INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
SD
PG
M1
Thermal
Monitoring
System
Reset
I LIMIT
System
Control
Internal
Voltage
Regulator
V DDI
M2
VIN
BOOT
Discharge
V IN V BOOT
PVIN
FREQ
Prog Frequency
Oscillator
Buck
Control
Logic
F SW
Gate
Driver
I SENSE
M3
SW
ILIM
Prog Soft Start
I SENSE
Current
Monitoring
I LIMIT
VDDI
V DDI
PWM
Comparator
M4
PGND
Bandgap
Regulator
V BG
Ramp
Generator
Error
Amplifier
COMP
INV
VREFIN
Reference
GND
V BG
Selection
M5
VOUT
Discharge
Figure 2. 34713 Simplified Internal Block Diagram
34713
Analog Integrated Circuit Device Data
2
Freescale Semiconductor
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