Features Low, 140mV, Dropout at 250mA Load. Stable with Ceramic Capacitor. Low Noise, with Bypass Capacitor. Less than 80µA Typical IQ at 250mA. Virtually Zero IQ (Disabled). Thermal and Short Circuit Protection. 3.3V Output. For other voltage options contact your NSC sales office Description The LP3997 regulator is designed to meet the requirements of portable, battery-powered systems, providing accurate output voltage, low noise, and low quiescent current. The LP3997 provides 3.3V output at up to 250mA load current. The chip architecture is capable of providing output voltages as low as 0.8V. When switched in shutdown mode, the power consumption is virtually zero. The LP3997 is designed to be stable with space saving ceramic output capacitor as small as 1µF. The LP3997 also includes an out-of-regulation error flag. When the output is more than 5% below its nominal voltage, the error flag sets to low. If a capacitor is connected to device's delay pin, a delayed power-on reset signal will be generated. Applications Portable Consumer Electronics Cellular Handsets Laptop and Palm Computers PDA's Digital Cameras

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

Datasheets

Title		Size	Date	Other Language
	LP3997 Micropower 250mA CMOS LDO Regulator with Error Flag / Power-On-Reset	660 Kbytes	26-May-05

Application Notes

Title		Size	Date	Other Language
	AN-2146: Application Note 2146 Power Design for SDI and other Noise Sensitive Devices	516 Kbytes	9-Aug-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP3997MM-3.3/NOPB LP3997MM-3.3 RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 24000 AVNET-EM Worldwide 1000 DIGI-KEY Worldwide 10023 MOUSER Worldwide 885 TAYLOR Americas 24000	$0.41 each at 1K+ pcs	reel of 1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LP3997MMX-3.3	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

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 LP3997.

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 LP3997 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
LP3997MM-3.3/NOPB LP3997MM-3.3	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT SAKB

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 LP3997.

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 LP3997 is located at RoHS Status.

CAD Symbols and Models Download LP3997 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP3997MM-3.3	CMOS7	0	21301	0	0	1584000	3	449464325

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 LP3997.

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 LP3997 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LP3997MMX-3.3	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009