Microchip | MIC38C44-1YM

The MIC38C44-1YM is a BiCMOS, fixed frequency, high performance, current-mode PWM controller with a maximum duty cycle of 50%. Available in surface mount SOIC-14 package.

This device is pin compatible with 384x bipolar devices but feature several improvements. The undervoltage lockout circuitry allows the MIC38C44 to start up at 14.5 V and operate down to 9 V.

Features:

• 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 (50 μA typical)
• Low operating current (4 mA typical)
• CMOS outputs with rail-to-rail swing
• ≥ 500 kHz current-mode operation
• Trimmed 5 V 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
• Forward converters
• Synchronous FET converters