DATA SHORT
To request the full datasheet, visit the
ISL95521A
device page
.
ISL95521A
Hybrid Power Boost (HPB) and Narrow VDC (NVDC) Combo Battery Charger with
SMBus Interface
The
ISL95521A
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 together 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 ISL95521A 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 ISL95521A 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 hardware based adapter current limit and
battery-current limit in addition to SMBus programmable limits.
The ISL95521A provides a high accuracy adapter current
monitor, battery current monitor, and system power monitor
outputs. To provide maximum flexibility for working with high
power and low power systems, the ISL95521A provides
several configurable current-sense resistor value options to
achieve the best trade-off of current sensing accuracy vs power
loss.
The ISL95521A uses the Renesas Robust Ripple Regulator (R3™)
modulation scheme to provide excellent light-load efficiency and
fast dynamic response. The ISL95521A is available in a 32 Ld
4x4mm
2
QFN package.
FN8841
Rev 2.00
Jul.19.19
Features
• Configurable as 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:
- PROCHOT# indicator for system low voltage, adapter
overcurrent, battery overcurrent, and 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
• 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:
•
ISL95521A
device page
VADP AFET
ADAPTER
SFET
VSYS
SYSTEM
ADAPTER
VADP
AFET
SFET
VSYS
SYSTEM
ASGATE CMSRC
UGATE
Q
1
L
BFET
ASGATE CMSRC
UGATE
Q
1
L
BFET
HPB
CHARGER
PROG
PHASE
LGATE
Q
2
VBAT
NVDC
CHARGER
PROG
PHASE
LGATE
Q
2
VBAT
BGATE
VBAT
BGATE
VBAT
FIGURE 1. HPB CHARGER CONFIGURATION
FIGURE 2. NVDC CHARGER CONFIGURATION
FN8841 Rev 2.00
Jul.19.19
Page 1 of 2
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