参数资料
型号: MIC5159-3.0BM6 TR
厂商: Micrel Inc
文件页数: 9/23页
文件大小: 471K
描述: IC REG CTRLR SGL 3V SOT23-6
标准包装: 3,000
类型: 正,固定式
输出数: 1
输出电压: 3V
电流 - 电源: 10mA
输入电压: 1.65 V ~ 5.5 V
工作温度: -40°C ~ 125°C
封装/外壳: SOT-23-6
供应商设备封装: SOT-23-6
包装: 带卷 (TR)
其它名称: MIC5159-3.0BM6TR
MIC5159-3.0BM6TR-ND
Micrel, Inc.
MIC5159
 
 
June 2006 
9
M9999-062706
 
 
Input Capacitor
An input capacitor of 1.0礔 or greater is recommended
when the device is more than 4 inches away from the
bulk AC supply capacitance or when the supply is a
battery. Small, surface mount, ceramic capacitors can be
used for bypassing the input to the regulator, further
improving the integrity of the output voltage. Larger input
capacitors   may   be   required   depending   on   the
impedance   of   the   source   and   the   output   load
requirements.
Layout Considerations
Input and output capacitor placement should be as close
as possible to the input and output, respectively. Trace
resistance between the current sense and the MOSFET
source should be minimized. Trace resistance will
increase dropout voltage. This is more of a factor at
higher output currents.
Also, a minimum amount of distance between the gate
pin, on the MIC5159, and the P-Channel MOSFET gate
is recommended. A long trace can create a small
parasitic inductor. This, coupled to the gate capacitance
of the MOSFET, can create a high frequency tank circuit.
A small 50& resistor in series with the gate may be
required to eliminate high-frequency noise.
Adjustable Regulator Design
The MIC5159 allows programming the output voltage
anywhere between 1.235V to V
IN
. Two resistors are
used. See Figure 4. The resistor values are calculated
by:
 
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?/DIV>
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?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>

?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
1
1.235
V
R2
R1
OUT
 
Where V
OUT
 is the desired output voltage.
 
V
IN
R
S
R1
R2
V
OUT
C
OUT
= 10礔
ceramic
Si3445
IS
ADJ
IN
EN
GND
GATE
MIC5159-x.x
 
Figure 4. Adjustable Regulator Design
 
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