|
|
PDF MP4566 Data sheet ( Hoja de datos )
| Número de pieza | MP4566 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MP4566 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
MP4566
Step-Down
The Future of Analog IC Technology
36V, 1MHz, 0.6A
Converter
With 35μA Quiescent Current
DESCRIPTION
The MP456 6 is a high frequency (1 MHz) step-
down switching regu lator with integrate d
internal high-side high voltage powe r MOSFET.
It provides single 0.6A (or less) hig hly efficient
output with current mode control fo r fast loop
response.
The wide 4.5V t
o 36V i nput range
accommodates a variety of step-down
applications in automotive input e nvironment.
The very low shutdown mode quiescent current
allows use in battery-powered applications.
High power conversion efficiency over a wide
load range is a chieved by scalin g down the
switching fr equency at light load condition to
reduce the switching and gate driving losses.
Frequency fold-back h elps prevent inductor
current ru naway during start-u p. Thermal
shutdown provides reliable,
fault-toler ant
operation.
The MP4566 is available in a 2mmx3mm QFN8
package.
FEATURES
• 35 μA Quiescent Current
• Low Shutdown Mode Current: <2μA
• Wide 4.5V to 36V Operating Input Range
• 450m Ω Internal Power MOSFET
• Fixed 1MHz Switching Frequency
• Internally compensated
• Stable with Ceramic Output Capacitors
• Internal Soft-Start
• Precision Current Limit Without Current
Sensing Resistor
• High Light Load Efficie ncy up to 77% at
1mA
• +1.0V FB Reference Voltage
• Output Adjustable from +1.0V to 0.8xVIN
• 2mmx3 mm QFN8 Package
APPLICATIONS
• Adapter-Based/Handheld Applications
• Notebook/Netbook PCs
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Battery Powered Systems
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
4.5V to 36V
OFF ON
C3
2
BST SW 3
4 VIN
C1
D1
L1
MP4566
R3
5 EN
BIAS 1
C4
R1
GND FB 7
6 R2
C5
39pF
VOUT
3.3V/0.6A
C2
Efficiency vs. Load Current
VOUT=3.3V
100
90
80
70
60 VIN=12V VIN=6V
50 VIN=24V
40
30 VIN=36V
20
0. 0001 0.001 0.01 0.1
LOAD CURRENT (A)
1
MP4566 Rev. 1.01
9/22/2011
ww.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP4566―36V, 1MHz, 0.6A, STEP-DOWN CONVERTER WITH 35μA QUIESCENT CURRENT
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=12V, VOUT=3.3V, L=3.3μH, COUT=22μF, unless otherwise noted.
Efficiency vs. Load Current
VOUT=3.3V
100
Quiescent Current vs.
Input Voltage
EN=2V, VFB=1.1V
60
90
80
70
60 VIN=12V VIN=6V
50 VIN=24V
40
30 VIN=36V
20
0.0001 0.001 0.01 0.1
LOAD CURRENT (A)
1
50
40
30
20
10
0
0
10 20 30
INPUT VOLTAGE (V)
40
Shutdown Current vs.
Input Voltage
EN=0V
5
4. 5
4
3. 5
3
2.5
2
1.5
1
0.5
0
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Load Regulation @
0.5 VOUT=3.3V
0 .4
0 .3 VIN=6V
0 .2
0 .1 VIN=12V
0
-0 .1 VIN=24V
-0 .2
-0 .3
VIN=36V
-0 .4
-0 .5
0.0001 0.001 0.01 0.1
LOAD CURRENT (A)
1
Line Regulation
0 .2
0 .1 5
0 .1
0 .0 5
0
-0 .0 5
-0 .1
-0 .1 5
-0 .2
0
IOUT=0.25A
IOUT=0.5A
IOUT=1A IOUT=0A
5 10 15 20 25 30 35 40
LINE VOLTAGE (V)
Case Temp. vs.
Load Current
14
12
10
8
6
4
2
0
0 0.2 0.4 0.6 0.8
LOAD CURRENT (A)
1
MP4566 Rev. 1.01
9/22/2011
ww.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
5 Page 
MP4566―36V, 1MHz, 0.6A, STEP-DOWN CONVERTER WITH 35μA QUIESCENT CURRENT
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider from output voltage
to FB pin is used to set the output voltage. The
feedback resistor R1 also sets the feedback loop
bandwidth with the internal compensation
capacitor. Choose R1 to be around 150~200kΩ.
R2 is then given by:
R2
=
R1
Vout
1.0
−1
Table 1 lists the re commended T -type resist ors
value for common output voltages.
Table 1—Resistor Selection for Common
Output Voltages
VOUT (V)
R1 (kΩ) R2 (kΩ)
1.8 150(1%)
187(1%)
2.5 150(1%)
100(1%)
3.3 187(1%)
80.6(1%)
Selecting the 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 with the same
output capacitors. However, the larger value
inductor will have a larger physical size, higher
series resistance, and/or lower saturation current
as well as the slow load transient dynamic. 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. The inductance
value can be calculated by:
L1
=
VOUT ×−(VIN VOUT )
VIIN ×Δ L × fOSC
Where V IN is th e in put voltage, f osc i s the
switching frequency and ΔIL is the inductor ripple
current.
Choose an inductor tha t will not sa turate under
the maxi mum inductor peak curren t. The peak
inductor current can be calculated by:
IL(MAX)
= ILOAD
+
ΔIL
2
where ILOAD is the load current.
Selecting the Output Rectifier Diode
The output rectifier dio de supplie s t he current to
the inductor when the high-side switch is off. T o
reduce lo sses due to t he diode fo rward voltage
and recovery times, use a Schottky diode.
Choose a diode whose maximum reverse voltage
rating is greater than the maximum input voltage,
and whose current rat ing is grea ter than th e
maximum load current. Table 2 lists example
Schottky diodes and manufacturers.
Table 2—Output Schottky Diodes
Manufacturer Part Number
Diodes Inc.
Diodes Inc.
Central semi
Central semi
B240-13-F
B340-13-F
CMSH2-40M
CMSH3-40MA
Voltage
Rating
(V)
40V
40V
40V
40V
Current
Rating
(A)
2A
3A
2A
3A
Package
SMA
SMA
SMA
SMA
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter
while maintaining the DC input volt age. Use lo w
ESR capacitors for the best performance.
Ceramic capacitors wit h X 5R or X7R dielectrics
are highly recommende d because of their low
ESR and small temperature coefficients. Fo r
most applications, a 10 µF capacito r is sufficien t.
For higher output voltage, 22uF may be need ed
for more stable system.
Since the input capacitor absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
IC1 = ILOAD ×
VOUT
VIN
×⎜⎛⎜1−
⎝
VOUT
VIN
⎟⎞
⎟
⎠
The worse case con dition o ccurs at VIN
2VOUT, where:
=
IC1
=
ILOAD
2
MP4566 Rev. 1.01
9/22/2011
ww.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MP4566.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MP4561 | Step-Down Converter | MPS |
| MP4566 | Step-Down Converter | MPS |
| MP4568 | Step-Down Converter | MPS |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |