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參數資料
| 型號： | MIC3385YML |
| 廠商： | MICREL INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 8MHz Power System Module with LDO Standby Mode |
| 中文描述： | 2 A SWITCHING REGULATOR, 8800 kHz SWITCHING FREQ-MAX, DSO14 |
| 封裝： | 3 X 3.50 MM, LEAD FREE, MLF-14 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 684K |
| 代理商： | MIC3385YML |
MIC3385
8MHz Power System Module with LDO
Standby Mode
Preliminary Information
General Description
Patent Pending
LOWQ
is a trademark of Micrel, Inc.
MLF and
Micro
LeadFrame are registered trademarks of Amkor Technology, 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
November 2006
1
M9999-111006-A
The Micrel MIC3385 is a high efficiency Power System on
a Chip that features a
LOWQ
LDO standby mode that
draws only 18μA of quiescent current. The MIC3385
requires no external inductor enabling an ultra-low noise,
small size, and high efficiency solution for portable power
applications.
In PWM mode, the MIC3385 operates with a constant
frequency 8MHz 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 18μA 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 MIC3385 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 MIC3385 is available in the 14-pin 3mm x 3.5mm
MLF
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.
Features
2.7 to 5.5V supply voltage
Light load
LOWQ
LDO mode
–
18
μ
A quiescent current
–
Low noise, 75μVrms
8MHz PWM mode
–
Output current to 600mA
–
>90% efficiency
–
100% maximum duty cycle
Adjustable output voltage option down to 1V
Ultra-fast transient response
NO
external inductor required
Enables sub 1mm profile solution
Fully integrated MOSFET switches
Micropower shutdown
Thermal shutdown and current limit protection
Pb-free 14-pin 3mm x 3.5mm MLF
package
–40
°
C to +125
°
C junction temperature range
Applications
Cellular phones
PDAs
USB peripherals
Typical Application
Adjustable Output Buck Regulator with
LOWQ
Mode
0
10
20
30
40
50
60
70
80
90
100
OUTPUT CURRENT (mA)
1.8V
OUT
Efficiency
0
100
200
300
400
500
V
IN
=3.2V
V
IN
=3.6V
V
IN
=4.2V
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