Data Sheet

© 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5400 Family • Rev. 1.10 3
FAN5400 Family — USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator
Block Diagram
PWM
MODULATOR
Q1
Q2
Q1A
Q1B
ISNS
PMID
SW
PGND
PMID
L1
VBAT
C
MID
+
Battery
CSIN
1H
4.7F
C
BAT
SYSTEM
LOAD
VREF
SDA
SCL
OTG/USB#
VCC
VBUS
C
BUS
1F
STAT
I2C
INTERFACE
LOGIC
AND
CONTROL
POWER
OUTPUT
STAGE
PMID
OSC
30mA
C
OUT
0.1F
R
SENSE
Q3
CHARGE
PUMP
VBUS
OVP
I_IN
CONTROL
VREG
C
REG
1F
DAC
DISABLE
1.8V / PMID REG
Figure 2. IC and System Block Diagram
Q2
PMID
C
IN2
VBUS
C
IN1
Q1
Q1B
SW
PGND
L1
VBAT
1H
C
OUT
+
Battery
R
SENSE
68m
C
BAT
SYSTEM
LOAD
Q3
Q1A
CHARGE
PUMP
CSIN
Figure 3. Power Stage
PMID
Q1A
Q1B
Greater than VBAT
ON
OFF
Less than VBAT
OFF
ON