参数资料
型号: MIC2145BMM TR
厂商: Micrel Inc
文件页数: 11/15页
文件大小: 0K
描述: IC REG BST FLYBK SEPIC ADJ 8MSOP
标准包装: 2,500
类型: 升压(升压),回扫,Sepic
输出类型: 可调式
输出数: 1
输出电压: 3 V ~ 16 V
输入电压: 2.4 V ~ 16 V
频率 - 开关: 450kHz
电流 - 输出: 500mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-MSOP
其它名称: MIC2145BMMTR
MIC2145BMMTR-ND
MIC2145
Diode
A Schottky diode should be used for the output diode. Most
of the application circuits on this data sheet specify the
Motorola MBR0530 surface mount Schottky diode. It has a
forward current of 0.5A and a low forward voltage drop. For
applications that are cost driven, the 1N4148 or equivalent
can be used but the efficiency will suffer due to higher forward
voltage drop.
Output Capacitor
Low ESR capacitors should be used at the output of the
MIC2145 to minimize the switching output ripple voltage.
Selection of the capacitor value will depend upon the peak
inductor current, inductor size, and the load. MuRata offers
the GRM43-2 series with up to 10 μ F at 25V, with a X5R
temperature coefficient in a 1812 surface-mount package.
For lower output voltage applications, the GRM42-2 (1210
package/10 μ F/16V) and GRM42-6 (1206 package/10 μ F/
6.3V) series can be used. Typically, values ranging from
10 μ F to 47 μ F can be used for the output capacitor.
Micrel, Inc.
Reducing Peak Current
If lower than 400mA peak current is required then the soft
start pin may be shorted to ground. This changes the refer-
ence of the current limit comparator. With the soft start pin
shorted to ground, the maximum current will approximately
reduce to half. The peak current should always be set at least
50% higher than the maximum load current.
April 2005
11
M9999-042205
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