Monolithic Power Systems — MPQ4488B-AEC1 Step-Down Converter

The automotive-grade MPQ4488B from Monolithic Power Systems is an integrated power regulator for USB charging ports.

The device combines a monolithic, step-down, switch-mode converter with two USB current-limit switches, as well as charging port identification circuitry for each of two USB ports. The MPQ4488B can supply up to 6 A of output current across a wide input-voltage range of 6 V to 36 V, while maintaining excellent load and line regulation.

The MPQ4488B requires a small number of readily available, standard external components, and is supplied in a 5 mm x 5 mm QFN-26 package. The MPQ4488BGU-FD-AEC1 version of the product includes frequency spread-spectrum capability to help OEMs to comply with strict EMC requirements.

Each USB switch output is current-limited. Both USB ports support dedicated charging port (DCP) schemes for various battery charging specifications, including BC1.2, Apple 3A Divider mode, 1.2V/1.2V mode, and USB Type-C for 5 V operation at 3 A in DFP mode. This eliminates the need for outside user interaction to initiate charging operations.

A full set of protection features includes:

• Current limiting with hiccup mode
• Output over-voltage protection

Thermal shutdown