Monolithic Power Systems Inc. MP24895GQ-P

Overview

MP24895GQ-P from Monolithic Power Systems is a step-down white-LED driver IC with internal 36V MOSFET, designed for continuous-current operation across 6V–36V input and delivering up to 1A LED current. It uses hysteretic control for fast transient response, senses current via external high-side resistor with 100mV typical feedback voltage, and supports simultaneous PWM and analog dimming on the EN/DIM pin-used in automotive LED lighting and emergency signage.

For engineers reviewing the MP24895GQ-P datasheet, MP24895GQ-P pinout, MP24895GQ-P application, or MP24895GQ-P equivalent, key selection criteria include its 1000:1 PWM dimming resolution, thermal shutdown at 150°C, UVLO threshold of 5.3V (rising), and QFN-6 (3×3mm) package with exposed thermal pad for high-power-density LED systems.

Technical Context

The MP24895GQ-P implements a fixed-frequency hysteretic control architecture that regulates LED current by comparing sensed voltage across an external high-side resistor against a 100mV ±6mV reference. Its internal 36V/0.4Ω MOSFET enables direct drive of series-connected LEDs without external switching components.

Dimming is implemented through dual-mode control on the EN/DIM pin: analog dimming accepts 0.3V–2.5V DC to linearly scale LED current from 25% to 200%, while PWM dimming accepts 100Hz–2kHz square waves with ≥1.5V amplitude to modulate average current proportionally to duty cycle.

Key Specifications

Pinout & Package

MP24895GQ-P is housed in a thermally enhanced QFN-6 (3×3mm) package with exposed paddle for PCB-level heat dissipation. The package supports 2.5W continuous power dissipation at T_A = 25°C and features 50°C/W junction-to-ambient thermal resistance on a 4-layer JEDEC board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT3474EDD#PBF and TPS61165DRVR, MP24895GQ-P offers superior integration for wide-input industrial LED systems-no external compensation, no frequency programming, and native support for 6V–36V inputs-while maintaining high dimming fidelity and thermal robustness without added complexity.

Availability

MP24895GQ-P is available at Aetrix Electronics and suitable for automotive LED lighting, emergency signage, low-voltage halogen replacement, and industrial panel indicators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP24895GQ-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 MP24895 belongs to MPS's LED driver product line, engineered specifically for high-efficiency, wide-input-voltage, constant-current LED illumination in automotive, industrial, and safety-critical applications.

FAQ

What is the minimum recommended R_SENSE value for 1A LED current?

The MP24895GQ-P regulates the voltage across R_SENSE to 100mV ±6mV. For 1A output, R_SENSE = 100mV / 1A = 0.1Ω. A 0.1Ω, 1% tolerance, 0805 or 1206 thick-film resistor with ≥0.25W rating is recommended to maintain accuracy and avoid thermal drift under full load.

Can MP24895GQ-P operate with input voltage below 6V?

No. The absolute minimum operating input voltage is 6V per the Recommended Operating Conditions table. Below this, the internal UVLO circuit prevents startup, and the device remains disabled. Input voltages below 4.7V (UVLO falling threshold) guarantee shutdown, making it unsuitable for 5V-only systems.

Is the EN/DIM pin compatible with 3.3V microcontroller GPIO without level shifting?

Yes. The EN/DIM pin accepts logic-high signals up to 2.5V for analog dimming and ≥1.5V for PWM dimming. A 3.3V GPIO can safely drive it in PWM mode if series resistance limits current, but for analog dimming, a resistor divider or DAC output is needed to stay within 0.3V–2.5V range.

Does MP24895GQ-P require an output capacitor for stable operation?

No. The datasheet states an output capacitor is not necessary for basic operation. However, if peak-to-peak LED current ripple must be kept below 40% of average current (e.g., for flicker-sensitive applications), a 2.2µF ceramic capacitor across the LED string is recommended to reduce ripple proportionally.

How does the soft-start function interact with PWM dimming?

Soft-start is implemented by charging an external capacitor on the EN/DIM pin. For PWM dimming, C_SS must be <2.2nF to prevent averaging of the PWM signal, which would distort dimming linearity. Larger capacitors are acceptable only in analog dimming or enable-only configurations.

What is the maximum allowable ambient temperature for continuous 1A operation in QFN-6 package?

At 1A output and 24V input, power dissipation is ~0.4W. With θ_JA = 50°C/W, temperature rise is 20°C. Given T_J(MAX) = 150°C, maximum ambient temperature is 130°C - but derating is required per thermal design guidelines. For reliable 1A operation, keep T_A ≤ 85°C with adequate PCB copper pour and airflow.