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PDF MP1484 Data sheet ( Hoja de datos )
| Número de pieza | MP1484 | |
| Descripción | 340KHz Synchronous Rectified Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP1484
3A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
The Future of Analog IC Technology
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE – INTERNAL USE ONLY
DESCRIPTION
The MP1484 is a monolithic synchronous buck
regulator. The device integrates top and bottom
85mΩ MOSFETS that provide 3A of continuous
load current over a wide operating input voltage
of 4.75V to 23V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current
at turn-on and in shutdown mode, the supply
current drops below 1µA.
The MP1484 is PIN compatible to the MP1482
2A/23V/Synchronous Step-Down Converter.
FEATURES
• 3A Continuous Output Current
• Wide 4.75V to 23V Operating Input Range
• Integrated 85mΩ Power MOSFET Switches
• Output Adjustable from 0.925V to 20V
• Up to 95% Efficiency
• Programmable Soft-Start
• Stable with Low ESR Ceramic Output Capacitors
• Fixed 340KHz Frequency
• Cycle-by-Cycle Over Current Protection
• Input Under Voltage Lockout
• Thermally Enhanced 8-Pin SOIC Package
APPLICATIONS
• FPGA, ASIC, DSP Power Supplies
• LCD TV
• Green Electronics/Appliances
• Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
2
7 IN
EN
8
SS
GND
4
1
BS 3
SW
FB
COMP
6
5
Efficiency vs
Load Current
100
95
90 VIN = 12V
VIN = 5V
85
80
75
70
65
60
55
50
0.1
1.0
LOAD CURRENT (A)
10
MP1484 Rev. 0.1
3/21/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
1
1 page  
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MP1484 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE – INTERNAL USE ONLY
OPERATION
FUNCTIONAL DESCRIPTION
The MP1484 regulates input voltages from
4.75V to 23V down to an output voltage as low
as 0.925V, and supplies up to 3A of load
current.
The MP1484 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
transconductance error amplifier. The voltage at
the COMP pin is compared to the switch current
(measured internally) to control the output
voltage.
The converter uses internal N-Channel
MOSFET switches to step-down the input
voltage to the regulated output voltage. Since
the high side MOSFET requires a gate voltage
greater than the input voltage, a boost capacitor
connected between SW and BS is needed to
drive the high side gate. The boost capacitor is
charged from the internal 5V rail when SW is low.
When the FB pin voltage exceeds 20% of the
nominal regulation value of 0.925V, the over
voltage comparator is tripped and the COMP
pin and the SS pin are discharged to GND,
forcing the high-side switch off.
+
FB 5
1.1V --
+
0.3V --
SS 8
0.925V
--
+
+
OVP
RAMP
OSCILLATOR
CLK
110/340KHz
ERROR
AMPLIFIER
6µ A
CURRENT
SENSE
AMPLIFIER
+
--
-- S Q
RQ
+ CURRENT
COMPARATOR
2 IN
5V
1 BS
3 SW
COMP 6
EN 7
7V
Zener
--
2.5V +
+
1.5V --
EN OK
LOCKOUT
COMPARATOR
1.2V
SHUTDOWN
COMPARATOR
Figure 1—Functional Block Diagram
OVP
4
IN < 4.10V
GND
IN
INTERNAL
REGULATORS
MP1484 Rev. 0.1
3/21/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MP1484.PDF ] | |
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