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MP2234S Datenblatt(PDF) 14 Page - Monolithic Power Systems

Teilenummer MP2234S
Bauteilbeschribung  High-Efficiency, 2A, 16V, 800kHz Synchronous, Step-Down Converter
Download  19 Pages
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Hersteller  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2234S Datenblatt(HTML) 14 Page - Monolithic Power Systems

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MP2234S – SYNCHRONOUS STEP-DOWN CONVERTER
MP2234S Rev.1.0
www.MonolithicPower.com
14
4/3/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see Typical Application on page 1).
Choose R1 around 40kΩ for VOUT>1.2V, R2 is
then given by:
OUT
R1
R2
V
1
0.804V
=
The T-Type network is recommended highly
(see Figure 7)
Figure 7. T-Type Network
Table 1 lists the recommended resistors and
compensation values for common output
voltages.
Table 1: Resistor Selection for Common Output
Voltages
(8)
VOUT
(V)
R1 (kΩ) R2 (kΩ) Rt (kΩ)
1
20.5
84.5
34
1.2
30.1
61.9
24
1.8
40.2
32.4
15
2.5
40.2
19.1
6.8
3.3
40.2
13
5.6
5
40.2
7.68
2
Notes:
8) The recommended parameters are based on a 800kHz
switching frequency; a different input voltage, output-inductor
value, and output-capacitor value may affect the selection of
R1, R2, and Rt. For additional component parameters, please
refer to the “Typical Application Circuits” section on pages 17
and 18.
Selecting the Inductor
Use a 1µH-to-22µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current for most applications.
For highest efficiency, use 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
×−
=
×Δ ×
Where ΔIL is the inductor ripple current.
Choose the inductor ripple current to be
approximately 30% of the maximum load
current. The maximum inductor peak current is:
2
I
I
I
L
LOAD
)
MAX
(
L
Δ
+
=
Use a larger inductor for improved efficiency
under light-load conditions—below 100mA.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore requires a capacitor is
to supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low ESR capacitors for the best
performance. Use ceramic capacitors with X5R
or X7R dielectrics for best results because of
their
low
ESR
and
small
temperature
coefficients. For most applications, use a 22µF
capacitor.
Since C1 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 worst case condition occurs at VIN = 2VOUT,
where:
2
I
I
LOAD
1
C =
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, add a small, high quality ceramic
capacitor (e.g. 0.1μF) placed as close to the IC
as possible. When using ceramic capacitors,
make sure that they have enough capacitance
to
provide
sufficient
charge
to
prevent
excessive voltage ripple at input. The input


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