ISL95521 Datasheet, PDF (1/2 Pages) Intersil Corporation – Hybrid Power Boost (HPB) and Narrow VDC (NVDC) Configurations Combo Battery Charger with SMBus Interface

DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl95521
Hybrid Power Boost (HPB) and Narrow VDC (NVDC)
Configurations Combo Battery Charger with SMBus
Interface
ISL95521
The ISL95521 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 system bus in
order to help the adapter provide the system power in Turbo mode.
NVDC charger configuration quickly turns on BGATE to enable the
battery to help the adapter provide the system power in Turbo mode.
The ISL95521 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 ISL95521 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 ISL95521 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, it provides several configurable current-sense
resistor value options to achieve the best trade-off of current sensing
accuracy vs power loss.
The ISL95521 uses the Intersil patented Robust Ripple Regulator
(R3™) modulation scheme to provide excellent light load efficiency
and fast dynamic response. It is available in a 32 Ld 4x4mm² QFN
package.
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 removal of battery 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 removal of battery in system Turbo mode
• 16 switching frequency options from 350kHz to 1MHz
• Low quiescent current
• SMBus and auto-increment I²C compatible
• Intersil Robust Ripple Regulator (R3™) modulation scheme
provides excellent light load efficiency and fast dynamic response
• 32 Ld 4x4mm² QFN package
• Pb-free (RoHS compliant)
Applications
• Devices with rechargeable 2-, 3- or 4-cell batteries
VADP ^AFET
ADAPTER
SFET
ASGATE CMSRC
UGATE
HPB
CHARGER
PHASE
LGATE
PROG
BGATE
VBAT
Q1
L
Q2
BFET
VSYS
SYSTEM
VBAT
FIGURE 1. HPB CHARGER CONFIGURATION
AFET
VADP
ADAPTER
SFET
ASGATE CMSRC
UGATE
NVDC
CHARGER
PHASE
LGATE
PROG
BGATE
VBAT
Q1
L
Q2
VSYS
SYSTEM
BFET
VBAT
FIGURE 2. NVDC CHARGER CONFIGURATION
September 23, 2015
1
FN8771.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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