Features All LLP options are available as AEC-Q100 Grade 1 Output voltage range of 1.25V - 9V 2.0% adjust pin voltage accuracy (25°C) Low dropout voltage: 250mV @ 500mA (typ, 5V out) Wide input voltage range (2.7V to 10V) Precision (trimmed) bandgap reference Guaranteed specs for -40°C to +125°C 1µA off-state quiescent current Thermal overload protection Foldback current limiting SOT-223 and 6-Lead LLP packages Enable pin (LP38693-ADJ) Description The LP38691/3-ADJ low dropout CMOS linear regulators provide 2.0% precision reference voltage, extremely low dropout voltage (250mV @ 500mA load current, VOUT = 5V) and excellent AC performance utilizing ultra low ESR ceramic output capacitors. The low thermal resistance of the LLP and SOT-223 packages allow the full operating current to be used even in high ambient temperature environments. The use of a PMOS power transistor means that no DC base drive current is required to bias it allowing ground pin current to remain below 100 µA regardless of load current, input voltage, or operating temperature. Dropout Voltage: 250 mV (typ) @ 500mA (typ. 5V out). Ground Pin Current: 55 µA (typ) at full load. Adjust Pin Voltage: 2.0% (25°C) accuracy. Applications Hard Disk Drives Notebook Computers Battery Powered Devices Portable Instrumentation

Also Recommended LP38501-ADJ▲ New! National's LP38k Family Of High LP38503-ADJ▲ Performance LDOs Power Digital ICs LP38853▲ See More At LDO.NATIONAL.COM

Typical Application click for larger image	Block Diagram click for larger image LP38691-ADJ Internal Block Diagram
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LP38691-ADJ 500mA Low Dropout CMOS Linear Regulators with Adjustable Output Stable with Ceramic Output Capacitors	405 Kbytes	27-Jun-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP38691QSD-ADJ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	reel of 1000
LP38691QSDX-ADJ/NOPB RoHS Status	LLP	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	reel of 4500
LP38691SD-ADJ/NOPB LP38691SD-ADJ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 18900 AVNET-EM Worldwide 674 DIGI-KEY Worldwide 7263 FARNELL Europe and Asia 1816 NEWARK Americas 722 RS COMPONENTS Worldwide 25 TAYLOR Americas 18900	$0.53 each at 1K+ pcs	reel of 1000
LP38691SDX-ADJ/NOPB LP38691SDX-ADJ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 4500 DIGI-KEY Worldwide 0 TAYLOR Americas 4500	$0.53 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 LP38691-ADJ.

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 LP38691-ADJ 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
LP38691QSD-ADJ/NOPB		LLP	6	1	260	Detail	N/A	N/A	ZXYTT L251B
LP38691QSDX-ADJ/NOPB		LLP	6	1	260	Detail	N/A	N/A	ZXYTT L251B
LP38691SD-ADJ/NOPB LP38691SD-ADJ	21.032 21.102	LLP	6	1 1	260 260	Detail	N/A	N/A	ZXYTT L117B
LP38691SDX-ADJ/NOPB LP38691SDX-ADJ	21.032 21.102	LLP	6	1 1	260 260	Detail	N/A	N/A	ZXYTT L117B

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 LP38691-ADJ.

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 LP38691-ADJ is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP38691QSD-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958
LP38691QSDX-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958
LP38691SD-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958
LP38691SDX-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958

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 LP38691-ADJ.

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 LP38691-ADJ is located at RoHS Status.