參數(shù)資料
型號(hào): MIC2206
廠商: Micrel Semiconductor,Inc.
英文描述: 2MHz PWM Synchronous Buck Regulator with LOWQ Mode and Voltage Scaling
中文描述: 2MHz的PWM同步降壓穩(wěn)壓器具有LOWQ模式和電壓縮放
文件頁(yè)數(shù): 1/12頁(yè)
文件大?。?/td> 608K
代理商: MIC2206
MIC2206
2MHz PWM Synchronous Buck
Regulator with LOWQ Mode and Voltage
Scaling
General Description
The Micrel MIC2206 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 MIC2206
allows an ultra-low noise, small size, and high
efficiency solution for portable power applications.
In PWM mode, the MIC2206 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 an output
voltage of 1V 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 MIC2206 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 MIC2206 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
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
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
Output Voltage Scaling (1V output in LOWQ
Mode)
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
1.8V/600mA
V
IN
Li Ion
Battery
MIC2206
VIN
AVIN
LDO
SW
LOWQ
EN
FB
PGND
BIAS
AGND
C
2.2μF
Ceramic
100pF
C
IN
4.7μF
0.1μF
2.2μH
Fixed Output Buck Regulator with
LOWQ
Mode
M9999-041905
www.micrel@micrel.com
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