Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

MP2187 Folha de dados(PDF) 15 Page - Monolithic Power Systems

Nome de Peças MP2187
Descrição Electrónicos  Dual 3A, 5.5V, 1.2MHz, COT Synchronous Step-Down Switcher
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2187 Folha de dados(HTML) 15 Page - Monolithic Power Systems

Back Button MP2187 Datasheet HTML 10Page - Monolithic Power Systems MP2187 Datasheet HTML 11Page - Monolithic Power Systems MP2187 Datasheet HTML 12Page - Monolithic Power Systems MP2187 Datasheet HTML 13Page - Monolithic Power Systems MP2187 Datasheet HTML 14Page - Monolithic Power Systems MP2187 Datasheet HTML 15Page - Monolithic Power Systems MP2187 Datasheet HTML 16Page - Monolithic Power Systems MP2187 Datasheet HTML 17Page - Monolithic Power Systems MP2187 Datasheet HTML 18Page - Monolithic Power Systems  
Zoom Inzoom in Zoom Outzoom out
 15 / 18 page
background image
MP2187 – DUAL 3A, 5.5V, 1.2MHz, SYNCHRONOUS STEP-DOWN SWITCHER
MP2187 Rev. 1.0
www.MonolithicPower.com
15
12/12/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
Since the input capacitor absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
×
×
=
IN
OUT
IN
OUT
LOAD
1
C
V
V
1
V
V
I
I
The worse case condition occurs at VIN =
2VOUT, where:
2
I
I
LOAD
1
C =
For simplification, choose an input capacitor
whose 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, use a small high-quality ceramic
capacitor (0.1μF), placed as close to the IC as
possible. When using ceramic capacitors, make
sure that they have enough capacitance to
prevent excessive voltage ripple at input. The
input voltage ripple caused by capacitance can
be estimated by:
LOAD
OUT
OUT
IN
IN
SIN
IV
V
V1
fC1
V
V
⎛⎞
Δ=
×
× −
⎜⎟
×
⎝⎠
Selecting the Output Capacitor
The output capacitor (C2) maintains the output
DC voltage. Use ceramic capacitors. Low-ESR
capacitors keep the output 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
⎛⎞
⎛⎞
Δ=
× −
×
+
⎜⎟
⎜⎟
×× ×
⎝⎠ ⎝⎠
Where L1 is the inductor value and RESR is the
equivalent series resistance of the output
capacitor.
Using ceramic capacitors, the impedance at the
switching frequency is dominated by the
capacitance. The output voltage ripple is mainly
caused by the capacitance. For simplification,
the output voltage ripple can be estimated by:
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 as:
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.
PCB Recommendation of MP2187
Proper layout of the switching power supplies is
very important, and sometimes critical for
proper operation. For high-frequency switching
converters, poor layout could lead to poor line
or load regulation and stability issues.
The high current paths (GND, IN, and SW)
should be placed very close to the device using
short, direct, and wide traces. The input
capacitor needs to be as close as possible to
the IN and GND pins. The external feedback
resistors should be placed next to the FB pin.
Keep the switching node SW short and away
from the feedback network.
For MP2187 PCB layout, there are two
recommended layouts for selecting. Figure 2
(refer to schematic figure 4) shows symmetric
PCB layout. If the layout is space limited, and
has to be asymmetric, a ferrite bead (The
Impedance
should
>220mΩ@100MHz)
is
suggested to separate the two input of each
channel. Figure 3 (refer to schematic figure 5)
shows asymmetric PCB layout.
Figure 2: Symmetric PCB Layout


Nº de peça semelhante - MP2187

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Monolithic Power System...
MP2187GQA MPS-MP2187GQA Datasheet
443Kb / 9P
   Dual 3A, 5.5V, 1.2MHz Synchronous Step-Down Swithers With Auto Output Discharge Evaluation Board
More results

Descrição semelhante - MP2187

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Monolithic Power System...
MP2143 MPS-MP2143 Datasheet
478Kb / 14P
   3A, 5.5V, 1.2MHz, 40uA IQ, COT Synchronous Step Down Switcher
MP9143 MPS-MP9143 Datasheet
483Kb / 15P
   3A, 5.5V, 1.2MHz, 40uA IQ, COT Synchronous Step Down Switcher
MP2144 MPS-MP2144 Datasheet
363Kb / 14P
   2A, 5.5V, 1.2MHz, 40A IQ, COT Synchronous Step Down Switcher
MPQ2143-AEC1 MPS-MPQ2143-AEC1 Datasheet
802Kb / 15P
   3A, 5.5V, 1.2MHz, 40uA IQ, COT Synchronous Step-Down Switcher AEC-Q100 Qualified
MP2188 MPS-MP2188 Datasheet
1Mb / 17P
   Dual 3A, 5.5V, 1.2MHz, COT Synchronous Step Down Switchers With Auto Output Discharge
MPQ2143H MPS-MPQ2143H Datasheet
897Kb / 15P
   3A, 5.5V, 2.0MHz Synchronous Step Down Switcher
MP2143H MPS-MP2143H Datasheet
527Kb / 15P
   3A, 5.5V, 2.0MHz Synchronous Step Down Switcher
EV2131-G-00A MPS-EV2131-G-00A Datasheet
490Kb / 6P
   4A, 5.5V, 1.2MHz Synchronous Step-Down Switcher Evaluation Board
EV2143H-D-00A MPS-EV2143H-D-00A Datasheet
483Kb / 7P
   3A, 5.5V, 2MHz Synchronous Step-Down Switcher Evaluation Board
logo
Richtek Technology Corp...
RT7257B RICHTEK-RT7257B Datasheet
284Kb / 14P
   3A, 18V, 1.2MHz Synchronous Step-Down Converter
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com