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MP2143 Folha de dados(PDF) 12 Page - Monolithic Power Systems

Nome de Peças MP2143
Descrição Electrónicos  3A, 5.5V, 1.2MHz, 40uA IQ, COT Synchronous Step Down Switcher
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2143 Folha de dados(HTML) 12 Page - Monolithic Power Systems

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MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
MP2143 Rev. 1.07
www.MonolithicPower.com
12
7/4/2016
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 the Typical Application schematic
on page 1). The feedback resistor R1 must
account for both stability and dynamic response,
and thus can not be too large or too small.
Choose an R1 value between 120kΩ and
200kΩ. R2 is then given by:
out
R1
R2
V
1
0.6
The feedback circuit is shown as Figure 2.
R1
R2
Vout
FB
MP2143
Figure 2: Feedback Network
Table 1 lists the recommended resistors 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
A 0.82µH to 4.7µH inductor is recommended for
most applications. For highest efficiency, chose
an inductor with a DC resistance less than
15mΩ. For most designs, the inductance value
can be derived from the following equation.
OUT
IN
OUT
1
IN
L
OSC
V(V
V
)
L
VI
f

 
Where ΔIL is the inductor ripple current.
Choose an inductor current to be approximately
30% of the maximum load current. The
maximum inductor peak current is:
L
L(MAX)
LOAD
I
II
2

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 higher output voltage, use 47μF 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 by:
IN
OUT
IN
OUT
LOAD
1
C
V
V
1
V
V
I
I
The worse case condition occurs at VIN =
2VOUT, where:
2
I
I
LOAD
1
C
For simplification, choose an input capacitor
whose 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), placed as close to the IC as
possible. When using ceramic capacitors, make
sure that they have enough capacitance to
prevent excessive voltage ripple at input. The
input voltage ripple caused by capacitance can
be estimated by:
LOAD
OUT
OUT
IN
IN
SIN
IV
V
V1
fC1
V
V


 




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