LM25011 Datasheet | National Semiconductor

Description The LM25011 Constant On-time Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying up to 2A of load current. This high voltage regulator contains an NChannel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop pensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit. Features - - - - - - - - - - - - - - - Input operating voltage range: 6V to 42V Absolute maximum input rating: 45V Integrated 2A N-Channel Buck Switch Adjustable current limit Adjustable output voltage from 2.51V Minimum ripple voltage at VOUT Power Good output Switching frequency adjustable to 2 MHz Switching frequency remains nearly constant with load current and input voltage variations Ultra-fast transient response No loop pensation required Stable operation with ceramic output capacitors Adjustable Soft-Start timing Thermal shutdown Precision 2% feedback reference Package - MSOP-10EP Typical Application, Basic Step-Down Regulator © 2009 National Semiconductor Corporation .national. .. Connection Diagram Top View 10 Lead MSOP-EP Ordering Information Order Number LM25011MY LM25011MYX Package Type MSOP-10EP MSOP-10EP NSC Package Drawing MUC10A MUC10A Supplied As 1000...