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PDF MP1470 Data sheet ( Hoja de datos )
| Número de pieza | MP1470 | |
| Descripción | High-Efficiency 2A 16V 500kHz Synchronous Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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MP1470
The Future of Analog IC Technology
DESCRIPTION
The MP1470 is a high-f requency, synchronous,
rectified, st ep-down, switch-mode converter
with internal power MOSFETs. It o ffers a very
compact solution to achieve a 2A continuous
output curre nt over a wide input supply range,
with excellent load and line regulation. The
MP1470 ha s synchronous-mode operation for
higher efficiency over the output current-load
range.
Current-mode operation provides fast transien t
response and eases loop stabilization.
Protection features include
over-current
protection and thermal shutdown.
The MP1470 requires a minimal number of
readily-available, standard,
external
components and is available in a sp ace-saving
6-pin TSOT23 package.
TYPICAL APPLICATION
High-Efficiency, 2A, 16V, 500kHz
Synchronous, Step-Down Converter
In a 6-Pin TSOT 23
FEATURES
• Wide 4.7V-to-16V Operating Input Range
• 163m Ω/86mΩ Low-RDS(ON) Internal Power
MOSFETs
• Proprietary Switching-Loss–Reduction
Technique
• High-Efficie ncy Synchronous-Mode
Operation
• Fixed 500kHz Switching Frequency
• Internal AAM Power-Save Mode for High
Efficiency at Light Load
• Internal Soft-Start
• Over-Current Protection and Hiccup
• Thermal Shutdown
• Output Adjustable from 0.8V
• Available in a 6-pin TSOT-23 package
APPLICATIONS
• Game Consoles
• Digital Set-Top Boxes
• Flat-Panel Television and Monitors
• General Purposes
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.
VIN
GND
EN
3 IN
BST 6
U1
SW 2
MP1470
5 EN
GND
1
FB 4
R3
75k
3.3V/2A
R1
40.2k
R2
13k
VOUT
100
95
90
85
80
75
70
65
60
55
50
0.01
0.1
1 10
MP1470 Rev. 1.02
www.MonolithicPower.com
8/27/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP1470 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.9µH, TA = +25°C, unless otherwise noted.
Startup through
Input Voltage
IOUT = 0A
Shutdown through
Input Voltage
IOUT = 0A
Startup through
Input Voltage
IOUT = 2A
VOUT
2V/div.
VIN
10V/div.
VSW
5V/div.
IL
500mA/div.
VOUT
2V/div.
VIN
10V/div.
VSW
5V/div.
IL
200mA/div.
VOUT
2V/div.
VIN
10V/div.
VSW
5V/div.
IL
1A/div.
Shutdown through
Input Voltage
IOUT = 2A
Startup through Enable
IOUT = 0A
Shutdown through Enable
IOUT = 0A
VOUT
2V/VdiIvN.
10V/div.
VSW
5V/div.
IL
1A/div.
VOUT
2V/div.
VEN
2V/div.
VSW
10V/div.
IL
500mA/div.
VOUT
2V/div.
VEN
2V/div.
VSW
10V/div.
IL
500mA/div.
Startup through Enable
IOUT = 2A
Shutdown through Enable
IOUT = 2A
Input/Output Ripple
IOUT = 2A
VOUT
2V/div.
VEN
2V/div.
VSW
10V/div.
VOUT
2V/div.
VEN
2V/div.
VSW
10V/div.
VOUT/AC
50mV/div.
VIN/AC
200mV/div.
VSW
10V/div.
IL
1A/div.
IL
1A/div.
IL
1A/div.
MP1470 Rev. 1.02
www.MonolithicPower.com
8/27/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP1470 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage. The feedback resistor R1 also sets the
feedback-loop bandwidth through the internal
compensation capacitor (see the Typical
Application circuit). Choose R1 around 10kΩ,
and R2with:
R1
R2 =
V
− 1OUT
0.8V
Use a T-type network for when VOUT is low.
RT
FB
R1
VOUT
R2
Figure 6: T-Type Network
Table 1 list s the recommended T-t ype resistors
value for common output voltages.
Table 1: Resistor Selection for Common Output
Voltages
VOUT (V) R1 (kΩ) R2 (kΩ) Rt (kΩ)
1.05 10(1% ) 32.4(1%) 300(1%)
1.2 20.5(1% ) 41.2(1%) 249(1%)
1.8 40.2(1% ) 32.4(1%) 120(1%)
2.5 40.2(1% ) 19.1(1%) 100(1%)
3.3 40.2(1% ) 13(1%) 75(1%)
5 40.2(1%) 7.68(1% ) 75(1% )
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 15mΩ. For most
designs, derive the inductance value from the
following equation.
L1
=
VOUT ×−(VIN VOUT )
VIIN ×Δ L × fOSC
Where ΔIL is the inductor ripple current. Choose
an inductor current ap proximately 30% of th e
maximum lo ad current. The maxi mum inductor
peak current is:
IL(MAX)
= ILOAD
+
ΔIL
2
Under light-load condit ions (below 1 00mA), use
a larger inductor to improve efficiency.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, and therefore requires a
capacitor to both sup ply the AC current to th e
step-down converter an d maintain the DC input
voltage. For the best performance, use low
ESR capacitors, su ch as ceramic capacit ors
with X 5R or X 7R diele ctrics and small
temperature coefficients. A 22µF capacitor is
sufficient for most applications.
The input capacitor (C1 ) requires a n adequate
ripple curre nt rating b ecause it absorbs th e
input swit ching. Estimat e the RMS current in
the input capacitor with:
IC1 = ILOAD ×
VOUT
VIN
×⎜⎛⎜1−
⎝
VOUT
VIN
⎟⎞
⎟
⎠
The worst-case condition occurs at VIN = 2VOUT,
where:
IC1
=
ILOAD
2
For simplification, choose an input capacitor
with an RMS current rat ing greater than half the
maximum load current.
The input capacitor can be electrolytic, tantalum,
or ceramic. Place a small, h igh-quality, ceramic
capacitor (0.1μF) as close to the IC as possible
when using electrolytic or tantalu m capacitors.
When using ceramic capacitors, make sure that
they have enough capacitan ce to provid e
sufficient charge to p revent exc essive inpu t
voltage ripple. Estimate the input vol tage ripple
caused by the capacitance with:
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 electrolytic capa citors. Use low ESR
capacitors t o limit the output voltage ripple.
Estimate the output voltage ripple with:
MP1470 Rev. 1.02
www.MonolithicPower.com
8/27/2013
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 MP1470.PDF ] | |
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