Battery Charger Interface - LG -T310i Service Manual

3.10 Battery Charger Interface

VBUS_USB
LDO_OUT
C224
0.1u
The RT9524 linear battery chargers safely charges single-cell Li+ batteries.
Charging rate is optimized to accommodate the thermal characteristics of a given application.
There is no need to reduce the maximum charge current or worst-case charger power dissipation.
Charging is optimized for Li+ cells using a control algorithm that includes low-battery precharging,
voltage and current-limited fast charging, and top-off charging, while continuously monitoring for input
overvoltage and device over-temperature.
The charge current and termination threshold are programming by simple one wire serial interfaces.
The charger status is indicated by two open-drain outputs.
The AC adapter charger current is programming by external ISET1 resistor while USB charge current is
programming either 90mA or 400mA through one wire interface.
The RT9524 is available in the tiny 10pin 2mm by 3mm TDFN package.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CHARGING IC
From External Source
From External Source
(Travel Adaptor or USB)
(Travel Adaptor or USB)
1
VIN
2
ISET
3
GND1
4
LDO
5
IEOC
C225
R227
R228
1u
1.2K
3.9K
(25V)
Ichg=530/Riset=481.8mA
Ieoc=Rieoc/200=19.5%(93.95mA)
Figure 3-10-1 BATTERY CHARGER BLOCK
VBAT
11
PGND
10
BATT
9
U201
PGB
8
CHGSB
7
GND2
6
EN_SET
- 49 -
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
1V8_VDD
R211
100K
_EOC
CHG_EN
C223 C255
0.1u
1u
(10V)
LGE Internal Use Only