MIC2950*/2951
150mA Low-Dropout Voltage Regulator
General Description
Features
The MIC2950 and MIC2951 are “bulletproof” micropower
•
High accuracy 3.3, 4.85, or 5V, guaranteed 150mA
voltage regulators with very low dropout voltage (typically
output
40mV at light loads and 250mV at 100mA), and very low
•
Extremely low quiescent current
quiescent current. Like their predecessors, the LP2950 and
•
Low-dropout voltage
LP2951, the quiescent current of the MIC2950/MIC2951
•
Extremely tight load and line regulation
increases only slightly in dropout, thus pro-longing battery
•
Very low temperature coefficient
life. The MIC2950/MIC2951 are pin for pin compatible with
•
Use as regulator or reference
the LP2950/LP2951, but offer lower dropout, lower
•
Needs only 1.5µF for stability
quiescent current, reverse battery, and automotive load
dump protection.
•
Current and thermal limiting
•
Unregulated DC input can withstand –20V reverse
The key additional features and protection offered include
battery and +60V positive transients
higher output current (150mA), positive transient protection
for up to 60V (load dump), and the ability to survive an
MIC2951 Version Only
unregulated input voltage transient of –20V below ground
•
Error flag warns of output dropout
(reverse battery).
•
Logic-controlled electronic shutdown
The plastic DIP and SOIC versions offer additional system
•
Output programmable from 1.24 to 29V
functions such as programmable output voltage and logic
controlled shutdown. The 3-pin TO-92 MIC2950 is pin-
compatible with the older 5V regulators.
Applications
These system functions also include an error
flag
output
•
Automotive electronics
that warns of a low output voltage, which is often due to
•
Voltage reference
failing batteries on the input. This may also be used as a
•
Avionics
power-on reset. A logic-compatible shutdown input is also
available which enables the regulator to be switched on and
•
Cellular telephones
off. This part may also be pin-strapped for a 5 V output, or
•
Battery powered equipment
programmed from 1.24 V to 29 V with the use of two
•
SMPS post-regulator
external resistors.
•
High efficiency linear power supplies
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Block Diagram
* MIC2950 Discontinuance September 2007.
MM8 is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2010
M9999-021610