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MP2482DS Datasheet(PDF) 10 Page - Monolithic Power Systems

Part # MP2482DS
Description  5A, 30V, 420kHz Step-Down Converter
Download  14 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2482DS Datasheet(HTML) 10 Page - Monolithic Power Systems

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MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER
MP2482 Rev.1.4
www.MonolithicPower.com
10
9/21/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change
© 2011 MPS. All Rights Reserved.
APPLICATION INFORMATION
The schematic on the front page shows a typical
MP2482 application. The IC can provide up to 5A
output current at a nominal output voltage of 3.3V.
For proper thermal performance, the exposed pad
of the device must be soldered down to the
printed circuit board.
Setting the Output Voltage
The external resistor divider is used to set the
output voltage (see the schematic on front page).
The feedback resistor R1 also sets the feedback
loop bandwidth with the internal compensation
capacitor (see Figure 1). Choose R1 to be
around 40.2kΩ for optimal transient response. R2
is then given by:
1
V
8
.
0
V
1
R
2
R
OUT
=
Table 1—Resistor Selection for Common
Output Voltages
VOUT (V)
R1 (kΩ)
R2 (kΩ)
1.8
40.2 (1%)
32.4 (1%)
2.5
40.2 (1%)
19.1 (1%)
3.3
40.2 (1%)
13 (1%)
5
40.2 (1%)
7.68 (1%)
Selecting the Inductor
A 1µH to 10µH inductor with a DC current rating
of at least 25% percent higher than the maximum
load
current
is
recommended
for
most
applications. For highest efficiency, the inductor
DC resistance should be less than 15mΩ. For
most designs, the inductance value can be
derived from the following equation.
OSC
L
IN
OUT
IN
OUT
f
I
V
)
V
V
(
V
L
×
Δ
×
×
=
Where ΔIL is the inductor ripple current.
Choose inductor current to be approximately
30% of the maximum load current, 5A. The
maximum inductor peak current is:
2
I
I
I
L
LOAD
)
MAX
(
L
Δ
+
=
Under light load conditions below 100mA, larger
inductance is recommended for improved efficiency.
Output Rectifier Diode
The output rectifier diode supplies the current to
the inductor when the high-side switch is off. To
reduce losses due to the diode forward 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 rating is greater than the
maximum load current. Table 2 lists example
Schottky diodes and manufacturers.
Table 2—Diode Selection Guide
Diode
Voltage/Current
Rating
Manufacture
B530C
30V, 5A
Diodes Inc.
MBRD630CT
30V, 6A
On Semi
Selecting the Input Capacitor
The input capacitor (C1) reduces the surge
current drawn from the input and the switching
noise from the device. The input capacitor
impedance at the switching frequency should be
less than the input source impedance to prevent
high frequency switching current from passing to
the input. Ceramic capacitors with X5R or X7R
dielectrics are highly recommended because of
their low ESR and small temperature coefficients.
For 5A output applications, a 22µF capacitor is
sufficient.
Selecting the Output Capacitor
The output capacitor (C2) keeps output voltage
small and ensures regulation loop stability. The
output capacitor impedance should be low at the
switching frequency. Ceramic capacitors with
X5R or X7R dielectrics are recommended.


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