Features • Integrated N-Channel buck switch • Integrated start-up regulator • Input Voltage Range: 8V to 30V • No loop compensation required • Ultra-Fast transient response • Operating frequency remains constant with load current and input voltage variations • Maximum Duty Cycle Limited During Start-Up • Adjustable output voltage • Valley Current Limit At 0.6A • Maximum switching frequency: 1 MHz • Precision internal reference • Low bias current • Highly efficient operation • Thermal shutdown Description The LM2694 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in the 3 x 3 thermally enhanced LLP-10 package and a TSSOP-14 package. The feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter. Applications • High Efficiency Point-Of-Load (POL) Regulator • Non-Isolated Telecommunication Buck Regulator • Secondary High Voltage Post Regulator

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

Datasheet

Title		Size	Date	Other Language
	LM2694 30V, 600 mA Step Down Switching Regulator	764 Kbytes	12-May-06	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1472: Application Note 1472 LM2694 Evaluation Board	796 Kbytes	16-May-06

More Application Notes

Title		Size	Date	Other Language
	AN-1202: Application Note 1202 LM2698 Demoboard	217 Kbytes	10-May-04
	AN-1444: Application Note 1444 LM2695 Evaluation Board	716 Kbytes	15-Feb-06
	AN-1410: Application Note 1410 LM2696 Demonstration Board	566 Kbytes	14-Aug-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2694MT	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2694MTX	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2694SD	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2694SDX	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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