TYPICAL APPLICATIONS
VIN1
VIN
+3.3V
Supply
Voltage
VDDI
VDDI
Internal
Supply
CIN
10uF
1.0 uF
VDDI
VBST
VBD
8.0V
VBST
VBST
Power
Enable
7.75V
CBST
10uF
LDRV
-
QLDO
+
Vref
CS
10uH
LBST
VDDI
Vref
VDDI
RS
0.022 R
Linear
Regulator
Control
VLDO=3.3V
@1.0A
LDO
Q5
Boost
Control
Bandgap
Voltage
Reference
Vref
Vref
I-lim
4.7k
1.5k
LFB
+3.3V
CLDO
5 x 2.2 uF
VDDI
or
EN1
EN2
VLDO
LCMP
100pF
1.5k
Pow. Seq.
VLDO
Q4
Power
Power
Down
6.8nF
Sequencing
Voltage Margining
W-dog Timer
5.1k
VBST
UVLO
VBST
RST
RESET
RST
to MCU
Reset
Reset
Control
VOUT
BOOT
VBST
Q6
Current
Limit
SysCon
INV
POR
Timer
VIN2
(2)
RT
I2C
Control
+3.3V
Supply
Voltage
VDDI
LFB
Buck
HS
&
LS
Driver
CIN
Rt
100k
Ct
Q1
Q2
2 x 22 uF
I2C
Control
100nF
SysCon
SoftSt
DB
0.1uF
L1
CB
VOUT=1.8V
Thermal
Limit
Buck
Control
Logic
SW
(2)
4.7 uH
+
ADDR
SDA
CO
100 uF
Rpd
I2C
PGND
(2)
300k
10k
Interface
Error
Amp.
PWM
To Reset
Control
0.8V
+
Switcher
Comp.
SCL
Oscillator
300kHz
+
-
INV
39k
-
VOUT
Q3
Ramp
Gen.
Rb
27k
300
VOUT
470pF
Pow.
Seq.
FREQ
RF
(4)
GND
CLKSYN
CLKSEL
(Optional)
Figure 33. Simplified Block Diagram and Basic Application
34701
Analog Integrated Circuit Device Data
Freescale Semiconductor
34
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