Monolithic Power Systems Inc. MP24833-AGN-P

Overview

MP24833-AGN-P from Monolithic Power Systems is a 55V, 3A white LED driver IC supporting buck, boost, and buck-boost topologies with integrated 0.15Ω MOSFET, 210kHz fixed-frequency current-mode control, 0.2V feedback reference, and combined DC/PWM dimming on a single EN/DIM pin. It delivers stable LED current in LCD backlight panels and automotive interior lighting where wide input range (4.5–55V) and robust protection are required.

For engineers reviewing the MP24833-AGN-P datasheet, MP24833-AGN-P pinout, MP24833-AGN-P application, or MP24833-AGN-P equivalent, key selection considerations include its unique buck-boost capability, open-string and short-circuit protection, thermal shutdown with 15°C hysteresis, SOIC-8 EP thermal performance (θJA = 50°C/W), and dual-dimming interface referenced to INGND.

Technical Context

The MP24833-AGN-P implements peak current-mode control with slope compensation, enabling fast transient response and simplified loop stability across all three operating modes. Its error amplifier integrates the difference between FB voltage and 0.2V reference to regulate peak inductor current, directly setting LED current via external sense resistor.

It features a dedicated OVP pin for programmable overvoltage protection (2.43V threshold), separate INGND reference for isolated enable/dimming control, and foldback frequency (37kHz) during output short-circuit events. The bootstrap (BST) circuit supplies gate drive for the internal high-side switch, requiring a ≥100nF ceramic capacitor between BST and SW.

Key Specifications

Pinout & Package

MP24833-AGN-P is housed in a thermally enhanced SOIC-8 EP package with exposed VSS pad for improved heat dissipation (θJC = 10°C/W). The package meets JEDEC MS-012 BA standard and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP24833-AGN-P, the MPQ24833-A-GN-Z adds automotive qualification without sacrificing performance, while the LT3466-1EDD#PBF trades integration for higher frequency and lower current - making MP24833-AGN-P optimal for cost-sensitive, thermally constrained 3A LED systems needing topology flexibility.

Availability

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

Supply support for MP24833-AGN-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP24833 product line targets high-current LED lighting applications demanding wide input range, multi-topology flexibility, and integrated protection - optimized for space-constrained, thermally sensitive systems in automotive and industrial displays.

FAQ

What topologies does MP24833-AGN-P support, and how is mode selection implemented?

The MP24833-AGN-P natively supports buck, boost, and buck-boost configurations through external component selection - no mode pins or register programming required. Topology is determined solely by circuit layout: buck uses inductor between VIN and SW, boost places inductor between VIN and VDD, and buck-boost uses inductor between SW and ground. All share identical IC control logic and protection features.

How does the EN/DIM pin handle simultaneous analog and PWM dimming?

The EN/DIM pin accepts a 100Hz–2kHz square wave with amplitude between 0.67V and 1.35V (referenced to INGND) to combine both dimming methods. Within this range, the duty cycle of the PWM signal sets brightness percentage, while the DC offset fine-tunes the effective dimming curve - enabling smooth 0.1%–100% control without external logic.

What is the purpose of the separate INGND pin, and how should it be routed?

INGND provides an isolated reference for the EN/DIM control signal, decoupling dimming logic from high-current LED return paths. It must connect directly to the system's input ground plane - never to VSS or LED cathode - and be routed away from noisy SW or inductor traces to prevent false triggering or dimming instability.

Can MP24833-AGN-P drive LEDs without a minimum string voltage requirement?

Yes - the IC imposes no minimum LED forward voltage. It operates down to 0V output (e.g., single LED with ~3V V_F) in buck mode and maintains regulation via current-mode control. This eliminates need for dummy loads or Zener clamps in low-V_F or variable-string-count designs.

What thermal design guidance applies to the SOIC-8 EP package?

The exposed VSS pad must be soldered to ≥200mm² of 2oz copper on the PCB's inner or bottom layer, connected via ≥4 thermal vias (0.3mm diameter) to internal ground planes. With this layout, the IC sustains 3A continuous output at +85°C ambient; derating to 2.5A is recommended above +100°C case temperature.

How does open-string protection interact with the OVP pin in buck-boost applications?

In buck-boost mode, an open LED causes OVP voltage to rise until it reaches 2.43V, triggering shutdown. Recovery occurs when OVP drops below 2.35V (80mV hysteresis). Unlike boost-only drivers, MP24833-AGN-P maintains this behavior regardless of topology because OVP monitoring is independent of FB and SW states.

Is the 0.2V feedback reference internally trimmed, and what is its temperature drift?

Yes - the 0.2V reference is factory-trimmed and specified over –40°C to +125°C with ±5% total variation (0.19V to 0.21V). This drift is fully characterized in the Electrical Characteristics table and accounts for initial tolerance, line regulation, and temperature coefficient - no external calibration is needed.