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MP2145 数据表(PDF) 17 Page - Monolithic Power Systems

部件名 MP2145
功能描述  5.5V, 6A, 1.2MHz, High-Efficiency, 40uA IQ Constant On-Time Synchronous, Step-Down Switcher
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制造商  MPS [Monolithic Power Systems]
网页  http://www.monolithicpower.com
标志 MPS - Monolithic Power Systems

MP2145 数据表(HTML) 17 Page - Monolithic Power Systems

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MP2145
– 5.5V, 6A, 1.2MHz, COT, BUCK SWITCHER
MP2145 Rev. 1.11
www.MonolithicPower.com
17
12/20/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
Selecting the Output Capacitor
The output capacitor stabilizes the DC output
voltage. Ceramic capacitors are recommended.
Low ESR capacitors are preferred to limit the
output voltage ripple. Estimate the output
voltage ripple as:
OUT
OUT
OUT
ESR
S
1
IN
S
VV
1
V
1
R
f
L
V
8 f
C2


 


 
 
Where L1 is the inductor value and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
When
using
ceramic
capacitors,
the
capacitance dominates the impedance at the
switching frequency, and causes most of the
output voltage ripple. For simplification, the
output voltage ripple can be estimated as:
OUT
OUT
OUT
2
S
1
IN
VV
ΔV1
8 f
L
C2
V

 

 

For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be approximated as:
OUT
OUT
OUT
ESR
IN
S1
VV
ΔV
1
R
f
L
V

 


The characteristics of the output capacitor also
affect the stability of the regulation system. For
MP2145, 2pcs 22uF Co can satisfy the most
application. Add Co can reduce DCM and CCM
output ripple effectively. However, a very large
Co may cause light group pulse in sleep mode.
Load Transient Optimization
MP2145 can add a capacitor (Cc) between
ramp pin and output sense pin to improve load
transient. The larger Cc value is, the faster load
transient respond speed is. A typical Cc 22pF
trades off load transient and loop stability,
maximum Cc is less than 200pF in case of SW
instability issue. Further, MP2145 internally has
optimized compensate block to cover most
application. Ramp pin can be floated in normal
application.
PCB Layout Recommendation
Proper layout of the switching power supplies is
very important, and sometimes critical to make
it
work
properly.
Especially, for the high
switching converter, if the layout is not carefully
done, the regulator could show poor line or load
regulation, stability issues.
For
MP2145,
the
high
speed
step-down
regulator, the input capacitor should be placed
as close as possible to the IC pins. As shown in
Figure 7, the 0805 size ceramic capacitor is
used, please make sure the two ends of the
ceramic capacitor be directly connected to PIN
8 (the Power Input Pin) and PIN 10/11/12 (the
Power GND Pin).
1
4
10
9
3
7
6
12
SW
OUT
RAMP
FB
VIN
SW
VIN
PG
EN MODE/
VCON
GNDGNDGND
5
2
8
11
Cin
Cout
R1
R2
GND
Pin10,11,12
(PGND)
Pin8
(VIN)
Lout
Figure 7: Two ends of Input decoupling
Capacitor close to Pin 8 and Pin 10/11/12


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