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PDF MP4458 Data sheet ( Hoja de datos )
| Número de pieza | MP4458 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
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MP4458
Step-Down
The Future of Analog IC Technology
DESCRIPTION
The MP4458 is a high frequency step-down
switching re gulator with an integrated internal
high-side h igh voltage power MOSFET. It
provides 1 A output with current mode control
for fast loop response and easy compensation.
The wide 3.8V t
o 36V i nput range
accommodates a variety of step-down
applications, including those in automotive
systems. A 120µA operational quiescent current
is su itable for use in batte ry-powered
applications.
The frequen cy foldback helps prevent inductor
current run away during startup and thermal
shutdown provides reliable, fa ult tolerant
operation.
In some ap plications, such as AM radio a nd
ADSL applications, in which the device is
sensitive to frequency band, the MP4458 ca n
avoid the r elated EMI problem by setting the
frequency at 4MHz.
The MP4458 is availablein thin 10-pin 3mm x 3mm
TQFN package.
1A, 4MHz, 36V
Converter
FEATURES
• 120 μA Quiescent Current
• Wide 3.8V to 36V Operating Input Range
• 300m Ω Internal Power MOSFET
• Up to 4MHz Programmable Switching
Frequency
• Ceramic Capacitor Stable
• Internal Soft-Start
• Precision Current Limit without a Current
Sensing Resistor
• Up to 95% Efficiency
• Output Adjustable from 0.8V to 30V
• Available in 10-Pin 3x3mm TQFN Package
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 the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
CONTROL
C6
NS
4 COMP
VIN 8, 9
3 EN
BST 10
MP4458
7 FREQ
SW 1, 2
5 FB
GND 6
C4
100nF
10MQ100N
VIN
36V max
VOUT
5V @ 1A
Efficiency vs
Load Current
100
90
VI=5V
80 VI=24V
70 VI=12V
60
50
40
30 VO=3.3V
20
0 500 1000
LOAD CURRENT (mA)
MP4458 Rev. 1.02
www.MonolithicPower.com
3/4/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP4458 – 1A, 4MHz, 36V STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CURVES
VIN = 12V, VOUT = 5V, fS = 500KHz, TA = +25°C, unless otherwise noted.
MP4458 Rev. 1.02
www.MonolithicPower.com
3/4/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP4458 – 1A, 4MHz, 36V STEP-DOWN CONVERTER
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 th e diode for ward voltage
and recovery times, use a Scho ttky diode.
Choose a diode wh ose maxi mum re verse
voltage rating is great er than the maxi mum
input voltage, and whose curre nt rating is
greater than the maximum load current. Table 3
lists example Schottky diodes an
d
manufacturers.
Table 3—Output Diodes
Manufacturer Part
Voltage Current
Number Rating Rating Package
(V) (A)
Diodes Inc.
B240A-13-F 40V
2A
SMA
Diodes Inc.
B340A-13-F 40V
3A
SMA
Central semi CMSH2-40M 40V 2A SMA
Central semi CMSH3-40MA 40V 3A SMA
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
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
For simplification, cho ose the input capacitor
whose RMS current rating greater than half of
the maximu m load current. The inp ut capacitor
can be electrolytic, tantalum or ceramic. When
using electrolytic or tantalum capacitors, a small,
high qualit y ceramic capacitor, i.e. 0.1 μF,
should be placed as close to the IC as possib le.
When using ceramic capacitors, make sure that
they have enough capacitan ce to provid e
sufficient ch arge to prevent excessive voltage
ripple at inp ut. The input voltage ripple caused
by capacitance can be estimated by:
ΔVIN
=
ILOAD
fS × C1
×
VOUT
VIN
× ⎜⎜⎝⎛1 −
VOUT
VIN
⎟⎟⎠⎞
Where CIN is the input capacitance value.
Output Capacitor
The output capacitor is required to maintain the
DC output voltage. Ceramic, tantalum, or low
ESR electro lytic capacit ors are recommended.
Low ESR capacitors ar e preferred to keep the
output voltage ripple low. The out put voltage
ripple can be estimated by:
ΔVOUT
=
VOUT
fS × L1
×
⎜⎜⎝⎛1
−
VOUT
VIN
⎟⎟⎠⎞ × ⎜⎜⎝⎛RESR
+
8
×
1
fS ×
C2
⎟⎟⎠⎞
Where L is the inductor value, C O is the output
capacitance value, and R ESR is the equivalent
series resistance (ESR) value of the output
capacitor.
In the ca se of cer amic capa citors, the
impedance at the switching f requency is
dominated by the capacitance. The output
voltage ripple is mainly cause
d by the
capacitance. For sim plification, the output
voltage ripple can be estimated by:
ΔVOUT
=
8×
VOUT
fS2 × L1×
C2
×
⎜⎜⎝⎛1 −
VOUT
VIN
⎟⎟⎠⎞
MP4458 Rev. 1.02
www.MonolithicPower.com
3/4/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MP4458.PDF ] | |
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