LM25085 Datasheet PDF – PFET Buck Switching Controller

Part Number: LM25085

Function: 42V Constant On-Time PFET Buck Switching Controller

Package: VSSOP, WSON, HVSSOP 8 Pin Type

Manufacturer: Texas Instruments


LM25085 datasheet



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 R DS(ON) of the PFET or an external sense resistor can be used to sense current for over current detection.




1. Programmable Switching Frequency to 1MHz
2. No Loop Compensation Required
3. Ultra-Fast Transient Response
4. Adjustable Output Voltage from 1.25V
5. Integrated High Voltage Bias Regulator


1. Automotive Infotainment
2. Battery/Super Capacitor Chargers
3. LED Drivers

Other data sheets are available within the file:

LM25085-Q1, LM25085MM/NOPB, LM25085MME/NOPB, LM25085MMX/NOPB

LM25085 Datasheet PDF Download

LM25085 pdf