Microchip Technology, Inc. PMIC - PMIC - AC DC Converters, Offline Switchers - MIC38HC44-1BN MIC38HC44-1BN

The MIC38HC44-1BN is a fixed frequency current-mode PWM controller designed for high efficiency in offline switched-mode power supplies. It features a peak output drive current of 1A and operates within a temperature range of -40¬8C to +85¬8C. The device has a low startup current of 50¬µA and a low operating current of 4mA, making it suitable for applications requiring energy efficiency. This controller supports a maximum duty cycle of 50% and can operate with input voltages from 9V to 20V, with an undervoltage lockout (UVLO) threshold for startup at 14.5V. The MIC38HC44-1BN is pin-compatible with UC3844 devices, allowing for easy integration into existing designs. It is available in a 14-pin plastic DIP package, which separates analog and power connections to enhance performance and power dissipation. Applications for this product include step-down (buck) and step-up (boost) regulators, as well as flyback and forward converters. The device's fast output rise and fall times (20ns and 15ns, respectively) enable it to drive larger MOSFETs effectively, contributing to improved overall efficiency.