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 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 RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller datasheet (Rev. J) | PDF | HTML | 03 Nov 2014 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Transient Response versus Ripple – An Analysis of Ripple Injection Techniques | 28 Apr 2014 | ||
| Application note | Automated Frequency Response Analyzer | 09 Oct 2013 | ||
| EVM User's guide | AN-1905 LM25085 Evaluation Board (Rev. B) | 26 Apr 2013 | ||
| Application note | Constant Current Constant Voltage Buck Converter w/LM25085 (Rev. A) | 23 Apr 2013 |
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The LM25085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM25085 PFET switching controller which uses the constant on-time (COT) operating principle. The evaluation board provides a 5V output over an input range of 5.5V to 42V. The circuit (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HVSSOP (DGN) | 8 | Ultra Librarian |
| VSSOP (DGK) | 8 | Ultra Librarian |
| WSON (NGQ) | 8 | Ultra Librarian |
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