Datasheet Texas Instruments LM25085QMYX/NOPB — Datenblatt

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SNVS593J – OCTOBER 2008 – REVISED NOVEMBER 2014 LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller
1 Features 3 Description The LM25085 is a high efficiency PFET switching
regulator controller that 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
4.5V to 42V input range. The constant on-time
regulation principle requires no loop compensation,
simplifies circuit implementation, and results in ultrafast 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 RDS(ON) of the PFET or an external
sense resistor can be used to sense current for overcurrent detection. 1 LM25085-Q1 is an Automotive Grade product that
is AEC-Q100 Grade 1 Qualified (-40В°C to 125В°C …