mc33702 Freescale Semiconductor, Inc, mc33702 Datasheet - Page 22

• Manufacturer Part Number: mc33702
• Description: 3.0 A Switch-mode Power Supply With Linear Regulator
• Manufacturer: Freescale Semiconductor, Inc

+3.3 V
+3.3V
+3.3V
Supply
Voltage
33702
22
Supply
Supply
Voltage
Voltage
RESET
to MCU
Reset
Reset
to MCU
to MCU
100k
100k
+3.3 V or
5.1k
5.1k
R
V
V
Rt
Rt
t
+3.3V
+3.3V
V
V
10k
10k
LDO
LDO
LDO
10 F
R
R
or
or
10 F
LDO
pd
pd
10uF
10uF
10uF
10uF
C
C
C
C
10 H
10uH
10uH
L
L
IN
IN
BST
BST
C
BST
BST
Ct
Ct
t
RESET
RESET
ADDR
ADDR
V
V
VBST
VBST
100nF
100nF
SDA
SDA
SCL
SCL
VIN1
VIN1
V
VBD
VBD
BST
IN1
BD
RT
RT
EN1
EN1
EN2
EN2
8.0V
8.0V
CLKSEL
CLKSEL
Interface
Interface
Control
Control
I
2
I
I
I
I
I
2
2
2
2
2
C
C
C
Control
Control
Control
Control
Control
C
C
C
Boost
Boost
Boost
Reset
Reset
Timer
Timer
POR
POR
Figure 20. Simplified Block Diagram and Typical Application
VIN
VIN
CLKSYN
CLKSYN
V
IN
Oscillator
Oscillator
Switcher
Switcher
300kHz
300kHz
INV
INV
LFB
LFB
Vref
Vref
Freescale Semiconductor, Inc.
Vref
Vref
SysCon
SysCon
Thermal
Thermal
Vref
Vref
For More Information On This Product,
Limit
Limit
Reset
Reset
+
+
+
-
-
-
(Optional)
(Optional)
FREQ
FREQ
R
R
F
F
Reference
Reference
VBST
VBST
Bandgap
Bandgap
V
Voltage
Voltage
VDDI
VDDI
APPLICATION INFORMATION
BST
V
Enable
Enable
Power
Power
DDI
Voltage Margining
Voltage Margining
Comp.
Comp.
Comp.
Slope
Slope
Slope
Watchdog Timer
W-dog Timer
W-dog Timer
Control
Control
Sequencing
Sequencing
SoftSt
SoftSt
I
I
I
2
SysCon
SysCon
2
2
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Power
Power
C
C
C
VDDI
VDDI
Comp.
Comp.
V
Internal
Internal
PWM
PWM
Supply
Supply
V
VDDI
VDDI
DDI
DDI
(4)
(4)
GND
GND
Control
Control
Control
VDDI
VDDI
V
+
+
+
Buck
Buck
Buck
Logic
Logic
Logic
-
-
-
DDI
VLDO
VLDO
Current
Current
V
V
VOUT
VOUT
Power
Power
Down
Down
Vref
Vref
V
VDDI
VDDI
Limit
Limit
LDO
OUT
VDDI
VDDI
V
Error
Error
Amp.
Amp.
DDI
DDI
Pow. Seq.
Pow. Seq.
PWR Seq.
Regulator
Regulator
Regulator
PWR Seq.
Control
Control
Control
UVLO
UVLO
Linear
Linear
Linear
V
VBST
VBST
Pow.
Pow.
+
+
+
Seq.
Seq.
I
-
-
-
I-lim
I-lim
I-lim
V
VBST
VBST
LIM
Driver
Driver
Driver
BST
Buck
Buck
Buck
HS
HS
HS
BST
LS
LS
LS
0.8V
0.8V
&
&
&
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
VOUT
VOUT
V
To Reset
To Reset
Control
Control
OUT
V
VBST
VBST
Q4
Q4
BST
Q3
Q3
Q1
Q1
Q2
Q2
100pF
100pF
LCMP
LCMP
VDDI
VDDI
(2)
(2)
(2)
(2)
BOOT
BOOT
2 x 10 F
V
LDO
LDO
LFB
LFB
LDRV
LDRV
CS
CS
2 x 10 uF
2 x 10 uF
V
(2)
(2)
VIN2
VIN2
DDI
PGND
PGND
INV
INV
VOUT
VOUT
SW
SW
V
IN2
OUT
C
C
1.5k
1.5k
IN
IN
1.0 uF
1.0 uF
?k
?k
?k
?k
?k
?k
6.8nF
6.8nF
C
C
B
B
R
R
0.068 R
0.068 R
S
S
Q
Q
R
R
b
b
LDO
LDO
0.1uF
0.1uF
0.1 F
D
D
?k
?k
C
C
B
B
5 x 2.2 uF
5 x 2.2 uF
5 x 2.2 F
V
V
+3.3V
+3.3V
Supply
Supply
Voltage
Voltage
V
LDO
LDO
+3.3 V
Supply
Voltage
LDO
LDO
?
?
LDO
4.7 H
4.7 uH
4.7 uH
?k
?k
VBST
VBST
@ 1.0A
@ 1.0A
V
@ 1.0 A
L1
L1
= 2.5V
= 2.5V
= 2.5 V
BST
?pF
?pF
V
V
V
OUT
C
C
50 uF
50 uF
50 F
OUT
OUT
O
O
@ 3.0 A
= 1.8 V
@
@
= 1.8V
= 1.8V
3.0 A