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MP1497S Arkusz danych(PDF) 12 Page - Monolithic Power Systems

Numer części MP1497S
Szczegółowy opis  High-Efficiency, 3A, 16V, 500kHz Synchronous, Step-Down Converter
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Producent  MPS [Monolithic Power Systems]
Strona internetowa  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1497S Arkusz danych(HTML) 12 Page - Monolithic Power Systems

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MP1497S – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP1497S Rev. 1.01
www.MonolithicPower.com
12
9/7/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
voltage ripple low. The output voltage ripple can
be estimated by:
OUT
OUT
OUT
ESR
S1
IN
S
VV
1
V1
R
fL
V
8 f
C2



 


 
 
Where L1 is the inductor value and RESR is the
equivalent series resistance of the output
capacitor.
For
ceramic
capacitors,
the
capacitance
dominates the impedance at the switching
frequency. The capacitance also causes the
majority of the output voltage ripple. For
simplification, estimate the output voltage ripple
with:
OUT
OUT
OUT
2
IN
S1
VV
ΔV1
V
8f
L
C2

 

 

For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be approximated to:
OUT
OUT
OUT
ESR
IN
S1
VV
ΔV1
R
fL
V

 


The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP1497S can be optimized for a wide range of
capacitance and ESR values.
External Bootstrap Diode
An external bootstrap diode can enhance the
efficiency of the regulator, given the following
conditions:
VOUT is 5V or 3.3V; and
Duty cycle is high: D=
IN
OUT
V
V
>65%
In these cases, connect an external BST diode
from the VCC pin to BST pin, as shown in
Figure 5.
SW
BST
MP1497S
C
L
BST
COUT
External BST Diode
VCC
IN4148
Figure 5: Optional External Bootstrap Diode to
Enhance Efficiency
The recommended external BST diode is
IN4148, and the BST capacitor is 0.1µF to 1μF.
PC Board Layout (9)
PCB layout is very important to achieve stable
operation especially for VCC capacitor and
input capacitor placement. For best results,
follow these guidelines:
1) Use large ground plane directly connect to
GND pin. Add vias near the GND pin if bottom
layer is ground plane.
2) Place the VCC capacitor to VCC pin and
GND pin as close as possible. Make the trace
length of VCC pin-VCC capacitor anode-VCC
capacitor cathode-chip GND pin as short as
possible.
3) Place the ceramic input capacitor close to IN
and GND pins. Keep the connection of input
capacitor and IN pin as short and wide as
possible.
4) Route SW, BST away from sensitive analog
areas such as FB. It’s not recommended to
route SW, BST trace under chip’s bottom side.
5) Place the T-type feedback resistor R9 close
to chip to ensure the trace which connects to
FB pin as short as possible
Notes:
9) The recommended layout is based on the Figure 6 Typical
Application circuit on the next page.


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