Features • Integrated 40V, N-Channel buck switch • Integrated start-up regulator • Input Voltage Range: 8V to 36V • No loop compensation required • Ultra-Fast transient response • Operating frequency remains constant with load current and input voltage • Maximum Duty Cycle Limited During Start-Up • Adjustable output voltage • Valley Current Limit At 1.25A • Precision internal reference • Low bias current • Highly efficient operation • Thermal shutdown Description The LM34910 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load. This buck regulator contains a 40V N-Channel Buck Switch, and is available in the thermally enhanced LLP-10 package. The hysteretic 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 current limit detection is set at 1.25A. 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

LM34910   8.00 <= V in Lower  V   <= V in Upper  V   <= 36.00 V out 2.50 <=  V <= 36.00 I out    A <= 1.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM34910C▲ The 50V Rated Version Of The Original LM34910 Device. Complete JIT Positioning Material Available LM5010▲ Up Tp 75V Vin Range MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Connection Diagram click for larger image

Datasheet

Title		Size	Date	Other Language
	LM34910 High Voltage (40V, 1.25A) Step Down Switching Regulator	583 Kbytes	11-Feb-05

Featured Application Notes

Title		Size	Date	Other Language
	AN-1349: Application Note 1349 LM34910 Evaluation Board	562 Kbytes	18-Nov-04

More Application Notes

Title		Size	Date	Other Language
	AN-1601: Application Note 1601 LM34917A Evaluation Board	1142 Kbytes	10-Apr-08
	AN-1650: Application Note 1650 LM34919 Evaluation Board	338 Kbytes	8-Jun-07	中文
	AN-1549: Application Note 1549 LM34914 Evaluation Board	319 Kbytes	17-Mar-07

Design Tools

Title	Size	Date
LM34910 Quick Start Calculator	362 Kbytes	27-Jul-2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM34910SD	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM34910SDX	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.

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