Battery Charging - LG MG295 Service Manual

3. TECHNICAL BRIEF

3.16 Battery Charging

The ISL6299 accepts two power inputs, normally one from a USB port and the other from a TA.
Charging Process
- Connecting TA & Charger Detection
- Control the charging Current by U102(Charger IC)
- Charging Current flows into the Battery.
Pins of U102 used for charging
- CRDL : Charger supply.
- USB: USB charging supply.
- IMIN: IMIN is the programmable input for the end-of-charge current.
- ICDL: Program the cradle charge current during the constantcurrent mode.
- _EN :Enable logic input
- BAT : Charger output pin.
- _CHG : Charge indication pin.
TA (Travel Adaptor)
- Input voltage: AC 100V ~ 250V, 63Hz
- Output voltage: DC 5.2V
- Output current: Max 700mA
Battery
- Li-ion battery (Max 4.2V, Nom 3.7V)
- Standard battery: Capacity - 830mAh
CHG_EN
R110
100K
LGE Internal Use Only
Charging current flow
USB_VBUS VCHARGE
1
2
6
9
7
5
R111 R112 R113
C139 C140
220K
1u 1u
33K 10K
(1%)
(1%)
Figure 3.15 CIRCUIT FOR BATTERY CHARGING
- 38 -
VBAT 2V8_VEXT
U102 ISL6299
10
CRDL BAT
USB
3
IMIN _PPR
4
_CHG
ICDL
8
USBON GND
11
_EN PGND
C141
1u
Copyright © 2007 LG Electronics. Inc. All right reserved.
CHG_STAT
Only for training and service purposes