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MP1601A Arkusz danych(PDF) 15 Page - Monolithic Power Systems

Numer części MP1601A
Szczegółowy opis  1A Synchronous Step-down Converter with Forced CCM Mode
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Producent  MPS [Monolithic Power Systems]
Strona internetowa  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1601A Arkusz danych(HTML) 15 Page - Monolithic Power Systems

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MP1601A – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER IN A SOT563
MP1601A Rev. 1.0
www.MonolithicPower.com
15
9/2/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
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,
0.1μF,
ceramic capacitor as close to the IC as possible.
When using ceramic capacitors, ensure that they
have enough capacitance to provide a sufficient
charge to prevent excessive voltage ripple at the
input. The input voltage ripple caused by
capacitance can be estimated with Equation (7):
LOAD
OUT
OUT
IN
IN
S
IN
I
V
V
V1
f
C1
V
V

 


(7)
Selecting the Output Capacitor
The output capacitor (C2) stabilizes the DC
output voltage. Low ESR ceramic capacitors are
recommended to limit the output voltage ripple.
Estimate the output voltage ripple with Equation
(8):
OUT
OUT
OUT
ESR
S
1
IN
S
VV
1
V
1
R
f
L
V
8 f
C2


 


 
 
(8)
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 with Equation (9):
OUT
OUT
OUT
2
S
1
IN
VV
ΔV1
8 f
L
C2
V

 

 

(9)
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be approximated with Equation (10):
OUT
OUT
OUT
ESR
IN
S1
VV
ΔV
1
R
f
L
V

 


(10)
The characteristics of the output capacitor also
affect the stability of the regulation system.
PCB Layout Guidelines
Efficient layout of the switching power supplies is
critical for stable operation. For the high-
frequency switching converter, poor layout
design can result in poor line or load regulation
and stability issues. For best results, refer to
Figure 3 and follow the guidelines below.
1. Place the high-current paths (GND, VIN and
SW) as close to the device as possible with
short, direct, and wide traces.
2. Place the input capacitor as close to VIN and
GND as possible.
3. Place the external feedback resistors next to
FB.
4. Keep the switching node (SW) short and
away from the feedback network.
5. Keep the VOUT sense line as short as possible
or away the from power inductor and
surrounding inductors.
LOUT
G
N
D
COUT
GND
R2
VIN
VOUT
EN
CIN
1
2
3
4
5
6
VIN
EN
OUT
FB
GND
SW
R1
Figure 3: Two Ends of Input Decoupling
Capacitor Close to Pin 2 and Pin 3


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