Monolithic Power Systems Inc. MP24895-AGH-P

Overview

MP24895-AGH-P from Monolithic Power Systems is a step-down white-LED driver IC with internal 36V MOSFET, designed for continuous-current-mode 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. Used in automotive LED lighting and emergency signage requiring stable current regulation under wide-input conditions.

For engineers reviewing the MP24895-AGH-P datasheet, MP24895-AGH-P pinout, MP24895-AGH-P application, or MP24895-AGH-P equivalent, key selection factors include its 1000:1 PWM dimming resolution, thermal shutdown at 150°C, UVLO threshold of 5.3V (rising), 0.2Ω typical R_DS(on), and dual-package availability (TSOT23-5/QFN-6) with validated pin mapping for layout-critical high-current LED systems.

Technical Context

The MP24895-AGH-P implements a fixed-frequency hysteretic control architecture that eliminates loop compensation components while maintaining stability across input and load variations. Its internal 1.275V reference feeds both the EN/DIM pull-up and current-sense comparator, enabling direct analog dimming by modulating the 100mV V_RS threshold.

Current regulation relies on high-side sensing through an external resistor between IN and RS pins, with feedback referenced to VIN rather than GND-preserving accuracy during low-V_OUT operation. The EN/DIM pin serves triple function: enable control, analog dimming input (0.3V–2.5V), and PWM command interface (100Hz–2kHz), with internal 45kΩ pull-up ensuring default startup when left open.

Key Specifications

Pinout & Package

MP24895-AGH-P is available in QFN-6 (3×3mm, exposed thermal pad) package, optimized for thermal performance in space-constrained LED modules. Pin functions are identical across package variants, with Pin 6 (N/C) unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24895GQ-A, the MP24895-AGH-P lacks AEC-Q100 certification but offers identical electrical performance and thermal behavior; versus LT3477EDD, it delivers higher integration and lower BOM count at the cost of less flexibility in switching node layout and gate drive tuning.

Availability

MP24895-AGH-P is available at Aetrix Electronics and suitable for automotive exterior lighting, emergency signage, low-voltage halogen replacement, and decorative architectural lighting requiring stable component supply across production volumes and long-lifecycle programs.

Supply support for MP24895-AGH-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-reliability, wide-input-voltage constant-current applications in automotive, industrial, and architectural lighting where integration, thermal robustness, and dimming precision are critical.

FAQ

What is the exact package type and thermal pad configuration for MP24895-AGH-P?

The MP24895-AGH-P uses the QFN-6 (3mm × 3mm) package with an exposed thermal pad on the bottom surface. This pad must be soldered to a dedicated copper pour connected to GND for optimal thermal performance and electrical stability. Pin 6 is not connected internally and should remain unconnected on the PCB.

Can MP24895-AGH-P drive more than one LED string simultaneously?

No - the MP24895-AGH-P is a single-channel constant-current LED driver. It regulates current for one series-connected LED string only. To drive multiple independent strings, separate MP24895-AGH-P units or a multi-channel driver such as the MP4000 must be used, as there is no provision for current mirroring or master-slave synchronization.

What is the minimum recommended value for the current-sense resistor (R_SENSE)?

The minimum R_SENSE is determined by the maximum LED current and 100mV feedback voltage: R_SENSE = 0.1V / I_LED. For 1A output, R_SENSE = 0.1Ω. Using lower values risks exceeding the 106mV upper limit under temperature variation and reducing current regulation accuracy due to noise sensitivity.

Does MP24895-AGH-P require an external Schottky diode, and what are its key ratings?

Yes - an external Schottky diode is mandatory in the buck topology. It must have reverse voltage rating >36V (e.g., 40V), average current rating ≥1A, and peak current rating ≥1.5× I_LED. Low forward voltage (≤0.45V) and fast recovery (<50ns) are critical to minimize conduction loss and maintain efficiency above 90%.

How does the EN/DIM pin behave when left floating versus pulled to GND?

When left open, the internal 45kΩ pull-up sets EN/DIM to ~1.28V, enabling full-output operation. Pulling below 0.2V disables the output completely. Between 0.2V and 0.3V, the device remains off; from 0.3V to 2.5V, analog dimming linearly adjusts LED current from 25% to 200% of nominal value.

Is soft-start implemented internally or externally, and how is it configured?

Soft-start is implemented externally via a capacitor from EN/DIM to GND. Charging this capacitor through the internal current source creates a controlled ramp of the current-reference voltage. A 100nF capacitor yields ~20ms soft-start time; values <2.2nF are recommended for PWM dimming to avoid duty-cycle distortion.