ISL78692 Datasheet, PDF (1/18 Pages) Intersil Corporation – Li-ion/Li-Polymer Battery Charger

DATASHEET
Li-ion/Li-Polymer Battery Charger
ISL78692
The ISL78692 is an integrated single-cell Li-ion or Li-polymer
battery charger capable of operating with an input voltage
as low as 2.65V (cold crank case). This charger is designed to
work with various types of AC adapters or a USB port.
The ISL78692 operates as a linear charger when the AC
adapter is a voltage source. The battery is charged in a CC/CV
(constant current/constant voltage) profile. The charge current
is programmable with an external resistor up to 1A. The
ISL78692 can also work with a current-limited adapter to
minimize the thermal dissipation.
The ISL78692 features charge current thermal foldback to
guarantee safe operation when the printed circuit board’s
thermal dissipation is limited due to space constraints.
Additional features include preconditioning of an
over-discharged battery, an NTC thermistor interface for
charging the battery in a safe temperature range and
automatic recharge. The device is specified for operation in
ambient temperatures from -40°C to +85°C and is offered in
a 3x3mm thermally enhanced DFN package.
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• UG001, “ISL78692EVAL1Z Evaluation Board User Guide”
Features
• Complete charger for single-cell Lithium chemistry batteries
• Integrated power transistor and current sensor
• Reverse battery leakage 700nA
• 1% initial voltage accuracy
• Programmable CC current up to 1A
• Charge current thermal foldback
• NTC thermistor interface for battery temperature alert
• Accepts CV and CC types of adapters or USB bus power
• Preconditioning trickle charge
• Guaranteed to operate down to 2.65V after start-up
• Ambient temperature range: -40°C to +85°C
• AEC-Q100 qualified
Applications
• Automotive systems
• eCall systems
• Backup battery systems
5V
C1
10µF
EN
R₁
100k
ISL78692
R₁
100k
VIN
FAULT
V_BAT
TEMP
STATUS
V2P8
EN
IREF
CTIME
15nF
TIME
GND
R₁
160k
R₁
1k
C3
1µF
BATTERY
PACK
C₂
2x10µF
+
-
TRICKLE
MODE
CONSTANT
CURRENT
MODE
V_IN
INPUT VOLTAGE
V_CH
V_TRICKLE
I_CHARGE
CONSTANT
VOLTAGE
MODE
INHIBIT
BATTERY VOLTAGE
CHARGE CURRENT
I_CHARGE/10
TIMEOUT
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. TYPICAL CHARGE CURVES USING A CONSTANT
VOLTAGE ADAPTER
September 10, 2014
1
FN8692.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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