BC3770 Datasheet, PDF (37/45 Pages) Freescale Semiconductor, Inc – 2.0 A Switch-Mode Charger

6 Typical Applications
6.1 Introduction
The BC3770 can be configured in several applications. Figure 22 shows the BC3770 in a typical application.
6.1.1 Application Diagram
USB/DCP
Adapter
VBUS
D-
D+
GND
DC up to 6.2 V _VBUS
2.2 μF
Input
Current
Detect
Q1
(50 mΩ)
BC3770
Current
Path
Control
PWM
DRV
1.5 MHz
Q2
(50 mΩ)
VL
Q3
(70 mΩ)
PMID
2.2 μF
BOOT
22 nF
LX ^{1.0 μH 10 μF}
PGND
Application
System
1.0 μF
System I/O
VL
GND
VIO
Interrupt
SDA
SCL
Processor
GPIO
INTB
SDA
SCL
CHGENB
disabled
enabled
Internal
Regulator
PMID
Reduction
THR
Q4
(30mΩ)
FS I2C
Interface
VBUS
+
AICL
-
+
OVP _-
+
UVLO _-
+
Tj
100 C _-
Tj ⁺
150 C _-
I2C bit,
SUSPEND=0
& CHGEN=1
Charger
Enabled
All other enable
conditions=1
ITrickle
Iprechg
Linear
BUCK PWM,
+
CC, CV,
-
Registers
& I2C
VL
INTERFACE
CONTROL
BLOCK
Weak
Battery
VTH
THERMAL REGULATION
THERMAL SHUTDOWN
VTrickle
Vprechg
+
VTH_TRK
-
+
- ^Vpre-chg
I2C
disable
connected on the PCB
Figure 22. Typical Applications
VSYS
CHGOUT
4.7 μF
BATREG
BATSNSN
IFAST_CHG
Idischarge
+
-
NOBAT
CHG disabled
CHG enabled
VF _1-Cell
/ID
Li-Ion
Battery
SHDNB
Processor
GPIO
I2C enabled
I2C disabled
BC3770
37
Analog Integrated Circuit Device Data
Freescale Semiconductor