Monolithic Power Systems Inc. MP24895-AGH-Z

Overview

MP24895-AGH-Z from Monolithic Power Systems is a step-down white LED driver IC with internal 36V MOSFET, operating from 6V–36V input and delivering up to 1A output current. It uses hysteretic control for fast transient response, senses LED current via external high-side resistor with 100mV typical feedback voltage, and supports both PWM (1000:1 resolution) and analog dimming on EN/DIM pin. Used in automotive decorative lighting and low-voltage halogen replacement systems.

For engineers reviewing the MP24895-AGH-Z datasheet, MP24895-AGH-Z pinout, MP24895-AGH-Z application, or MP24895-AGH-Z equivalent, key selection criteria include input voltage range (6–36V), 1A continuous output capability, MSOP-8 EP thermal performance (θJA = 50°C/W), hysteretic loop stability, and dual-dimming interface compatibility with existing LED lighting control architectures.

Technical Context

The MP24895-AGH-Z implements a fixed-frequency hysteretic buck controller optimized for constant-current LED driving, where the internal comparator regulates inductor current by comparing the RS pin voltage against a 100mV ±6mV reference derived from a 1.28V internal bandgap. Its EN/DIM pin serves as both enable input and dimming command interface-accepting either DC voltage (0.3–2.5V) for linear analog dimming or square-wave signals (100Hz–2kHz) for PWM dimming with 1000:1 resolution.

Thermal protection activates at 150°C with 15°C hysteresis, and under-voltage lockout engages below 4.7V (rising) with 700mV hysteresis. The internal 0.2Ω RDS(ON) MOSFET and 100ns minimum on-time support efficient operation across wide input ranges while maintaining stable current regulation without external compensation.

Key Specifications

Pinout & Package

MP24895-AGH-Z is housed in an MSOP-8 EP package with exposed thermal pad for enhanced power dissipation (θJA = 50°C/W on 4-layer board). Pin 1 is RS (current-sense input), Pin 2 is GND, Pins 3 and 7 are NC, Pin 4 is EN/DIM (dual-function enable/dimming), Pins 5 and 6 are SW (internal MOSFET drain), and Pin 8 is IN (input supply).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24895-A-GH-Z, the MP24895-AGH-Z offers identical performance at lower cost and shorter lead time but lacks AEC-Q100 validation; versus LT3477, it delivers higher output current, integrated power stage, and dual-dimming support in a smaller footprint-making it superior for cost-sensitive, space-constrained LED lighting designs.

Availability

MP24895-AGH-Z is available at Aetrix Electronics and suitable for automotive interior lighting, low-voltage halogen replacement, and emergency exit signage requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP24895-AGH-Z 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-range constant-current LED regulation in automotive, industrial, and commercial lighting applications where reliability, thermal robustness, and dimming flexibility are critical.

FAQ

What is the maximum allowable input voltage for MP24895-AGH-Z?

The absolute maximum input voltage is +40V applied to the IN pin. However, the recommended operating range is 6V to 36V. Operation above 36V may trigger UVLO release but risks exceeding safe power dissipation limits, especially at high ambient temperatures or without adequate heatsinking on the MSOP-8 EP thermal pad.

Can MP24895-AGH-Z drive more than one LED string in parallel?

No-MP24895-AGH-Z is designed for single-string constant-current operation. Driving multiple parallel strings without individual current regulation leads to current imbalance due to V_F mismatch, risking thermal runaway. For multi-string applications, use one MP24895-AGH-Z per string or select a multi-channel driver IC.

How does the EN/DIM pin function during analog dimming?

During analog dimming, a DC voltage between 0.3V and 2.5V applied to EN/DIM linearly scales the internal current reference from 25% to 200% of nominal LED current. At 0.3V, output current drops to ~25%; at 2.5V, it reaches ~200%. Below 0.2V, the device shuts down completely. No external pull-up is needed-the IC provides a 1.28V internal reference.

Is an output capacitor required for stable operation?

An output capacitor is not required for basic operation, as the MP24895-AGH-Z regulates LED current directly. 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 per the datasheet.

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

Pins 3 and 7 are not internally connected and must remain unconnected in the PCB layout. They are reserved for future product variants and have no electrical function. Soldering or routing to these pins may cause unintended coupling or violate thermal pad isolation requirements.

How does the hysteretic control scheme improve system reliability?

Hysteretic control eliminates external compensation components and phase-margin concerns, making the loop inherently stable across input voltage, load, and temperature variations. This avoids oscillation or instability during rapid load transients-critical for LED drivers subjected to frequent on/off cycling or PWM dimming.

What thermal derating applies above 25°C ambient?

With θJA = 50°C/W, the maximum continuous power dissipation decreases linearly above 25°C: PD(MAX) = (150°C − TA)/50. At TA = 85°C, PD(MAX) = 1.3W. Since P_LOSS ≈ I_OUT² × R_DS(ON) + I_OUT × V_F, 1A operation remains viable up to ~85°C ambient with proper PCB copper area under the EP pad.