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LP2950

National Semiconductor
Part Number LP2950
Manufacturer National Semiconductor
Description Micropower Voltage Regulators
Published Oct 8, 2006
Detailed Description LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators September 2003 LP2950/LP2951 Series of Adjustable Mi...
Datasheet PDF File LP2950 PDF File

LP2950
LP2950

Overview
LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators September 2003 LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators General Description The LP2950 and LP2951 are micropower voltage regulators with very low quiescent current (75µA typ.
) and very low dropout voltage (typ.
40mV at light loads and 380mV at 100mA).
They are ideally suited for use in battery-powered systems.
Furthermore, the quiescent current of the LP2950/ LP2951 increases only slightly in dropout, prolonging battery life.
The LP2950-5.
0 is available in the surface-mount D-Pak package, and in the popular 3-pin TO-92 package for pincompatibility with older 5V regulators.
The 8-lead LP2951 is available in plastic, ceramic dual-in-line, or metal can packages and offers additional system functions.
One such feature is an error flag output which warns of a low output voltage, often due to falling batteries on the input.
It may be used for a power-on reset.
A second feature is the logic-compatible shutdown input which enables the regulator to be switched on and off.
Also, the part may be pin-strapped for a 5V, 3V, or 3.
3V output (depending on the version), or programmed from 1.
24V to 29V with an external pair of resistors.
Careful design of the LP2950/LP2951 has minimized all contributions to the error budget.
This includes a tight initial tolerance (.
5% typ.
), extremely good load and line regulation (.
05% typ.
) and a very low output voltage temperature coefficient, making the part useful as a low-power voltage reference.
Features n 5V, 3V, and 3.
3V versions available n High accuracy output voltage n Guaranteed 100mA output current n Extremely low quiescent current n Low dropout voltage n Extremely tight load and line regulation n Very low temperature coefficient n Use as Regulator or Reference n Needs minimum capacitance for stability n Current and Thermal Limiting n Stable with low-ESR output capacitors LP2951 versions only n Error flag warns of output dropout n Logic-contro...


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