Monolithic Power Systems Inc. MP24895-AGH

Overview

MP24895-AGH from Monolithic Power Systems is a hysteretic-controlled, step-down white LED driver IC with integrated 36V MOSFET, designed for high-brightness LED strings in 6V–36V input systems. It delivers up to 1A output current, regulates LED current via high-side sense resistor (100mV typical feedback voltage), and supports both PWM (1000:1 resolution) and analog dimming on the EN/DIM pin. Used in automotive interior lighting and emergency signage where stable current regulation and thermal robustness are critical.

For engineers reviewing the MP24895-AGH datasheet, MP24895-AGH pinout, MP24895-AGH application, or MP24895-AGH equivalent, key selection considerations include its MSOP-8 EP package thermal performance (θJA = 50°C/W), 100mV V_RS reference tolerance (±6mV at 25°C), UVLO threshold (5.3V typ), and dual-dimming interface compatibility with microcontroller GPIO or dedicated PWM sources.

Technical Context

The MP24895-AGH implements a fixed-frequency hysteretic control architecture that eliminates external compensation components and enables sub-100ns minimum on/off times (100ns/80ns), ensuring rapid transient response to load or input changes. Its internal 1.28V reference drives both EN/DIM pull-up and current-sense comparator thresholds, enabling seamless transition between analog dimming (0.3V–2.5V linear control) and PWM dimming (100Hz–2kHz).

Current regulation relies on high-side sensing across an external resistor, with feedback referenced to VIN rather than GND - allowing direct sensing in buck configurations where the LED cathode connects to ground. Protection includes under-voltage lockout with 700mV hysteresis and thermal shutdown at 150°C with 15°C hysteresis, ensuring safe operation in enclosed automotive or industrial enclosures.

Key Specifications

Pinout & Package

MP24895-AGH is housed in an MSOP-8 EP (exposed pad) package optimized for thermal dissipation in space-constrained LED driver applications. The exposed pad must be soldered to a PCB thermal plane for effective junction-to-board heat transfer (θ_JC = 12°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT3476EFE#PBF and TPS61165DRVR, MP24895-AGH offers superior integration for single-string automotive and signage use - eliminating external MOSFETs, compensation networks, and multi-channel overhead while delivering higher current, wider input range, and simpler dimming implementation in a thermally enhanced MSOP-8 EP package.

Availability

MP24895-AGH is available at Aetrix Electronics and suitable for automotive interior lighting, emergency exit signage, low-voltage halogen replacement, and decorative architectural lighting requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP24895-AGH 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 applications.

The MP24895 product line targets cost-sensitive, thermally constrained LED driver applications in automotive, industrial, and architectural lighting - emphasizing integration, efficiency, and robust protection in compact packages.

FAQ

What is the maximum allowable LED string voltage when using MP24895-AGH?

The MP24895-AGH does not regulate output voltage - it regulates LED current in buck configuration. Maximum LED string voltage equals VIN minus diode forward drop and switch saturation voltage. With 36V input and 0.4V diode drop, up to ~34V LED string voltage is feasible, limited only by input supply and thermal design.

Can MP24895-AGH drive LEDs with cathode grounded?

Yes - the MP24895-AGH uses high-side current sensing (RS pin referenced to VIN), making it ideal for cathode-grounded LED strings. This eliminates the need for level-shifting or floating sense amplifiers required by low-side sense drivers.

Is an output capacitor required for stable operation?

No - the MP24895-AGH operates stably without an output capacitor due to hysteretic control. An output capacitor (e.g., 2.2µF) is optional and only needed if peak-to-peak LED current ripple must be reduced below 40% of average current for sensitive applications.

How is soft-start implemented on MP24895-AGH?

Soft-start is implemented by adding a capacitor from EN/DIM to GND. The internal 1.28V reference charges this capacitor; delay time ≈ 0.2ms per nF. For example, a 10nF capacitor yields ~2ms soft-start, limiting inrush current and reducing EMI during power-up.

What is the recommended minimum inductor value for 1A operation?

For 1A output at 24V input and 12V LED string, a 47µH inductor is typical. Lower values (e.g., 22µH) increase switching frequency (>500kHz) and core loss; higher values (e.g., 100µH) reduce ripple but require larger size and may limit min-load stability. Use shielded power inductors with ≤30mΩ DCR.

Does MP24895-AGH support synchronization to an external clock?

No - the MP24895-AGH uses autonomous hysteretic control without external clock input. Switching frequency varies with input/output voltage and load, typically ranging from 200kHz to 600kHz. For fixed-frequency operation, consider MPS's MPQ4425HG-A or similar current-mode buck controllers.

What is the purpose of the NC pins (3 and 7) in MSOP-8 EP package?

Pins 3 and 7 are internally not connected and must remain un-routed and un-stitched on the PCB. They serve mechanical and thermal roles in the package mold structure but carry no electrical function. Leaving them floating avoids unintended coupling or parasitic capacitance effects.