Document Number: MC34716

Rev. 3.0, 5/2007

Freescale Semiconductor

Advance Information

* 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.

1.0 MHz Dual Switch-Mode DDR

Power Supply

The 34716 is a highly integrated, space-efficient, low cost, dual

synchronous buck switching regulator with integrated N-channel

power MOSFETs. It is a high performance point-of-load (PoL) power

supply with its second output having the ability to track an external

reference voltage. it provides a full power supply solution for Double-

Data-Rate (DDR) Memories.

Channel one provides a source only 5.0 A drive capability, while

channel two can sink and source up to 3.0 A. Both channels are highly

efficient with tight output regulation. With its high current drive

memory chipset. The second channel’s ability to track a reference

modern data buses. The 34716 also provides a buffered output

The 34716 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 26-Pin Exposed Pad QFN.

Features

• Input Voltage Operating Range from 3.0 V to 6.0 V

•

±1 % Accurate Output Voltages, Ranging from 0.7 V to 3.6 V

• The second output Tracks 1/2 an External Reference Voltage

•

±1 % Accurate Buffered Reference Output Voltage

• Programmable Switching Frequency Range from 200 kHz to

1.0 MHz

• Programmable Soft Start Timing for Channel One

• Over Current Limit and Short Circuit Protection on Both Channels

• 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.

Figure 1. 34716 Simplified Application Diagram

DUAL SWITCH-MODE DDR POWER

SUPPLY

EP SUFFIX

98ASA10728D

26-PIN QFN

34716

ORDERING INFORMATION

Device

Temperature

Package

MC34716EP/R2

-40 to 85°C

26 QFN

VIN

PVIN1

3.0V to 6.0V

BOOT1

SW1

COMP1

VOUT1

VREFOUT

GND

VREFIN

VDDI

FREQ

PG

STBY

SD

34716

MCU

DDR Memory

Controller

DDR Memory

Chipset

Memory Bus

Termination

VDDQ

PGND1

PVIN2

BOOT2

SW2

INV2

COMP2

VOUT2

PGND2

ILIM1

INV1

Resistors