LED controller supports buck, boost and buck-boost

15th May 2023
Mick Elliott

The MPQ2484U is a flexible, multi-topology, asynchronous controller from MPS for LED lights requiring high luminous output.

It is available at distributor Digi-Key.

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 (VIN) range and a maximum boost output voltage of up to 75 V. Peak current mode provides a fast transient response and simplifies loop stabilization.

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 utilising 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.

Features include integrated P-channel MOSFET driver for switch dimming, and one or multiple LED short protection.

The device is available in a TSSOP-28EP package

Applications are automotive exterior LED lighting including headlights, rear lights and fog lights and commercial and industrial LED lighting.

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