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PDF MP1423 Data sheet ( Hoja de datos )
| Número de pieza | MP1423 | |
| Descripción | Step Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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TM
The Future of Analog IC Technology TM
MP1423
3A, 23V, 385KHz
Step-Down Converter
DESCRIPTION
The MP1423 is a step-down regulator with a
built in internal Power MOSFET. It achieves 3A
continuous output current over a wide input
supply range with excellent load and line
regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
Adjustable soft-start reduces the stress on the
input source at turn-on. In shutdown mode the
regulator draws 20µA of supply current.
The MP1423 requires a minimum number of
readily available external components to
complete a 3A step-down DC to DC converter
solution.
FEATURES
• 3A Output Current
• Programmable Soft-Start
• 110mΩ Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic Capacitors
• Up to 94% Efficiency
• 20µA Shutdown Mode
• Fixed 385KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 6V to 23V Operating Input Range
• Output is Adjustable From 1.22V to 21V
• Under Voltage Lockout
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
http://www.DataSheet4U.net/
TYPICAL APPLICATION
INPUT
6V to 23V
OPEN =
AUTOMATIC
STARTUP
2 1 10nF
7 IN
EN
BS 3
SW
MP1423
8
SS
GND
4
FB
COMP
5
6 B330A
10nF
OPEN
5.6nF
OUTPUT
2.5V
3A
MP1423_TAC01
Efficiency vs Load Current
100
VOUT=5.0V
90
80 VOUT=2.5V
70 VOUT=3.3V
60
50
0
VIN = 10V
0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1423_EC01
MP1423 Rev. 1.1
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
TM
MP1423 – 3A, 23V, 385KHz STEP-DOWN CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to FB
pin. The voltage divider divides the output
voltage down to the feedback voltage by the
ratio:
VFB
=
VOUT
R2
R1 + R2
Where VFB is the feedback voltage and VOUT is
the output voltage.
Thus the output voltage is:
VOUT
=
1.22
×
R1+ R2
R2
A typical value for R2 can be as high as 100kΩ,
but a typical value is 10kΩ. Using that value, R1
is determined by:
R1 = 8.18 × (VOUT − 1.22)(kΩ)
For example, for a 3.3V output voltage, R2 is
10kΩ, and R1 is 17kΩ.
Inductor
The inductor is required to supply constant
current to the output load while being driven by
the switched input voltage. A larger value
inductor will result in less ripple current that will
result in lower output ripple voltage. However,
the larger value inductor will have a larger
physical size, higher series resistance, and/or
lower saturation current. A good rule for
determining the inductance to use is to allow
the peak-to-peak ripple current in the inductor
to be approximately 30% of the maximum
switch current limit. Also, make sure that the
peak inductor current is below the maximum
switch current limit. The inductance value can
be calculated by:
L
=
VOUT
fS × ∆IL
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where VIN is the input voltage, fS is the 385KHz
switching frequency, and ∆IL is the peak-to-
peak inductor ripple current.
Choose an inductor that will not saturate under
the maximum inductor peak current.
The peak inductor current can be calculated by:
ILP
= ILOAD
+
VOUT
2 × fS × L
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where ILOAD is the load current.
Table 1 lists a number of suitable inductors
from various manufacturers. The choice of
which style inductor to use mainly depends on
the price vs. size requirements and any EMI
requirement.
Table 1—Inductor Selection Guide
Vendor/
Model
Core
Type
Core
Material
Package
Dimensions
(mm)
WL H
Sumida
CR75
Open
CDH74 Open
CDRH5D28 Shielded
CDRH5D28 Shieldedhttp://www.DataSheet4U.net/
CDRH6D28 Shielded
CDRH104R Shielded
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
Ferrite
7.0 7.8
7.3 8.0
5.5 5.7
5.5 5.7
6.7 6.7
10.1 10.0
5.5
5.2
5.5
5.5
3.0
3.0
Toko
D53LC
Type A
D75C
D104C
D10FL
Shielded Ferrite 5.0 5.0 3.0
Shielded
Shielded
Open
Ferrite
Ferrite
Ferrite
7.6 7.6
10.0 10.0
9.7 1.5
5.1
4.3
4.0
Coilcraft
DO3308
DO3316
Open
Open
Ferrite 9.4 13.0 3.0
Ferrite 9.4 13.0 5.1
MP1423 Rev. 1.1
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
TM
0.387 (9.830)
0.367 (9.322)
MP1423 – 3A, 23V, 385KHz STEP-DOWN CONVERTER
PIN 1 IDENT.
PDIP8
0.325(8.255)
0.300(7.620)
0.260 (6.604)
0.240 (6.096)
0.040 (1.016)
0.020 (0.508)
0.065 (1.650)
0.050 (1.270)
0.014 (0.356)
0.008 (0.200)
0.392(9.957)
0.332(8.433)
3°~11°
Lead Bend
0.035 (0.889)
0.015 (0.381)
0.140(3.556)
0.120(3.048)
0.145(3.683)
0.134(3.404)
0.100 BSC(2.540)
0.021(0.533)http://www.DataSheet4U.net/
0.015(0.381)
NOTE:
1) Control dimension is in inches. Dimension in bracket is millimeters.
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP1423 Rev. 1.1
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MP1423.PDF ] | |
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