Microchip Technology, Inc. DC DC Switching Controllers MIC38HC43BN

The MIC38HC43BN is a fixed frequency current-mode PWM controller designed for high efficiency in DC-DC conversion applications. 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 start-up current of 50¬µA and a typical operating current of 4mA, making it suitable for low-power applications. It supports a wide input voltage range, starting at 8.4V and operating down to 7.6V, with a maximum operating voltage of 20V. This controller is pin-compatible with UC384x bipolar devices, allowing for easy integration into existing designs. It offers fast output rise and fall times of 20ns and 15ns, respectively, which enhances its ability to drive larger MOSFETs efficiently. The MIC38HC43BN is suitable for various applications, including step-down (buck) and step-up (boost) converters, as well as flyback and forward converters. Its features, such as undervoltage lockout with hysteresis and rail-to-rail output capability, further enhance its performance in power supply designs.