參數(shù)資料
型號： MIC2205
廠商： Micrel Semiconductor,Inc.
英文描述： 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode
中文描述： 2MHz的PWM同步降壓穩(wěn)壓器與LDO的待機模式
文件頁數(shù)： 1/16頁
文件大?。?/td> 453K
代理商： MIC2205
MIC2205
2MHz PWM Synchronous Buck
Regulator with LDO Standby Mode
General Description
The Micrel MIC2205 is a high efficiency 2MHz PWM
synchronous
buck (step-down) regulator
features a
LOWQ
LDO standby mode that draws
only 18
μ
A of quiescent current. The MIC2205
allows an ultra-low noise, small size, and high
efficiency solution for portable power applications.
In PWM mode, the MIC2205 operates with a
constant frequency 2MHz PWM control. Under light
load conditions, such as in system sleep or standby
modes, the PWM switching operation can be
disabled to reduce switching losses. In this light
load
LOWQ
mode, the LDO maintains the output
voltage and draws only 18
μ
A of quiescent current.
The LDO mode of operation saves battery life while
not introducing spurious noise and high ripple as
experienced with pulse skipping or bursting mode
regulators.
The MIC2205 operates from 2.7V to 5.5V input and
features internal power MOSFETs that can supply
up to 600mA output current in PWM mode. It can
operate with a maximum duty cycle of 100% for use
in low-dropout conditions.
The MIC2205 is available in the 3mm x 3mm MLF-
10L package with a junction operating range from
–40
°
C to +125
°
C.
Data sheets and support documentation can be
found on Micrel’s web site at www.micrel.com.
____________________________________________________________________________________________________
Typical Application
Patent Pending
LOWQ
is a trademark of Micrel, Inc
Micrel, Inc 2180 Fortune Drive San Jose, Ca 95131 USA tel +1 (408) 944-0800 fax +1 (408) 474-1000 http://www.micrel.com
April 2005
M9999-041105
www.micrel.com
that
Features
2.7 to 5.5V supply voltage
Light load
LOWQ
LDO mode
18
μ
A quiescent current
Low noise, 75
μ
Vrms
2MHz PWM mode
Output current to 600mA
>95% efficiency
100% maximum duty cycle
Adjustable output voltage option down to 1V
Fixed output voltage options available
Ultra-fast transient response
Stable with 1
μ
F ceramic output capacitor
Fully integrated MOSFET switches
Micropower shutdown
Thermal shutdown and current limit protection
Pb-free 3mm x 3mm MLF-10L package
–40
°
C to +125
°
C junction temperature range
Applications
Cellular phones
PDAs
USB peripherals
V
OUT
MIC2205
GND
V
IN
2.7V to 5.5V
GND
VIN
AVIN
SW
LDO
LOWQ
EN
FB
PGND
10
BIAS
AGND
1
C4
2.2μF
C3
100pF
R1
100k
R2
125k
C1
1μF
C2
0.1μF
2.2μH
LowQ
8
4
6
7
3
5
2
9
Adjustable Output Buck Regulator with
LOWQ
Mode
50
55
60
65
70
75
80
85
90
95
100
0
100 200 300 400 500 600
OUTPUT CURRENT (mA)
E
1.8V
OUT
Efficiency
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3V
相關(guān)PDF資料
PDF描述
MIC2205YML 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MIC2205_06 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode
MIC2205-1.38YML 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode
MIC2205-1.38YML TR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2MHz Synchronous Buck Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MIC2205-1.3YML 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2MHz PWM Synchronous Buck Regulator with LDO Standby Mode
MIC2205-1.3YML TR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2MHz Synchronous Buck Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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