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PDF MP1430 Data sheet ( Hoja de datos )
| Número de pieza | MP1430 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP1430 is a step-down regulator with an
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 MP1430 requires a minimum number of
readily available external components to
complete a 3A step down DC to DC converter
solution.
TYPICAL APPLICATION
INPUT
6V to 28V
OFF ON
C5
10nF
21
7
IN
EN
BS
SW
3
8 SS
MP1430
FB 5
GND
COMP
4
C6
6
C3
8.2nF
(optional)
D1
B340A
MP1430
3A, 28V, 385KHz
Step-Down Converter
FEATURES
• 3A Output Current
• Programmable Soft-Start
• 110mΩ Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• 20µA Shutdown Mode
• Fixed 385KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 6V to 28V Operating Input Range
• Output Adjustable from 1.22V
• Under Voltage Lockout
• Available in 8-Pin SOIC Package
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
• Flat Panel TVs
• Set-Top Boxes
• Cigarette Lighter Powered Devices
• DVD/PVR Devices
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
OUTPUT
3.3V
3A
MP1430_TAC01
Efficiency vs
Load Current
100
95 VIN = 9V
90
85 VIN = 24V
80
75
VIN = 12V
70
65
60
55
50
0 500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
MP1430_TAC _EC01
MP1430 Rev. 1.0
11/1/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheet4u.com/
1 page  
MP1430 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
OPERATION
IN 2
EN 7
INTERNAL
REGULATORS
OSCILLATOR
SLOPE
COMP
40/385KHz
CLK
+
0.7V --
--
SHUTDOWN
COMPARATOR
LOCKOUT
COMPARATOR
2.3V/
2.6V
+
+
--
CURRENT
SENSE
AMPLIFIER
+
--
+ SQ
RQ
-- CURRENT
COMPARATOR
1.8V
FREQUENCY
FOLDBACK
COMPARATOR
-- 0.7V 1.22V + ERROR
AMPLIFIER
5 FB
6 COMP 8 SS
Figure 1—Functional Block Diagram
5V
1 BS
M1
3 SW
M2
4 GND
MP1430_BD01
The MP1430 is a current-mode step-down
regulator. It regulates input voltages from 6V to
28V down to an output voltage as low as 1.22V,
and is able to supply up to 3A of load current.
The MP1430 uses current-mode control to
regulate the output voltage. The output voltage
is measured at FB through a resistive voltage
divider and amplified through the internal error
amplifier. The output current of the
transconductance error amplifier is presented at
COMP where a network compensates the
regulation control system. The voltage at COMP
is compared to the switch current measured
internally to control the output voltage.
The converter uses an internal N-Channel
MOSFET switch to step-down the input voltage
to the regulated output voltage. Since the
MOSFET requires a gate voltage greater than
the input voltage, a boost capacitor connected
between SW and BS drives the gate. The
capacitor is internally charged while SW is low.
An internal 10Ω switch from SW to GND is used
to insure that SW is pulled to GND when SW is
low to fully charge the BS.capacitor.
MP1430 Rev. 1.0
11/1/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
MP1430 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
PACKAGE INFORMATION
SOIC8N (EXPOSED PAD)
PIN 1 IDENT.
0.229(5.820)
0.244(6.200)
NOTE 2
0.150(3.810)
0.157(4.000)
0.013(0.330)
0.020(0.508)
0.050(1.270)BSC
0.0075(0.191)
0.0098(0.249)
SEE DETAIL "A"
0.011(0.280) x 45o
0.020(0.508)
0.053(1.350)
0.068(1.730)
0.189(4.800)
0.197(5.004)
0o-8o
0.049(1.250)
0.060(1.524)
SEATING PLANE
0.001(0.030)
0.004(0.101)
NOTE:
1) Control dimension is in inches. Dimension in bracket is millimeters.
2) Exposed Pad; 2.55+/- 0.25mm x 3.38 +/- 0.44mm.
Recommended Solder Board Area: 2.80mm x 3.82mm = 10.7mm2 (16.6mil2)
0.016(0.410)
0.050(1.270)
DETAIL "A"
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.
MP1430 Rev. 1.0
11/1/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MP1430.PDF ] | |
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