MIC9131

The MIC9131 is a current-mode PWM controller that efficiently converts -48V telecom voltages to logic levels. The MIC9131 features a high voltage start-up circuit that allows the device to be connected to input voltages as high as 180V. The high input voltage capability protects the MIC9131 from line transients that are common in telecom systems. The start-up circuitry also saves valuable board space and simplifies designs by integrating several external components. The MIC9131 is capable of high speed operation. Typically the MIC9131 can control a sub-25ns pulse width on the gate out pin. Its internal oscillator can operate over 2.5MHz, with even higher frequencies available through synchronisation. The high speed operation of the MIC9131 is made safe by the very fast, 34ns response from current sense to output, minimizing power dissipation in a fault condition. The MIC9131 allows for the designs of high efficiency power supplies. It can achieve efficiencies over 90% at high output currents. Its low 1.3mA quiescent current allows high efficiency even at light loads. The MIC9131 has a maximum duty cycle of 75%. For designs requiring a maximum duty cycle of 50%, refer to the MIC9130. The MIC9131 is available in a 16-pin SOP and 16-pin QSOP package options. The junction temperature range is from -40°C to +125°C.

Features
  • Input voltages up to 180V
  • Internal oscillator capable of >2.5MHz operation
  • Accurate 75% maximum duty cycle
  • Synchronisation capability to 6MHz
  • Current sense delay of 34ns
  • Minimum pulse width of <25ns
  • 90% efficiency
  • 1.3mA quiescent current
  • 1µA shutdown current
  • Soft-start
  • Resistor programmable current sense threshold
  • Selectable soft-start retry
  • 4Ω sink, 12Ω source output driver
  • Programmable under-voltage lockout
  • Constant-frequency PWM current-mode control
  • 16-pin SOIC and 16-pin QSOP
Parameter
Parameter Name Value Value
Supported Topologies Forward,Flyback Forward,Flyback
Supported Outputs 1 1
Minimum Input Voltage (V) 9 9
Maximum Input Voltage (V) 180 180
Minimum Output Voltage (V) 4.85 4.85
Maximum Output Voltage (V) 4.85 4.85
Typical Tolerance (%) ±3 ±3
Duty Cycle Max (%) 0.75 0.75
Operating Frequency (Hz) Adj. to 2.5MHz Adj. to 2.5MHz
External Clock Sync True True
Soft Start True True
Internal Voltage Bias True True
Enable Pin True True
Current Limit / Short Circuit Protection True True
Input UVLO Typ (V) 1.22 1.22
Operating Supply Current (mA) 1 1
Iq Off (µA) 0.1 0.1
Package 16/SOP, 16/QSOP 16/SOP, 16/QSOP
Documents
MIC9131 Data SheetData Sheets11/09/2015910KB
MIC9131 1/4 Brick Evaluation BoardUser Guides11/11/2015298KB
MIC9131 Evaluation BoardUser Guides11/11/2015130KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC9131YM16SOIC-40C to +125CTUBE3.372.812.552.472.44
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC9131YM0.1574000.30000016SOIC.150inMatte Tine3
MIC9131YM-TR0.1574000.30769216SOIC.150inMatte Tine3
MIC9131YQS0.0836000.16000016QSOP3.90mm(.150in)Matte Tine3
MIC9131YQS-TR0.0836000.32000016QSOP3.90mm(.150in)Matte Tine3
MIC9131 Data Sheet MIC9131
MIC9131 1/4 Brick Evaluation Board MIC9131
MIC9131 Evaluation Board MIC9131