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MIC38C42A/43A/44A/45A

DescriptionThe MIC38C4xA are fixed frequency, high performance, current-mode PWM controllers. Micrel's BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements. Undervoltage lockout circuitry of MIC38C4xAallows the '42 and '44 versions to start up at 14.5V and ...

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MIC38C42A/43A/44A/45A: DescriptionThe MIC38C4xA are fixed frequency, high performance, current-mode PWM controllers. Micrel's BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements. ...

MIC38C42A/43A/44A/45A Data Sheet

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MIC38C42A/43A/44A/45A
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Description

The MIC38C4xA are fixed frequency, high performance, current-mode PWM controllers. Micrel's BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements.

Undervoltage lockout circuitry of MIC38C4xA allows the '42 and '44 versions to start up at 14.5V and operate down to 9V, and the '43 and '45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V.

When compared to bipolar 384x devices operating from a 15V supply, start-up current has been reduced to 50µA typical and operating current has been reduced to 4.0mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lower supply voltages. The MIC38C4xA also features a trimmed oscillator discharge current and bandgap reference.

The MIC38C4xA family is available in 8-pin SOIC and MSOP-8 (MM8) package options

For fast rise and fall times and higher output drive, refer to the MIC38HC4x.




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