MIC2940A

The MIC2940A and MIC2941A are "bulletproof" efficient voltage regulators with very low dropout voltage (typically 40mV at light loads and 350mV at 1A) and low quiescent current (240µA typical). The quiescent current of the MIC2940A increases only slightly in dropout, thus prolonging battery life. Key MIC2940A features include protection against reversed battery, fold-back current limiting, and automotive load-dump protection (60V positive transient).

The MIC2940 is available in both fixed voltage (3.3V, 5V, and 12V) and adjustable voltage configurations. The MIC2940A-xx devices are 3-pin fixed voltage regulators. A logic-compatible shutdown input is provided on the adjustable MIC2941A, which enables the regulator to be switched on and off.

Features
  • High output voltage accuracy
  • Guaranteed 1.25A output
  • Low quiescent current
  • Low dropout voltage
  • Extremely tight load and line regulation
  • Very low temperature coefficient
  • Current and thermal limiting
  • Input can withstand -20V reverse battery and +60V positive transients
  • Logic-controlled electronic shutdown
  • Output programmable from 1.24V to 26V (MIC2941A)
  • Available in TO-220, TO-263, TO-220-5, and TO-263-5 packages.
Parameter
Parameter Name Value Value
Product Type Single LDOs Single LDOs
# of Out 1 1
IOUT #1
IOUT #2
IOUT #3
IOUT #4
IOUT (mA) 1250 1250
VIN Min (V) 2 2
VIN Max (V) 26 26
VOUT (V) 3.3, 5.0, 12 3.3, 5.0, 12
Voltage Drop Typ (mV) 400 400
IGND Typ (µA) 3 3
Tol Typ % ±1 ±1
Noise (µV) rms 260 260
Soft Start Pin
Load Dump Yes Yes
Rev Bat Yes Yes
Reverse Current Protect Yes Yes
Documents
MIC2940A/2941A - 1.2A Low-Dropout Voltage RegulatorData Sheets11/09/2015324KB
Micrel AN 12 - Design Considerations for 5V to 3.3V Pass RegulatorsAppNote10/01/201528KB
Micrel AN 43 - Improving Adjustable Regulator AccuracyAppNote10/01/201559KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC2940A-12WT3TO-220-40C to +125CTUBE2.371.981.801.501.38
MIC2940A-12WU3TO-263-40C to +125CTUBE2.271.891.721.431.32
MIC2940A-12WU-TR3TO-263-40C to +125CT/R2.271.891.721.431.32
MIC2940A-3.3WT3TO-220-40C to +125CTUBE2.141.781.621.351.25
MIC2940A-3.3WU3TO-263-40C to +125CTUBE1.981.651.501.251.15
MIC2940A-3.3WU-TR3TO-263-40C to +125CT/R1.981.651.501.251.15
MIC2940A-5.0WT3TO-220-40C to +125CTUBE2.371.981.801.501.38
MIC2940A-5.0WU3TO-263-40C to +125CTUBE1.981.651.501.251.15
MIC2940A-5.0WU-TR3TO-263-40C to +125CT/R1.981.651.501.251.15
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2940A-12WT1.8902002.6600003TO-220-Matte Tine3
MIC2940A-3.3WT1.8902002.6600003TO-220-Matte Tine3
MIC2940A-5.0WT1.8902002.6600003TO-220-Matte Tine3
MIC2940A-5.0WU1.5110002.3600003TO-263-Matte Tine3
MIC2940A-5.0WU-TR1.5110002.5066673TO-263-Matte Tine3
MIC2940A-12WU1.5110002.3600003TO-263-Matte Tine3
MIC2940A-12WU-TR1.5110002.5066673TO-263-Matte Tine3
MIC2940A-3.3WU1.5110002.3600003TO-263-Matte Tine3
MIC2940A-3.3WU-TR1.5110002.5066673TO-263-Matte Tine3
MIC2940A/2941A - 1.2A Low-Dropout Voltage Regulator MIC2941A
Micrel AN 12 MIC2951
Micrel AN 43 MIC29752