Description
The ISL88739 is a highly versatile combo battery charger configurable for operating as either a Hybrid Power Boost
n(HPB) charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or 4-cell batteries. Both configurations allow
nthe battery to work with the adapter together to supply the system load when it exceeds the adapter capability,
nreferred to as system Turbo mode. HPB charger configuration reverse-boosts battery energy to the system bus to
nhelp the adapter provide the system power in Turbo mode.NVDC charger configuration quickly turns on BGATE to
nenable the battery to help the adapter provide the system power in Turbo mode.
The ISL88739 uses N-channel MOSFETs (NFETs) for all the switches to achieve the best performance and lowest
nBOM cost. The internal charge pump is capable of turning on all the NFETs fast or slow depending on the circumstance or need. The ability to quickly turn on NFETs prevents system bus voltage drop when the
battery is suddenly removed in Turbo mode or in Battery Learn mode.
