1FEATURES
2• High Accuracy 5V Specified 100mA 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 1μF for Stability
• Current and Thermal Limiting

LP4951C VERSIONS ONLY
• Error Flag Warns of Output Dropout
• Logic-controlled Electronic Shutdown
• Output Pogrammable From 1.24 to 29V

DESCRIPTION
The LP4950C and LP4951C 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 LP4950C/LP4951C increases only slightly in dropout, prolonging battery
life.
The LP4950C in the popular 3-pin TO-92 package is
pin compatible with older 5V regulators. The 8-lead
LP4951C is available in a plastic surface mount
package 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
output or programmed from 1.24V to 29V with an
external pair of resistors.
Careful design of the LP4950C/LP4951C 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.