MP2106DQ MPS [Monolithic Power Systems], MP2106DQ Datasheet - Page 9

• Manufacturer Part Number: MP2106DQ
• Description: 1.5A, 15V, 800KHz Synchronous Buck Converter
• Manufacturer: MPS [Monolithic Power Systems]

Choose the compensation resistor to set the
desired crossover frequency. Determine the
value by the following equation:
Where f
(preferably 33KHz).
Choose the compensation capacitor to set the
zero below one fourth of the crossover
frequency. Determine the value by the following
equation:
Determine
capacitor, C4 is required. It is required if the
ESR zero of the output capacitor happens at
less than half of the switching frequency. Or:
If this is the case, then add the second
compensation capacitor.
Determine the value by the equation:
Where R
output capacitor.
MP2106 Rev. 1.6
2/22/2006
C
ESR(MAX)
is the desired crossover frequency
R
TM
if
π
3
C
×
=
4
C
C
the
2
is the maximum ESR of the
3
2
=
G
π
×
>
C
×
EA
R
2
π
C
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
ESR
×
×
2
×
second
R
G
R
×
R
2
ESR
3
CS
×
V
3
OUT
×
f
SW
(max)
×
f
C
V
×
FB
>
MP2106 – 1.5A, 15V, 800KHz SYNCHRONOUS BUCK CONVERTER
f
1
C
compensation
© 2006 MPS. All Rights Reserved.
www.MonolithicPower.com
External Boost Diode
For input voltages less than or equal to 5V, it is
recommended that an external boost diode be
added. This will help improve the regulator
efficiency. The diode can be a low cost diode
such as an IN4148 or BAT54.
This diode is also recommended for high duty
cycle operation (when
output
However, do not exceed the absolute maximum
voltage for these pins.
Figure 3—External Boost Diode
voltage
MP2106
BST
(V
LX
OUT
8
6
V
>12V)
V
OUT
IN
5V
MP2106_F03
>65%) and high
BOOST
DIODE
10nF
applications.
9