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PDF MP4561 Data sheet ( Hoja de datos )
| Número de pieza | MP4561 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
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MP4561
Step-Down
The Future of Analog IC Technology
1.5A, 2MHz, 55V
Converter
DESCRIPTION
The MP456 1 is a h igh f requency step -down
switching re gulator w ith integrated in ternal h igh-
side high v oltage p ower MOSFET. It provides
1.5A output with current mode control for fast loop
response and easy compensation.
The wide 3.8V to 55V input range accommodates
a var iety of st ep-down ap plications, including
those in aut omotive inp ut environm ent. A 12µA
shutdown mode su pply current allows use in
battery-powered applications.
High pow er co nversion ef ficiency over a wid e
load range is ac hieved b y sc aling do wn th e
switching f requency at li ght lo ad co ndition to
reduce the switching and gate driving losses.
The fr equency f oldback he lps prevent indu ctor
current run away during sta rtup and thermal
shutdown provides r eliable, fa ult tolerant
operation.
By switching a t 2MH z, th e MP45 61 is ab le to
prevent EMI (Electromagnetic Interference) noise
problems, such a s t hose found in A M radio a nd
ADSL applications.
The MP4561 is availa ble in small 3mm x 3mm
10-pin QFN with exposed pad package.
FEATURES
• Wide 3.8V to 55V Operating Input Range
• 300m Ω Internal Power MOSFET
• Up to 2MHz Programmable Switching
Frequency
• 140 μA Quiescent Current
• Ceramic Capacitor Stable
• External Soft-Start
• Up to 95% Efficiency
• Output Adjustable from 0.8V to 52V
• Available in 3x3mm 10-Pin QFN
APPLICATIONS
• High Voltage Power Conversion
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Battery Powered Systems
All MPS parts are lead-free and adhere to t he RoHS directive. F or MPS green
status, please visit M PS website under Q uality Ass urance. “ MPS” a nd “The
Future of An alog IC Technology” a re Re gistered T rademarks of Mo nolithic
Power Systems, Inc.
TYPICAL APPLICATION
C4
100nF
VIN
C1
10uF
100V
EN
C5
10nF
9 VIN
10
BST
SW 1.2
3 EN
8
SS
MP4561 FB 5
7 FREQ
COMP 4
GND
6
L1
10uH
D1 C7
NS
C3
470pF
C6
NS
C2
22uF
6.3V
VOUT
3.3V
100
90
80
70
60
50
40
0
VIN=12V
VIN=55V
0.5 1
IOUT (A)
1.5
MP4561 Rev. 1.0
11/5/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT =3.3V, C1 = 10µF, C2 = 22µF, L1 = 10µH and TA = +25°C, unless otherwise noted.
Efficiency @VOUT=2.5V
Efficiency @VOUT=5V
Output Voltage Ripple
L1=10uH, fs=500kHz
L1=15uH, fs=500kHz
IOUT=0.1A
100 100
Vin=12V
90 Vin=12V
90
AC CouVpOleUdT
80 80 10mV/div
70
60 Vin=48V
50
40
0
0.5 1
OUTPUT CURRENT (A)
1.5
70 Vin=55V
60
50
40
00
.5 11
OUTPUT CURRENT (A)
Vsw
10V/div
IL
500mA/div
.5
Output Voltage Ripple
IOUT=0.75A
Output Voltage Ripple
IOUT=1.5A
AC CouVpOleUdT
10mV/div
AC CouVpOleUdT
10mV/div
Vsw
10V/div
IL
500mA/div
Vsw
10V/div
IL
1A/div
MP4561 Rev. 1.0
11/5/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
5 Page 
MP4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER
Table 1—Inductor Selection Guide
Part Number
Wurth Electronics
Inductance
(µH)
Max DCR
(Ω)
Current Rating
(A)
Dimensions
L x W x H (mm3)
7447789004 4.7
744066100 10
744771115 15
744771122 22
TDK
0.033
0.035
0.025
0.031
2.9
3.6
3.75
3.37
7.3x7.3x3.2
10x10x3.8
12x12x6
12x12x6
RLF7030T-4R7 4.7
SLF10145T-100 10
SLF12565T-150M4R2 15
SLF12565T-220M3R5 22
Toko
0.031 3.4
0.0364
0.0237
0.0316
3
4.2
3.5
7.3x6.8x3.2
10.1x10.1x4.5
12.5x12.5x6.5
12.5x12.5x6.5
FDV0630-4R7M 4.7
919AS-100M 10
919AS-160M 16
919AS-220M 22
0.049 3.3
0.0265
0.0492
0.0776
4.3
3.3
3
7.7x7x3
10.3x10.3x4.5
10.3x10.3x4.5
10.3x10.3x4.5
Table 2—Diode Selection Guide
Diodes
Voltage/
Current
Rating
Manufacturer
B290-13-F
90V, 2A
Diodes Inc.
B380-13-F
80V, 3A
Diodes Inc.
CMSH2-100M 100V, 2A Central Semi
CMSH3-100MA 100V, 3A 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 volt age. Use lo w
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 curre nt rating g reater than half of th e
maximum load current. The input capacitor (C1)
can be electrolytic, tantalum or ceramic.
When using electrolytic or tantalum capacitors, a
small, high quality ceramic capacit or, i.e. 0.1 μF,
should be placed as clo se to the IC as po ssible.
When using ceramic ca pacitors, m ake sure th at
they have enough capacitance to provide
sufficient charge to pr event excessive voltag e
ripple at input. The input voltage rip ple caused by
capacitance can be estimated by:
ΔVI1N =×fSCIL×OAD 1
VOUT
VIN
⎛⎞
× ⎜⎟
⎝⎠
−
VOUT
VIN
MP4561 Rev. 1.0
11/5/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MP4561.PDF ] | |
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