LP3966 - 3A Fast Ultra Low Dropout Linear Regulator

LP3966 - 3A Fast Ultra Low Dropout Linear Regulator

Datasheet	Packaging	Samples & Pricing	Reliability	Knowledge Base

Features

•	Ultra low dropout voltage
•	Low ground pin current
•	Load regulation of 0.06%
•	15µA quiescent current in shutdown mode
•	Guaranteed output current of 3A DC
•	Available in TO-263 and TO-220 packages
•	Output voltage accuracy ± 1.5%
•	Error# flag indicates output status (LP3963)
•	Sense option improves load regulation (LP3966)
•	Minimum output capacitor requirements
•	Overtemperature/overcurrent protection
•	-40°C to +125°C junction temperature range

General Description

The LP3963/LP3966 series of fast ultra low-dropout linear regulators operate from a +2.5V to +7.0V input supply. More...

Applications

•	Microprocessor power supplies
•	GTL, GTL+, BTL, and SSTL bus terminators
•	Power supplies for DSPs
•	SCSI terminator
•	Post regulators
•	High efficiency linear regulators
•	Battery chargers
•	Other battery powered applications

Typical Application

click for larger image

Parameters Values

Output Current 3000 mA

Output Min 1.8, 2.5, 3.3, 1.215 Volt

Input Min Voltage 2.5 Volt

Input Max Voltage 7 Volt

Dropout Voltage 0.8 Volt

Adjustable Output No, Yes

Quiescent Current 5 mA

On/Off Pin Yes

Error Flag No

RegType LDO

Temperature Min -40 deg C

Temperature Max 125 deg C

Output Voltage 1.8, 2.5, 3.3 Volt

Output Max 1.8, 2.5, 3.3, 5 Volt

Typical Performance

click for larger image

Also Recommended

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LP38859▲	See More At LDO.NATIONAL.COM

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LP3963/LP3966 3A Fast Ultra Low Dropout Linear Regulators	773 Kbytes	15-Sep-06	Download

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LP3966ET-1.8

5

NOPB

1

NA

Lifetime buy

N/A

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ET
-1.8

8 weeks

500

LP3966ET-2.5

5

NOPB

1

NA

Lifetime buy

N/A

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ET
-2.5

8 weeks

500

LP3966ET-3.3

5

NOPB

1

NA

Lifetime buy

N/A

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ET
-3.3

8 weeks

500

LP3966ET-5.0

5

NOPB

1

NA

Lifetime buy

N/A

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ET
-5.0

8 weeks

500

LP3966ET-ADJ

5

NOPB
STD

1
1

NA
NA

Full production

N/A

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ET
-ADJ

8 weeks

500

LP3966ES-5.0

5

NOPB

3

245

Lifetime buy

N/A

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ES
-5.0

8 weeks

500

LP3966ES-1.8

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ES
-1.8

8 weeks

500

LP3966ES-2.5

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ES
-2.5

8 weeks

500

LP3966ES-3.3

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ES
-3.3

8 weeks

500

LP3966ES-ADJ

5

NOPB
STD

3
3

245
235

Full production

N/A

Samples

Buy Now

1K+

$1.74

rail
of
45

NSUZXYTTE#
LP3966ES
-ADJ

8 weeks

2000

LP3966ESX-5.0

5

NOPB

3

245

Lifetime buy

N/A

Buy Now

1K+

$1.74

reel
of
500

NSUZXYTTE#
LP3966ES
-5.0

8 weeks

1000

LP3966ESX-1.8

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$1.74

reel
of
500

NSUZXYTTE#
LP3966ES
-1.8

8 weeks

1000

LP3966ESX-2.5

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$1.74

reel
of
500

NSUZXYTTE#
LP3966ES
-2.5

8 weeks

1000

LP3966ESX-3.3

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$1.74

reel
of
500

NSUZXYTTE#
LP3966ES
-3.3

8 weeks

1000

LP3966ESX-ADJ

5

NOPB
STD

3
3

245
235

Full production

N/A

Buy Now

1K+

$1.74

reel
of
500

NSUZXYTTE#
LP3966ES
-ADJ

8 weeks

1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LP3966ES-5.0	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LP3966ESX-5.0	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LP3966ET-1.8	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LP3966ET-2.5	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LP3966ET-3.3	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LP3966ET-5.0	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

General Description

The LP3963/LP3966 series of fast ultra low-dropout linear regulators operate from a +2.5V to +7.0V input supply. Wide range of preset output voltage options are available. These ultra low dropout linear regulators respond very quickly to step changes in load which makes them suitable for low voltage microprocessor applications. The LP3963/LP3966 are developed on a CMOS process which allows low quiescent current operation independent of output load current. This CMOS process also allows the LP3963/LP3966 to operate under extremely low dropout conditions.

Dropout Voltage: Ultra low dropout voltage; typically 80mV at 300mA load current and 800mV at 3A load current.

Ground Pin Current: Typically 6mA at 3A load current.

Shutdown Mode: Typically 15µA quiescent current when the shutdown pin is pulled low.

Error# Flag: Error# flag goes low when the output voltage drops 10% below nominal value (for LP3963).

SENSE: Sense pin improves regulation at remote loads. (For LP3966)

Precision Output Voltage: Multiple output voltage options are available ranging from 1.2V to 5.0V and adjustable (LP3966), with a guaranteed accuracy of ±1.5% at room temperature, and ±3.0% over all conditions (varying line, load, and temperature).

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP3966ES-1.8	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ES-2.5	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ES-3.3	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ES-5.0	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ES-ADJ	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ESX-1.8	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ESX-2.5	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ESX-3.3	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ESX-5.0	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ESX-ADJ	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ET-1.8	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ET-2.5	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ET-3.3	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ET-5.0	CS065	2	38968	52	0	4402000	1	1249079519
LP3966ET-ADJ	CS065	2	38968	52	0	4402000	1	1249079519

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.

[Information as of 8-Nov-2009]