34701_07 Datasheet, PDF (2/38 Pages) Freescale Semiconductor, Inc – 1.5 A Switch-Mode Power Supply with Linear Regulator

INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VIN1
VIN
8.0 V
VBST
VDDI
VDDI
Internal
Supply
VDDI
VBST
VBST
VBD
EN1
EN2
RST
RT
ADDR
SDA
SCL
Q5
Boost
Control
Reset
Q6
Control
POR
Timer
I²C
Control
I²C
Interface
VREF
Power
Enable
VDDI
VREF Bandgap
Voltage
Reference
VREF
VDDI
Reset
Power
Sequencing
Voltage Margining
Watchdog Timer
VDDI
VREF
VLDO
Power
Down
VOUT
Linear
To Reset
Control
Regulator
Control
LDRV
CS
LDO
ILim
LFB
Power
Seq
LCMP
Q4
UVLO
VBST
VBST
BOOT
SysCon
INV
LFB
I²C
Control
Thermal
Limit
SysCon
SoftSt
Current Limit
VDDI
Buck
Control
Logic
Buck
HS
and
LS
Driver
VIN2
(2)
Q1
SW
(2)
Q2
Switcher
Oscillator
300 kHz
Ramp
Gen.
PWM
Comp
Error
Amp
+
-
To Reset
+ ^{0.8 V Control}
-
PGND
(2)
INV
VOUT
VOUT
Power
Seq
Q3
CLKSEL CLKSYN FREQ
GND ⁽⁴⁾
34701
2
Figure 2. 34701 Simplified Internal Block Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor