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PDF MP1584 Data sheet ( Hoja de datos )

Número de pieza MP1584
Descripción Step-Down Converter
Fabricantes MPS 
Logotipo MPS Logotipo



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No Preview Available ! MP1584 Hoja de datos, Descripción, Manual

The Future of Analog IC Technology
DESCRIPTION
The MP1584 is a high frequency step-down
switching regulator with an integrated internal
high-side high voltage power MOSFET. It
provides 3A output with current mode control for
fast loop response and easy compensation.
The wide 4.5V to 28V input range accommodates
a variety of step-down applications, including
those in an automotive input environment. A
100µA operational quiescent current allows use in
battery-powered applications.
High power conversion efficiency over a wide
load range is achieved by scaling down the
switching frequency at light load condition to
reduce the switching and gate driving losses.
The frequency foldback helps prevent inductor
current runaway during startup and thermal
shutdown provides reliable, fault tolerant
operation.
By switching at 1.5MHz, the MP1584 is able to
prevent EMI (Electromagnetic Interference) noise
problems, such as those found in AM radio and
ADSL applications.
The MP1584 is available in a thermally enhanced
SOIC8E package.
TYPICAL APPLICATION
C4
100nF
8
VIN
7 VIN
BST
SW 1
EN
2 EN
FB 4
MP1584
6 FREQ
COMP 3
GND
5
D1
C3
220pF
C6
NS
MP1584
3A, 1.5MHz, 28V
Step-Down Converter
FEATURES
Wide 4.5V to 28V Operating Input Range
Programmable Switching Frequency from
100kHz to 1.5MHz
High-Efficiency Pulse Skipping Mode for
Light Load
Ceramic Capacitor Stable
Internal Soft-Start
Internally Set Current Limit without a
Current Sensing Resistor
Available in SOIC8E Package.
APPLICATIONS
High Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
VOUT
3.3V
Efficiency Curve
(fSW=500kHz)
100
90 VIN=12V
80
70
60
VIN=24V
50
40
30
20
10
0
0.01
0.1
1
OUTPUT CURRENT (A)
10
MP1584 Rev. 1.0
8/8/2011
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1

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MP1584 pdf
MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT=5V, C1 = 10µF, C2 = 22µF, L1= 10µH, TA = +25C, unless otherwise noted.
Oscillating Frequency
vs. Rfreq
1600
1400
1200
1000
800
600
400
200
0
10
100
1000
10000
Steady State
IOUT=0.1A, fSW=500kHz
VOUT
AC Coupled
10mV/div.
VSW
10V/div.
IL
1A/div.
1 v.
Steady State
IOUT=1A, fSW=500kHz
VOUT
AC Coupled
10mV/div.
VSW
10V/div.
IL
1A/div.
2 v.
Steady State
IOUT=2A, fSW=500kHz
VOUT
AC Coupled
10mV/div.
VSW
10V/div.
IL
2A/div.
2 v.
MP1584 Rev. 1.0
8/8/2011
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5

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MP1584 arduino
MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER
Table 1—Inductor Selection Guide
Part Number
Wurth Electronics
7447789003
744066100
744771115
744771122
TDK
RLF7030T-3R3
RLF7030T-4R7
SLF10145T-100
SLF12565T-220M3R5
Toko
FDV0630-3R3M
FDV0630-4R7M
919AS-100M
919AS-160M
919AS-220M
Inductance (µH) Max DCR () Current Rating (A)
3.3 0.024
10 0.035
15 0.025
22 0.031
3.42
3.6
3.75
3.37
3.3 0.02
4.7 0.031
10 0.0364
22 0.0316
4.1
3.4
3
3.5
3.3 0.031
4.7 0.049
10 0.0265
16 0.0492
22 0.0776
4.3
3.3
4.3
3.3
3
Dimensions
L x W x H (mm3)
7.3x7.3x3.2
10x10x3.8
12x12x6
12x12x6
7.3x6.8x3.2
7.3x6.8x3.2
10.1x10.1x4.5
12.5x12.5x6.5
7.7x7x3
7.7x7x3
10.3x10.3x4.5
10.3x10.3x4.5
10.3x10.3x4.5
Output Rectifier Diode
The output rectifier diode supplies the current to
the inductor when the high-side switch is off. To
reduce losses due to the diode forward voltage
and recovery times, use a Schottky diode.
Choose a diode whose maximum reverse
voltage rating is greater than the maximum
input voltage, and whose current rating is
greater than the maximum load current. Table 2
lists example Schottky diodes and
manufacturers.
Table 2—Diode Selection Guide
Diodes
B340A-13-F
CMSH3-40MA
Voltage/
Current
Rating
40V, 3A
40V, 3A
Manufacturer
Diodes Inc.
Central Semi
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter
while maintaining the DC input voltage. Use low
ESR capacitors for the best performance. Ceramic
capacitors are preferred, but tantalum or low-ESR
electrolytic capacitors may also suffice.
For simplification, choose the input capacitor
with RMS current rating greater than half of the
maximum load current.
MP1584 Rev. 1.0
8/8/2011
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
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