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Freescale Semiconductor Electronic Components Datasheet



MC34703

Switch-Mode Power Supply



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MC34703 pdf
Freescale Semiconductor
Technical Data
10A+ Switch-Mode Power
Supply with LDO Regulator
Document Number: MC34703
Rev. 5.0, 8/2006
34703
The 34703 integrated power supply IC is designed to support the
PowerQUICC™ family of MCUs as well as other MCUs and DSPs
requiring a high current core supply. The 34703 incorporates a high-
performance switching regulator for the microprocessor’s core
supply, and a low-dropout (LDO) linear regulator control circuit to
provide I/O and bus voltage.
The switching regulator is an efficient synchronous buck converter
with integrated low RDS(ON) high side and low side FETs.
Temperature and current sensing is built in and provides protection
for the IC as well as the external circuitry.
The 34703 incorporates specific advanced protection features for
use with high power processors and controllers, including power-up
and power-down sequencing of the I/O and core supply voltages in
relation to each other.
INTEGRATED POWER SUPPLY IC
Features
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Wide input Operating Voltage Range: 2.8 V to 13.5 V
Adjustable Output Voltages
Continuous Core Voltage Supply Currents up to 10 A (with
infrequent excursions to 12 A permitted)
Undervoltage Lockout
Selectable Power Sequencing
Programmable Watchdog Timer
Voltage Margining via I2C Bus
Overcurrent Protection
Reset with Programmable Power-ON Delay
PNB SUFFIX
98ASA10705D
33-PIN PQFN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34703PNB/R2 -40 to 85°C
33 PQFN
2.8 to 13.5 V
I2C
Bus
Optional
34703
VIN2
VBST
VBST (sense)
VBD
FREQ
CLKSYN
SDA
SCL
EN1
EN2
CLKSEL
ADDR
VDDI
VIN1
LDRV
ISNS
LDO
LCMP
SR
LFB
RESET
BOOT
SW_A
SW_B
VOUT
COMP
INV
RT
MCU
VDDH (I/O)
POR
VBST
VDDL (Core)
Figure 1. MC34703 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2006. All rights reserved.



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MC34703 pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VIN1
VBST
VBD
EN1
EN2
RT
RESET
SR
ADDR
SDA
SCL
VIN1 VDDI
Voltage
Regulator
VDDI
Supply
VBST
Bandgap
Vref reference
VDDI
VBST
Linear
Regulator
Boost
Control
2
Vref 3
1
VDDI
Power
Sequencing
Vref
VBST
Powerdown
UVLO
VLDO
Control
with
ILim
Pwr Seq.
Voltage
Margining
VOUT VBST
Current Limit
Reset
Control
POR
Timer
Reset Watchdog Timer
SR
VDDI
INV
SysCon
LFB
Buck
Control
Logic
Buck
HS
and
LS
Driver
Q4
Q1
Q2
Slew
Rate VDDI
57
5 0.8 V
76
6
I2C
Oscillator
Ramp
Generator
Pwr Seq.
Q3
VDDI
LDRV
ISNS
LDO
LFB
LCMP
BOOT
VIN2
SW
PGND
INV
VOUT
CLKSEL CLKSYN FREQ
GND
COMP
Figure 2. 34703 Simplified Internal Block Diagram
34703
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Part Number MC34703
Description Switch-Mode Power Supply
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 30 Pages
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