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MP1601A Datasheet(PDF) 14 Page - Monolithic Power Systems

No. de pieza MP1601A
Descripción Electrónicos  1A Synchronous Step-down Converter with Forced CCM Mode
Download  17 Pages
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Fabricante Electrónico  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1601A Datasheet(HTML) 14 Page - Monolithic Power Systems

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MP1601A – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER IN A SOT563
MP1601A Rev. 1.0
www.MonolithicPower.com
14
9/2/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see the Typical Application on page 14).
Select the feedback resistor (R1) to reduce the
VOUT
leakage current, typically between 100kΩ to
200kΩ. There is no strict requirement on the
feedback resistor. R1 >
10kΩ is reasonable for
the application. R2 can then be calculated with
Equation (2):
out
R1
R2
V
1
0.6
(2)
Figure 2 shows the feedback circuit.
R1
R2
VOUT
FB
MP1601A
Figure 2: Feedback Network
Table 1 lists the recommended resistor values
for common output voltages.
Table 1: Resistor Values for Common Output
Voltages
VOUT (V)
R1 (kΩ)
R2 (kΩ)
1.0
200 (1%)
300 (1%)
1.2
200 (1%)
200 (1%)
1.8
200 (1%)
100 (1%)
2.5
200 (1%)
63.2 (1%)
3.3
200 (1%)
44.2 (1%)
Selecting the Inductor
Most applications work best with a 0.47µH to
2.2µH inductor. Select an inductor with a DC
resistance less than 50
mΩ to optimize efficiency.
High-frequency, switch-mode power supplies
with a magnetic device have strong electronic
magnetic
inference
for
the
system.
Any
unshielded power inductor should be avoided
since it has poor magnetic shielding. Metal alloy
or multiplayer chip power shield inductors are
recommended for the application since they can
decrease influence effectively.
Table 2 lists some recommended inductors.
Table 2: Suggested Inductor List
Manufacturer P/N
Inductance (
μH )
Manufacturer
PIFE25201B-1R0MS
1.0
CYNTEC CO.
LTD.
1239AS-H-1R0M
1.0
Tokyo
74438322010
1.0
Wurth
For most designs, the inductance can be
estimated with Equation (3)
OUT
IN
OUT
1
IN
L
OSC
V
(V
V
)
L
V
I
f

  
(3)
Where
∆IL is the inductor ripple current.
Choose the inductor current to be approximately
30%
of
the
maximum
load
current.
The
maximum
inductor
peak
current
can
be
calculated with Equation (4):
L
L(MAX)
LOAD
I
II
2

(4)
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous and therefore requires a capacitor
to supply AC current to the step-down converter
while maintaining the DC input voltage. Use low
ESR capacitors for the best performance.
Ceramic capacitors with X5R or X7R dielectrics
are highly recommended because of their low
ESR and small temperature coefficients. For
most applications, a 10µF capacitor is sufficient.
Higher output voltages may require a 22
μF
capacitor to increase system stability.
The input capacitor requires an adequate ripple
current rating since it absorbs the input switching
current. Estimate the RMS current in the input
capacitor with Equation (5):
OUT
OUT
C1
LOAD
IN
IN
VV
I
I
1
VV





(5)
The worst-case scenario occurs at VIN = 2VOUT,
shown in Equation (6):
LOAD
C1
I
I
2
(6)


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