fn8955 rev.1.00 page 1 of 2 feb 14, 2018 fn8955 rev.1.00 feb 14, 2018 ISL88739B hybrid power boost (hpb) battery charger with smbus interface data short to request the full datasheet, please visit www.intersil.com/products/ISL88739B the ISL88739B is a highly versatile battery charger configurable as a hybrid power boost (hpb) charger, supporting 2-, 3-, or 4-cell batteries. the configuration allows the battery to work with the adapter to supply the system load when it exceed s the adapter capability, referred to as turbo mode. the hpb charger configuration reverse-boosts b attery energy to the system bus to help the adapter provide the system power in turbo mode. the ISL88739B uses n-channe l mosfets (nfets) for all the switches to achieve the best performance and lowest bom cost. the inter nal charge pump can turn on all the nfets quickly or s lowly, 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 i n turbo mode or in battery learn mode. the ISL88739B provides many protection features including a prochot# in dicator for system low voltage, adapter overcurrent , battery overcurrent, or overheating, with an array of smbus programmable parameters for maximum flexi bility. it also features hardware-based adapter-current limit and battery-current limit in addition to smbus programmable limits. the ISL88739B provides a high accuracy adapter current monitor, battery current monitor, and system power monitor outputs. several con figurable current-sense resistor value options provide maximum flexibility for working with high and low power systems, to achieve the best trade-off of current se nsing accuracy v s power loss. the ISL88739B uses the renesas robust ripple regulator (r3?) modulation scheme to provide excellent light-load efficiency and fast dynamic response. it is available in a 32 ld 4x4mm 2 qfn package. features ? configurable as an hpb charger ? compliant with intel prochot# and psys requirements ? adapter current monitor and battery discharging current monitor ? uses nfet for all switches ? supports battery removal during battery learn mode ? actively controlled inrush current to prevent fet damage ? smbus programmable se ttings and h igh accuracy ? comprehensive protect ion features include: ? prochot# indicator for system low voltage, adapter overcurrent, bat tery overcurrent, or system overheating ? hardware-based adapte r current and battery current limits ? sudden battery removal support in turbo mode ? 16 switching frequency options from 350khz to 1mhz ? low quiescent current ? smbus and auto-increment i 2 c compatible ? renesas robust ripple regulator (r3) modulation scheme provides excellent light-load efficiency and fast dynamic response ? 32 ld 4x4mm 2 qfn package ? pb-free (rohs compliant) applications ? devices with rechargeable 2 -, 3-, or 4-cell batteries figure 1. hpb charge r configuration l adapter system bgate lgate phase ugate vadp vsys vbat bfet hpb charger cmsrc asgate vbat afet sfet q 1 q 2 prog
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