Electronics ru
Advanced Search +

Datasheet Microchip MIC38C45AYM

Part NumberMIC38C45AYM

The MIC38C4x are fixed frequency, high performance, current-mode PWM controllers


  • Download » Datasheet PDF, 351 Kb, Revision: 11-09-2015
    MIC38C42/3/4/5 - BiCMOS Current-Mode PWM Controllers
    Docket ↓
    MIC38C42/3/4/5 Micrel, Inc. MIC38C42/3/4/5
    BiCMOS Current-Mode PWM Controllers General Description Features The MIC38C4x are fixed frequency, high performance, current-mode PWM controllers. Micrel’s BiCMOS devices are
    pin compatible with 384x bipolar devices but feature several
    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 384x 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 MIC38C4x also features
    a trimmed oscillator discharge current and bandgap reference.
    The MIC38C4x denotes 8-pin plastic DIP, SOIC, and MSOP
    packages. MIC384Cx-1 denotes 14-pin plastic DIP and
    SOIC packages. 8-pin devices feature small size, while 14pin devices separate the analog and power connections for
    improved perfomance and power dissipation. Fast 40ns output rise and 30ns output fall times –40°C to +85°C temperature range
    meets UC284x specifications High-performance, low-power BiCMOS Process Ultralow start-up current (50µA typical) Low operating current (4mA typical) CMOS outputs with rail-to-rail swing ≥ 500kHz current-mode operation 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.
    Step-down “buck” regulators
    Step-up “boost” regulators
    Flyback, isolated regulators ...



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

MIC38C42 MIC38C43 MIC38C44

Moldel Line

Series: MIC38C45 (11)

Manufacturer's Classification

  • Power Management > PWM Controllers > Flyback/Fwd/Push-Pull Products
Slices ↓
Radiolocman facebook Radiolocman twitter Radiolocman google plus