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3. TECHNICAL BRIEF
- 49 -
LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.10 Battery Charger Interface
Figure 3-10-1 BATTERY CHARGER BLOCK
The LP8727 is designed to provide automatic multiplexing switches between Micro/Min USB connector and
USB, UART and Audio paths in cellular phone applications, and it also contains a single-input Li-Ion battery
charger and ad over-voltage protected LDO.
Programming is handled via an I2C compatible Serial Interface allowing control of charger, multiplexing
switches, and reading status information of the device.
The multiplexing switches on USB and UART support High-Speed USB and Audio inputs can be driven to
negative voltage rail. The LP8727 is compatible with USB charging specifications rev 1.1 from USB IF.
The Li-Ion charger requires few external components and integrates the power FET.
Charging is thermally regulated to obtain the most efficient charging rate for a given ambient temperature.
It has Over-Voltage Protection (OVP) circuit at the charger input protects the PMU from input voltages up to
+28V, eliminating the need for any external protection circuitry.
AN over-voltage protected LDO which can supply up to 50mA is designed for powering up low voltage USB
transceiver or waking up a PMU (Power Management Unit) when an external power source (either USB VBUS
or wall adapter) is connected to the USB connector.
The LP8727 PMU is available in 25-Bump 0.4mm pitch Thin Micro SMD package(2.015mm* 2.015mm).
From External Source
(Travel Adaptor or USB)
R206
27
R205
27
U200
EAN61833301
LP8727
C5
D2
B5
D3
D1
E1
E2
E3
E5
E4
A1
C1
B1
A4
A5
A3
A2
D5
4
D
4
C
3
C
2
C
2
B
3
B
4
B
L
C
S
A
D
S
¬
¡
T
N
I
1
D
N
G
2
D
N
G
3
D
N
G
4
D
N
G
BATT2
DN
DP
U1
U2
AUD1
AUD2
MIC
VBUS1
VBUS2
D-
D+
ID
RES
DSS
EXPDET
CAP
BATT1
10K
R210
VDD_IO_1V8
2.2u
C201
VBUS_USB
FB201
1800
R207
2.2K
1u
C215
1u
C214
VBAT
UART_RX
UART_TX
VUSB_LDO_4V9
I2C_SDA
I2C_SCL
MUIC_ACC_ID
ABB_INT_N
USB_DM
USB_DP
MUIC_IO_M
MUIC_IO_P
From External Source
(Travel Adaptor or USB)