参数资料
型号: MIC4721YMM
厂商: Micrel Inc
文件页数: 14/19页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 10MSOP
标准包装: 100
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1V
输入电压: 2.7 V ~ 5.5 V
频率 - 开关: 2MHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
供应商设备封装: 10-MSOP
产品目录页面: 1093 (CN2011-ZH PDF)
其它名称: 576-1655-5
MIC4721YMM-ND
Micrel, Inc.
5V IN and 1.8V OUT at 1.5A load;
MIC4721
The graph above shows the effects on the gain and
phase of the system caused by feedback resistors and a
?
?
Phase Margin = 43.1 Degrees
GBW = 218KHz
feedforward capacitor. The maximum amount of phase
boost achievable with a feedforward capacitor is
graphed below.
The non-synchronous MIC4721 regulator only has the
ability to source current. This means that the regulator
must rely on the load to sink current. This causes a non-
linear response at light loads. The following plot shows
the effects of the pole created by the nonlinearity of the
output drive during light load (discontinuous) conditions.
By looking at the graph, phase margin can be affected to
a greater degree with higher output voltages. The next
bode plot shows the phase margin of a 1.8V output at
1.5A without a feedforward capacitor.
3.3V IN and 1.8V OUT I OUT = 50mA;
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Phase Margin = 90.5 Degrees
GBW = 64.4KHz
Feed Forward Capacitor
The feedback resistors are a gain reduction block in the
overall system response of the regulator. By placing a
capacitor from the output to the feedback pin, high
frequency signal can bypass the resistor divider, causing
a gain increase up to unity gain.
May 2007
14
M9999-052907-A
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