Microchip Technology, Inc. Voltage Regulators - Linear + Switching TC1303B-DF0EMF

The TC1303B-DF0EMF is a dual-output voltage regulator that combines a 500 mA synchronous buck regulator and a 300 mA low-dropout (LDO) regulator. It features a power-good output with a 300 ms delay, allowing for monitoring of the LDO output. The device operates with a total quiescent current of 65 ¬µA and includes independent shutdown controls for both outputs. The synchronous buck regulator achieves over 90% efficiency at a fixed frequency of 2.0 MHz under heavy load and transitions to pulse frequency modulation (PFM) mode at lighter loads to conserve power. The LDO has a typical dropout voltage of 137 mV at 200 mA and supports standard fixed output voltages of 1.5V, 1.8V, 2.5V, and 3.3V. The TC1303B is available in a compact 10-pin DFN or MSOP package and operates over a junction temperature range of -40¬8C to +125¬8C. Additional protection features include undervoltage lockout, output short circuit protection, and overtemperature protection, making it suitable for applications in cellular phones, portable computers, USB-powered devices, and handheld medical instruments.