参数资料
型号: AS3658D-BCTP
厂商: ams
文件页数: 71/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description-Power Management Functions
8.11.2 Step Down DC/DC Converter Characteristics
Figure 27. Step Down DC/DC Converter Block diagram
 
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Functional Description
The step-down converter is a high efficiency fixed frequency current mode regulator. By using low resistance internal
PMOS and NMOS switches efficiency up to 95% can be achieved. The fast switching frequency allows using small
inductors, without increasing the current ripple. The unique feedback and regulation circuit guarantees optimum load
and line regulation over the whole output voltage range, up to an output current of 500mA, with an output capacitor of
only 10μF. The implemented current limitation protects the DCDC and the coil during overload condition.
To allow optimized performance in different applications, there are bit settings possible, to get the best compromise
between high efficiency and low input, output ripple:
Low ripple, low noise operation:
Bit settings:
sdX_dis_curmin=1
In this mode there is no minimum coil current necessary before switching off the PMOS. As result, the ON time of the
PMOS will be reduced down to tmin_on at no or light load conditions, even if the coil current is very small or the coil
current is inverted. This results in a very low ripple and noise, but decreased efficiency, at light loads, especially at low
input to output voltage differences. Because of the inverted coil current in that case the regulator will not operate in
pulse skip mode.
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