LP3891 - 0.8A Fast-Response Ultra Low Dropout Linear Regulators

Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

Features
•Ultra low dropout voltage (100mV @ 0.8A typ)
•Low ground pin current
•Load regulation of 0.04%/A
•60 nA typical quiescent current in shutdown
•1.5% output accuracy (25°C)
•TO-220, TO-263 and PSOP-8 packages
•Over temperature/over current protection
•-40°C to +125°C junction temperature range

General Description

The LP3891 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. More...


Applications

•DSP Power Supplies
•Server Core and I/O Supplies
•PC Add-in-Cards
•Local Regulators in Set-Top Boxes
•Microcontroller Power Supplies
•High Efficiency Power Supplies
•SMPS Post-Regulators
  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Output Current 800 mA
Output Min 1.8, 1.2, 1.5 Volt
Dropout Voltage 0.1 Volt
Adjustable Output No
Quiescent Current 3 mA
Output Current 800 mA
Input Min Voltage 1.3, 1.9, 1.6 Volt
Input Max Voltage 5.5 Volt
Output Min 1.8, 1.2, 1.5 Volt
Dropout Voltage 0.1 Volt
Adjustable Output No
Quiescent Current 3 mA
On/Off Pin Yes
Error Flag No
RegType LDO
Temperature Min -40 deg C
Temperature Max 125 deg C
Output Voltage 1.8, 1.2, 1.5 Volt
Output Max 1.8, 1.2, 1.5 Volt
View Using Catalog


Typical Performance

click for larger image


  Also Recommended
LP3881Has Less Than Half The Dropout Voltage
LP38841Vout Down To 0.56V, Vin Down To 1.05V
LP38921.5A Version

Additional Resources

Application Notes (see below)


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to View Online Click link below to Download Click link below to Receive via Email
LP3891 0.8A Fast-Response Ultra Low Dropout Linear Regulators 737 Kbytes 21-Jun-06 View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LP3891EMR-1.2PSOP8STD
NOPB		2
3		235
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.20rail
of
95		NSXYTT
3891E
MR1.2
8 weeks2000
LP3891EMR-1.5PSOP8NOPB3260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.20rail
of
95		NSXYTT
3891E
MR1.5
8 weeks2000
LP3891EMR-1.8PSOP8STD
NOPB		2
3		235
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.20rail
of
95		NSXYTT
3891E
MR1.8
8 weeks500
LP3891EMRX-1.2PSOP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20reel
of
2500		NSXYTT
3891E
MR1.2
8 weeks3000
LP3891EMRX-1.5PSOP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20reel
of
2500		NSXYTT
3891E
MR1.5
8 weeks3000
LP3891EMRX-1.8PSOP8RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20reel
of
2500		NSXYTT
3891E
MR1.8
16 weeksN/A
LP3891ET-1.2TO-2205NOPB1NARoHS Download Full productionN/A
 
Buy Now 		1K+$1.20rail
of
45		NSUZXYTTE#
LP3891ET
-1.2
8 weeks500
LP3891ET-1.5TO-2205NOPB1NARoHS Download Full productionN/A
 
Buy Now 		1K+$1.20rail
of
45		NSUZXYTTE#
LP3891ET
-1.5
8 weeks500
LP3891ET-1.8TO-2205NOPB1NARoHS Download Full productionN/A
 
Buy Now 		1K+$1.20rail
of
45		NSUZXYTTE#
LP3891ET
-1.8
8 weeks500
LP3891ES-1.2TO-2635NOPB3245RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.20rail
of
45		NSUZXYTTE#
LP3891ES
-1.2
8 weeks1000
LP3891ES-1.5TO-2635NOPB3245RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.20rail
of
45		NSUZXYTTE#
LP3891ES
-1.5
8 weeks500
LP3891ES-1.8TO-2635STD
NOPB		3
3		235
245		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20rail
of
45		NSUZXYTTE#
LP3891ES
-1.8
8 weeks500
LP3891ESX-1.2TO-2635NOPB3245RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20reel
of
500		NSUZXYTTE#
LP3891ES
-1.2
8 weeks2500
LP3891ESX-1.5TO-2635NOPB3245RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20reel
of
500		NSUZXYTTE#
LP3891ES
-1.5
8 weeks2000
LP3891ESX-1.8TO-2635NOPB3245RoHS Download Full productionN/A
 
Buy Now 		1K+$1.20reel
of
500		NSUZXYTTE#
LP3891ES
-1.8
8 weeks2000

General Description

The LP3891 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 architectutre 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, TO-263 and PSOP-8 packages.

Dropout Voltage: 100 mV (typ) @ 0.8A load current.

Ground Pin Current: 3 mA (typ) at full load.

Shutdown Current: 60 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature accuracy.

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LP3891EMR-1.2CS06512621539029170002827706714
LP3891EMR-1.5CS06512621539029170002827706714
LP3891EMR-1.8CS06512621539029170002827706714
LP3891EMRX-1.2CS06512621539029170002827706714
LP3891EMRX-1.5CS06512621539029170002827706714
LP3891EMRX-1.8CS06512621539029170002827706714
LP3891ES-1.2CS06512621539029170002827706714
LP3891ES-1.5CS06512621539029170002827706714
LP3891ES-1.8CS06512621539029170002827706714
LP3891ESX-1.2CS06512621539029170002827706714
LP3891ESX-1.5CS06512621539029170002827706714
LP3891ESX-1.8CS06512621539029170002827706714
LP3891ET-1.2CS06512621539029170002827706714
LP3891ET-1.5CS06512621539029170002827706714
LP3891ET-1.8CS06512621539029170002827706714

For more information on Reliability Metrics, please click here.


Application Notes

TitleSize in Kbytes Date Click link below to View Online Click link below to Download Click link below to Receive via Email
AN-1219: Application Note 1219 LP3985 MicroSMD-5 Evaluation Board Instruction 36 Kbytes 25-Sep-02 View Online Download Receive via Email

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[Information as of 29-Aug-2008]