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Freescale Semiconductor ?
Advance Information
3.0 A 1.0 MHz Fully Integrated
DDR Switch-Mode Power
Supply
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 (V TT ) for modern data buses
such as Double-Data-Rate (DDR) memory buses. It also provides a
buffered output reference voltage (V REF ) 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
? 50 m ? integrated N-channel power MOSFETs
? Input voltage operating range from 3.0 to 6.0 V
? ? 1% Accurate output voltage, ranging from 0.7 to 1.35 V
? ? 1% Accurate buffered reference output voltage
? Programmable switching frequency range from 200 kHz to
Document number: MC34712
Rev. 6.0, 4/2012
34712
SWITCH-MODE POWER SUPPLY
EP SUFFIX
98ARL10577D
24-PIN QFN
ORDERING INFORMATION
1.0 MHz with a default of 1.0 MHz
? Over-current limit and short-circuit protection
? Thermal shutdown
? Output over-voltage and under-voltage detection
Device
MC34712EP/R2
Temperature
Range (T A )
-40 to 85 °C
Package
24 QFN
? Active low power good output signal
? Active low standby and shutdown inputs
V IN
(3.0 TO 6.0 V)
34712
V DDQ
PVIN
VREFIN
BOOT
SW
V TT
TERMINATING
RESISTORS
VIN
VOUT
VDDI
INV
V DDQ
MEMORY
BUS
FREQ
COMP
DDR MEMORY
CHIPSET
GND
VREFOUT
V REF
V DDQ
MCU
SD
PGND
V IN
DDR MEMORY
CONTROLER
STBY
PG
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., 2007-2012. All rights reserved.
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