LM25011 42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
www.DataSheet4U.com
June 1, 2009
L...
LM25011 42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
www.DataSheet4U.com
June 1, 2009
LM25011
42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
General 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 compensation, 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
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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 M...