Monolithic Power Systems Inc. MP24895GJ-P

Overview

MP24895GJ-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 combined PWM/analog dimming on the EN/DIM pin for automotive lighting and signage applications.

For engineers reviewing the MP24895GJ-P datasheet, MP24895GJ-P pinout, MP24895GJ-P application, or MP24895GJ-P equivalent, key selection criteria include its 1000:1 PWM dimming resolution, thermal shutdown at 150°C, UVLO threshold of 5.3V (rising), TSOT23-5 package footprint, and dual-dimming capability requiring no external op-amp or controller.

Technical Context

The MP24895GJ-P implements a fixed-frequency hysteretic control architecture where inductor current thresholds are set by internal reference voltages (1.275V) and external resistor divider (R1/R2) to define upper/lower current hysteresis bands. Its EN/DIM pin serves as both enable input and dimming command interface-internally pulled up to 1.275V, supporting analog dimming (0.3V–2.5V DC) and PWM dimming (100Hz–2kHz square wave).

Current regulation relies on high-side sensing across an external resistor between IN and RS pins, with feedback referenced to VIN (not GND), enabling accurate 100mV ±20mV average V_RS regulation. Protection features include under-voltage lockout with 700mV hysteresis and thermal shutdown with 15°C hysteresis, both implemented in hardware without external components.

Key Specifications

Pinout & Package

MP24895GJ-P is packaged in TSOT23-5 - a 2.9mm × 1.6mm × 0.9mm surface-mount package with 0.95mm lead pitch, optimized for space-constrained LED modules. The exposed pad is not electrically connected; thermal dissipation relies on PCB copper area under Pin 2 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24895GJ-A, the MP24895GJ-P lacks AEC-Q100 qualification but offers lower cost and same core functionality for non-automotive use; versus LM3409HVMM/NOPB, it trades design flexibility for BOM reduction and layout simplicity in sub-1A applications.

Availability

MP24895GJ-P is available at Aetrix Electronics and suitable for automotive interior lighting, emergency exit signage, architectural accent lighting, and low-voltage halogen replacement requiring stable component supply across industrial and commercial production cycles.

Supply support for MP24895GJ-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 mixed-signal ICs for power management, LED lighting, and motor control.

The MP24895 belongs to MPS's white-LED driver product line, engineered specifically for wide-input, constant-current buck conversion in harsh environments where reliability, thermal robustness, and dimming fidelity are critical.

FAQ

What is the maximum recommended LED string voltage for MP24895GJ-P?

The MP24895GJ-P does not regulate output voltage directly-it regulates LED current in buck topology. Maximum string voltage equals VIN minus minimum dropout (determined by R_DS(on), diode V_F, and inductor DCR). At 36V input and 1A, typical max string voltage is ~32V (e.g., 9×3.5V white LEDs). Exceeding this causes dropout and current collapse.

Can MP24895GJ-P operate with input voltage below 6V?

No. The under-voltage lockout activates below 4.7V (rising threshold), disabling switching. Operation below 6V violates the Recommended Operating Conditions and risks unstable regulation or thermal stress due to increased duty cycle and conduction losses.

How is analog dimming implemented on the EN/DIM pin?

Analog dimming applies a 0.3V–2.5V DC voltage to EN/DIM, which linearly scales the internal 100mV current-sense reference from 0mV to 100mV. This changes LED current from 0% to 200% of nominal (e.g., 0–2A for R_SENSE=0.1Ω), with 0.2V disabling output entirely.

Why does MP24895GJ-P use high-side current sensing instead of low-side?

High-side sensing keeps the LED cathode grounded, simplifying thermal management and EMI filtering. It avoids disrupting the return path for multiple parallel LED strings and enables direct connection to grounded heat sinks-critical for automotive and signage applications where mechanical mounting dictates cathode grounding.

Is an output capacitor required for stable operation?

No. The MP24895GJ-P regulates LED current, not voltage, so output capacitance is optional. Add a 2.2µF ceramic capacitor across the LED string only if peak-to-peak current ripple must be reduced below 40% of average current-typically needed for flicker-sensitive applications like video studio lighting.

What is the minimum off-time specification and why does it matter?

The minimum off-time is 80ns (guaranteed by design). It sets the practical lower limit for achievable switching frequency at high input-to-output voltage ratios. For example, at VIN=36V and V_LED=12V, duty cycle ≈33%, so t_OFF ≥80ns constrains max frequency to ~4.2MHz - well above typical 200–600kHz design targets, ensuring reliable operation.