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參數(shù)資料
| 型號： | MIC2205YML |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode |
| 中文描述： | 2 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, MLF-10 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 453K |
| 代理商： | MIC2205YML |
Micrel, Inc.
MIC2205
Applications Information
The MIC2205 is a 600mA PWM power supply that
utilizes a LOWQ light load mode to maximize
battery efficiency in light load conditions. This is
achieved with a LOWQ control pin that when pulled
low, shuts down all the biasing and drive current for
the PWM regulator, drawing only 18
μ
A of operating
current. This allows the output to be regulated
through the LDO output, capable of providing 60mA
of output current. This method has the advantage of
producing a clean, low current, ultra low noise output
in LOWQ mode. During LOWQ mode, the SW
node becomes high impedance, blocking current
flow. Other methods of reducing quiescent current,
such as pulse frequency modulation (PFM) or
bursting techniques, create large amplitude, low
frequency ripple voltages that can be detrimental to
system operation.
When more than 60mA is required, the LOWQ pin
can be forced high, causing the MIC2205 to enter
PWM mode. In this case, the LDO output makes a
"hand-off" to the PWM regulator with virtually no
variation in output voltage. The LDO output then
turns off allowing up to 600mA of current to be
efficiently supplied through the PWM output to the
load.
April 2005
13
M9999-041105
www.micrel.com
Input Capacitor
A minimum 1
μ
F ceramic is recommended on the
VIN pin for bypassing. X5R or X7R dielectrics are
recommended
for
the
dielectrics lose most of their capacitance over
temperature and are therefore, not recommended.
A minimum 1
μ
F is recommended close to the VIN
and PGND pins for high frequency filtering. Smaller
case size capacitors are recommended due to their
lower ESR and ESL. Please refer to layout
recommendations for proper layout of the input
capacitor.
input
capacitor.
Y5V
Output Capacitor
Even though the MIC2205 is optimized for a 2.2
μ
F
output capacitor, output capacitance can be varied
from 1
μ
F to 4.7
μ
F. The MIC2205 utilizes type III
internal compensation and utilizes an internal high
frequency zero to compensate for the double pole
roll off of the LC filter. For this reason, larger output
capacitors can create instabilities. X5R or X7R
dielectrics are recommended for the output
capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore, not
recommended.
In addition to a 2.2
μ
F, a small 10nF is recommended
close to the load for high frequency filtering. Smaller
case size capacitors are recommended due to there
lower ESR and ESL.
Inductor Selection
The MIC2205 is designed for use with a 2.2
μ
H
inductor. Proper selection should ensure the
inductor can handle the maximum average and peak
currents required by the load. Maximum current
ratings of the inductor are generally given in two
methods; permissible DC current and saturation
current. Permissible DC current can be rated either
for a 40°C temperature rise or a 10% to 20% loss in
inductance. Ensure that the inductor selected can
handle the maximum operating current. When
saturation current is specified, make sure that there
is enough margin that the peak current will not
saturate the inductor. Peak inductor current can be
calculated as follows:
L
f
2
V
V
1
V
I
I
IN
OUT
OUT
OUT
PK
×
×
+
=
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| MIC2212-2.6BML | Dual uCap LDO and Power-On Reset |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2205YML TR | 功能描述:直流/直流開關調(diào)節(jié)器 2MHz Synchronous Buck Regulator - low Q Mode (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2205YML-EV | 功能描述:MIC2205 - DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:microchip technology 系列:- 零件狀態(tài):有效 主要用途:DC/DC，步降 輸出和類型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:1.8V 電流 - 輸出:600mA 電壓 - 輸入:2.7 V ~ 5.5 V 穩(wěn)壓器拓撲:降壓 頻率 - 開關:2MHz 板類型:完全填充 所含物品:板 使用的 IC/零件:MIC2205 標準包裝:1 |
| MIC2205YMLTR | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2205YML-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 1V 1 Output 600mA 10-VFDFN Exposed Pad, 10-MLF? 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:2.7V 電壓 - 輸入（最大值）:5.5V 電壓 - 輸出（最小值/固定）:1V 電壓 - 輸出（最大值）:5.5V 電流 - 輸出:600mA 頻率 - 開關:2MHz 同步整流器:是 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤，10-MLF? 供應商器件封裝:10-MLF?（3x3） 標準包裝:1 |
| MIC2206 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LOWQ Mode and Voltage Scaling |
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