Description

The MCP1781 is a high-voltage, Low Drop-Out (LDO) regulator, capable of supplying 200 mA of output current. The input voltage range of 4.0V to 55V makes it suitable for 12V to 48V power rails, such as those found in high-voltage battery packs, or automotive applications where it can maintain regulation through large transients, including load dump events.

A low UVLO of 2.3V makes it adequate for cold cranking conditions in automotive applications.

The MCP1781 offers two standard fixed output voltage versions, 3.3V and 5.0V, and an adjustable output option, with a voltage range from 1.3V to 5V. The regulator output is stable with a 3.3 µF ceramic capacitor. The device is protected from short-circuit events by the current foldback function and from overheating by means of thermal shutdown protection.

Two 5-lead packages are available, SOT-223 and TO-252, both with a PWG/ADJ pin (PWG for the fixed version and ADJ for the adjustable version) and a SHDN pin. While in shutdown, the quiescent current drops to 3.5 µA, allowing for lower overall power consumption. The device itself has a ground current of 85 µA (typical) when delivering maximum output current of 200 mA.