28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
CIN
AC ADAPTER 1µF
GND
IN
BATT
MAX8845Z
DETBAT
ABI
SAFEOUT
RSETI
2.8kΩ
ABO
SETI
MIN GND
RMIN
1.75kΩ
CHG
POK
EN
EP
4.2V Li+
CBATT
2.2µF
SYSTEM
CSAFEOUT VI/O
1µF
VBUS
RCHG
1MΩ
GPIO
RPOK
1MΩ
GPIO
GPIO
POWER
SUPPLY
ON
Figure 3. AC Adapter Application
______________________________________________________________________________________ 11