1
FN6541.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2008. All Rights Reserved
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ISL9221
Dual Input Lithium Ion Battery Charger
with OVP USB Bypass and 10mA LDO
The ISL9221 Lithium Ion charging IC is designed to meet the
charging requirements of most of today’s handheld devices.
The IC provides two inputs for either USB connection where
the current is limited by the USB standard or for
powering/charging from a power adapter.
If the voltage at either VUSB or VDC pin is within the safe
allowable range, the PPR
pin is pulled low indicating to the
system processor that external power is available.
Charging can be enabled/disabled by controlling the state of
the EN
pin. While charging, the CHG pin is pulled low
indicating the battery is being charged.
The battery is charged to 4.2V with only a 1% error across
the temperature range. USB charge current, Adapter charge
current and charge termination currents can be programmed
via external resistors.
The ISL9221 adds an additional feature in providing a limited
amount of current to system architecture while protecting the
system from destructively high voltage.
The device contains Thermal regulation and protection to
provide additional safety features of this device. When the
temperature exceeds +125°C, the current will fold back to
reduce and control the die temperature.
Features
• Lithium Ion/Polymer battery charging
• Dual input - USB host or car/wall adapter
• Input voltage withstanding up to 28V
• 5.4V overvoltage protection on VUSB inputs
• Charging current up to 1.2A
• 4.9V/10mA linear regulator with input OVP
• Current limit on bypass path
• Programmable end-of-charge current
• Programmable charging current
• Programmable USB current limit
• Charging and power present indicator pins
• Charge enable pin
• Reverse current protection
• Pb-free (RoHS compliant)
Applications
• Smart Handheld Devices
• Cell Phones, PDAs, MP3 Players
• Digital Still Cameras
• Handheld Test Equipment
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
Pinout
ISL9221
(12 LD DFN)
TOP VIEW
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL9221IRZ 9221 -40°C to +85°C 12 Ld 4x3 DFN L12.4x3
ISL9221IRZ-T* 9221 -40°C to +85°C 12 Ld 4x3 DFN L12.4x3
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach materials
and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which
is RoHS compliant and compatible with both SnPb and Pb-free
soldering operations. Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
VDC
VUSB
PPR
CHG
EN
VDC_LDO
BAT
USB_BYP
IVDC
GND
IMIN
2
3
4
1
5
11
10
9
12
8
6 7IUSB
Data Sheet April 3, 2008
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