DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl95521b ISL95521B
Hybrid Power Boost (HPB) and Narrow VDC (NVDC) Combo Battery Charger
with SMBus Interface
The ISL95521B is a highly versatile combo battery
charger configurable for operating as either a Hybrid
Power Boost (HPB) charger or a Narrow VDC (NVDC)
charger, supporting 2-, 3-, or 4-cell batteries. Both
configurations allow the battery to work with the adapter
to supply the system load when it exceeds the adapter
capability, referred to as system Turbo mode. The HPB
charger configuration reverse-boosts battery energy to
the system bus to help the adapter provide the system
power in Turbo mode. The NVDC charger configuration
quickly turns on BGATE to enable the battery to help the
adapter provide the system power in Turbo mode.
The ISL95521B uses N-channel MOSFETs (NFETs) for
all the switches to achieve the best performance and
lowest BOM cost. The internal charge pump is capable of
turning on all the NFETs fast or slow, depending on the
circumstance or the 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 …