The LM25085AMME/NOPB is a constant on-time non-synchronous PFET Buck Controller with 0.9V reference. It 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 4.5 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 RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
Adjustable current limit using RDS(ON) or a current sense resistor
No loop compensation required
Ultra-fast transient response
Nearly constant operating frequency with line and load variations
(EN)
