SGM41562B

The SGM41562A and SGM41562B are highly integrated, I²C programmable, single-cell Li-Ion or Li-polymer battery chargers with system power path management. They are specifically designed for portable applications requiring minimum board space and small external components. The charging profile includes pre-charge, constant-current and constant-voltage phases. Several safety and protection features are included such as built-in safe charge timer to set maximum duration of charge and pre-charge, input voltage and current monitoring, internal (junction) and external (battery) temperature monitoring, input current limiting and load current limiting. SGM41562A can charge with a wide input voltage range of up to 18V compared to the SGM41562B which has 5.75V charging range, but the rest of their functions are the same.

The SGM41562A/B has 3 power ports: input power port (IN), battery port (BAT) and system or load port (SYS). The system is powered from the input whenever it is available. Input is typically a USB power source. If the input source is weak or removed, power source for the system will automatically switch to the battery. The voltage and currents from input and battery as power sources are continuously monitored to prevent battery damage due to excessive currents or over-discharge.

I²C serial interface is used to program the device functions and parameters or to read its status. 12 read/write or read only 8-bit registers (REG00 to REG0B) are accessible. A watchdog protection feature is also included. If this feature is enabled and there is no in time read/write activity or signal from the host, the device will reset the charging parameters to their defaults and recycles power to the system (turn off/on) that may reset the host.

The SGM41562A is capable of charging with input voltages as high as 18V but with higher input voltages, the chip temperature can easily rise up and thermal protection may stop charging if proper cooling is not considered. The SGM41562B goes into voltage protection state if VIN > 6V. The input changes are continuously monitored and a system power recycle (SYS) may occur if the system does not response to the input toggles.

The SGM41562A/B is available in a Green WLCSP-1.52×1.52-9B package. Device functionality and protection features are assured in the ambient temperature range from -40℃ to +125℃. Charging parameters are guaranteed in 0℃ to +55℃.