isl9222a Intersil Corporation, isl9222a Datasheet - Page 5

• Manufacturer Part Number: isl9222a
• Description: High Input Voltage Charger
• Manufacturer: Intersil Corporation

Description
The ISL9222A charges a Li-ion battery using a CC/CV
profile. The constant current I
resistor R
and the constant voltage is fixed at 4.2V. If the battery
voltage is below a typical 2.55V trickle-charge threshold, the
ISL9222A charges the battery with a trickle current of 19% of
I
REF
GND
VIN
PPR
EN
until the battery voltage rises above the trickle charge
IREF
(See Typical Applications circuit on page 4)
POR
19% I
OVP
2.55V
4.2V
REF
I
REF
REF
5
200kΩ
is set with the external
240kΩ
TRICKLE
JIGIN
PRE
REG
V
REF
FIGURE 2. TYPICAL CHARGE PROFILE
BAT
FIGURE 1. BLOCK DIAGRAM
VCC
CC
V
OS
ISL9222A
BAT
CONTROL
JIGON
CHARGE
threshold. Fast charge CC mode is maintained at the rate
determined by programming I
to 4.2V. When the battery voltage reaches 4.2V, the charger
enters a CV mode and regulates the battery voltage at 4.2V
to fully charge the battery without the risk of over charge.
The charger will continue to output the 4.2V voltage until the
CURRENT
CHARGE
IREF
VOLTAGE
CHARGE
EN
CV
VCC
V
+115
REF
DIE
TEMP
REF
O
C
until the cell voltage rises
TIME
BAT
July 28, 2008
FN6704.0