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MP9148GJ Datasheet(PDF) 11 Page - Monolithic Power Systems

Part No. MP9148GJ
Description  6V, 1A, Low Quiescent Current Dual, SYNC Buck Regulator
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
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MP9148GJ Datasheet(HTML) 11 Page - Monolithic Power Systems

 
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MP9148 – 6V, 1A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR
MP9148 Rev.1.0
www.MonolithicPower.com
11
11/10/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
APPLICATION INFORMATION
COMPONENT SELECTION
Output Voltage
External resistor dividers connected to the FB
pins set the output voltages. The feedback
resistor connected to FB1 (R1) also sets the
feedback loop bandwidth (fC).
fC does not exceed 0.1×fSW. When using a
ceramic output capacitor (CO), set the range to
50kHz
and
100kHz
for
optimal
transient
performance and good phase margin. When
using an electrolytic capacitor, set the loop
bandwidth no higher than 1/4 the ESR zero
frequency (fESR). fESR is:
ESR
ESR
O
1
f
2π RC
=
⋅⋅
We suggest using a 600k to 800k resistor for R1
when CO=22μF. R2 is then:
OUT
R1
R2
V
1
0.608V
=
Table 1: Resistor Values vs. Output Voltage
VOUT
R1
R2
L
COUT
(Ceramic)
1.2V
806kΩ
825kΩ
0.47μH-2.2μH
22μF
1.5V
806kΩ
549kΩ
0.47μH-2.2μH
22μF
1.8V
806kΩ
412kΩ
0.47μH-2.2μH
22μF
2.5V
806kΩ
261kΩ
1μH-4.7μH
22μF
3.3V
806kΩ
182kΩ
1μH-4.7μH
22μF
Inductor Selection
Use a 0.47µH-to-2.2µH inductor with a DC
current rating of at least 1.25 times the maximum
load current for most applications. For best
efficiency, select an inductor with a DC
resistance
<20mΩ.
See
Table
2
for
recommended inductors. For most designs,
estimate the inductance value using the following
equation:
OUT
IN
OUT
IN
L
OSC
V(V
V
)
L
V
ΔIf
=
⋅⋅
Where ∆IL is the inductor ripple current. Select an
inductor ripple current equal to approximately
30% of the maximum load current, 1A.
The maximum inductor peak current is:
L
L(MAX)
LOAD
ΔI
I= I
+
2
Table 2: Suggested Surface-Mount Inductors
Vendor
Part
Number
L
(μH)
DCR
(mΩ)
SC
(A)
L x W x H
(mm
3)
WURTH
744777002
2.2
13
6
7.3×7.3×4.5
744310200
2
14.2
6.5
7×6.9×3
TDK
RLF7030T-
1R5N6R1-T
1.5
8
6.5
7.8×6.8×3.2
Input Capacitor
The input capacitor reduces the surge current
drawn from the input and the switching noise
from the device. Select an input capacitor with a
switching-frequency impedance that is less than
the input source impedance to prevent high-
frequency-switching current from passing to the
input source. Use low-ESR ceramic capacitors
with
X5R
or
X7R
dielectrics
with
small
temperature coefficients. For most applications, a
22µF capacitor is sufficient.
Output Capacitor
The output capacitor limits the output voltage
ripple and ensures a stable regulation loop.
Select an output capacitor with low impedance at
the switching frequency. Use ceramic capacitors
with X5R or X7R dielectrics. Using an electrolytic
capacitor may result in additional output voltage
ripple, thermal issues, and requires additional
care in selecting the feedback resistor (R1) due
to the large ESR. The output ripple (∆VOUT) is
approximately:
OUT
IN
OUT
OUT
IN
OSC
OSC
O
V(V
V
)
1
ΔVESR
Vf
L
8 f
C
⎛⎞
=⋅
+
⎜⎟
⋅⋅
⋅⋅
⎝⎠
Power Dissipation
IC power dissipation plays an important role in
circuit design—not only because of efficiency
concerns, but also because of the chip’s thermal
requirements.
Several
parameters
influence
power dissipation, such as:
• Conduction Loss (Cond)
• Dead Time (DT)


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