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MP2166 Datasheet(PDF) 16 Page - Monolithic Power Systems

Part # MP2166
Description  6V, Dual 2A/2A or 3A/1A, Low Quiescent Current, Synchronous Buck with PG and SS
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2166 Datasheet(HTML) 16 Page - Monolithic Power Systems

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MP2166
– 6V, DUAL 2A/2A OR 3A/1A, SYNC, BUCK REGULATOR WITH PG AND SS
MP2166 Rev. 1.0
www.MonolithicPower.com
16
3/14/2017
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage. The feedback resistor (R1) also sets
the feedback loop bandwidth with the internal
compensation (see Figure 5).
FB
VOUT
R1
R2
Figure 5: External Resistor Divider
In the case of ceramic capacitors used as
output capacitors (CO), the feedback loop
bandwidth (fC) is no higher than 1/10 of the
switching
frequency
for
optimal
transient
performance and good phase margin. If an
electrolytic
capacitor
is
used,
the
loop
bandwidth is no higher than 1/4 of the ESR zero
frequency (fESR). fESR can be calculated by
Equation (2):
ESR
ESR
O
1
f
2
R
C
 
(2)
For example, choose fC = 80kHz with a ceramic
capacitor and CO = 22μF.
R1 is estimated to be 10
0kΩ. R2 can then be
calculated with Equation (3):
OUT
R1
R2
V
1
0.6V
(3)
Use Table 1 to select resistor values based on
different output voltages.
Table 1: Resistor Selection vs. Output Voltage
Setting
VOUT
R1
R2
1.2V
100k
Ω
100k
Ω
1.5V
100k
Ω
66.5k
Ω
1.8V
100k
Ω
49.9k
Ω
2.5V
100k
Ω
31.6k
Ω
3.3V
100k
Ω
22.1k
Ω
Inductor Selection
An inductor with a DC current rating at least
25% higher than the maximum load current is
recommended for most applications. For best
efficiency, the inductor DC resistance should be
less
than
20mΩ. For most designs, the
inductance value can be derived from Equation
(4):
SW
L
IN
OUT
IN
OUT
f
I
V
)
V
-
(V
V
L
(4)
Where
∆IL is inductor ripple current. Choose the
inductor ripple current to be approximately 30%
of the maximum load current.
The maximum inductor peak current can be
calculated with Equation (5):
L
L(MAX)
LOAD
ΔI
I
= I
+
2
(5)
Input Capacitor Selection
The input capacitor reduces the surge current
drawn from the input and the switching noise
from the device. The input capacitor impedance
at the switching frequency should be less than
the input source impedance to prevent high-
frequency switching current from passing to the
input source. Ceramic capacitors with X5R or
X7R
dielectrics
are
highly
recommended
because
of
their
low
ESR
and
small
temperature coefficients. For most applications,
a 22µF capacitor is sufficient.
Output Capacitor Selection
The output capacitor (CO) keeps the output
voltage ripple small and ensures a stable
regulation
loop.
The
output
capacitor
impedance should be low at the switching
frequency. Use ceramic capacitors with X5R or
X7R dielectrics. If an electrolytic capacitor is
used, pay close attention to the output ripple
voltage, extra heating, and the selection of the
upper feedback resistor due to the large ESR of
electrolytic capacitor (refer to the Setting the
Output Voltage section). The output ripple
(
∆V
OUT) can be approximated with Equation (6):
)
8
1
(
Co
f
ESR
f
L
V
)
V
-
(V
V
V
SW
SW
IN
OUT
IN
OUT
OUT
(6)


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