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MP2158A Folha de dados(PDF) 11 Page - Monolithic Power Systems

Nome de Peças MP2158A
Descrição Electrónicos  1A, 6V, 1.5MHz, 17uA IQ, COT Synchronous Step-Down Converter in Ultra-Small 2x1.5mm QFN-8
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2158A Folha de dados(HTML) 11 Page - Monolithic Power Systems

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MP2158A – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN CONVERTER
MP2158A Rev. 1.02
www.MonolithicPower.com
11
6/30/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see Typical Application on page 1).
The feedback resistor R1 cannot be too large or
too small, considering the trade-off for a
dynamic circuit and stability in the circuit. Set
R1 to around 120kΩ to 200kΩ. R2 is then given
by Equation (2):
out
R1
R2
V
1
0.6
(2)
The feedback circuit is shown in Figure 2.
R1
R2
Vout
FB
MP2158A
Figure 2: Feedback Network
Table 1 lists the recommended resistor values
for common output voltages.
Table 1: Resistor Selection 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
A 0.68µH to 2.2µH inductor is recommended for
most applications. For the highest efficiency,
choose an inductor with a DC resistance of less
than 15mΩ. For most designs, the inductance
value can be derived from Equation (3):
OUT
IN
OUT
1
IN
L
OSC
V(V
V
)
L
VI
f

 
(3)
Where ΔIL is the inductor ripple current.
Set the inductor current to approximately 30%
of the maximum load current. The maximum
inductor peak current is calculated in Equation
(4):
2
I
I
I
L
LOAD
)
MAX
(
L
(4)
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous and requires a capacitor to
supply the 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 values and small
temperature coefficients. For most applications,
a 10µF capacitor is sufficient. For a higher
output voltage, a 22μF capacitor may be
needed to improve system stability.
Since the input capacitor absorbs the input
switching current, it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated with Equation (5):
IN
OUT
IN
OUT
LOAD
1
C
V
V
1
V
V
I
I
(5)
The worse-case condition occurs at VIN = 2VOUT,
shown in Equation (6):
2
I
I
LOAD
1
C
(6)
For simplification, choose an input capacitor
with an RMS current rating greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, use a small, high-quality ceramic
capacitor (0.1Μf) and place it as close to the IC
as possible. When using ceramic capacitors,
make sure that they have enough capacitance
to provide a sufficient charge to prevent an
excessive voltage ripple at the input. The input
voltage ripple caused by capacitance can be
estimated with Equation (7):
LOAD
OUT
OUT
IN
IN
SIN
IV
V
V1
fC1
V
V


 


(7)


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