Monolithic Power Systems Inc. MP24894GJ-Z

Overview

MP24894GJ-Z from Monolithic Power Systems is a step-down LED-current controller IC operating in continuous conduction mode (CCM) with 6V–60V input range, 200mV average feedback voltage, 2500:1 PWM dimming ratio, and thermal shutdown protection. It regulates high-brightness LED strings up to >1A using external high-side current sensing and drives automotive decorative lighting, emergency signage, and low-voltage halogen replacements.

For engineers reviewing the MP24894GJ-Z datasheet, MP24894GJ-Z pinout, MP24894GJ-Z application, or MP24894GJ-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed dimming behavior (analog + PWM), real-world thermal limits (150°C shutdown), and package-specific layout guidance for TSOT6.

Technical Context

The MP24894GJ-Z implements hysteretic control architecture with no loop compensation required, using an internal 1.18V reference and 0.29V enable threshold to initiate switching. Its feedback path monitors voltage across an external high-side sense resistor (RS), regulating LED current within ±30mV hysteresis around 200mV.

It integrates a 5.5V gate driver (6Ω source / 2Ω sink) for external N-channel MOSFET control, supports soft-start via EN/DIM capacitor, and provides dual dimming: analog dimming (0.3V–2.7V → 20%–100% I_LED) and PWM dimming (100Hz–20kHz, 2500:1 ratio). UVLO triggers at 5.6V V_CC with 0.4V hysteresis.

Key Specifications

Pinout & Package

MP24894GJ-Z is housed in a 6-pin TSOT6 package (0.95mm × 1.60mm, 0.5mm pitch), optimized for high-power density LED driver layouts with minimal thermal resistance (θ_JA = 100°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED-current controller applications.

Compared with LT3761EFE#PBF and TPS92692QPWPRQ1, MP24894GJ-Z offers the lowest component count for fixed-buck LED control, highest dimming resolution in its class, and best thermal efficiency due to 200mV feedback-making it optimal for space- and efficiency-constrained signage and retrofit lighting.

Availability

MP24894GJ-Z is available at Aetrix Electronics and suitable for automotive decorative lighting, emergency exit signage, and low-voltage halogen replacement requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP24894GJ-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 mixed-signal ICs for power management, LED lighting, and motor drive applications.

The MP24894 belongs to MPS's LED-current controller product line, engineered specifically for wide-input-voltage, high-efficiency buck-based LED drivers in industrial, commercial, and transportation lighting systems.

FAQ

What is the minimum recommended PWM dimming frequency for MP24894GJ-Z?

The minimum recommended PWM dimming frequency is 100Hz (0.1kHz), as specified in the Electrical Characteristics table. Operating below this may cause visible flicker or inconsistent current regulation due to insufficient switching cycles per dimming period. The device supports up to 20kHz for smooth, high-frequency dimming compatible with camera capture and human perception thresholds.

Can MP24894GJ-Z operate without an external MOSFET?

No. MP24894GJ-Z is a controller-not a driver IC with integrated power switch-and requires an external N-channel MOSFET connected to the DR pin. The IC provides gate drive signals but does not include power transistors; omitting the MOSFET renders the device non-functional for LED current regulation.

How is LED current set on MP24894GJ-Z?

LED current is set by the external high-side current-sense resistor (R_SENSE) between the IN and RS pins, using the formula R_SENSE = 0.2V / I_LED. For example, a 0.2Ω resistor sets 1A LED current. The 200mV feedback target is fixed and trimmed; no external reference or divider is needed.

Does MP24894GJ-Z support analog dimming only, or both analog and PWM?

MP24894GJ-Z supports both analog and PWM dimming through the same EN/DIM pin. Analog dimming uses 0.3V–2.7V DC voltage to scale LED current from 20% to 100%. PWM dimming applies a square wave (≥3V amplitude, 100Hz–20kHz) where average current follows duty cycle-enabling simultaneous use in hybrid dimming systems.

What protection features are built into MP24894GJ-Z?

MP24894GJ-Z includes open LED protection (disables output if no current detected), short LED protection (shuts down if RS pin voltage exceeds safe threshold), thermal shutdown (150°C trip with 20°C hysteresis), and input UVLO (5.6V V_CC with 0.4V hysteresis). All protections are fully autonomous and require no external circuitry.

Is the TSOT6 package RoHS-compliant and lead-free?

Yes. MP24894GJ-Z is lead-free and complies with the EU RoHS directive. Monolithic Power Systems confirms green status for this part, and all packaging materials meet JEDEC MSL-1 moisture sensitivity requirements for standard surface-mount assembly processes.

What is the purpose of the VCC pin, and what capacitor value is required?

VCC is the output of the internal LDO regulator (5.5V–6V), powering internal circuitry. A 1µF X5R/X7R ceramic capacitor with ≤2mm trace length to GND is required per the datasheet. This capacitor stabilizes the internal supply and must be placed adjacent to the VCC and GND pins to prevent oscillation or startup failure.