SGM41538

The SGM41538 and SGM41538B are efficient synchronous multi-chemistry chargers for 1- to 4-cell batteries optimized for high density applications with minimum number of external components. 

Hybrid Power Boost mode (HPB) is supported in which the battery can assist the adapter when the system demand is higher than the adapter rated power. It also features an ultra-fast changeover from charging to discharging and does not crash when switching between different operating modes. 

If the adapter is not present and V_BAT is above the minimum operation system voltage (V_SYSMIN), BATFET will directly connect the battery to the system. Battery-Only-Boost mode is also supported when VBAT drops close to V_SYSMIN or lower. In this case, the Boost converter is activated to boost the low battery voltage and regulate the system voltage until battery stored energy is completely utilized and depleted. 

Device supply source is automatically selected between battery or adapter. The integrated gate drivers for the external N-MOSFETs (ACFET, RBFET and BATFET) are powered by two internal charge pumps. 

The integrated SMBus interface of the SGM41538 and SGM41538B allows the power management controller to accurately set and regulate the input current, charge current, discharge current, and the charge voltage. It also provides a comprehensive set of programmable protection features. 

Adapter current, battery discharge current, and system power are monitored through their respective pins (IADP, IDCHG, PMON) such that the host can throttle the CPU and reduce system power whenever needed. 

The SGM41538 and SGM41538B are available in a Green TQFN-4×4-28BL package and can operate in the -40℃ to +125℃ junction temperature range.