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PDF MP1582 Data sheet ( Hoja de datos )
| Número de pieza | MP1582 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP1582
2A, 28V, 1.5MHz
Step-Down Converter
The Future of Analog IC Technology
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – SUPA USE ONLY
DESCRIPTION
FEATURES
The MP1582 is a high frequency step-down
switching regulator with integrated internal
high-side, high voltage power MOSFET. It
Lprovides 2A output with current mode control
for fast loop response and easy compensation.
IAThe wide 4.5V to 28V input range
accommodates a variety of step-down
Tapplications, including those in automotive
systems. A 100µA operational quiescent current
allows use in battery-powered applications.
NHigh power conversion efficiency over a wide
Eload range is achieved by scaling down the
switching frequency at light load condition to
D Ereduce the switching and gate driving losses.
I TThe frequency foldback prevents inductor
current runaway during startup and thermal
Fshutdown provides reliable, fault tolerant
Uoperation.
N BThe MP1582 is available in thermally enhanced
O ISOIC8 package.
• Wide 4.5V to 28V Operating Input Range
• Programmable Switching Frequency up to
1.5MHz
• High-Efficiency Pulse Skipping Mode for
Light Loads
• Ceramic Capacitor Stable
• Internal Soft-Start
• Precision Current Limit without a Current
Sensing Resistor
• Up to 95% Efficiency
• Available in SOIC8 with Exposed Pad
Packages
APPLICATIONS
• Game Machines
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Printer Systems
• Battery Powered Systems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
C TRTYPICAL APPLICATION
S SC4
P I100nF
8
DVIN
7 VIN
BST
SW 1
M TEN
2 EN
FB 4
MP1582
NO6 FREQ
COMP 3
GND
D1
C3
220pF
VOUT
3.3V
Efficiency Curve
(fSW=500kHz)
100
90 VIN=12V
80
70
60 VIN=24V
50
40
30
20
DO5
C6
NS
10
0
0.01
0.1 1
OUTPUT CURRENT (A)
10
MP1582 Rev. 1.0
4/17/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheet4u.net/
1 page  
MP1582 – 2A, 28V, 1.5MHz STEP-DOWN CONVERTER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – SUPA USE ONLY
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT=5V, C1 = 10µF, C2 = 22µF, L1 = 10µH, and TA = +25°C, unless otherwise noted.
Oscillating Frequency
vs Rfreq
1500
L1250
A1000
I750
T500
250
N0
E10 100 1000
Efficiency vs.
Load Current
100
90
80
70 VIN=12V VIN=24V
60
50
40
0
fSW=500kHz
VOUT=2.5V
0.5 1.0 1.5
LOAD CURRENT (A)
2.0
Efficiency vs.
Load Current
100 VIN=12V
90
80 VIN=24V
70
60
50
40
0
fSW=500kHz
VOUT=5V
0.5 1.0 1.5
LOAD CURRENT (A)
2.0
D ESteady State
I TIOUT=0.1A, fSW=500kHz
Steady State
IOUT=1A, fSW=500kHz
Steady State
IOUT=2A, fSW=500kHz
F UVOUT
AC Coupled
10mV/div.
VOUT
AC Coupled
10mV/div.
VOUT
AC Coupled
10mV/div.
ON IBVSW
10V/div.
C RIL
MPS NOT DIST1A/div.
1 v.
VSW
10V/div.
IL
1A/div.
2 v.
VSW
10V/div.
IL
2A/div.
2 v.
DO
MP1582 Rev. 1.0
4/17/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
5
Free Datasheet http://www.datasheet4u.net/
5 Page 
MP1582 – 2A, 28V, 1.5MHz STEP-DOWN CONVERTER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION – SUPA USE ONLY
Table 1—Inductor Selection Guide
Part Number
Inductance (µH) Max DCR (Ω) Current Rating (A)
Dimensions
L x W x H (mm3)
Wurth Electronics
7447789003
L7447789004
744066100
A744771115
I744771122
TDK
TRLF7030T-4R7
SLF10145T-100
NSLF12565T-220M3R5
Toko
EFDV0630-3R3M
D EFDV0630-4R7M
I T919AS-100M
919AS-160M
F U919AS-220M
3.3
4.7
10
15
22
4.7
10
22
3.3
4.7
10
16
22
0.024
0.033
0.035
0.025
0.031
0.031
0.0364
0.0316
0.031
0.049
0.0265
0.0492
0.0776
3.42
2.9
3.6
3.75
3.37
3.4
3
3.5
4.3
3.3
4.3
3.3
3
7.3x7.3x3.2
7.3x7.3x3.2
10x10x3.8
12x12x6
12x12x6
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
N BOutput Rectifier Diode
O IThe output rectifier diode supplies the current to
the inductor when the high-side switch is off. To
C Rreduce losses due to the diode forward voltage
and recovery times, use a Schottky diode.
TChoose a diode whose maximum reverse
voltage rating is greater than the maximum
S Sinput voltage, and whose current rating is
P Igreater than the maximum load current. Table 2
lists example Schottky diodes and
Dmanufacturers.
MTable 2—Diode Selection Guide
TDiodes
OB240A-13-F
DO NCMSH2-40M
Voltage/
Current
Rating
40V, 2A
40V, 2A
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.
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
IC1 = ILOAD ×
VOUT
VIN
×⎜⎜⎛1−
⎝
VOUT
VIN
⎟⎞
⎟
⎠
The worse case condition occurs at VIN = 2VOUT,
where:
IC1
=
ILOAD
2
MP1582 Rev. 1.0
4/17/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
11
Free Datasheet http://www.datasheet4u.net/
11 Page | ||
| Páginas | Total 16 Páginas | |
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