DATASHEET
ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
Li-ion Battery Charger
FN9252
Rev 3.00
September 30, 2016
The ISL9205, ISL9205A, ISL9205B, ISL9205C, and ISL9205D
Features
are integrated single-cell Li-ion or Li-polymer chargers capable
• Complete charger for single-cell Li-ion/polymer batteries
• Integrated pass element and current sensor
• No external blocking diode required
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 family 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 by a Constant Voltage phase (CC/CV). The charge
current during the Constant Current phase is determined by
• Low component count and cost
• 25mV voltage accuracy over-temperature and input voltage
range
• 15mV voltage accuracy at room temperature
• Programmable charge current
the external resistor connected to the I
pin. When the
REF
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.
• Programmable end-of-charge current (ISL9205)
• Charge current thermal foldback for thermal protection
(Thermaguard)
• Trickle charge for fully discharged batteries
• Power presence and charge indications
• NTC interface (not available in some package options)
The ISL9205 family incorporates Thermaguard, which protects
the IC against over-temperature. If the die temperature rises
above a typical value of +100°C, the thermal foldback
function reduces the charge current to prevent further
temperature rise. The ISL9205 includes an external
• Less than 3µA leakage current off the battery when no input
power attached or charger disabled
• Ambient temperature range: -40°C to +85°C
• DFN, QFN packages
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. Two logic inputs and two open-drain logic outputs
are available for controlling the charger and indicating the
charger status. The EN pin enables the charger. The TOEN pin
(available in ISL9205) enables the 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.
• Pb-Free (RoHS compliant)
Applications
• Mobile phones
• Bluetooth devices
• PDAs
• MP3 players
• Stand-alone cradle or travel chargers
• Other handheld devices
Related Literature
• For a full list of related documents, visit our website
- ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D
product pages
FN9252 Rev 3.00
Page 1 of 17
September 30, 2016
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