Microchip Technology, Inc. Voltage Regulators - Linear + Switching TC1303B-PD0EMF

The TC1303B-PD0EMF is a dual-output voltage regulator that combines a 500 mA synchronous buck regulator and a 300 mA low-dropout regulator (LDO). It features a power-good output with a 300 ms delay, making it suitable for applications requiring voltage monitoring. The device operates with a total quiescent current of 65 µA and includes independent shutdown capabilities for both outputs. The synchronous buck regulator achieves over 90% efficiency at a fixed frequency of 2.0 MHz under heavy load, while transitioning to pulse frequency modulation (PFM) mode during light load conditions to reduce power consumption. The buck output voltage is adjustable from 0.8V to 4.5V, with standard fixed output options available. The LDO has a typical dropout voltage of 137 mV at 200 mA and offers standard fixed output voltages of 1.5V, 1.8V, 2.5V, and 3.3V. Protection features include undervoltage lockout, output short circuit protection, and overtemperature protection. The TC1303B-PD0EMF is available in a compact 10-pin DFN or MSOP package, making it suitable for space-constrained applications such as portable computers, USB-powered devices, and handheld medical instruments.