LM25085MME

TEXAS INSTRUMENTS  LM25085MME  控制器, PFET, 恒定通导时间, 4.5V至42V, 1路输出, 降压, 1MHz, MSOP-8

The is a constant on-time non-synchronous PFET Buck Controller, can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5 to 42V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation and results in ultra-fast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDSON of the PFET or an external sense resistor can be used to sense current for over-current detection.

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No loop compensation required

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Fast transient response

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Nearly constant operating frequency with line and load variations

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±2% Feedback reference

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Internal soft-start timer

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Integrated high voltage bias regulator

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Thermal shutdown

This device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.