Features • LM25574Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (−40°C to + 125°C operating junction temperature) • Integrated 42V, 750mΩ N-channel MOSFET • Ultra-wide input voltage range from 6V to 42V • Adjustable output voltage as low as 1.225V • 1.5% feedback reference accuracy • Operating frequency adjustable between 50kHz and 1MHz with single resistor • Master or slave frequency synchronization • Adjustable soft-start • Emulated current mode control architecture • Wide bandwidth error amplifier • Built-in protection • Automotive Grade product datasheet that is AEC-Q100 grade 0 qualified is available upon request. • (−40°C to + 150°C operating junction temperature) Description The LM25574 is an easy to use SIMPLE SWITCHER® buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6 - 42V, the LM25574 delivers 0.5A of continuous output current with an integrated 750mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 1MHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM25574 guarantees robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a TSSOP-16 package. The LM25574 is supported by the full suite of WEBENCH On-Line design tools. Applications • Automotive • Industrial

LM25574   6.00 <= V in Lower  V   <= V in Upper  V   <= 42.00 V out 1.23 <=  V <= 42.00 I out    A <= 0.50 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM25575▲ 42V Input Voltage Max, 1.5A Output Current LM25576▲ 42V Input Voltage Max, 3A Output Current LM34919▲ 40V, 600mA Step Down COT Switching Regulator LM5574▲ 75V Input Voltage Max, 0.5A Output Current LM5575▲ 75V Input Voltage Max, 1.5A Output Current LM5576▲ 75V Input Voltage Max, 3A Output Current 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
	LM25574/LM25574Q SIMPLE SWITCHER® 42V, 0.5A Step-Down Switching Regulator	439 Kbytes	23-Feb-09	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1577: Application Note 1577 LM25574 Evaluation Board	153 Kbytes	18-Mar-07	日本語 中文
	AN-1563: Application Note 1563 Quick Start Guide for a 0.5 Amp Buck Regulator Using The LM5574 and LM25574	89 Kbytes	17-Mar-07	日本語 中文

More Application Notes

Title		Size	Date	Other Language
	AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs	370 Kbytes	7-Feb-07	日本語 中文
	AN-1572: Application Note 1572 Quick Start Guide for a 3 Amp Buck Regulator Using the LM5576 and LM25576	91 Kbytes	18-Mar-07	日本語 中文
	AN-1571: Application Note 1571 Quick Start Guide for a 1.5 Amp Buck Regulator Using the LM5575 and LM25575	91 Kbytes	18-Mar-07	日本語 中文
	AN-1579: Application Note 1579 LM25576 Evaluation Board	157 Kbytes	18-Mar-07	日本語 中文
	AN-1578: Application Note 1578 LM25575 Evaluation Board	157 Kbytes	18-Mar-07	日本語 中文

Design Tools

Title	Size	Date
Current Mode Modeling - Reference Guide	1372 Kbytes	1-Aug-2007
Understanding and Applying Current-Mode Control Theory	427 Kbytes	8-Jan-2008
Downloadable LM(2)557x Quick Start SIMPLE SWITCHER Component Calculator	230 Kbytes	28-Jun-2007

Reference Design

RD-128 - LM25576 Reference Design 6-42V input, 5V 3A output

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25574MT	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25574MTX	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25574QMT	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25574QMTX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

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.

For more information on Reliability Metrics, please click here.