Monolithic Power Systems Inc. MP24830HL-LF-P

Overview

MP24830HL-LF-P from Monolithic Power Systems is a 4.5V–90V programmable-frequency white LED driver supporting buck and inverting buck-boost topologies, featuring 0.2V feedback reference, cycle-by-cycle over-current protection, and integrated analog/PWM dimming on a single pin. It delivers up to 1A LED current with ±3% regulation accuracy and operates across automotive and industrial lighting systems requiring wide-input, high-voltage LED biasing.

For engineers reviewing the MP24830HL-LF-P datasheet, MP24830HL-LF-P pinout, MP24830HL-LF-P application, or MP24830HL-LF-P equivalent, key selection criteria include input voltage range (4.5–85V), programmable switching frequency (30–465 kHz via RSET), dual dimming interface (DIM/DIMO), thermal shutdown at 160°C, and QFN-14 package compatibility with high-power density PCB layouts.

Technical Context

The MP24830HL-LF-P implements current-mode control using an internal error amplifier (GM = 80 µS) and peak-current sensing via the CS pin, enabling fast transient response and stable loop compensation across variable LED string voltages. Its architecture supports both step-down (buck) and inverting step-up/down (buck-boost) configurations without topology change, driven by external MOSFETs controlled through DR and SW pins.

Dimming is implemented through a unified DIM pin accepting 0.6–1.95V analog signals for linear 0–100% LED current control or >2V PWM inputs (100Hz–2kHz), while DIMO provides gate-drive output for external dimming FETs. Protection logic includes open-string detection (via OVP pin threshold of 1.2V), short-circuit foldback (OVP < 0.4V + FB < 0.1V), and latch-off on FB ≥ 600mV for immediate fault shutdown.

Key Specifications

Pinout & Package

MP24830HL-LF-P is housed in a thermally enhanced 14-pin QFN package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad connected to VSS. The package supports high-power dissipation (2.6W at TA = 25°C) and requires controlled-impedance layout for SW, BST, and CS nodes to minimize EMI and gate drive instability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24830-AQ, the MP24830HL-LF-P offers identical performance at lower cost and smaller footprint but lacks AEC-Q100 certification; versus LT3965, it provides superior input voltage range and analog dimming simplicity but no channel independence or digital interface.

Availability

MP24830HL-LF-P is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, LCD backlights, and railway cabin lighting requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP24830HL-LF-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 core expertise in DC/DC converters, LED drivers, and motor drivers for automotive, industrial, and consumer markets.

The MP24830 belongs to MPS's high-voltage LED driver product line, designed specifically for wide-input, constant-current biasing of white LED arrays in harsh environments where input transients, thermal stress, and long-term reliability are critical.

FAQ

What is the maximum LED string voltage supported by MP24830HL-LF-P in buck-boost mode?

The MP24830HL-LF-P does not impose a hard upper limit on LED string voltage in buck-boost mode; instead, it depends on external component ratings. With appropriate MOSFET (e.g., Si4100DY, 100V VDS), Schottky diode, and output capacitor voltage ratings, it reliably drives strings up to 80V - verified in typical applications with 6–10 LEDs (3.2V each) at 1A.

Can MP24830HL-LF-P operate without an external MOSFET?

No. MP24830HL-LF-P is a controller IC only and requires external high-side N-channel MOSFETs for both buck and buck-boost topologies. The DR pin drives the gate, while SW and CS interface directly with the MOSFET source and sense resistor. No internal power switch is integrated.

How is the 0.2V feedback reference used to set LED current?

LED current is set by placing a sense resistor (RFB) between FB and VSS. Using Ohm's Law: ILED = 0.2V / RFB. For example, a 0.2Ω resistor yields 1A nominal current. The FB pin's ±4% reference tolerance and 50nA input bias current ensure ≤±5% total current accuracy across temperature.

Does MP24830HL-LF-P support synchronous rectification?

No. The MP24830HL-LF-P is designed for use with external Schottky diodes in buck mode and inverting buck-boost mode. It lacks dedicated gate drive outputs for synchronous rectifier control; the DR pin drives only the high-side switch, and no low-side driver is provided.

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

INGND serves as the isolated reference for the EN and DIM inputs, decoupling dimming/enable logic from power ground noise. It must be connected to the same potential as the source of the external dimming MOSFET or the controller's logic supply ground - never tied directly to VSS unless the system uses common-ground signaling.

How does the OVP pin detect open LED conditions?

During open LED fault, no current flows through the sense resistor, causing FB voltage to drop near 0V. This forces the error amplifier to saturate, increasing duty cycle until the OVP pin voltage (fed by a resistor divider from LED+ to VSS) reaches 1.2V, triggering shutdown. Recovery occurs only after OVP falls below 1.2V and FB rises above 0.1V.

Is the MP24830HL-LF-P RoHS-compliant and halogen-free?

Yes. MP24830HL-LF-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. The "-LF" suffix explicitly denotes RoHS-compliant packaging, and MPS confirms green status via its Quality Assurance portal.