Features Ideal for conversion from 1.8V or 1.5V inputs Designed for use with low ESR ceramic capacitors 0.8V, 1.2V and 1.5V standard voltages available Ultra low dropout voltage (115mV @ 1.5A typ) 1.5% initial output accuracy Load regulation of 0.1%/A (typical) 30nA quiescent current in shutdown (typical) Low ground pin current at all loads Over temperature/over current protection Available in 5 lead TO220 and TO263 packages -40°C to +125°C junction temperature range Description The LP38842 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220 and TO-263 packages. Dropout Voltage: 115 mV (typ) @ 1.5A load current. Quiescent Current: 30 mA (typ) at full load. Shutdown Current: 30 nA (typ) when S/D# pin is low. Precision Output Voltage: 1.5% room temperature accuracy. Applications ASIC Power Supplies In: - Desktops, Notebooks, and Graphics Cards, Servers - Gaming Set Top Boxes, Printers and Copiers Server Core and I/O Supplies DSP and FPGA Power Supplies SMPS Post-Regulator

WEBENCH® LP38842     Min   Max   Range     VIN – V    0.88 – 5.50V     VOUT V    0.56 – 1.50V     IOUT A    ≤ 1.50A     Ambient Temp °C    ≤ 100°C   Footprint BOM Cost Efficiency What are WEBENCH® tools? Also Recommended LP38852▲ New! National's LP38k Family Of High LP38855▲ Performance LDOs Power Digital ICs LP38858▲ See More At LDO.NATIONAL.COM

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

Datasheets

Title		Size	Date	Other Language
	LP38842 1.5A Ultra Low Dropout Linear Regulators	646 Kbytes	11-Sep-06	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1457: Application Note 1457 LP3884X-ADJ Evaluation Board	431 Kbytes	16-Jun-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP38842S-0.8/NOPB LP38842S-0.8 RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 45 MOUSER Worldwide 180	$1.00 each at 1K+ pcs	rail of 45
LP38842S-1.2/NOPB LP38842S-1.2 RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 40 DIGI-KEY Worldwide 627 MOUSER Worldwide 160 NEWARK Americas 145	$1.00 each at 1K+ pcs	rail of 45
LP38842S-1.5/NOPB LP38842S-1.5 RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 180 DIGI-KEY Worldwide 148 MOUSER Worldwide 115 TAYLOR Americas 180	$1.00 each at 1K+ pcs	rail of 45
LP38842SX-0.8/NOPB LP38842SX-0.8 RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.00 each at 1K+ pcs	reel of 500
LP38842SX-1.2/NOPB LP38842SX-1.2 RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.00 each at 1K+ pcs	reel of 500
LP38842SX-1.5/NOPB LP38842SX-1.5 RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.00 each at 1K+ pcs	reel of 500
LP38842T-0.8/NOPB LP38842T-0.8 RoHS Status	TO-220	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 RS COMPONENTS Worldwide 45	$1.00 each at 1K+ pcs	rail of 45
LP38842T-1.2/NOPB LP38842T-1.2 RoHS Status	TO-220	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 180 RS COMPONENTS Worldwide 1	$1.00 each at 1K+ pcs	rail of 45
LP38842T-1.5/NOPB LP38842T-1.5 RoHS Status	TO-220	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 180	$1.00 each at 1K+ pcs	rail of 45

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 LP38842.

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 LP38842 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
LP38842S-0.8/NOPB LP38842S-0.8	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38842S -0.8
LP38842S-1.2/NOPB LP38842S-1.2	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38842S -1.2
LP38842S-1.5/NOPB LP38842S-1.5	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38842S -1.5
LP38842SX-0.8/NOPB LP38842SX-0.8	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38842S -0.8
LP38842SX-1.2/NOPB LP38842SX-1.2	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38842S -1.2
LP38842SX-1.5/NOPB LP38842SX-1.5	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38842S -1.5
LP38842T-0.8/NOPB LP38842T-0.8	1905.986 1908.876	TO-220	5	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LP38842T -0.8
LP38842T-1.2/NOPB LP38842T-1.2	1905.986 1908.876	TO-220	5	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LP38842T -1.2
LP38842T-1.5/NOPB LP38842T-1.5	1905.986 1908.876	TO-220	5	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LP38842T -1.5

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 LP38842.

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 LP38842 is located at RoHS Status.

CAD Symbols and Models Download LP38842 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP38842S-0.8	CS065	2	47473	43	0	5527000	1	1568301341
LP38842S-1.2	CS065	2	47473	43	0	5527000	1	1568301341
LP38842S-1.5	CS065	2	47473	43	0	5527000	1	1568301341
LP38842SX-0.8	CS065	2	47473	43	0	5527000	1	1568301341
LP38842SX-1.2	CS065	2	47473	43	0	5527000	1	1568301341
LP38842SX-1.5	CS065	2	47473	43	0	5527000	1	1568301341
LP38842T-0.8	CS065	2	47473	43	0	5527000	1	1568301341
LP38842T-1.2	CS065	2	47473	43	0	5527000	1	1568301341
LP38842T-1.5	CS065	2	47473	43	0	5527000	1	1568301341

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 LP38842.

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 LP38842 is located at RoHS Status.