Description The LP3927 system power management IC is designed for cellular/PCS handsets as well as other portable systems that require intelligent power management. Each device contains five low-dropout linear regulators (LDO's), a reset timer, a power-up control logic, a general-purpose open drain output that can be used to light LEDs, and a CMOS rail-to-rail input/output operational amplifier. Each linear regulator features an extremely low dropout voltage of 100 mV (typ) at maximum output current. LDO1 and LDO2 are powered on and off by either the KYBD or the VEXT# pin. LDO3, LDO4 and LDO5 each have its independent enable pin. LDO1 and LDO4 are rated at 150 mA each, LDO2 and LDO5 are rated at 200 mA each and LDO3 is rated at 100 mA. All LDO's are optimized for low noise and high isolation. The open drain output current sink can be programmed up to 150 mA by using an external low cost resistor. A single supply, low voltage operational amplifier has rail to rail input and output with 600 kHz of gain-bandwidth product. Key Specification 3.0V to 5.5V Input Voltage Range Two 200 mA, Two 150 mA and One 100 mA LDO's 100 mV typ Dropout Voltage @ IMAX 150 mA General-Purpose Open-drain programmable current sink for back light LED Low Voltage Rail to Rail Input/Output Operational Amplifier 28 pin LLP package Applications Cellular/PCS handsets PDA's, Palmtops, and portable terminals Single-Cell Li+ Systems 2- or 3- Cell NiMH, NiCd or Alkaline System

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

Datasheets

Title		Size	Date	Other Language
	LP3927 Cellular/PCS System Power Management IC	709 Kbytes	19-Dec-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP3927ILQ-AZ/NOPB LP3927ILQ-AZ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.16 each at 1K+ pcs	reel of 1000
LP3927ILQX-AJ RoHS Status	LLP	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.16 each at 1K+ pcs	reel of 4500
LP3927ILQX-AZ/NOPB LP3927ILQX-AZ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.16 each at 1K+ pcs	reel of 4500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LP3927ILQ-AJ	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

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 LP3927.

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 LP3927 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
LP3927ILQ-AZ/NOPB LP3927ILQ-AZ	59.866 60.094	LLP	28	3 1	260 260	Detail	Download	N/A	NS UZXYTTE# 3927-AZ
LP3927ILQX-AJ	60.094	LLP	28	1	260	Detail	Download	N/A	NS UZXYTTE# 3927-AJ
LP3927ILQX-AZ/NOPB LP3927ILQX-AZ	59.866 60.094	LLP	28	3 1	260 260	Detail	Download	N/A	NS UZXYTTE# 3927-AZ

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 LP3927.

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 LP3927 is located at RoHS Status.

CAD Symbols and Models Download LP3927 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP3927ILQ-AZ	CMOS7	0	21301	0	0	1584000	3	449464325
LP3927ILQX-AJ	CMOS7	0	21301	0	0	1584000	3	449464325
LP3927ILQX-AZ	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 LP3927.

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 LP3927 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LP3927ILQ-AJ	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008