5V and Adjustable Micropower Low-Dropout Voltage
The LP2954 is a 5V micropower voltage regulator with very
low quiescent current (90 µA typical at 1 mA load) and very
low dropout voltage (typically 60 mV at light loads and
470 mV at 250 mA load current).
The quiescent current increases only slightly at dropout
(120 µA typical), which prolongs battery life.
The LP2954 with a fixed 5V output is available in the
three-lead TO-220 and TO-263 packages. The adjustable
LP2954 is provided in an 8-lead surface mount, small outline
package. The adjustable version also provides a resistor net-
work which can be pin strapped to set the output to 5V.
Reverse battery protection is provided.
The tight line and load regulation (0.04% typical), as well as
very low output temperature coefficient make the LP2954
well suited for use as a low-power voltage reference.
Output accuracy is guaranteed at both room temperature
and over the entire operating temperature range.
n 5V output within 1.2% over temperature (A grade)
n Adjustable 1.23 to 29V output voltage available
(LP2954IM and LP2954AIM)
n Guaranteed 250 mA output current
n Extremely low quiescent current
n Low dropout voltage
n Reverse battery protection
n Extremely tight line and load regulation
n Very low temperature coefficient
n Current and thermal limiting
n Pin compatible with LM2940 and LM340 (5V version
n Adjustable version adds error flag to warn of output drop
and a logic-controlled shutdown
n High-efficiency linear regulator
n Low dropout battery-powered regulator
Package Outline and Ordering Information
TO-220 3–Lead Plastic Package
SO-8 Small Outline Surface Mount
Order Number LP2954AIT or LP2954IT
See NS Package T03B
Order Number LP2954AIM or LP2954IM
See NS Package M08A
© 1999 National Semiconductor Corporation DS011128