on/off the boost, automatic shutdown (VOUT down to 0V); charge/discharge indication by 4 LEDs
Charge/discharge applications of small-capacity lithium batteries
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SY7656