Order this document by MC33470/D
MC33470
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:
SYNCHRONOUS
RECTIFICATION DC/DC
CONVERTER
PROGRAMMABLE
INTEGRATED CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
20
1
•
•
•
•
•
•
•
•
•
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
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
PIN CONNECTIONS
G2
1
2
PV
CC
PGnd
3
20
G1
19
OUTEN
18
VID0
17
VID1
16
VID2
15
VID3
14
VID4
13
Pwrgd
12
Fault
11
OT
AGnd
4
VCC
5
Sense
6
Imax
7
Ifb
8
SS
9
Compensation
10
(Top View)
ORDERING INFORMATION
Device
MC33470DW
Operating
Temperature Range
TA = 0° to +75°C
Package
SO–20L
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
©
Motorola, Inc. 1997
Rev 0
MOTOROLA ANALOG IC DEVICE DATA
1
MOTOROLA [ MOTOROLA, INC ]
