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MC33470

Synchronous Rectification DC/DC Converter Programmable Integrated Controller

ON Semiconductor 

MC33470

Synchronous Rectification

DC/DC Converter

Programmable Integrated

Controller

The MC33470 is a digitally programmable switching voltage

regulator, specifically designed for Microprocessor supply, Voltage

Regulator Module and general purpose applications, to provide a high

power regulated output voltage using a minimum of external parts. A

5−bit digital−to−analog converter defines the dc output voltage.

This product has three additional features. The first is a pair of high

speed comparators which monitor the output voltage and expedite the

circuit response to load current changes. The second feature is a

soft−start circuit which establishes a controlled response when input

power is applied and when recovering from external circuit fault

conditions. The third feature is two output drivers which provide

synchronous rectification for optimum efficiency.

This product is ideally suited for computer, consumer, and industrial

equipment where accuracy, efficiency and optimum regulation

performance is desirable.

Features

• 5−Bit Digital−to−Analog Converter Allows Digital Control of Output

Voltage

• High Speed Response to Transient Load Conditions

• Output Enable Pin Provides On/Off Control

• Programmable Soft−Start Control

• High Current Output Drives for Synchronous Rectification

• Internally Trimmed Reference with Low Temperature Coefficient

• Programmable Overcurrent Protection

• Overvoltage Fault Indication

• Functionally Similar to the LTC1553

• Pb−Free Packages are Available*

http://onsemi.com

SOIC−20WB

DW SUFFIX

CASE 751D

1

MARKING DIAGRAM

20

MC33470DW

AWLYYWWG

1

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

G = Pb−Free Package

(Note: Microdot may be in either location)

PIN CONNECTIONS

G2 1

PVCC 2

PGND 3

AGND 4

VCC 5

Sense 6

Imax 7

Ifb 8

SS 9

Compensation 10

20 G1

19 OUTEN

18 VID0

17 VID1

16 VID2

15 VID3

14 VID4

13 Pwrgd

12 Fault

11 OT

(Top View)

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

© Semiconductor Components Industries, LLC, 2006

1

August, 2006 − Rev. 4

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 13 of this data sheet.

Publication Order Number:

MC33470/D

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