Microchip | MIC2951-3.3YM

The MIC2951-3.3YM is a “bulletproof” micropower voltage regulator with very low dropout voltage (typically 40 mV at light loads and 250 mV at 100 mA), and very low quiescent current. Like their predecessors, the LP2950 and LP2951, the quiescent current of the MIC2950/MIC2951 increases only slightly in dropout, thus prolonging battery life. The MIC2950/MIC2951 are pin for pin compatible with the LP2950/LP2951, but offer lower dropout, lower quiescent current, reverse battery, and automotive load dump protection.

The key additional features and protection offered include higher output current (150 mA), positive transient protection for up to 60 V (load dump), and the ability to survive an unregulated input voltage transient of –20 V below ground (reverse battery).

These system functions 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 5 V output, or programmed from 1.24 V to 29 V with the use of two external resistors.

Key Features :

• High accuracy 3.3, 4.85, or 5 V, guaranteed 150 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 1.5 µF for stability
• Current and thermal limiting
• Unregulated DC input can withstand –20 V reverse battery
• and +60 V positive transients
• Error flag warns of output dropout (MIC2951)
• Logic-controlled electronic shutdown (MIC2951)
• Output programmable from 1.24 V to 29 V (MIC2951)

Applications :

• Automotive Electronics
• Battery Powered Equipment
• Cellular Telephones
• SMPS Post-Regulator
• Voltage Reference
• Avionics
• High Efficiency Linear Power Supplies