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MC33470DWG

P1-P3P4-P6P7-P9P10-P12P13-P15
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 4
1 Publication Order Number:
MC33470/D
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*
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
ORDERING INFORMATION
MARKING DIAGRAM
http://onsemi.com
SOIC−20WB
DW SUFFIX
CASE 751D
PIN CONNECTIONS
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
13
7
4
3
A
GND
OT
Fault
P
wrgd
VID4
VID3
VID2
VID1
VID0
11
12
14
15
16
17
18
10
9
8
6
5
(Top View)
Compensation
SS
I
fb
I
max
Sense
V
CC
P
GND
1
G2
OUTEN
G1
19
20
2
P
V
CC
20
1
MC33470DW
AWLYYWWG
MC33470
http://onsemi.com
2
Oscillator
PWM
Comparator
OTA Error Amp
V
CC
Sense
Compensation
P
GND
G1
G2
I
fb
Over Current
Detect
Outen
Power
Good
VID0
VID1
VID2
VID3
V
ref
V
CC
Voltage
Identification
Code
Input
Digitally Programmed
Reference
V
CC
V
ref
R
S
Q
PWM
Latch
+
0.96 V
ref
1.04 V
ref
5
VID4
18
17
16
15
14
410
9
14
3
1
8
20
2
19
0.93 V
ref
1.04 V
ref
13
A
GND
6
SS
800 m
Over
Temp
11
I
max
7
10 mA
2.5 V
1.5 V
En
90 mA
190 mA
S
R
Q
Delay Fault
1.14 V
ref
20 mA
OT
Q
+
+
+
Delay
Figure 1. Simplified Block Diagram
P
V
CC
MAXIMUM RATINGS (T
C
= 25°C, unless otherwise noted.)
Rating Symbol Value Unit
Power Supply Voltage V
CC
7.0 V
Output Driver Supply Voltage (Operating)
P
V
CC
18 V
I
max
, I
fb
Inputs V
in
−0.3 to 18 V
All Other Inputs and Digital (OT, Fault, Power Good) Outputs V
in
−0.3 to V
CC
+ 0.3 V
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation
Case 751D DW Suffix (T
A
= 70°C)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
P
D
R
q
JA
R
q
JC
0.60
91
60
W
°C/W
°C/W
Operating Junction Temperature T
J
125 °C
Operating Ambient Temperature (Note 1) T
A
0 to +70 °C
Storage Temperature Range T
stg
−55 to +125 °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
MC33470
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS (V
CC
= 5.0 V, P
VCC
, = 12 V for typical values T
A
= Low to High [Notes 2, 3, 4], for
min/max values T
A
is the operating ambient temperature range that applies, unless otherwise noted.)
Characteristic Symbol Min Typ Max Unit
OSCILLATOR
Frequency (V
CC
= 4.5 to 5.5 V) f
osc
210 300 390 kHz
FEEDBACK AMPLIFIER
Voltage Feedback Input Threshold (Note 5)
VID0, VID1, VID2 and VID4 = “1” and VID3 = “0”
VID4 = “1” and VID0, VID1, VID2 and VID3 = “0”
V
sense
1.764
2.744
3.43
1.8
2.8
3.5
1.836
2.856
3.57
V
Input Bias Current (V
CM
= 2.8 V) I
IB
− 20 −
mA
Transconductance (V
CM
= 2.8 V, V
COMP
= 2.0 V) G
M
400 800 1200
mmho
Open Loop Voltage Gain (V
COMP
= 2.0 V) A
VOL
− 67 − dB
Output Line Regulation (V
CC
= 4.5 to 5.5 V) Reg
line
− 7.0 − mV
Output Load Regulation Reg
load
− 5.0 − mV
Output Current
Source
Sink
I
OH
I
OL
−
−
120
120
−
−
mA
PWM SECTION
Duty Cycle at G1 Output
Maximum
Minimum
DC
max
DC
min
77
−
88
−
95
0
%
Propagation Delay
Comp Input to G1 Output, T
J
= 25°C
Comp Input to G2 Output, T
J
= 25°C
t
PLH1
t
PLH2
−
−
0.1
0.1
−
−
ms
SOFT−START SECTION
Charge Current (V
Soft−Start
= 0 V) I
chg
7.0 10 13
mA
Discharge Current under Current Limit (Note 6)
(V
Soft−Start
= 2.0 V, V
sense
= V
out
, V
imax
= V
CC
, V
ifb
= 0 V)
I
SSIL
30 90 150
mA
Discharge Current under Hard Current Limit
(V
Soft−Start
= 2.0 V, V
sense
< V
out
/2, V
imax
= V
CC
, V
ifb
= 0 V)
I
SSHIL
40 64 − mA
Hard Current Limit Hold Time t
SSHIL
100 200 300
ms
IMAX INPUT
Sink Current (V
in
max
= V
CC
, V
ifb
= V
CC
) I
OL
133 190 247
mA
POWER GOOD OUTPUT
Threshold For Logic “1” to “0” Transition
Upper Threshold
Lower Threshold
V
th
−
0.93
1.04
0.96
1.07
−
V
sense
Response Time
Logic “0” to “1” (V
sense
changes from 0 V to V
O
)
Logic “1” to “0” (V
sense
changes from V
O
to 0 V)
t
rPG
200
50
400
100
600
150
ms
Sink Current (V
OL
= 0.5 V) I
OLPG
− 10 − mA
Output Low Voltage (I
OL
= 100 mA) (Note 7)
V
OLPG
− 250 500 mV
FAULT OUTPUT
Threshold For Logic “0” to “1” Transition V
thF
1.12 1.14 1.2 V
ref
V
sense
Response Time Switches from 2.8 V to V
CC
t
rF
50 100 150
ms
Sink Current (V
OL
= 0.5 V) I
OLF
− 10 − mA
2. Maximum package power dissipation limits must be observed.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. VID1, VID3, VID4 = logic 0, and VID0, VID2 = logic 1.
5. V
sense
is provided from a low impedance voltage source or shorted to the output voltage.
6. Under a typical soft current limit, the net soft−start discharge current will be 90 mA (I
SSIL
) − 10 mA (I
chg
) = 80 mA. The soft−start sink to source
current ratio is designed to be 9:1.
7. Sense (Pin 6) = 5.0 V, Comp (Pin 10) open, VID4, VID2, VID1, VID0 = 1.0, VID3 = 0.
P
V
CC
P1-P3P4-P6P7-P9P10-P12P13-P15

MC33470DWG

Mfr. #:
Buy MC33470DWG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 5-Bit Synchronous Rectification Buck
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