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ISL9205
Data Sheet
March 20, 2007
FN9252.0
Li-ion Battery Charger
The ISL9205 is an integrated single-cell Li-ion or Li-polymer
charger capable of operating at an input voltage as low as
2.5V. The low operating voltage allows the charger to work
with a variety of AC adapters.
The ISL9205 operates as a linear charger when the AC
adapter is a voltage source. The battery is charged in a
standard Li-ion charge profile, i.e. a constant current phase
followed be a constant voltage phase (CC/CV). The charge
current during the constant current phase is determined by the
external resistor connected to the I
REF
pin. When the adapter
output is a current-limited voltage source and the current limit
is smaller than the programmed constant current of the IC, the
ISL9205 operates as a pulse charger where the charge
current is determined by the current limit of the AC adapter
during the constant current phase. The ISL9205 operates in a
linear mode during the constant voltage phase in both adapter
cases.
The ISL9205 incorporates Thermaguard
TM
which protects the
IC against over temperature. If the die temperature rises
above a typical value of +100掳C, the thermal foldback function
reduces the charge current to prevent further temperature
rise. The ISL9205 includes an external temperature
monitoring function (not available in some package options). A
negative temperature coefficient (NTC) thermistor is
connected between the TEMP pin and GND to monitor the
battery or ambient temperature. The ISL9205 also includes a
timer to set the time reference for various charge time limits.
The timer is programmable with an external capacitor. A logic
input and two open-drain logic outputs are available for
controlling the charger and indicating the charger status. The
EN pin enables the charger. The ISL9205B, ISL9205C, and
ISL9205D incorporate a a timeout function so that the charge
is terminated when the preset time limits have been reached.
The FAULT pin is an open-drain output which turns on when a
fault condition is encountered. The STATUS pin is also an
open-drain output which turns on when the charger is
delivering current.
Features
鈥?Complete Charger for Single-Cell Li-ion/Polymer Batteries
鈥?Integrated Pass Element and Current Sensor
鈥?No External Blocking Diode Required
鈥?Low Component Count and Cost
鈥?25mV Voltage Accuracy Over-Temperature and Input
Voltage Range
鈥?15mV Voltage Accuracy at Room Temperature
鈥?Programmable Charge Current
鈥?Charge Current Thermal Foldback for Thermal
Protection (Thermaguard
TM
)
鈥?Trickle Charge for Fully Discharged Batteries
鈥?Power Presence and Charge Indications
鈥?NTC Interface (ISL9205D)
鈥?Less than 3碌A Leakage Current off the Battery when No
Input Power Attached or Charger Disabled
鈥?Ambient Temperature Range: -40掳C to +85掳C
鈥?DFN Packages
鈥?Pb-free plus anneal available (RoHS compliant)
Applications
鈥?Mobile Phones
鈥?Blue-Tooth Devices
鈥?PDAs
鈥?MP3 Players
鈥?Stand-Alone Cradle or Travel Chargers
鈥?Other Handheld Devices
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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. 2007. All Rights Reserved. Thermaguard is a trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
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