Battery Charging - LG KP110 Service Manual

3.13 Battery Charging

The MP26021 is a linear, high-performance single cell Li-Ion battery charger.
By integrating high voltage input protection into the charger IC, the MP26021 can Tolerate an input
surge up to 28V
The device features constant current (CC) and constant voltage (CV) charging modes with
programmable charge currents(85mA to 1A), programmable battery full threshold, thermal protection,
battery temperature monitoring, reverse current blocking and trickle charge. The device also provides
AC adapter power good and Charge status indications to the system.
MP26021 is available in a 10-pin 3mm x 3mm QFN package.
CHARGING IC
nCHG_DET
R328
nCHG_EN
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VCHARGE_IO
U405
1 10
IN1 _EN
2 9
GND NC2
3 8
_FLAG NC1
4 7
IN2 OUT2
5 6
IN3 OUT1
11 12
GND_PAD IN_PAD
NCP347MTAHTBG
EUSY0354101
2V8_VEXT
VCHARGE
R314 R315 R326
DNI 100K 470K
0
R320 C357
R329
100K
100K 4.7n
Figure 3.15 CIRCUIT FOR BATTERY CHARGING
3. TECHNICAL BRIEF
VCHARGE
R434 0
R435 0
ICVFP10181E301FR
FL401
IN OUT
GND1 GND2
C431
10u
ECCH0003002
(2012)
(10V,Z,Y5V)
* FL401 : NA
MP26021
TP304
U304
EUSY0352601
1 10
IN BATT
2 9
_CHG ISET
3 8
_ACOK IBF
4 7
_EN SS
5 6
NTC GND
C342
4.7u
- 35 -
C432
56p
(50V,J,NP0)
VBAT
(1%)
R317
3.9K C331
C356 R321 R333 1u
0.1u 20K 620
(5%)
(1%)
LGE Internal Use Only