LP38843 - 3A Fast-Response Ultra Low Dropout Linear Regulators

LP38843	3A Fast-Response Ultra Low Dropout Linear Regulators

Overview

Diagrams

Parametrics

Documents

Order

Packaging

Tools

Reliability

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 (210mV @ 3A 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 LP38843 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: 210 mV (typ) @ 3A 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® LP38843

Min Max Range

VIN – V    1.30 – 5.50V

VOUT V    0.80 – 0.80V

IOUT A    ≤ 3.00A

Ambient Temp °C    ≤ 100°C

Footprint BOM Cost Efficiency

What are WEBENCH® tools?

Also Recommended

LP38853▲ New! National's LP38k Family Of High

LP38856▲ Performance LDOs Power Digital ICs

LP38859▲ See More At LDO.NATIONAL.COM

Typical Application click for larger image

Block Diagram click for larger image

Typical Performance *click for larger image

Parameters / Values	LP38843	LP38853	LP38856	LP38859
Output Current	3000 mA	3000 mA	3000 mA	3000 mA
Output Min	1.2, 0.8, 1.5 Volt	0.8 Volt	1.2, 0.8 Volt	1.2, 0.8 Volt
Input Min Voltage	1.71, 1.41, 1.01 Volt	1.04 Volt	1.55, 1.15 Volt	1.55, 1.15 Volt
Input Max Voltage	5.5 Volt	5.5 Volt	5.5 Volt	5.5 Volt
Dropout Voltage	0.21 Volt	0.240 Volt	0.240 Volt	0.35 Volt
Adjustable Output	No	Yes	No	No
Quiescent Current	32 mA	10 mA	10 mA	10 mA
On/Off Pin	No	Yes	Yes	No
PowerGood / Error Flag	No	No	No	No
RegType	LDO	LDO	LDO	LDO
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C	125 deg C
Output Voltage	1.2, 0.8, 1.5 Volt		1.2, 0.8 Volt	1.2, 0.8 Volt
Output Max	1.2, 0.8, 1.5 Volt	1.8 Volt	1.2, 0.8 Volt	1.2, 0.8 Volt

Datasheets
Title Size Date Other
Language

LP38843 3A Fast-Response Ultra Low Dropout Linear Regulators 656
Kbytes 11-Sep-06 日本語

Part Number(s)
(NSID)

Top View

Availability

Current Reported Stock

Budgetary Pricing

Pack
Size

LP38843S-0.8/NOPB

LP38843S-0.8

RoHS Status

TO-263

Full production
Lead Time: 6 weeks

Distributor	Region	Qty
DIGI-KEY	Worldwide	45
MOUSER	Worldwide	180
RS COMPONENTS	Worldwide	22

$2.10 each at 1K+ pcs

rail
of
45

LP38843S-1.2/NOPB

LP38843S-1.2

RoHS Status

TO-263

Full production
Lead Time: 6 weeks

Distributor	Region	Qty
ARROW	Worldwide	22
AVNET-EM	Worldwide	212
DIGI-KEY	Worldwide	346
TAYLOR	Americas	22

$2.10 each at 1K+ pcs

rail
of
45

LP38843S-1.5/NOPB

LP38843S-1.5

RoHS Status

TO-263

Full production
Lead Time: 6 weeks

Distributor	Region	Qty
ARROW	Worldwide	125
AVNET-EM	Worldwide	247
DIGI-KEY	Worldwide	49
RS COMPONENTS	Worldwide	23
TAYLOR	Americas	125

$2.10 each at 1K+ pcs

rail
of
45

LP38843SX-0.8/NOPB

LP38843SX-0.8

RoHS Status

TO-263

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGI-KEY		Worldwide	0

$2.10 each at 1K+ pcs

reel
of
500

LP38843SX-1.2/NOPB

LP38843SX-1.2

RoHS Status

TO-263

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGI-KEY		Worldwide	0

$2.10 each at 1K+ pcs

reel
of
500

LP38843SX-1.5/NOPB

LP38843SX-1.5

RoHS Status

TO-263

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGI-KEY		Worldwide	0

$2.10 each at 1K+ pcs

reel
of
500

LP38843T-0.8/NOPB

LP38843T-0.8

RoHS Status

TO-220

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGI-KEY		Worldwide	45
MOUSER		Worldwide	180

$2.10 each at 1K+ pcs

rail
of
45

LP38843T-1.2/NOPB

LP38843T-1.2

RoHS Status

TO-220

Full production
Lead Time: 6 weeks

Distributor	Region	Qty
AVNET-EM	Worldwide	191
DIGI-KEY	Worldwide	105
RS COMPONENTS	Worldwide	34

$2.10 each at 1K+ pcs

rail
of
45

LP38843T-1.5/NOPB

LP38843T-1.5

RoHS Status

TO-220

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGI-KEY		Worldwide	175
MOUSER		Worldwide	180

$2.10 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 LP38843.

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 LP38843 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
LP38843S-0.8/NOPB LP38843S-0.8	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38843S -0.8
LP38843S-1.2/NOPB LP38843S-1.2	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38843S -1.2
LP38843S-1.5/NOPB LP38843S-1.5	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38843S -1.5
LP38843SX-0.8/NOPB LP38843SX-0.8	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38843S -0.8
LP38843SX-1.2/NOPB LP38843SX-1.2	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38843S -1.2
LP38843SX-1.5/NOPB LP38843SX-1.5	1448.647 1449.868	TO-263	5	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# LP38843S -1.5
LP38843T-0.8/NOPB LP38843T-0.8	1905.986 1908.876	TO-220	5	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LP38843T -0.8
LP38843T-1.2/NOPB LP38843T-1.2	1905.986 1908.876	TO-220	5	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LP38843T -1.2
LP38843T-1.5/NOPB LP38843T-1.5	1905.986 1908.876	TO-220	5	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LP38843T -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 LP38843.

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 LP38843 is located at RoHS Status.

CAD Symbols and Models
Download LP38843 CAD Symbols

Models
N/A

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)

LP38843S-0.8 CS065 2 47473 43 0 5527000 1 1568301341

LP38843S-1.2 CS065 2 47473 43 0 5527000 1 1568301341

LP38843S-1.5 CS065 2 47473 43 0 5527000 1 1568301341

LP38843SX-0.8 CS065 2 47473 43 0 5527000 1 1568301341

LP38843SX-1.2 CS065 2 47473 43 0 5527000 1 1568301341

LP38843SX-1.5 CS065 2 47473 43 0 5527000 1 1568301341

LP38843T-0.8 CS065 2 47473 43 0 5527000 1 1568301341

LP38843T-1.2 CS065 2 47473 43 0 5527000 1 1568301341

LP38843T-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 LP38843.

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 LP38843 is located at RoHS Status.

[Information as of 9-Feb-2012]

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