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參數(shù)資料
| 型號(hào)： | MIC3385YML |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)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(shù)： | 11/15頁 |
| 文件大?。?/td> | 684K |
| 代理商： | MIC3385YML |
Micrel, Inc.
MIC3385
Application Information
November 2006
11
M9999-111006-A
The MIC3385 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 18μA 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 MIC3385 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.
Input Capacitor
A minimum 1μF ceramic is recommended on the VIN pin
for bypassing. X5R or X7R dielectrics are recommended
for the input capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore, not
recommended.
A minimum 1μF 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.
Output Capacitor
The MIC3385 is optimized for a 10μF output capacitor. A
larger value can be used to improve transient response
The MIC3385 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 10μF, 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.
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