BC3770 Datasheet, PDF (4/45 Pages) Freescale Semiconductor, Inc – 2.0 A Switch-Mode Charger

3 Pin Connections
TRANSPARENT
TOP VIEW
1
2
3
A VBUS
VBUS
VL
4
5
SCL
SDA
B PMID
BOOT
BAT
SNSN
VIO
INTB
C LX
NO
BAT
GND
BAT
REG
CHG
OUT
D LX
CHG
ENB
SH
DNB
VSYS
CHG
OUT
E PGND
PGND
VSYS
VSYS
CHG
OUT
Figure 3. BC3770 Pin Connections (Transparent Top View)
Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on page 13.
Table 2. BC3770 Pin Definitions
Pin
Pin Name
Pin
Function
Formal Name
Definition
A1, A2
A3
A4
A5
B1
B2
B3
B4
VBUS
VL
SCL
SDA
PMID
BOOT
BATSNSN
VIO
Input
Output
Input
Input/
Output
Output
USB/DCP Adapter Input
Connect the pins to the output of USB or DCP (dedicated Charging Port)
adapter. Bypass with a 2.2 F/10 V ceramic capacitor to the ground, in case the
peak voltage on the pins is always below 10 V due to a clamp device. Otherwise,
a 2.2 F/25 V or higher rating capacitor is recommended. The two VBUS pins
must be connected together externally. These pins are used as an output in OTG
mode. An embedded 100 kdischarge resistance is enabled in Charge mode.
It is disconnected in the Boost mode.
Internal Regulator Output
The analog output for internal reference, bandgap and so on. DO NOT LOAD.
Bypass with a 1.0 F/10 V to ground.
Clock Input for FS I²C
Serial Interface with the
Processor
Use a pull-up resistor, 1.5 k to 2.2 k, to the VIO.
Data I/O for FS I²C Serial
Interface with the Processor
Use a pull-up resistor, 1.5 k to 2.2 k, to the VIO.
VBUS Bypass Output
High-side MOSFET connection node and VBUS bypass output. Bypass with a
2.2 F ceramic capacitor to PGND pins as close as possible. Do NOT LOAD any
external applications.
High-side MOSFET Driver
Supply
Bypass BOOT to LX with a 22 nF/10 V ceramic capacitor.
Battery - Terminal Sensing
Connect to negative terminal of battery cell as close as possible. If a sense
resistor is used for a fuel gauge, connect the pin to the ground terminal of the
sense resistor.
Supply for Internal Buffer Connect to the system I/O supply voltage rail.
Analog Integrated Circuit Device Data
Freescale Semiconductor
BC3770
4