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LP2951J/883
Series of Adjustable Micropower Voltage Regulators
LP2950/LP2951
Series of Adjustable Micropower V oltage Regulators
General DescriptionThe LP2950 and LP2951 are micropower voltage regulators
with very low quiescent current (75µA typ.) and very low
dropout voltage (typ. 40mVat light loads and 380mVat
100mA). They are ideally suitedfor usein battery-powered
systems. Furthermore,the quiescent currentofthe LP2950/
LP2951 increases only slightlyin dropout, prolonging battery
life.
The LP2950-5.0is availablein the surface-mount D-Pak
package, andin the popular 3-pin TO-92 packagefor pin-
compatibility with older5V regulators. The 8-lead LP2951is
availablein plastic, ceramic dual-in-line, LLP,or metal can
packages and offers additional system functions.
One such featureisan error flag output which warnsofa low
output voltage, often dueto falling batteriesonthe input.It
maybe usedfora power-on reset.A second featureis the
logic-compatible shutdown input which enablesthe regulatorbe switchedon andoff. Also,the part maybe pin-strapped
fora 5V, 3V,or 3.3V output (dependingon the version),or
programmed from 1.24Vto 29V withan external pairof
resistors.
Careful designof the LP2950/LP2951 has minimizedall
contributionsto the error budget. This includesa tight initial
tolerance (.5% typ.), extremely good load and line regulation
(.05% typ.) anda very low output voltage temperature coef-
ficient, makingthe part usefulasa low-power voltage refer-
ence.
Features 5V, 3V, and 3.3V versions available High accuracy output voltage Guaranteed 100mA output current Extremely low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Useas Regulatoror Reference Needs minimum capacitancefor stability Current and Thermal Limiting Stable with low-ESR output capacitors (10mΩto 6Ω)
LP2951 versions only Error flag warnsof output dropout Logic-controlled electronic shutdown Output programmable from 1.24to 29V
Block Diagram and Typical Applications
LP2950 LP2951May 2005
LP2950/LP2951
Series
Adjustable
Micropower
oltage
Regulators
