データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

MP2188 データシート(PDF) 11 Page - Monolithic Power Systems

部品番号 MP2188
部品情報  Dual 3A, 5.5V, 1.2MHz, COT Synchronous Step Down Switchers With Auto Output Discharge
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  MPS [Monolithic Power Systems]
ホームページ  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2188 データシート(HTML) 11 Page - Monolithic Power Systems

Back Button MP2188 Datasheet HTML 7Page - Monolithic Power Systems MP2188 Datasheet HTML 8Page - Monolithic Power Systems MP2188 Datasheet HTML 9Page - Monolithic Power Systems MP2188 Datasheet HTML 10Page - Monolithic Power Systems MP2188 Datasheet HTML 11Page - Monolithic Power Systems MP2188 Datasheet HTML 12Page - Monolithic Power Systems MP2188 Datasheet HTML 13Page - Monolithic Power Systems MP2188 Datasheet HTML 14Page - Monolithic Power Systems MP2188 Datasheet HTML 15Page - Monolithic Power Systems Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 17 page
background image
MP2188 – DUAL 3A, 5.5V, 1.2MHz, SYNCHRONOUS STEP-DOWN SWITCHER
MP2188 Rev. 1.01
www.MonolithicPower.com
11
2/2/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
OPERATION
The MP2188 uses constant on-time control with
input voltage feed-forward to stabilize the
switching frequency over its full input range. At
light load, the MP2188 employs proprietary
control over the low-side MOSFET (LS-FET)
and inductor current to eliminate ringing on
switching node and improve efficiency. The
output voltages are fixed. The output voltages
of two channels are 1.1V and 1.8V respectively.
Constant-On–Time Control
When compared to fixed-frequency PWM control,
constant-on–time
control
offers
advantages
including simpler control loop and faster transient
response. By using input voltage feed-forward,
the MP2188 maintains a nearly constant
switching frequency across the entire input and
output voltage range.
The on-time of the
switching pulse can be estimated as:
OUT
ON
IN
V
t0.833 s
V
=⋅
μ
To prevent inductor current runaway during the
load transient, the MP2188 has a fixed minimum
off time of 50ns. However, this minimum off time
limit does not affect the operation of the MP2188
in steady state in any way.
Light-Load Operation
Under light-load conditions, the MP2188 uses a
proprietary control scheme to save power and
improve efficiency: it gradually ramps down the
LS-FET current to its minimum instead of
turning off the LS-FET immediately when the
inductor current starts to reverse. The gradual
current drop avoids ringing at the switching
node that always occurs in discontinuous
conduction mode (DCM) operation.
There is a zero current cross detect circuit
(ZCD) to judge if the inductor current starts to
reverse. When the inductor current touch ZCD
threshold, the low side switch will start to be
turned off.
The DCM mode happens only after low side
switch turned off by ZCD circuit. Considering
the ZCD circuit propagation time, the typical
delay is 30ns. It means the inductor current still
fall after the ZCD is trigger during this delay. If
the inductor current falling slew rate is fast
(Output voltage is high or close to input
Voltage), the low side MOSFET is turned off at
the moment inductor current may be negative.
This phenomena will cause MP2188 cannot
enter DCM operation. If the DCM mode is
required, the off time of low side MOSFET in
CCM should be longer than 60ns. It means the
maximum duty is 92% to guarantee DCM mode
at light load. For example, Vin is 3.4V and Vo is
3.3V, the off time in CCM is 24.5ns. 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
2.2V—the MP2188 can be enabled by pulling
the EN pin higher than 1.2V. Leaving EN pin
floating or grounded will disable the MP2188.
There is an internal 1MΩ resistor from the EN
pin to ground.
Soft-Start/Stop
MP2188 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 1.3ms. When disabled,
the MP2188 ramps down the internal reference
voltage to allow the load to linearly discharge
the output.
Power GOOD Indictor
MP2188 has an open drain with a 500kΩ pull-
up resistor pin for power good (PG) indication.
When the FB pin is within ±10% of the
regulatory voltage (0.6V), the PG pin is pulled
up to VIN by the internal resistor. If the FB pin
voltage is outside the ±10% window, the PG pin
is pulled to ground by an internal MOSFET. The
MOSFET has a maximum Rdson of less than
100Ω.
Current limit
The MP2188 has a 5.3A minimum current limit
for the high side switch (HS-FET). When the
HS-FET hits its current limit, MP2188 enters


同様の部品番号 - MP2188

メーカー部品番号データシート部品情報
logo
Monolithic Power System...
MP2188GQA MPS-MP2188GQA Datasheet
481Kb / 9P
   Dual 3A, 5.5V, 1.2MHz Synchronous Step-Down Swithers With Auto Output Discharge Evaluation Board
More results

同様の説明 - MP2188

メーカー部品番号データシート部品情報
logo
Monolithic Power System...
MP2187 MPS-MP2187 Datasheet
440Kb / 18P
   Dual 3A, 5.5V, 1.2MHz, COT Synchronous Step-Down Switcher
EV2188-QA-00A MPS-EV2188-QA-00A Datasheet
481Kb / 9P
   Dual 3A, 5.5V, 1.2MHz Synchronous Step-Down Swithers With Auto Output Discharge Evaluation Board
EV2187-QA-01A MPS-EV2187-QA-01A Datasheet
443Kb / 9P
   Dual 3A, 5.5V, 1.2MHz Synchronous Step-Down Swithers With Auto Output Discharge 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
MP2144 MPS-MP2144 Datasheet
363Kb / 14P
   2A, 5.5V, 1.2MHz, 40A IQ, COT Synchronous Step Down Switcher
logo
Richtek Technology Corp...
RT7257B RICHTEK-RT7257B Datasheet
284Kb / 14P
   3A, 18V, 1.2MHz Synchronous Step-Down Converter
RT7297B RICHTEK-RT7297B Datasheet
278Kb / 14P
   3A, 18V, 1.2MHz Synchronous Step-Down Converter
RT8253B RICHTEK-RT8253B Datasheet
205Kb / 15P
   3A, 23V, 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


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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