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  ON Semiconductor Electronic Components Datasheet  

MC33470 Datasheet

Synchronous Rectification DC/DC Converter Programmable Integrated Controller

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MC33470 pdf
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
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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
August, 2006 − Rev. 4
1
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


  ON Semiconductor Electronic Components Datasheet  

MC33470 Datasheet

Synchronous Rectification DC/DC Converter Programmable Integrated Controller

No Preview Available !

MC33470 pdf
MC33470
18 VID0
17
Voltage
Identification 16
Code
Input 15
VID1
VID2
VID3
14 VID4
Digitally Programmed
Reference
OT 11 Outen 19 VCC 5
Over
Temp
Vref
VCC
Oscillator
VCC
9 10 mA
2.5 V
1.5 V
PWM
Comparator
SS
+
0.96 Vref
90 mA
Over Current
Detect
190 mA
En
SQ
RQ
PWM
Latch
Delay
6
Sense
13
Power
Good
Vref
800 m
+
1.04 Vref
20 mA
OTA Error Amp
+
1.04 Vref
+
0.93 Vref
1.14 Vref
Delay
R
Q
S
7
Imax
2
PVCC
20
G1
8
Ifb
1
G2
3
PGND
14
Fault
AGND 4
Compensation 10
Figure 1. Simplified Block Diagram
MAXIMUM RATINGS (TC = 25°C, unless otherwise noted.)
Rating
Power Supply Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOutput Driver Supply Voltage (Operating)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁImax, Ifb Inputs
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁAll Other Inputs and Digital (OT, Fault, Power Good) Outputs
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Dissipation and Thermal Characteristics
Maximum Power Dissipation
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁCase 751D DW Suffix (TA= 70°C)
Thermal Resistance, Junction−to−Ambient
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁThermal Resistance, Junction−to−Case
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Junction Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Ambient Temperature (Note 1)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage Temperature Range
Symbol
VCC
PVCC
Vin
Vin
PD
RqJA
RqJC
TJ
TA
Tstg
Value
7.0
18
−0.3 to 18
−0.3 to VCC + 0.3
0.60
91
60
125
0 to +70
−55 to +125
Unit
V
V
V
V
W
°C/W
°C/W
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. ESD data available upon request
http://onsemi.com
2


Part Number MC33470
Description Synchronous Rectification DC/DC Converter Programmable Integrated Controller
Maker ON Semiconductor
Total Page 15 Pages
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