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Datasheet Microchip MIC38HC45-1YM

Part NumberMIC38HC45-1YM

The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability


  • Download » Datasheet PDF, 83 Kb, Revision: 11-09-2015
    MIC38HC42/3/4/5 -BiCMOS 1A Current-Mode PWM Controllers
    Docket ↓
    MIC38HC42/3/4/5 Micrel, Inc. MIC38HC42/3/4/5
    BiCMOS 1A Current-Mode PWM Controllers General Description Features 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 50ВµA
    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. 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 Ultralow start-up current (50ВµA 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 Applications Current-mode, off-line, switched-mode power supplies
    Current-mode, dc-to-dc converters. ...



Lifecycle StatusProduction (Appropriate for new designs but newer alternatives may exist)




Duty Cycle Max0.5 %
Input UVLO Typ8.4 V
Internal Voltage BiasTrue
Maximum Input Voltage20 V
Minimum Input Voltage7.6 V
Operating FrequencyAdj. to 500kHz Hz
Operating Supply Current4 mA
Operating Temperature Range-40 to +85 °C
Supported Outputs1
Supported TopologiesForward,Flyback
Typical ToleranceВ±2 %

Eco Plan


Other Options


Moldel Line

Series: MIC38HC45 (6)

Manufacturer's Classification

  • Power Management > PWM Controllers > Flyback/Fwd/Push-Pull Products

Other Names:


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