DATASHEET
ISL78693
Automotive Single-Cell LiFePO4 Battery Charger
FN8891
Rev 1.00
December 12, 2016
The ISL78693 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.
Features
• Complete charger for single-cell Lithium chemistry batteries
• Integrated power transistor and current sensor
• Reverse battery leakage 700nA
The ISL78693 operates as a linear charger when the AC
adapter is a voltage source. The battery is charged in a
Constant Current/Constant Voltage (CC/CV) profile. The charge
current is programmable with an external resistor up to 1A.
The ISL78693 can also work with a current-limited adapter to
minimize the thermal dissipation.
• 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
The ISL78693 features charge current thermal foldback to
ensure 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.
• 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
Related Literature
• For a full list of related documents, visit our website
- ISL78693 product page
• Backup battery systems
CONSTANT
CURRENT
MODE
CONSTANT
VOLTAGE
MODE
TRICKLE
MODE
INHIBIT
VIN
INPUT VOLTAGE
VCH
BATTERY
PACK
ISL78693
BATTERY VOLTAGE
5V
VIN
V
BAT
R
1
C
C1
10µF
2
R
100k
VTRICKLE
1
100k
+
-
TEMP
2x10µF
FAULT
STATUS
EN
R
1k
1
V2P8
IREF
ICHARGE
R
160k
1
EN
C3
TIME
GND
1µF
CHARGE CURRENT
CTIME
15nF
I
CHARGE/10
TIMEOUT
FIGURE 2. TYPICAL CHARGE CURVES USING A CONSTANT
VOLTAGE ADAPTER
FIGURE 1. TYPICAL APPLICATION
‘
FN8891 Rev 1.00
December 12, 2016
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