LP4951C

Features:

` High accuracy 5V guaranteed 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 1F for stability
`Current and Thermal Limiting




Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Supply Voltage −0.3 to +30V
SHUTDOWN Input Voltage,
Error Comparator Output
Voltage, (Note 9)
−0.3 to +30V
FEEDBACK Input Voltage −1.5 to +30V
(Note 9) (Note 10)
Power Dissipation Internally Limited
Junction Temperature (T_J) +150
Ambient Storage Temperature −65° to +150
Soldering Dwell Time, Temperature
Wave
Infrared
Vapor Phase
4 seconds, 260
10 seconds, 240
75 seconds, 219
ESD TBD
Operating Ratings (Note 1)
Maximum Input Supply Voltage 30V
Junction Temperature Range
(Note 8)
LP4950C, LP4951C −40 to 125

Output Current	100 mA
Output Min	1.24 Volt
Input Min Voltage	2.43 Volt
Input Max Voltage	30 Volt
Dropout Voltage	0.43 Volt
Adjustable Output	Yes
Quiescent Current	15 mA
On/Off Pin	Yes
Error Flag	Yes
RegType	LDO
Temperature Min	-40 deg C
Temperature Max	125 deg C
Output Max	29 Volt
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Description

`The LP4950C and LP4951C are micropower voltage regulators with very low quiescent current (75A 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 initialtolerance (.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.