Monolithic Power Systems Inc. MP24894GJ-P

Overview

MP24894GJ-P 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 at 150°C. 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 replacement systems.

For engineers reviewing the MP24894GJ-P datasheet, MP24894GJ-P pinout, MP24894GJ-P application, or MP24894GJ-P equivalent, this page delivers verified technical context, package-validated pin functions, real-world dimming performance metrics, and alternative selection guidance for wide-input LED driver design.

Technical Context

The MP24894GJ-P implements hysteretic control architecture with internal 1.18V reference and 0.29V enable threshold, eliminating loop compensation while delivering fast transient response. Its EN/DIM pin supports dual-mode dimming: analog dimming (0.3V–2.7V input → 20%–100% LED current) and PWM dimming (100Hz–20kHz, 2500:1 ratio).

It integrates a 5.5V gate driver (6Ω source / 2Ω sink) for external MOSFET control, UVLO (5.6V rising, 0.4V hysteresis), and open/short LED protection. The device operates from –40°C to +125°C junction temperature and uses high-side current sensing via RS pin with ±30mV feedback hysteresis.

Key Specifications

Pinout & Package

MP24894GJ-P is housed in a thermally enhanced TSOT6 package (0.95mm × 1.6mm, 0.55mm height), optimized for high-power density LED driver layouts with exposed pad thermal path.

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-P offers simpler layout (no compensation), lower sense loss, and wider input range-making it optimal for cost-sensitive, high-efficiency buck LED drivers where diagnostics or non-buck topology are not required.

Availability

MP24894GJ-P 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-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 over two decades of expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP24894 belongs to MPS's wide-input LED current controller product line, engineered specifically for robust, high-efficiency constant-current regulation in harsh-input environments such as automotive, industrial signage, and retrofit lighting.

FAQ

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

The minimum recommended PWM dimming frequency is 100Hz, as specified in the datasheet's Dimming Control section. Operating below this may cause visible flicker or inconsistent current regulation due to insufficient switching cycles per dimming period. Frequencies between 100Hz and 20kHz ensure linear dimming response and avoid audible noise from magnetics.

Can MP24894GJ-P operate without an external MOSFET?

No. MP24894GJ-P is a controller-only IC and does not integrate a power switch. Pin 5 (DR) is a gate driver output that must drive an external N-channel MOSFET. The device relies on this external switch to implement the buck topology; no internal FET is present.

How is LED current set in MP24894GJ-P?

LED current is set by the external high-side current-sense resistor connected between IN and RS pins. Using the formula RSENSE = 200mV / ILED, a 0.2Ω resistor sets 1A LED current. The 200mV average feedback voltage is regulated by the hysteretic comparator, ensuring accurate current control independent of input or output voltage variations.

Does MP24894GJ-P support analog dimming below 20% LED current?

No. Analog dimming is specified from 20% to 100% of maximum LED current, corresponding to EN/DIM pin voltage from 0.3V to 2.7V. Below 0.25V, the IC shuts down completely. For dimming below 20%, PWM dimming must be used-supporting down to 0.04% duty cycle (2500:1 ratio).

What is the purpose of the capacitor on the EN/DIM pin?

An external capacitor from EN/DIM to GND provides soft-start functionality by controlling the ramp rate of the internal reference voltage. Its value determines startup delay (≈0.2ms/nF); for PWM dimming, C < 2.2nF is recommended to avoid filtering the dimming signal and distorting average LED current.

Is MP24894GJ-P RoHS-compliant and lead-free?

Yes. As stated in the datasheet, all MPS parts-including MP24894GJ-P-are lead-free and comply with the RoHS directive. The TSOT6 package uses green molding compound, and full compliance documentation is available on the MPS Quality Assurance webpage.

What thermal derating applies above 25°C ambient?

Derating follows PD(MAX) = (150°C − TA) / θJA, where θJA = 100°C/W for TSOT6 on a 4-layer PCB. At 85°C ambient, maximum continuous power dissipation drops to 0.65W. Layout enhancements (copper pour, thermal vias) can improve θJA and extend usable power range.