Monolithic Power Systems Inc. MP24833GN-P

Overview

MP24833GN-P from Monolithic Power Systems is a 55V, 3A current-mode white LED driver IC supporting buck, boost, and buck-boost topologies. It integrates a 0.19Ω internal MOSFET, operates at fixed 200kHz switching frequency, delivers 0.198V reference voltage for LED current sensing, and enables combined analog/PWM dimming via a single EN/DIM pin. It is used in LCD backlight panels with 7-series white LEDs at 1A under 36V input.

For engineers reviewing the MP24833GN-P datasheet, MP24833GN-P pinout, MP24833GN-P application, or MP24833GN-P equivalent, this page provides verified topology support (buck/boost/buck-boost), confirmed dimming interface behavior (0.67–1.36V linear analog range, 100Hz–2kHz PWM), validated protection features (open-string, short-circuit, thermal shutdown), and SOIC8E package mechanical data.

Technical Context

The MP24833GN-P implements peak current-mode control with slope compensation, where the error amplifier output directly modulates peak inductor current. Its feedback loop references a precise 0.198V internal bandgap, enabling stable LED current regulation across 4.5V–55V input and wide temperature range (–40°C to +125°C).

It supports three distinct DC-DC configurations: step-down (buck) with VIN > VLED, step-up (boost) with VIN < VLED, and inverting buck-boost with VIN near VLED. Protection logic uses dual thresholds on OVP (1.2V trip, 60mV hysteresis) and FB (<0.1V + OVP <0.2V for short-circuit foldback), while EN/DIM referenced to INGND decouples dimming control from power ground.

Key Specifications

Pinout & Package

MP24833GN-P is housed in an SOIC-8 EP (exposed pad) package per JEDEC MS-012 BA, with thermal pad connected to VSS for enhanced heat dissipation. Pin 2 (VSS) and the exposed pad share the same electrical node and must be soldered to a large copper pour for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24833GD-A, MP24833GN-P lacks automotive qualification but matches all electrical specs and pinout; compared with LM3409HVMM/NOPB, it delivers higher integration (integrated 0.19Ω switch), wider 55V input, and unified dimming control - reducing component count and layout complexity in consumer and industrial LED systems.

Availability

MP24833GN-P is available at Aetrix Electronics and suitable for LCD backlight panels, notebook computers, automotive interior lighting, and portable GPS devices requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MP24833GN-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-efficiency, multi-topology LED drivers for display, automotive, and portable lighting - emphasizing integration, thermal robustness, and simplified system design through embedded power switches and unified control interfaces.

FAQ

What is the maximum LED string voltage supported by MP24833GN-P?

The MP24833GN-P does not impose a fixed maximum LED string voltage. In boost or buck-boost mode, output voltage is limited only by external component ratings (e.g., Schottky diode PIV, output capacitor voltage rating) and the 55V absolute maximum SW-to-VSS rating. Typical designs achieve up to 48V output with appropriate 60V-rated components.

Can MP24833GN-P operate without an external Schottky diode in synchronous rectification mode?

No. MP24833GN-P uses an internal N-channel MOSFET as the high-side switch only; it does not include a synchronous rectifier. An external Schottky diode (e.g., B360) is mandatory in all topologies to provide the freewheeling path during switch-off periods. Synchronous operation would require a second actively controlled switch, which this device lacks.

How is open LED protection triggered and recovered?

Open LED protection activates when the FB pin voltage drops below 0.1V and the OVP pin voltage rises to 1.2V (set by external resistor divider). This causes the internal switch to disable. Recovery occurs automatically when the OVP pin voltage falls below 1.14V (1.2V minus 60mV hysteresis), allowing normal regulation to resume once the LED string is reconnected.

What is the minimum inductor value recommended for stable operation?

The datasheet specifies a practical inductor range of 10µH to 220µH. For 200kHz operation at 3A, a minimum of 10µH is acceptable, but 68µH is recommended for buck-boost designs to maintain continuous conduction mode (CCM) and limit peak current to ≤2.5A. Inductor saturation current must exceed 3A.

Does MP24833GN-P support true 0% LED current during analog dimming?

Yes. When the EN/DIM voltage relative to INGND is below 0.6V, the device enters shutdown mode with 6µA quiescent current and zero LED current. Between 0.6V and 0.67V, the LED current remains at 0%; full 0–100% linear scaling begins at 0.67V and reaches maximum at 1.36V.

Is the exposed thermal pad electrically connected internally?

Yes. The exposed pad is internally bonded to Pin 2 (VSS) and forms part of the primary power return path. It must be soldered to a dedicated PCB copper pour connected to the system's main ground plane to ensure both electrical integrity and thermal performance - failure to do so risks thermal shutdown under 3A load.