MC34703 Datasheet, PDF (1/46 Pages) Freescale Semiconductor, Inc – 10A+ Switch-Mode Power Supply with LDO Regulator

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 R_DS(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
• 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 (T_A)
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.