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

Overview

MPQ24833-BGN-AEC1-Z 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–55V input, delivers precise 0.2V current-sense reference, and enables combined DC/PWM dimming via a single EN/DIM pin - used in automotive headlamp modules requiring robust open-string and short-circuit protection.

For engineers reviewing the MPQ24833-BGN-AEC1-Z datasheet, MPQ24833-BGN-AEC1-Z pinout, MPQ24833-BGN-AEC1-Z application, or MPQ24833-BGN-AEC1-Z equivalent, key selection considerations include its dual-mode topology flexibility, AEC-Q100 Grade 1 qualification, integrated OVP/SCP/open-string protection, SOIC-8 EP thermal performance (θJA = 42°C/W on EVB), and single-pin analog+PWM dimming interface.

Technical Context

The MPQ24833-BGN-AEC1-Z implements current-mode control with fixed 420kHz switching frequency and slope compensation for stable loop response across wide duty cycles (up to 97%). Its functional block includes a 0.2V precision error amplifier reference, 2.43V OVP comparator, and cycle-by-cycle peak current limiting tied to internal 0.15Ω MOSFET conduction.

It supports three distinct topologies via external component configuration: step-down (buck) for V_IN > V_LED, inverting step-up/step-down (buck-boost) for V_IN < V_LED, and step-up (boost) with external diode placement - all using the same SOIC-8 EP package and shared EN/DIM, FB, OVP, and BST pins.

Key Specifications

Pinout & Package

MPQ24833-BGN-AEC1-Z is housed in an SOIC-8 EP (exposed pad) package. The exposed pad must be soldered to a thermal pad on PCB for optimal junction-to-board heat transfer and reliability in automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24833-AEC1-Z, the MPQ24833-BGN-AEC1-Z adds Grade 1 qualification and tighter OVP tolerance; versus LM3409QMYX/NOPB, it integrates the power switch and lowers sense loss by 84%, reducing total solution size and thermal footprint.

Availability

MPQ24833-BGN-AEC1-Z is available at Aetrix Electronics and suitable for automotive lighting, LCD backlighting, and industrial signage requiring stable component supply with AEC-Q100 compliance, high-current capability, and multipurpose topology support.

Supply support for MPQ24833-BGN-AEC1-Z 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.

The MPQ24833-B product line targets automotive-grade LED illumination systems requiring robust fault protection, wide input range, and topology flexibility - designed specifically for front lighting, DRLs, and adaptive beam applications.

FAQ

What topologies does MPQ24833-BGN-AEC1-Z support, and how are they configured?

The MPQ24833-BGN-AEC1-Z supports buck, boost, and buck-boost topologies through external component placement - no internal configuration bits. Buck uses standard inductor-diode layout; boost places diode between SW and output; buck-boost uses inverting configuration with diode between SW and ground. All share identical pinout and control logic.

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

The EN/DIM pin accepts a 100Hz–2kHz square wave with amplitude between 0.75V and 1.5V (referenced to INGND). Within this range, the duty cycle sets average LED current while the waveform envelope preserves analog linearity - enabling smooth, low-flicker dimming without separate control lines or external logic.

What is the purpose of the separate INGND pin, and why can't it be tied to VSS?

INGND serves as the reference for EN/DIM voltage levels and isolates digital control signals from high-current power return paths. Tying INGND to VSS introduces ground bounce from switching currents, causing false enable/disable or dimming nonlinearity - MPS specifies ≤10mV potential difference between INGND and VSS for guaranteed operation.

Can MPQ24833-BGN-AEC1-Z drive LEDs with forward voltage exceeding input voltage in buck mode?

No - in buck mode, V_LED must be less than V_IN. For V_LED > V_IN, the device must be configured in boost or buck-boost topology. The datasheet confirms buck operation is valid only when input exceeds LED string voltage; attempting otherwise results in regulation loss and OVP fault triggering.

What is the minimum recommended output capacitance, and why is ceramic preferred?

MPS specifies ≥2.2µF X7R ceramic capacitor for most buck applications. Ceramic is required due to its low ESR (<10mΩ), stable capacitance over temperature/voltage, and ability to handle high ripple current without derating - electrolytic or tantalum types introduce instability and reduce phase margin in the current-mode control loop.

How does open-string protection operate, and what external components are needed?

Open-string protection uses the OVP pin: a resistor divider from LED+ to VSS sets threshold at 2.43V. When LED opens, FB drops near 0V, forcing maximum duty cycle until OVP voltage reaches threshold, then shuts off SW. No additional ICs are needed - only two resistors (e.g., 100kΩ + 10.2kΩ) forming the divider.

Is the SOIC-8 EP package lead (Pb)-free and RoHS-compliant?

Yes - MPQ24833-BGN-AEC1-Z is fully lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status on its Quality Assurance webpage, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 requirements for surface-mount assembly.