Battery Charging - LG KP210 Service Manual

3. TECHNICAL BRIEF

3.14 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 U203(Charger IC)
- Charging Current flows into the Battery.
Pins of U203 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.
TA (Travel Adaptor)
- Input voltage: AC 100V ~ 250V, 63Hz
- Output voltage: DC 5.1V
- Output current: Max 700mA
Battery
- Li-ion battery (Max 4.2V, Nom 3.7V)
- Standard battery: Capacity - 800mAh
External Charger
[Rev.C] Change External Charging IC (ISL6294 -> ISL6299)
USB_DET
_CHG_EN
LGE Internal Use Only
USB_VBUS
R253
C226
1u
100K
Figure 3.14 CIRCUIT FOR BATTERY CHARGING
- 42 -
VCHARGE
Charging current flow
U203 ISL6299
1
CRDL BAT
2
USB
6
IMIN _PPR
_CHG
9
ICDL
7
USBON GND
5
_EN PGND
C227 R252
C442
47p
1u 100K
Copyright © 2008 LG Electronics. Inc. All right reserved.
VBAT
10
3
4
8
11
C228
1u
Only for training and service purposes