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 compensation required • Stable operation with ceramic output capacitors • Adjustable Soft-Start timing • Thermal shutdown • Precision 2% feedback reference 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 N-Channel 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.

LM25011   6.00 <= V in Lower  V   <= V in Upper  V   <= 42.00 V out 2.51 <=  V <= 40.00 I out    A <= 2.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM5005▲ 2.5A, 7-75V Step-down Regulator MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM25011 42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit	426 Kbytes	16-Oct-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1965: Application Note 1965 LM25011 Evaluation Board	378 Kbytes	30-May-09

More Application Notes

Title		Size	Date	Other Language
	AN-1431: Application Note 1431 LM25010 Evaluation Board	632 Kbytes	19-Dec-05

Design Tools

Title	Size	Date
LM25011 Quick Start Calculator	205 Kbytes	2-Jun-2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25011MY	ABCD5	0	5364	0	0	1626984	3	461661152
LM25011MYX	ABCD5	0	5364	0	0	1626984	3	461661152

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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