The complementary PWM outputs can directly drive external PMOS and NMOS transistors thus allowing it to implement synchronous rectifier boost or buck functions. With a conversion efficiency of up to 94%, these features combine to make the device extremely suitable for single lithium battery power bank applications.

The internal 2.4V reference voltage, which has a tolerance of ±1%, is used as a reference voltage source for the A/D Converter as well as the over voltage and over current protection circuits. The device includes a resistance divider which permits the A/D Converter to detect the battery voltage as well as the input/output voltage. The device also provides pull-high and pull-low resistors for the PMOS and NMOS transistors to reduce the number of required external component thus reducing the PCB size.

With regard to other internal functions, the device includes a Flash program memory of 2K×16, a data memory of 128×8, an operating voltage of 2.5V~5.5V, up to 18 multi-function I/O pins, an integrated 30MHz high frequency RC oscillator, a 32kHz low frequency RC oscillator, a 7 external channel 12-bit resolution A/D Converter, a single 10-bit PTM and a single 16-bit STM. As for packaging, the device is supplied in both 16-pin NSOP and 20-pin SSOP package types.