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34712 Datasheet PDF

34712
Freescale Semiconductor

Part Number 34712
Description DDR Switch-Mode Power Supply
Page 23 Pages
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Freescale Semiconductor
Advance Information
3.0 A 1.0 MHz Fully Integrated
DDR Switch-Mode Power
Supply
Document number: MC34712
Rev. 4.0, 5/2007
34712
The 34712 is a highly integrated, space efficient, low cost, single
synchronous buck switching regulator with integrated N-channel
power MOSFETs. It is a high performance point-of-load (PoL) power
supply with the ability to track an external reference voltage.
Its high efficient 3.0 A sink and source capability combined with its
voltage tracking/sequencing ability and tight output regulation, makes
it ideal to provide the termination voltage (VTT) for modern data buses
such as Double-Data-Rate (DDR) memory buses. It also provides a
buffered output reference voltage (VREF) to the memory chipset
The 34712 offers the designer the flexibility of many control,
supervisory, and protection functions to allow for easy implementation
of complex designs. It is housed in a Pb-Free, thermally enhanced,
and space efficient 24-Pin Exposed Pad QFN.
Features
www.DataSheet4U.com
• 45 mIntegrated N-Channel Power MOSFETs
• Input Voltage Operating Range from 3.0 V to 6.0 V
±1 % Accurate Output Voltage, Ranging from 0.7 V to 1.35 V
±1 % Accurate Buffered Reference Output Voltage
• Programmable Switching Frequency Range from 200 kHz to
1.0 MHz with a default of 1.0 MHz
• Over Current Limit and Short Circuit Protection
• Thermal Shutdown
• Output Overvoltage and Undervoltage Detection
• Active Low Power Good Output Signal
• Active Low Standby and Shutdown Inputs
• Pb-Free Packaging Designated by Suffix Code EP.
VIN
(3.0V TO 6.0V)
VDDQ
34712
PVIN
BOOT
VREFIN
SW
SWITCH-MODE POWER SUPPLY
EP SUFFIX
98ARL10577D
24-PIN QFN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34712EP/R2
-40 to 85°C
24 QFN
TERMINATING
VTT RESISTORS
VIN VOUT
MCU
VDDI
INV
FREQ
GND
COMP
VREFOUT
SD PGND
STBY
PG
VIN
VDDQ
MEMORY
BUS
DDR MEMORY
CHIPSET
VREF
VDDQ
DDR MEMORY
CONTROLER
Figure 1. 34712 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., 2007. All rights reserved.

















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