1
®
FN9271.1
ISL9214
Li-ion/Li-Polymer Battery Charger
Accepting Two Power Sources
The ISL9214 is a fully integrated low-cost single-cell Li-ion or
Li-polymer battery charger. The charger accepts two power
inputs, normally one from a USB (Universal Serial Bus) port
and the other from a desktop cradle. The ISL9214 is an ideal
charger for smart handheld devices that need to
communicate with a personal computer via USB.
The ISL9214 features 28V maximum voltages for both the
cradle and the USB inputs. Due to the 28V rated inputs, low-
cost, large output tolerance adapters can be used safely.
When both inputs are powered, the cradle input is used to
charge the battery. The charge current is programmable for
the cradle input with a small resistor. The end-of-charge
current is also programmable by another external resistor.
The charger incorporates Thermaguard™ which protects the
IC against over temperature. If the die temperature rises
above a typical value of +125°C, a thermal foldback function
reduces the charge current automatically to prevent further
temperature rise. The charger has two indication pins. The
PPR (power present) pin outputs an open-drain logic LOW
when either the cradle or the USB input power is attached.
The CHG (charge) pin is also an open-drain output that
indicates a logic LOW when the charge current is above a
minimum current level. When the charge current is below the
preset minimum current, the CHG pin will indicate a logic
HIGH signal. This status is latched and will be reset under
one of these events: (1) the part is disabled and re-enabled;
(2) the selected input source has been removed and re-
applied, (3) the USBON turns LOW, or (4) the BAT pin
voltage falls below the recharge threshold (~3.9V).
Features
• Complete Charger for Single-Cell Li-ion/Polymer Batteries
• Dual Input Power Sources for Cradle and USB
• Low Component Count
• Integrated Pass Elements
• Fixed 380mA USB Charge Current
• Programmable Cradle Charge Current
• Charge Current Thermaguard™ for Thermal
Protection
• 28V Maximum Voltages for Cradle and USB Inputs
• Adapter Presence and Charge Indications
• Less than 0.5µA Leakage Current off the Battery when No
Input Power Attached
• Programmable End-of-Charge Current
• Ambient Temperature Range: -40°C to +85°C
• No External Blocking Diode Required
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”
Ordering Information
PART #
PART
MARKING
TEMP.
RANGE (°C) PACKAGE
PKG.
DWG. #
ISL9214IRZ
(Note)
214Z -40 to +85
10 Ld 3x3 DFN
(Pb-free)
L10.3x3C
ISL9214IRZ-T
(Note)
214Z -40 to +85
10 Ld 3x3 DFN
(Pb-free)
Tape and Reel
L10.3x3C
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Pinout
ISL9214
10 LD DFN
TOP VIEW
2
3
4
1
5
9
8
7
10
6
BAT
ICDL
GND
USBON
IMIN
CRDL
USB
PPR
CHG
EN
Data Sheet November 30, 2006
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved. Thermaguard is a trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
