Datasheet LP2951 (Microchip)

LP2951
100 mA Low-Dropout Voltage Regulator
Features General Description •
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• The LP2951 is micropower voltage regulators with very
low dropout voltage (typically 40 mV at light loads and
380 mV at 100 mA), and very low quiescent current
(75 μA typical). The quiescent current of the LP2951
increases only slightly in dropout, thus prolonging
battery life. This feature, among others, makes the
LP2951 ideally suited for use in battery-powered
systems. High Accuracy 5V, Guaranteed 100 mA Output
Extremely Low Quiescent Current
Low-Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Use as Regulator or Reference
Needs Only 1 μF for Stability
Current and Thermal Limiting
Error Flag Warns of Output Dropout
Logic-Controlled Electronic Shutdown
Output Programmable from 1.24V to 29V Applications
• Automotive Electronics
• Voltage Reference
• Avionics Available system functions, such as programmable
output voltage and logic-controlled shutdown, are
available as well.
Additional features available with the LP2951 also
include an error flag output that warns of a low output
voltage, which is often due to failing batteries on the
input. This may also be used as a power-on reset. A
logic-compatible shutdown input is also available which
enables the regulator to be switched on and off. This
part may also be pin-strapped for a 5V output, or
programmed from 1.24V to 29V with the use of two
external resistors.
The LP2951 is available as either a -02 or -03 version.
The -02 and -03 versions are guaranteed for junction
temperatures from -40°C to +125°C; the -02 version
has a tighter output and reference voltage specification
range over temperature.
The LP2951 have a tight initial tolerance (0.5% typical),
a very low output voltage temperature coefficient which
allows use as a low-power voltage reference, and
extremely good load and line regulation (0.05%
typical). This greatly reduces the error in the overall
circuit, and is the result of careful design techniques
and process control. Package Types
LP2951
DIP & SOIC
Top View
1 8 SENSE 2 7 SHUTDOWN 3 6 4 5 OUTPUT GROUND INPUT
FEEDBACK
5V TAP
ERROR * See MIC2950 for a part with: 1) higher output
(150 mA), 2) transient protection (60V), and 3) reverse
input protection to –20V.  2017 Microchip Technology Inc. DS20005736A-page 1