Monolithic Power Systems Inc. MP24892DJ-LF-Z

Overview

MP24892DJ-LF-Z from Monolithic Power Systems is a step-down white LED driver IC operating in continuous conduction mode with 6V–45V input range, 1A output current capability, 202mV feedback reference voltage, and integrated thermal shutdown. It drives high-brightness LEDs in automotive decorative lighting, emergency signage, and low-voltage halogen replacement systems using high-side current sensing and hysteretic control.

For engineers reviewing the MP24892DJ-LF-Z datasheet, MP24892DJ-LF-Z pinout, MP24892DJ-LF-Z application, or MP24892DJ-LF-Z equivalent, key selection criteria include its 1000:1 PWM dimming resolution, dual analog/PWM dimming support via EN/DIM pin, inherent open/short LED protection, and TSOT23-5 package thermal performance at up to 125°C junction temperature.

Technical Context

The MP24892 employs a hysteretic control architecture-eliminating loop compensation-where the internal comparator regulates LED current by maintaining the RS pin voltage within 202mV ±30mV via high-side sense resistor feedback. Its 1.275V internal reference sets both enable threshold (0.25V–0.3V) and current reference scaling.

Dimming is implemented through the EN/DIM pin: DC analog control (0.3V–2.5V) linearly adjusts LED current from 25% to 200%, while PWM signals (0.1–2kHz) modulate average current proportionally to duty cycle. The 100ns minimum on/off times support stable operation up to 600kHz switching frequency.

Key Specifications

Pinout & Package

MP24892DJ-LF-Z is housed in a thermally enhanced TSOT23-5 package (2.9mm × 1.6mm × 0.9mm), optimized for high-power density LED driver applications with θ_JA = 100°C/W on 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT3474EDD#TRPBF and TPS61165DRVR, MP24892DJ-LF-Z offers superior thermal efficiency due to its 202mV sense voltage and hysteretic architecture, eliminates compensation design effort, and integrates fault protection-making it optimal for space-constrained, wide-input industrial LED drivers.

Availability

MP24892DJ-LF-Z is available at Aetrix Electronics and suitable for automotive decorative lighting, emergency exit signage, and low-voltage halogen replacement requiring stable component supply across extended product lifecycles.

Supply support for MP24892DJ-LF-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 analog and power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MP24892 belongs to MPS's WLED driver product line, engineered specifically for high-reliability, wide-input industrial and automotive LED lighting where efficiency, small footprint, and robust fault protection are mandatory.

FAQ

What dimming methods does MP24892DJ-LF-Z support?

The MP24892DJ-LF-Z supports both PWM dimming (0.1–2kHz square wave applied to EN/DIM) and analog dimming (0.3–2.5V DC on EN/DIM), with LED current scaling linearly from 25% to 200% across the analog range. No external circuitry is needed for analog mode, while PWM requires only an NPN transistor for signal isolation per the datasheet Figure 4.

How is LED current set and what tolerance can be expected?

LED current is set by an external high-side sense resistor using R_SENSE = 202mV / I_LED. With typical 1% resistor tolerance and 202mV ±30mV reference, total current accuracy is ±6.5% over temperature and line. Layout symmetry between IN and RS pins is critical to avoid measurement error from parasitic resistance.

Does MP24892DJ-LF-Z require external compensation components?

No. The MP24892DJ-LF-Z uses a hysteretic control architecture that inherently stabilizes the converter without requiring external compensation capacitors or resistors. This simplifies design, reduces BOM count, and improves transient response time compared to voltage-mode or current-mode controllers.

What protection features are integrated?

The device includes thermal shutdown (150°C), inherent open-LED protection (disables output if no current detected at RS), short-LED protection (limits current if RS voltage exceeds safe threshold), and input overvoltage clamp (50V absolute max on VIN/SW). These operate autonomously without software or external supervision.

Can MP24892DJ-LF-Z drive multiple parallel LED strings?

No-it is designed for single-string constant-current operation. Driving parallel strings would cause current imbalance due to forward voltage mismatches. For multi-string applications, separate MP24892 channels or a matrix driver IC with individual current regulation per string is required.

What is the recommended input capacitor value and type?

A 10µF–22µF ceramic or low-ESR tantalum capacitor rated ≥50V should be placed as close as possible to the IN and GND pins. This suppresses input surge current and high-frequency noise; insufficient capacitance causes VIN droop during switching transitions and may trigger undervoltage lockout.

Is the TSOT23-5 package suitable for 1A continuous operation?

Yes-when mounted on a 4-layer PCB with recommended land pattern and thermal vias, the TSOT23-5 achieves θ_JA = 100°C/W. At 1A output and 24V input, typical power dissipation is ~0.5W, resulting in ~50°C rise above ambient-well within the 125°C max operating junction temperature.