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
● 0.9V Adjustable output voltage
● Precision ±2% Feedback reference
● Internal soft-start timer
● Integrated high voltage bias regulator
● Thermal shutdown
● Green product and no Sb/Br
●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.
