Monolithic Power Systems Inc. MP9486GN-P

Overview

MP9486GN-P from Monolithic Power Systems is a 100V-input, 1A synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, hysteretic voltage-mode control, and PWM dimming input-designed for automotive power rails, solar charge controllers, and high-power LED drivers operating from 4.5V to 95V input.

For engineers reviewing the MP9486GN-P datasheet, MP9486GN-P pinout, MP9486GN-P application, or MP9486GN-P equivalent, this device delivers fast transient response without external compensation, supports up to 1MHz switching, integrates short-circuit protection and thermal shutdown, and enables LED dimming via dedicated DIM pin with 50ns propagation delay.

Technical Context

The MP9486GN-P employs adaptive hysteretic voltage-mode control with dual FB thresholds (185mV low / 215mV high) to maintain 200mV average feedback voltage-eliminating loop compensation components while enabling sub-100ns load-step response. Its internal floating gate driver uses bootstrap charging with 5V regulated BST supply and 2.2V UVLO.

It integrates a 100V-rated high-side MOSFET with 2.5A current limit, supports enable-controlled startup with 1.55V EN threshold and 320mV hysteresis, and features dedicated DIM input with 1.15V rising threshold for direct PWM dimming of LED strings without external logic.

Key Specifications

Pinout & Package

MP9486GN-P is housed in an SOIC-8 package with exposed pad for enhanced thermal dissipation (θJA = 34°C/W on 2-layer board). The exposed pad must be soldered to a GND plane using thermal vias for reliable 1A operation at elevated ambient temperatures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage buck converter applications.

Compared with MP9486GN-P, MPQ4420AGL-A-Z offers higher output current but lacks 100V capability, while LM5164QPWPRQ1 provides AEC-Q100 compliance and lower I_Q at the cost of added design overhead from current-mode loop compensation.

Availability

MP9486GN-P is available at Aetrix Electronics and suitable for automotive lighting systems, solar energy converters, e-mobility control units, and industrial LED signage requiring stable component supply across extended temperature and input voltage ranges.

Supply support for MP9486GN-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting solutions.

The MP9486 belongs to MPS's high-voltage buck converter product line, engineered specifically for ruggedized power delivery in automotive, industrial, and renewable energy applications where wide input range and fault resilience are critical.

FAQ

What is the maximum recommended input voltage for continuous operation?

The MP9486GN-P is rated for continuous operation up to 95V input, per Recommended Operating Conditions. Absolute maximum rating is 100V, but sustained operation above 95V risks exceeding thermal limits and reducing long-term reliability-even with adequate heatsinking.

Can the DIM pin be left unconnected in non-LED applications?

Yes-the DIM pin can be tied directly to EN to enable simultaneous startup/shutdown, or pulled to GND to disable dimming. Leaving it floating is not recommended due to noise susceptibility; internal weak pull-down is not present, so external bias is required for deterministic behavior.

Does the MP9486GN-P require an external bootstrap diode?

An external bootstrap diode is optional but recommended when VIN ≤ 5V, VOUT is 3.3–5V, duty cycle exceeds 65%, or switching frequency approaches 1MHz. It improves gate drive stability and efficiency by supplementing the internal BST regulator-commonly implemented with BAT54 or IN4148.

How does the hysteretic control affect output voltage accuracy?

Output voltage accuracy depends on FB resistor divider tolerance and the 185–215mV hysteresis band. With 1% resistors, typical output error is ±1.5% over line/load/temperature-tighter than standard current-mode buck regulators without trimming, due to adaptive threshold adjustment compensating for propagation delays.

What thermal vias configuration is required under the exposed pad?

MPS recommends ≥4 thermal vias (15mil barrel diameter, 40mil center-to-center pitch) connecting the exposed pad directly to an internal or bottom-layer GND plane. These vias must be filled or capped to prevent solder wicking during reflow and ensure mechanical integrity and thermal resistance <4°C/W to PCB ground.

Is the MP9486GN-P RoHS and REACH compliant?

Yes-MP9486GN-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full material declarations and test reports are available through MPS's Quality Assurance portal upon request.

Can the MP9486GN-P drive a 12V LED string directly?

No-it is a buck regulator, not a constant-current LED driver. To drive a 12V LED string, configure it as a constant-voltage source (e.g., 12.2V output), then add an external current-sense resistor and op-amp feedback to FB to convert to constant-current mode per MPS Application Note AN-107.