Monolithic Power Systems Inc. MPQ24833-BGN-AEC1-P

Overview

MPQ24833-BGN-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified 55V, 3A LED driver IC supporting buck, boost, and buck-boost topologies. It integrates a 0.15Ω internal MOSFET, operates from 4.5V to 55V input, delivers precise 0.2V current-sense reference, and enables combined DC/PWM dimming via a single EN/DIM pin for automotive lighting systems.

For engineers reviewing the MPQ24833-BGN-AEC1-P datasheet, MPQ24833-BGN-AEC1-P pinout, MPQ24833-BGN-AEC1-P application in automotive LED headlamps or LCD backlighting, or MPQ24833-BGN-AEC1-P equivalent for high-voltage LED drivers with integrated OVP and SCP, this page provides verified topology flexibility, thermal shutdown behavior, dimming linearity range, and SOIC-8 EP package layout guidance.

Technical Context

The MPQ24833-BGN-AEC1-P uses current-mode control with fixed 420kHz switching frequency and slope compensation to ensure stable operation across buck, boost, and buck-boost configurations. Its error amplifier regulates LED current by comparing FB voltage against a 0.2V internal reference, while the OVP pin monitors output overvoltage via external resistor divider with 2.43V threshold.

Dimming is implemented through EN/DIM pin: analog dimming responds linearly between 0.75V–1.5V (0–100% I_LED), PWM dimming accepts 100Hz–2kHz signals ≥1.7V, and combined mode uses 0.75V–1.5V PWM amplitude. Output short-circuit protection triggers frequency foldback when OVP < 0.2V and FB < 0.1V.

Key Specifications

Pinout & Package

MPQ24833-BGN-AEC1-P is housed in an SOIC-8 EP (exposed pad) package, where the exposed thermal pad is electrically connected to VSS and must be soldered to a PCB copper pour for thermal management and noise immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with MPQ24833-BGN-Z and MPQ24833-BGN, the MPQ24833-BGN-AEC1-P uniquely combines AEC-Q100 Grade 1 qualification, 125°C max junction temperature, and production traceability - making it the sole choice for OEM automotive lighting modules requiring PPAP documentation and zero-defect reliability.

Availability

MPQ24833-BGN-AEC1-P is available at Aetrix Electronics and suitable for automotive headlamps, LCD backlight panels, commercial vehicle tail lights, and industrial control panel indicators requiring stable component supply across extended temperature ranges and rigorous qualification standards.

Supply support for MPQ24833-BGN-AEC1-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with core expertise in DC/DC converters, LED drivers, and motor drivers for automotive, industrial, and consumer markets.

The MPQ24833 product line delivers multi-topology LED drivers optimized for automotive-grade reliability, featuring integrated power switches, comprehensive protection, and single-pin dimming - targeting headlamp, taillight, and interior lighting systems demanding AEC-Q100 compliance.

FAQ

What is the minimum number of LEDs supported by MPQ24833-BGN-AEC1-P?

The MPQ24833-BGN-AEC1-P requires no minimum number of LEDs - it operates stably with a single LED or open-circuit condition due to its open-string protection architecture. The OVP pin detects missing LED strings and disables switching before overvoltage occurs, enabling flexible design across diverse lighting configurations.

How does the EN/DIM pin implement combined analog and PWM dimming?

Combined dimming is achieved by applying a 100Hz–2kHz PWM signal with amplitude between 0.75V and 1.5V to EN/DIM. The IC interprets the duty cycle of this signal as the brightness level while preserving analog linearity - for example, a 50% duty cycle at 1.0V produces 50% LED current, independent of PWM frequency within spec.

What is the recommended layout practice for the VSS exposed pad?

The VSS exposed pad must be soldered to a solid copper pour connected directly to the main power ground plane using ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart). This minimizes ground impedance, reduces switching noise coupling into FB and EN/DIM, and maintains thermal resistance below 10°C/W to sustain 3A operation at 125°C ambient.

Does MPQ24833-BGN-AEC1-P support synchronous rectification?

No - MPQ24833-BGN-AEC1-P uses an internal N-channel MOSFET for the high-side switch and requires an external Schottky diode for the low-side path in buck and buck-boost topologies. It does not integrate a synchronous rectifier driver or support external MOSFET gate control for the return path.

What happens during output short-circuit to VSS in buck-boost mode?

When LED+ shorts to VSS in buck-boost mode, OVP voltage drops below 0.2V and FB falls below 0.1V. The IC enters frequency foldback mode, reducing switching frequency to ~120kHz to limit power dissipation. Recovery occurs automatically once the short is removed and OVP rises above 0.2V with FB > 0.1V.

Can MPQ24833-BGN-AEC1-P drive LEDs with forward voltage exceeding input voltage?

Yes - in boost or buck-boost topology, the MPQ24833-BGN-AEC1-P can regulate LED current even when V_LED > V_IN, such as driving a 21V LED string from a 12V supply. Efficiency remains >85% at 1A output in this configuration, as confirmed by buck-boost efficiency curves in the datasheet.

Is the 0.2V FB reference affected by temperature?

The 0.2V reference exhibits ±5% variation over −40°C to +125°C, with typical drift of ±15mV across temperature. This is specified in the Electrical Characteristics table and does not require external calibration - the tolerance is factored into LED current accuracy calculations (e.g., 3A ±150mA at extremes).