The HTC34063A is a low-power BiCMOS current-mode PWM controller that can operate at up to 100 kHz switching frequency. It is designed to control step-up, step-down, and voltage-inverting applications. This controller has an error amplifier, a 5.0 V reference, a current sense comparator, and a high-current output switch integrated on a single chip. The HTC34063A is housed in a standard 8-pin DIP package and is widely used in various electronic circuits such as DC-DC converters, battery chargers, and LED drivers. Despite its low popularity and limited supply, this controller offers a cost-effective solution for low-power applications.