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3.10 MiniABB (Battery Charger & MUIC) Interface
VBAT
VDD_IO_1V8
R401
47K
C401
USB_DM
1u
USB_DP
UART_RX
UART_TX
VDD_IO_1V8
R409
10K
I2C_SCL
I2C_SDA
MUIC_INT_N
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 over-voltage protected LDO. Programming is handled via ans 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 specification rev 1.1 form 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 voltage up to +28V, eliminating the
need for and 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.
LGE Internal Use Only
C5
BATT1
D5
BATT2
R403
10
A2
DN
R404
A3
10
DP
A5
U1
U401
A4
U2
LP8727
B1
AUD1
C1
AUD2
A1
MIC
Figure 3-10-1 Mini ABB BLOCK
- 49 -
E4
VBUS1
E5
VBUS2
E3
MUIC_IO_M
D-
E2
MUIC_IO_P
D+
1800
E1
ID
FB403
2.2K
D1
RES
R408
D3
DSS
B5
VUSB_LDO_4V9
EXPDET
D2
CAP
C411
C412
1u
1u
Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
VUSB_CHG_IN
VUSB_CHG_IN
C402
0.1u
MUIC_ACC_ID
R406
DNI
Only for training and service purposes
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