Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

MP2147 Fiches technique(PDF) 14 Page - Monolithic Power Systems

No de pièce MP2147
Description  5.5V, 4A, 1.2MHz, High-Efficiency, 40uA IQ Constant On-Time Synchronous, Step-Down Switcher
Download  19 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  MPS [Monolithic Power Systems]
Site Internet  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2147 Fiches technique(HTML) 14 Page - Monolithic Power Systems

Back Button MP2147 Datasheet HTML 10Page - Monolithic Power Systems MP2147 Datasheet HTML 11Page - Monolithic Power Systems MP2147 Datasheet HTML 12Page - Monolithic Power Systems MP2147 Datasheet HTML 13Page - Monolithic Power Systems MP2147 Datasheet HTML 14Page - Monolithic Power Systems MP2147 Datasheet HTML 15Page - Monolithic Power Systems MP2147 Datasheet HTML 16Page - Monolithic Power Systems MP2147 Datasheet HTML 17Page - Monolithic Power Systems MP2147 Datasheet HTML 18Page - Monolithic Power Systems Next Button
Zoom Inzoom in Zoom Outzoom out
 14 / 19 page
background image
MP2147 – 5.5V, 4A, 1.2MHz, COT, BUCK SWITCHER
MP2147 Rev. 1.1
www.MonolithicPower.com
14
6/8/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
Considering the internal circuit propagation time,
the typical delay is 50ns. It means the inductor
current still fall after the ZCD is trigger in this
delay. If the inductor current falling slew rate is
fast (Vo voltage is high or close to Vin), the low
side MOSFET is turned off and inductor current
may be negative. This phenomena will cause
MP2147 can not enter DCM operation. If the
DCM mode is required, the off time of low side
MOSFET in CCM should be longer than 100ns.
For example, Vin is 3.6V and Vo is 3.3V, the off
time in CCM is 70ns. It is difficult to enter DCM
at light load. And using smaller inductor can
improve it and make it enter DCM easily.
Enable
When the input voltage exceeds the under-
voltage lockout (UVLO) threshold—typically
2.55V—the MP2147 can be enabled by pulling
the EN pin above 1.6V. Leaving EN pin floating
or grounded will disable the MP2147. There is
an internal 1MΩ resistor from the EN pin to
ground.
Mode
Selection
and
Analog
Voltage
Dynamic Regulation
MP2147 has programmable PWM and PFM
work mode. When MODE/VCON is more than
1.2V, MP2147 enters PWM mode. When
MODE/VCON is lower than 0.4V or floating,
MP2147 enters PFM mode. PFM mode can
achieve high efficiency by light-load operation.
PWM
mode
can
keep
constant
switch
frequency and smaller Vo ripple, but it has low
efficiency at light load.
VCON (V)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.5 0.6 0.7 0.8 0.9
1
1.1 1.2
Figure 5: Reference Voltage change with VCON
MP2147 can dynamic regulate output voltage
by MODE/VCON pin to meet some situation
need change output voltage directly. When
MOED/VCON pin get an appropriate voltage
value (from 0.6V to 1.1V), MP2147 will work
with PWM mode and internal reference voltage
changes smoothly to achieve a new output
voltage without changing external resistor
divider. When VCON function is enabled, set
Ref voltage from 0.35V to 0.6V, the accuracy is
3% typically. When set Ref voltage from 0.1V to
0.35V, the accuracy is 10% typically. Detail Ref
voltage calculation formula such as below:
Ref(V)=0.985 VCON(V)-0.486
Soft-Start
The MP2147 has a built-in soft-start that ramps
up the output voltage at a constant slew rate
that avoids overshooting at startup. The soft-
start time is typically about 1.5ms.
Pre-Bias Startup
The MP2147 can start up with a pre-bias output
voltage. If the internal SS voltage is lower than
the FB voltage, the HS-FET and LS-FET
remain off until the SS voltage crosses the FB
voltage.
Power-Good Indicator
The MP2147 has an open drain with a 500kΩ
pull-up resistor as a power-good (PG) indication.
When the FB voltage exceeds 90% of the
regulation voltage (0.6V), the PG pin is pulled
up to VIN by the internal resistor. Otherwise the
PG pin is pulled to ground by an internal
MOSFET. The MOSFET has a maximum Rdson
of less than 100Ω.
Current Limit
The MP2147 has a 6A min current limit for the
HS-FET. When the HS-FET hits its current limit,
the MP2147 enters hiccup mode until the
current drops to prevent the inductor current
from
rising
and
possibly
damaging
the
components.
Short Circuit and Recovery
The MP2147 enters short-circuit protection
(SCP) mode when it hits the current limit, and
tries to recover from the short circuit by entering
hiccup mode. In SCP, the MP2147 disables the
output power stage, discharges a soft-start
capacitor,
and
then
enacts
a
soft-start


Numéro de pièce similaire - MP2147

FabricantNo de pièceFiches techniqueDescription
logo
Monolithic Power System...
MP2147GD MPS-MP2147GD Datasheet
496Kb / 8P
   5.5V, 4A, 1.2MHz, High-Efficiency, 40uA IQ Constant On-Time Synchronous, Step-Down Switcher Evaluation Board
More results

Description similaire - MP2147

FabricantNo de pièceFiches techniqueDescription
logo
Monolithic Power System...
EV2147-D-00A MPS-EV2147-D-00A Datasheet
496Kb / 8P
   5.5V, 4A, 1.2MHz, High-Efficiency, 40uA IQ Constant On-Time Synchronous, Step-Down Switcher Evaluation Board
MP2145 MPS-MP2145 Datasheet
1Mb / 19P
   5.5V, 6A, 1.2MHz, High-Efficiency, 40uA IQ Constant On-Time Synchronous, Step-Down Switcher
EV2145-D-00A MPS-EV2145-D-00A Datasheet
552Kb / 8P
   5.5V, 6A, 1.2MHz, High-Efficiency, 40uA IQ Constant On-Time Synchronous, Step-Down Switcher Evaluation Board
MP9143 MPS-MP9143 Datasheet
483Kb / 15P
   3A, 5.5V, 1.2MHz, 40uA IQ, COT Synchronous Step Down Switcher
MP2143 MPS-MP2143 Datasheet
478Kb / 14P
   3A, 5.5V, 1.2MHz, 40uA 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
EV2131-G-00A MPS-EV2131-G-00A Datasheet
490Kb / 6P
   4A, 5.5V, 1.2MHz Synchronous Step-Down Switcher Evaluation Board
MP2144 MPS-MP2144 Datasheet
363Kb / 14P
   2A, 5.5V, 1.2MHz, 40A IQ, COT Synchronous Step Down Switcher
MP2321 MPS-MP2321 Datasheet
4Mb / 24P
   19V, 2A, 40uA IQ, High-Efficiency, Constant-On-Time, Step-Down Converter in a QFN (2mmx3mm) Package
MP2316 MPS-MP2316 Datasheet
1Mb / 25P
   19V, 3A, 40uA IQ, High-Efficiency Constant On-Time (COT) Step-Down Converter in 2x3mm QFN Package
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
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