BC3770 Datasheet, PDF (3/45 Pages) Freescale Semiconductor, Inc – 2.0 A Switch-Mode Charger

2 Internal Block Diagram
BC3770
3
VBUS
VBUS
VL
GND
VIO
INTB
SDA
SCL
CHGENB
Input
Current
Detect
Q1
(50m Ω)
Current
Path
Control
PWM
DRV
1.5 MHz
Q2
(50mΩ)
VL
Q3
(70mΩ)
Internal
Regulator
PMID
Reduction
THR
Q4
(30mΩ)
FS I2C
Interface
VBUS
+
AICL
-
+
OVP _-
+
UVLO _-
Tj ⁺
100C _-
+
Tj
150C _-
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
PMID
BOOT
LX
LX
PGND
PGND
VSYS
VSYS
VSYS
CHGOUT
CHGOUT
CHGOUT
BATREG
BATSNSN
NOBAT
SHDNB
Figure 2. BC3770 Simplified Internal Block Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor