Monolithic Power Systems Inc. MP24833-AGN

Overview

MP24833-AGN from Monolithic Power Systems is a 55V, 3A white LED driver IC supporting buck, boost, and buck-boost topologies. It integrates a 0.15Ω internal MOSFET, operates at fixed 210kHz switching frequency, delivers 0.2V reference-based current regulation, and enables combined analog/PWM dimming via a single EN/DIM pin - used in automotive interior lighting with 7-series LED strings at 1A output.

For engineers reviewing the MP24833-AGN datasheet, MP24833-AGN pinout, MP24833-AGN application, or MP24833-AGN equivalent, key selection criteria include its 4.5V–55V input range, open-string and short-circuit protection, SOIC-8 EP thermal performance (θJA = 50°C/W), and dual-dimming control architecture requiring no minimum LED count.

Technical Context

The MP24833-AGN employs peak current-mode control with slope compensation for stable operation across wide duty cycles (up to 97%). Its error amplifier regulates LED current by comparing FB voltage against a precise 0.2V internal reference, while the OVP pin monitors output voltage via external resistor divider to trigger shutdown at 2.43V threshold.

It supports three distinct DC-DC configurations: step-down (buck) with VIN ≥ VLED, step-up (boost) with VIN ≤ VLED, and inverting buck-boost where output polarity is reversed. The bootstrap (BST) circuit sustains high-side gate drive, and INGND provides isolated reference for EN/DIM dimming signals independent of power ground.

Key Specifications

Pinout & Package

MP24833-AGN is housed in a thermally enhanced SOIC-8 EP package with exposed VSS pad for improved heat dissipation (θJC = 10°C/W). The 8-pin layout supports high-current routing and noise-sensitive analog feedback separation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24833-A-GN-AEC1, the MP24833-AGN lacks automotive qualification but offers identical performance at lower cost; versus LT3466-1EDD, it delivers 2.3× more output current with integrated FET and wider input range, reducing BOM count and layout complexity.

Availability

MP24833-AGN is available at Aetrix Electronics and suitable for automotive interior lighting, LCD backlight panels, and portable GPS devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP24833-AGN 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 analog and power ICs, with core expertise in DC-DC conversion, LED drivers, and motor control solutions.

The MP24833 product line targets high-reliability, wide-input LED lighting applications - designed specifically for automotive, industrial, and portable systems demanding robust protection, flexible topology support, and minimal external components.

FAQ

What topologies does the MP24833-AGN support?

The MP24833-AGN supports buck (step-down), boost (step-up), and inverting buck-boost configurations. Its unique architecture allows seamless transition between modes based on input-output voltage relationship - no reconfiguration or external switches required. This is enabled by internal current-mode control, dedicated OVP monitoring, and isolated INGND reference for flexible grounding schemes.

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

The EN/DIM pin accepts either a DC voltage (0.67–1.35V) for linear analog dimming or a 100Hz–2kHz square wave (>1.5V amplitude) for PWM dimming. For combined control, a PWM signal with amplitude between 0.67V and 1.35V modulates average LED current while preserving dimming resolution. The internal circuitry interprets voltage level and edge timing independently to avoid interference.

What is the purpose of the INGND pin?

INGND serves as the dedicated reference ground for the EN/DIM signal, electrically isolated from power ground (VSS). This allows direct connection of positive-control logic (e.g., MCU GPIO) to EN/DIM without level-shifting, even when the LED string is referenced to negative voltage - essential for buck-boost and boost configurations where LED cathode is not at system ground.

Can the MP24833-AGN operate with only one LED in the string?

Yes. Unlike many LED drivers requiring minimum forward voltage, the MP24833-AGN imposes no minimum LED count. Its current regulation loop functions correctly with zero or one LED due to the 0.2V FB reference and adaptive OVP thresholding - enabling design flexibility for single-LED indicators or partial-string redundancy in multi-string arrays.

What thermal considerations apply to the SOIC-8 EP package?

The SOIC-8 EP package features an exposed VSS pad that must be soldered to a minimum 100mm² copper pour for effective heat transfer. With θJA = 50°C/W and θJC = 10°C/W, junction temperature rise is minimized under 3A load. Layout guidelines require short, wide traces for VDD, SW, and VSS; the exposed pad must connect directly to inner-layer ground planes via ≥4 thermal vias (0.3mm diameter) for optimal thermal performance.

How does open-string protection work without a dedicated sense line?

Open-string protection uses the OVP pin in conjunction with the FB node. When an LED opens, FB voltage drops near 0V, causing the controller to increase duty cycle until the OVP voltage - derived from output voltage via external resistor divider - reaches 2.43V. At that point, the switch disables and remains off until OVP falls below hysteresis threshold (2.35V), preventing uncontrolled voltage rise and component stress.