GENERAL DESCRIPTION
The XB4908 SERIES product is a high i
ntegration solution for lithium-ion/polymer
battery protection. XB4908 SERIES contai
ns advanced power MOSFET, high-accura
cy voltage detection circuits and delay circ
uits. XB4908 SERIES is put into an ultra-s
mall ESN4 package and only one external
component makes it an ideal solution in li
mited space of battery pack.
XB4908 SERIES has all the protection fu
nctions required in the battery application i
ncluding overcharging, over-discharging, o
vercurrent and load short circuiting protecti
on etc. The accurate overcharging detectio
n voltage ensures safe and full utilization c
harging. The low standby current drains littl
e current from the cell while in storage.
The device is not only targeted for digital
cellular phones, but also for any other Li-Io
n and Li-Poly battery-powered information
appliances requiring long-term battery life.

FEATURES
 Protection of Charger Reverse Connec
-tion
 Protection of Battery Cell Reverse Con
-nection Without external load
 Integrated Advanced Power MOSFET
with Equivalent of 13.5 mΩ RSS(ON)
 Ultra-small ESN4 Package
 Only One External Capacitor Required
 Over-temperature Protection
 Overcharge Current Protection
 Two-step Overcurrent Detection
-Over-discharge Current
-Load Short Circuiting
 Low Current Consumption
-Operation Mode: 3.3µA typ
-Power-down Mode: 1.8µA typ
 Charger Detection Function
 0V Battery Charging Function
 Delay Times are generated inside
 High-accuracy Voltage Detection
 RoHS Compliant and Lead (Pb) Free

APPLICATIONS
One-Cell Lithium-ion Battery Pack
Lithium-Polymer Battery Pack