MIC38HC42

The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel's BiCMOS devices are pin-compatible with 384x bipolar devices. Their high output drive, with fast rise and fall times, combined with low startup current make it an ideal PWM controller where high efficiency is required. Undervoltage lockout circuitry allows the '42 and '44 versions to start up at 14.5V and operate down to 9V, and the '43 and '45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V. When compared to bipolar UC384x devices operating from a 15V supply, start-up current has been reduced to 50µA typical and operating current has been reduced to 4.0 mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lower supply voltages. The MIC38HC4x also features a trimmed oscillator discharge current and bandgap reference. MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC packages. 8-pin devices feature small size, while 14-pin devices separate the analog and power connections for improved performance and power dissipation.

Features
  • Fast 20ns output rise and 15ns output fall times
  • -40°C to +85°C temperature range exceeds UC284x specifications
  • High-performance, low-power BiCMOS Process
  • Ultra-low start-up current (50µA typical)
  • Low operating current (4mA typical)
  • High output drive (1A peak current, HC version)
  • CMOS outputs with rail-to-rail swing
  • Current-mode operation up to 500kHz
  • Trimmed 5V bandgap reference
  • Pin-for-pin compatible with UC3842/3843/3844/3845(A)
  • Trimmed oscillator discharge current
  • UVLO with hysteresis
  • Low cross-conduction currents
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) 20 20
Typical Tolerance (%) ±2 ±2
Duty Cycle Max (%) 0.96 0.96
Operating Frequency (Hz) Adj. to 500kHz Adj. to 500kHz
Internal Voltage Bias True True
Input UVLO Typ (V) 14.5 14.5
Operating Supply Current (mA) 4 4
Package 8/PDIP, 8/SOIC, 14/PDIP, 14/SOIC 8/PDIP, 8/SOIC, 14/PDIP, 14/SOIC
Documents
MIC38HC42/3/4/5 -BiCMOS 1A Current-Mode PWM ControllersData Sheets11/09/201580KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC38HC42YM8SOIC-40C to +85CTUBE2.061.711.561.301.20
MIC38HC42YM-TR8SOIC-40C to +85CT/R2.061.711.561.301.20
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC38HC42-1YN0.9533001.83333314PDIP.300inMatte Tine3
MIC38HC42YN0.4867000.9000008PDIP.300inMatte Tine3
MIC38HC42-1YM0.1432000.28070214SOIC.150In(3.90mm)Matte Tine3
MIC38HC42-1YM-TR0.1432000.32500014SOIC.150In(3.90mm)Matte Tine3
MIC38HC42YM0.0750000.1632658SOIC3.90mm(.150in)NiPdAue4
MIC38HC42YM-TR0.0750000.2500008SOIC3.90mm(.150in)NiPdAue4
MIC38HC42/3/4/5 -BiCMOS 1A Current-Mode PWM Controllers MIC38HC45
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