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PDF MP1497 Data sheet ( Hoja de datos )

Número de pieza MP1497
Descripción High-Efficiency 3A 16V 500kHz Synchronous Step-Down Converter
Fabricantes MPS 
Logotipo MPS Logotipo



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MP1497
The Future of Analog IC Technology
DESCRIPTION
The MP1497 is a high-f requency, synchronous,
rectified, step-down switch mode co nverter with
built in inte rnal power MOSFETs. It offers a
very compact solution to achieve 3A continuous
output curr ent with e xcellent loa d and line
regulation o ver a wide input supply range. The
MP1497 ha s synchronous mode operation fo r
higher efficiency over t he output current load
range.
Current-mode operation provides a fa
st
transient response and eases loop stabilization.
Protective features include
over-current
protection, t hermal shutdown, and external SS
control.
The MP149 7 requires a minimal number of
readily-available external compone nts and is
available in a space-saving 8-pin TSOT23
package.
High-Efficiency, 3A, 16V, 500kHz
Synchronous, Step-Down Converter
FEATURES
Wide 4.5V-to-16V Operating Input Range
80m /30mLow RDS(ON) Internal Power
MOSFETs
Proprietary Switching-Loss–Reduction
Technique
High-Efficiency Synchronous Mode
Operation
Fixed 500kHz Switching Frequency
Can Synchronize to a 200kHz-to-2MHz
External Clock
Externally-Programmabl e Soft-Start
OCP and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in an 8-pin TSOT-23 Package
APPLICATIONS
Notebook Systems and I/O Power
Digital Set-Top Boxes
Flat-Panel Televisions and Monitors
Distributed Power 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
VIN
4.5V-16V C1
22
EN
2 IN
BST 5
MP1497
6 EN/SYNC
SW 3
C3
7 VCC
FB 8
0.1 1 SS GND
C5 4
22
C4
L1
R3
33k
R1
40.2k
R2
13k
3.3V/3A
C2
MP1497 Rev. 1.05
www.MonolithicPower.com
12/26/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
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MP1497 pdf
MP1497 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board in the Design Example section.
TA = 25°C, unless otherwise noted.
MP1497 Rev. 1.05
www.MonolithicPower.com
12/26/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5

5 Page





MP1497 arduino
MP1497 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see Typical Application on page 1).
The feedback resistor (R1) sets the feedback
loop bandwidth in conjunction with the internal
compensation capacitor. R2 is then:
R1
R2 =
V
1OUT
0.807V
The T-type network sho wn in Figur e 4 is high ly
recommended.
FB 8
RT
R1
VOUT
R2
Figure 4: T-Type Network
Table 1 list s the recommended T-t ype resistors
value for common output voltages.
Table 1: Resistor Values for Common Output
Voltages
VOUT (V)
R1 (k) R2
1.0 20.5
(k) Rt
82
(k)
82
1.2 30.1
60.4
82
1.8 40.2
32.4
56
2.5 40.2
19.1
33
3.3 40.2
13 33
5 40.2
7.68
33
Selecting the Inductor
Use a 1µH-t o-10µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current for most applications.
For highest efficiency, select an inductor with a
DC resistance less than 15m. For most
designs, calculate the inductance value with:
L1
=
VOUT ×−(VIN VOUT )
VIIN ×Δ L × fOSC
Where ΔIL is the inductor ripple current.
Choose an inductor ripple curr ent to be
approximately 30% of the maximum load
current. The maximum inductor peak current is:
IL(MAX)
= ILOAD
+
ΔIL
2
Use a larger inductance for impro ved light-load
efficiency.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefor e requires a capacitor
supply the AC current to the
step-down
converter while maintaining the DC input
voltage. Use low-ESR capacitors f or the best
performance, such as ceramic ca pacitors wit h
X5R or X7R dielectrics that have lo w ESR and
small temperature coefficient s. For most
applications, use a 22µF capacitor.
The input capacitor (C1 ) requires a n adequate
ripple curre nt rating b ecause it absorbs th e
input switching current. Estimate the RMS
current in the input capacitor as:
IC1 = ILOAD ×
VOUT
VIN
×⎜⎛⎜1
VOUT
VIN
⎟⎞
The worst-case conditio n occurs at V IN=2VOUT,
where:
IC1
=
ILOAD
2
For simplification, cho ose the input capacitor
with an RMS current ra ting greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, include a small, high-quality,
ceramic capacitor—e.g. 0.1μF—as close to the
IC as possible. When using ceramic capacitors,
make sure that they have enough capacitance
to prevent excessive input voltage ripple.
Estimate the input voltage ripple caused by the
capacitance as:
Δ=VI1N
ILOAD
fSC×
1
×
VOUT
VIN
×
⎜⎟
⎝⎠
VOUT
VIN
Selecting the Output Capacitor
The output capacitor (C2) maintains the DC
output voltage. Use ceramic, tantalum, or low-
ESR elec trolytic capacitors.
Low ESR
capacitors are preferred to keep the output
MP1497 Rev. 1.05
www.MonolithicPower.com
12/26/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
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