MPQ2484 75 V Buck-Boost LED Controller

MPS' MPQ2484U is a flexible, multi-topology, asynchronous controller for LED lights requiring high luminous output. The device supports buck, boost, and buck-boost configurations, which makes it suitable for a wide range of LED lighting applications.

The MPQ2484U features a wide 4.5 V to 45 V input voltage (V_IN) range and a maximum boost output voltage of up to 75 V. Peak current mode provides a fast transient response and simplifies loop stabilization. The switching frequency (fSW) can be set via the FSET pin, or it can be synchronized with a 100 kHz to 2.2 MHz external clock signal. The configurable frequency spread spectrum (FSS) function can periodically enable frequency dithering to improve EMI. The MPQ2484U provides switch-mode dimming by utilizing an external P-channel MOSFET. Without a P-channel MOSFET, two-step dimming or pulse-width modulation (PWM) dimming can be selected.

Robust fault protections include thermal shutdown, cycle-by-cycle peak current limiting, output overvoltage protection (OVP), output short-circuit protection (SCP), LED open protection, and LED short protection. A fault indicator outputs an active logic low signal if a fault occurs.