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PDF MP2452 Data sheet ( Hoja de datos )
| Número de pieza | MP2452 | |
| Descripción | Step-Down Converter | |
| Fabricantes | MPS | |
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The Future of Analog IC Technology
DESCRIPTION
The MP2452 is a high frequency (1MHz) step-
down switching regulator with integrated
internal high-side high voltage power MOSFET.
It provides up to 1A highly efficient output
current with current mode control for fast loop
response.
The wide 3.3V to 36V input range accommodates
a variety of step-down applications in automotive
input environment. A 3µA shutdown mode
quiescent current allows use in battery-powered
applications.
High power conversion efficiency over a wide
load range is achieved by scaling down the
switching frequency at light load condition to
reduce the switching and gate driving losses.
Frequency fold-back helps prevent inductor current
runaway during start-up. Thermal shutdown
provides reliable, fault-tolerant operation.
The MP2452 is available in the 2mm x 3mm QFN8
package.
MP2452
1A, 36V, 1MHz
Step-Down Converter
FEATURES
• 1A Continuous Load Current
• 130 µA Operating Quiescent Current
• Wide 3.3V to 36V Operating Input Range
• 500 mΩ Internal Power MOSFET
• 1MHz fixed Switching Frequency
• Internally compensated
• Stable with Ceramic Output Capacitors
• Internal Soft-Start
• > 90% Efficiency
• +0.794V FB Reference Voltage
• Output Adjustable from +0.794V to 33V
• 3µA Low Shutdown Supply Current
• 2mm x 3mm QFN8 Package
APPLICATIONS
• High Voltage Power Conversion
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Battery Powered Systems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc..
TYPICAL APPLICATION
C3
10pF
2 BST
SW 3
1 NC MP2452 NC 8
6 GND
VIN 4
7 FB
EN 5
C4
100nF
VIN
o
C1
o
Control
L1
6.8uH
D1
VOUT
5V/1A
o
Efficiency
VOUT=5V
100
95 VIN=8V
90
VIN=12V
85
80
75
70
65 VIN=36V
60 VIN=24V
55
50
10
100 1000
OUTPUT CURRENT(mA)
MP2452 Rev. 1.0
9/27/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
1 page  
MP2452―1A, 36V, 1MHz, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, C1 = 4.7µF, C2 = 10µF, L = 6.8µH and TA = +25°C, unless otherwise noted.
Efficiency
VOUT=2.5V
90
85
80 VIN=6V
75
70 VIN=12V
65 VIN=24V
60
55
50
45
40
10
100 1000
OUTPUT CURRENT(mA)
Efficiency
VOUT=3.3V
90
85 VIN=8V
80 VIN=12V
75
70 VIN=24V
65
60 VIN=36V
55
50
45
40
10
100 1000
OUTPUT CURRENT(mA)
Current Limit vs. Duty Cycle
2
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
0
20 40 60 80
DUTY CYCLE (%)
100
Steady State
VIN=12V,VOUT=5V,IOUT=0.1A
VOUT
(AC coupled)
10mV/div.
VSW
10V/div.
IL
500mA/div.
1us/div
Steady State
VIN=12V,VOUT=5V,IOUT=0.6A
VOUT
(AC coupled)
10mV/div.
Steady State
VIN=12V,VOUT=5V,IOUT=1A
VOUT
(AC coupled)
10mV/div.
SW
10V/div.
IL
500mA/div.
1us/div
VSW
10V/div.
IL
1A/div
1us/div
Startup Through EN
VIN=12V,VOUT=5V,IOUT=0.1A
Startup Through EN
VIN=12V,VOUT=5V,IOUT=0.6A
VOUT
5V/div.
VEN
2V/div.
VSW
10V/div.
IL
500mA/div.
400us/div
VOUT
5V/div.
VEN
2V/div.
VSW
10V/div.
IL
500mA/div.
400us/div
Startup Through EN
VIN=12V,VOUT=5V,IOUT=1A
VOUT
5V/div.
VEN
2V/div.
VSW
10V/div.
IL
1A/div.
400us/div
MP2452 Rev. 1.0
9/27/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
5 Page 
MP2452―1A, 36V, 1MHz, STEP-DOWN CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to FB pin.
The voltage divider divides the output voltage
down to the feedback voltage by the ratio:
VFB
=
VOUT
R2
R1 + R2
Thus the output voltage is:
VOUT
=
VFB
(R1 + R2)
R2
The feedback resistor R1 also sets the
feedback loop bandwidth with the internal
compensation capacitor.
Choose R1 around 124kΩ for optimal transient
response. R2 is then given by:
R2 =
R1
VOUT
0.794V
−1
Table 1―Resistor Selection vs. Output
Voltage Setting
VOUT
0.8V
1.2V
3.3V
5V
R1
124kΩ (1%)
124kΩ (1%)
124kΩ (1%)
124kΩ (1%)
R2
NS
243kΩ (1%)
39.2kΩ (1%)
23.7kΩ (1%)
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. However,
the larger value inductor will have a larger
physical size, higher series resistance, and/or
lower saturation current.
Generally, 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 load
current. Also, make sure that the peak inductor
current is below the maximum switch current
limit. The inductance value can be calculated by:
L1 =
VOUT
fS × ∆IL
× ⎜⎜⎝⎛1 −
VOUT
VIN
⎟⎟⎠⎞
Where VOUT is the output voltage, VIN is the
input voltage, fS is the switching frequency, and
∆IL is the peak-to-peak inductor ripple current.
Choose an inductor that will not saturate under
the maximum inductor peak current. The peak
inductor current can be calculated by:
ILP
=
ILOAD
+
VOUT
2 × fS ×
L1 ×
⎜⎜⎝⎛1 −
VOUT
VIN
⎟⎟⎠⎞
Where ILOAD is the load current.
Table 2 lists a number of suitable inductors
from various manufacturers. The choice of
which style inductor to use mainly depends on
the price vs. size requirements and any EMI
requirement.
MP2452 Rev. 1.0
9/27/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MP2452.PDF ] | |
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