Features Integrated 55V, N-Channel buck switch Integrated start-up regulator Input Voltage Range: 8V to 50V 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 LM34910C 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 55V 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.

WEBENCH® LM34910C     Min   Max   Range     VIN – V    8.00 – 50.00V     VOUT V    2.50 – 47.00V     IOUT A    ≤ 1.00A     Ambient Temp °C    ≤ 100°C   Footprint BOM Cost Efficiency What are WEBENCH® tools?

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

Datasheets

Title		Size	Date	Other Language
	LM34910C High Voltage (50V, 1.25A) Step Down Switching Regulator	271 Kbytes	24-Aug-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM34910CSD/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 800 DIGI-KEY Worldwide 1942 MOUSER Worldwide 800 RS COMPONENTS Worldwide 45	$1.32 each at 1K+ pcs	reel of 1000
LM34910CSDE/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 500	$1.32 each at 1K+ pcs	reel of 250
LM34910CSDX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.32 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM34910C.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM34910C is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM34910CSD/NOPB	39.757	LLP	10	1	260	Detail	Download	N/A	NS UZXYTT L34910C
LM34910CSDE/NOPB	39.757 39.906	LLP	10	1	260	Detail	Download	N/A	NS UZXYTT L34910C
LM34910CSDX/NOPB	39.757	LLP	10	1	260	Detail	Download	N/A	NS UZXYTT L34910C

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM34910C.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM34910C is located at RoHS Status.

Design Tools

Title	Size	Date
LM34910C Quick Start Calculator

CAD Symbols and Models Download LM34910C CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM34910CSD	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM34910CSDE	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM34910CSDX	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.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM34910C.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM34910C is located at RoHS Status.