MC33470 Datasheet, PDF (1/16 Pages) ON Semiconductor – SYNCHRONOUS RECTIFICATION DC/DC CONVERTER PROGRAMMABLE INTEGRATED CONTROLLER

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Advance Information
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.
MC33470 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
MC33470
SYNCHRONOUS
RECTIFICATION DC/DC
CONVERTER
PROGRAMMABLE
INTEGRATED CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
20
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
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)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC33470DW TA = 0° to +75°C
SO–20L
This document contains information on a new product. Specifications and information herein
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© Motorola, Inc. 1997
Rev 0
1