FN8952 Rev.0.00 Page 1 of 2
Aug 10, 2017
FN8952
Rev.0.00
Aug 10, 2017
ISL95521B
Hybrid Power Boost (HPB) and Narrow VDC (NVDC) Combo Battery Charger
with SMBus Interface
DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl95521b
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
Learn mode.
The ISL95521B provides many protection features
including a PROCHOT# indicator for system low
voltage, adapter overcurrent, battery overcurrent, or
overheating, with an array of SMBus programmable
parameters for maximum flexibility. It also features a
hardware-based adapter-current limit and battery-current
limit in addition to SMBus programmable limits.
The ISL95521B provides a high accuracy adapter current
monitor, battery current monitor, and system power
monitor outputs. To provide maximum flexibility for
working with high and low power systems, it provides
several configurable current-sense resistor value options
to achieve the best trade-off of current sensing accuracy
vs power loss.
The ISL95521B uses the Intersil’s 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 or NVDC charger
• Compliant with Intel PROCHOT# and PSYS
requirements
• Adapter current monitor and battery discharging
current monitor
• Uses NFET for all the switches
• Supports battery removal during Battery Learn
mode
• Actively controlled inrush current to prevent FET
damage
• SMBus programmable settings and high accuracy
• Comprehensive protection features include:
• PROCHOT# indicator for system low voltage,
adapter overcurrent, battery overcurrent, or
system overheating
• Hardware-based adapter current and battery
current limits
• Supports sudden battery removal in system Turbo
mode
• 16 switching frequency options from 350kHz to 1MHz
• Low quiescent current
• SMBus and auto-increment I
2
C compatible
• Intersil 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
Related Literature
• For a full list of related documents, visit our website
• ISL95521B
product page
