Features • Input power from 1V to 16V • Output voltage adjustable down to 0.6V • Power Good flag, adjustable soft-start and output enable for easy power sequencing • Reference Accuracy: 1.5% (0°C - 125°C) • Current limit without sense resistor • Soft start • Switching frequency from 50 kHz to 2 MHz • 40ns typical minimum on-time • TSSOP-14 package Description The LM2742 is a high-speed, synchronous, switching regulator controller. It is intended to control currents of 0.7A to 20A with up to 95% conversion efficiencies. Power up and down sequencing is achieved with the power-good flag, adjustable soft-start and output enable features. The LM2742 operates from a low-current 5V bias and can convert from a 1V to 16V power rail. The part utilizes a fixed-frequency, voltage-mode, PWM control architecture and the switching frequency is adjustable from 50kHz to 2MHz by setting the value of an external resistor. Current limit is achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which enables on-times on the order of 40ns, one of the best in the industry. The wide range of operating frequencies gives the power supply designer the flexibility to fine-tune component size, cost, noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap structure helps to further maximize efficiency. The high-side power FET drain voltage can be from 1V to 16V and the output voltage is adjustable down to 0.6V. Applications • POL power supply modules • Cable Modems • Set-Top Boxes/ Home Gateways • DDR Core Power • High-Efficiency Distributed Power • Local Regulation of Core Power

Also Recommended LM2737▲ Identical Except That The Low-side FET Is On During Shutdown LM2743▲ Vcc Down To 3.0V LM2745▲ Has Clock Syncronization (Sync Pin), Pre-Biased Load Startup And 3.0V Min Vcc LM5115 75V Max Vin Sync Buck Controller 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
	LM2742 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages	657 Kbytes	31-Oct-07	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1325: Application Note 1325 LM2742 Evaluation Board	607 Kbytes	1-Apr-04
	AN-1603: Application Note 1603 LM274X Reference Designs	431 Kbytes	6-Dec-07	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1437: Application Note 1437 Current Limit Foldback Improves Short Circuit Protection in LM274X Family	470 Kbytes	25-May-06	中文
	AN-1573: Application Note 1573 LM2745-19A Demo Board	2572 Kbytes	17-May-07
	AN-1640: Application Note 1640 LM2743-19A Demo Board	2570 Kbytes	17-May-07	中文
	AN-1641: Application Note 1641 LM2747-19A Demo Board	2571 Kbytes	17-May-07
	AN-1357: Application Note 1357 LM2744 Evaluation Board	1794 Kbytes	5-Oct-05	中文
	AN-1449: Application Note 1449 LM2747 Evaluation Board	594 Kbytes	11-Apr-06
	AN-1385: Application Note 1385 LM2746 Evaluation Board	1743 Kbytes	1-Jun-05	中文
	AN-1356: Application Note 1356 LM2743 Evaluation Board	1785 Kbytes	5-Oct-05	日本語 中文

Design Tools

Title	Size	Date
Power Reference Design Library

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2742MTC	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2742MTCX	ABCD150	0	34175	0	0	4234000	1	1201409060

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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