isl9222 Intersil Corporation, isl9222 Datasheet - Page 5

• Manufacturer Part Number: isl9222
• Description: High Input Voltage Charger
• Manufacturer: Intersil Corporation

Description
The ISL9222 charges a Li-ion battery using a CC/CV profile.
The constant current I
R
constant voltage is fixed at 4.2V. If the battery voltage is
below a typical 2.55V trickle-charge threshold, the ISL9222
charges the battery with a trickle current of 19% of I
the battery voltage rises above the trickle charge threshold.
IREF
GND
VIN
PPR
EN
(See Typical Applications circuit on page 4) and the
POR
REF
19% I
is set with the external resistor
OVP
2.55V
4.2V
REF
I
REF
5
200k:
240k:
TRICKLE
JIGIN
PRE
REG
V
REF
FIGURE 2. TYPICAL CHARGE PROFILE
REF
BAT
FIGURE 1. BLOCK DIAGRAM
VCC
CC
V
OS
until
BAT
ISL9222
CONTROL
JIGON
CHARGE
Fast charge CC mode is maintained at the rate determined
by programming I
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
REF
VCC
until the cell voltage rises to 4.2V.
V
+115
REF
DIE
TEMP
O
C
TIME
BAT
March 10, 2008
FN6643.1