UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
DC+
GND
RSNS
0.2Ω
C2
10μF
Q1
2SB1151
R1
VCC
1kΩ
CC
COMP
SNS UB2012 BAT
VCC
TS
VSS
STAT
D1
R2
2kΩ
VCC
RT1
RT2
PACK+
C1
0.1μF
PACK-
TEMP
NTC
Battery
Pack
Figure 1. Low Dropout Single-or Two-Cell Li-Lon/Li-Pol Charger
FUNCTIONAL DESCRIPTION
The UTC UB2012 is designed for the applications of single or two-cell Li-Ion or Li-Pol batteries. Figure 1 is the
schematic of using this advanced linear charge controller with a PNP pass transistor. Figure 2 is the operation
flowchart of UB2012. Figure 3 shows the typical charge profile. Figure 4 is the application schematic of a charger
using P-channel MOSFET..
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 17
QW-R121-018 .b