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MP2307 데이터시트 PDF




MPS에서 제조한 전자 부품 MP2307은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 MP2307 기능
기능 340KHz Synchronous Rectified Step-Down Converter
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MP2307 데이터시트, 핀배열, 회로
The Future of Analog IC Technology
MP2307
3A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
DESCRIPTION
The MP2307 is a monolithic synchronous buck
regulator. The device integrates 100m
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.
This device, available in an 8-pin SOIC
package, provides a very compact system
solution with minimal reliance on external
components.
EVALUATION BOARD REFERENCE
Board Number
EV2307DN-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
FEATURES
3A Continuous Output Current
4A Peak Output Current
Wide 4.75V to 23V Operating Input Range
Integrated 100mPower 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
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/Appliances
Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
C5
10nF
21
7
IN
EN
BS
SW
3
8 SS
MP2307
FB 5
GND
COMP
46
C3
3.9nF
OUTPUT
3.3V
3A
MP2307_TAC01
Efficiency vs
Load Current
100
95
90 VIN = 12V
VIN = 5V
85
80 VIN = 23V
75
70
65
60
55
50
0.1
1.0
LOAD CURRENT (A)
10
MP2307_EC01
MP2307 Rev. 1.9
5/28/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
1




MP2307 pdf, 반도체, 판매, 대치품
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
C1 = 2 x 10µF, C2 = 2 x 22µF, L= 10µH, CSS= 0.1µF, TA = +25°C, unless otherwise noted.
Steady State Test
Waveforms
VIN = 12V, VOUT = 3.3V, IOUT = 0A
Steady State Test
Waveforms
VIN = 12V, VOUT = 3.3V, IOUT = 3A
Startup through
Enable Waveforms
VIN = 12V, VOUT = 3.3V, No Load
VIN
20mV/div.
VOUT
20mV/div.
VSW
10V/div.
IL
1A/div.
VIN
200mV/div.
VOUT
20MV/div.
VSW
V/div.
IL
2A/div.
MP2307-TPC01
VEN
5V/div.
VOUT
2V/div.
IL
1A/div.
VSW
10V/div.
MP2307-TPC02
2ms/div.
MP2307-TPC03
Startup Through
Enable Waveforms
VIN = 12V, VOUT = 3.3V,
IOUT = 3A (Resistance Load)
VEN
5V/div.
VOUT
2V/div.
IL
2A/div.
VSW
10V/div.
2ms/div.
MP2307-TP04
Shutdown Through
Enable Waveforms
VIN = 12V, VOUT = 3.3V, No Load
VEN
5V/div.
VOUT
2V/div.
IL
1A/div.
VSW
10V/div.
2ms/div.
MP2307-TPC05
Shutdown Through
Enable Waveforms
VIN = 12V, VOUT = 3.3V,
IOUT = 3A (Resistance Load)
VEN
5V/div.
VOUT
2V/div.
IL
2A/div.
VSW
10V/div.
MP2307-TPC06
Load Transient Test
Waveforms
VIN = 12V, VOUT = 3.3V,
IOUT = 1A to 2A step
VOUT
200mV/div.
IL
1A/div.
ILOAD
1A/div.
Short Circuit Test
Waveforms
VIN = 12V, VOUT = 3.3V
VOUT
2V/div.
IL
2A/div.
Short Circuit Recovery
Waveforms
VIN = 12V, VOUT = 3.3V
VOUT
2V/div.
IL
2A/div.
MP2307 Rev. 1.9
5/28/2008
MP2307 -TPC07
MP2307-TPC08
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
MP2307-TPC09
4

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MP2307 전자부품, 판매, 대치품
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
APPLICATIONS INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive
voltage divider connected from the output
voltage to FB. 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
=
0.925
×
R1 + R2
R2
R2 can be as high as 100k, but a typical value
is 10k. Using the typical value for R2, R1 is
determined by:
R1 = 10.81× (VOUT 0.925) (k)
For example, for a 3.3V output voltage, R2 is
10k, and R1 is 26.1k. Table 1 lists
recommended resistance values of R1 and R2
for standard output voltages.
Table 1—Recommended Resistance Values
VOUT
1.8V
2.5V
3.3V
5V
12V
R1
9.53k
16.9k
26.1k
44.2k
121k
R2
10k
10k
10k
10k
10k
Inductor
The inductor is required to supply constant
current to the load while being driven by the
switched input voltage. A larger value inductor
will result in less ripple current that will in turn
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. A good rule for
determining inductance is to allow the peak-to-
peak ripple current to be approximately 30% of
the maximum switch current limit. Also, make
sure that the peak inductor current is below the
maximum switch current limit.
The inductance value can be calculated by:
L
=
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, calculated
by:
ILP
= ILOAD
+
VOUT
2 × fS × L
× ⎜⎜⎝⎛1
VOUT
VIN
⎟⎟⎠⎞
Where ILOAD is the load current.
The choice of which style inductor to use mainly
depends on the price vs. size requirements and
any EMI constraints.
Optional Schottky Diode
During the transition between the high-side
switch and low-side switch, the body diode of
the low-side power MOSFET conducts the
inductor current. The forward voltage of this
body diode is high. An optional Schottky diode
may be paralleled between the SW pin and
GND pin to improve overall efficiency. Table 2
lists example Schottky diodes and their
Manufacturers.
Table 2—Diode Selection Guide
Part Number
B130
SK13
MBRS130
Voltage/Current
Rating
30V, 1A
30V, 1A
30V, 1A
Vendor
Diodes, Inc.
Diodes, Inc.
International
Rectifier
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the AC current while maintaining the
DC input voltage. Use low ESR capacitors for
the best performance. Ceramic capacitors are
preferred, but tantalum or low-ESR electrolytic
capacitors will also suffice. Choose X5R or
X7R dielectrics when using ceramic capacitors.
MP2307 Rev. 1.9
5/28/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
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