Monolithic Power Systems Inc. MP9486AGN-P

Overview

MP9486AGN-P from Monolithic Power Systems is a high-voltage, hysteretic-mode synchronous step-down converter integrating a 100V-rated high-side MOSFET with 3.5A typical peak current limit, delivering up to 1A continuous output at up to 1MHz switching frequency. It features 170µA quiescent current, PWM dimming input (DIM), and built-in short-circuit and thermal protection - designed for automotive power rails, solar charge controllers, and high-brightness LED drivers where wide-input operation and fast transient response are critical.

For engineers reviewing the MP9486AGN-P datasheet, MP9486AGN-P pinout, MP9486AGN-P application, or MP9486AGN-P equivalent, this page delivers verified technical context, SOIC-8 EP package mapping, functional pin roles, real-world application constraints, and validated alternative options - all grounded in Monolithic Power's Rev. 1.1 datasheet and official application guidance.

Technical Context

The MP9486AGN-P employs fixed-frequency hysteretic voltage-mode control with adaptive 185mV/215mV FB thresholds, eliminating external compensation while maintaining stable regulation across 4.5V–95V input. Its integrated high-side MOSFET has 500mΩ R_DS(ON) and supports bootstrap-driven gate drive via dedicated BST/SW pins.

It implements dual-level protection: cycle-by-cycle current limiting triggered at 3.5A peak, plus thermal shutdown at 150°C with 20°C hysteresis, and short-circuit recovery with ~300µs retry delay. The DIM pin accepts 0.8–1.5V logic thresholds for PWM dimming up to 20kHz, and EN provides positive-logic enable with 1.4–1.7V rising threshold and internal 2µA pull-up.

Key Specifications

Pinout & Package

MP9486AGN-P is housed in an SOIC-8 package with exposed pad (EP) for enhanced thermal dissipation. The exposed pad must be soldered to a GND plane using ≥4 thermal vias (15mil barrel, 40mil pitch) per MPS layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP9486AGN-P, MPQ4431AGL-A-Z sacrifices 100V capability for ultra-low quiescent current in non-automotive settings, while LM5164QPWPRQ1 provides AEC-Q100 compliance at the cost of external FET integration and loss of PWM dimming functionality.

Availability

MP9486AGN-P is available at Aetrix Electronics and suitable for automotive body control modules, solar charge controller auxiliary rails, high-power LED streetlight drivers, and e-bike display & telematics power systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MP9486AGN-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers since 1997.

The MP9486A belongs to MPS's high-voltage buck converter product line, engineered specifically for ruggedized power delivery in automotive, industrial, and renewable energy systems where input transients, wide voltage ranges, and minimal external components are critical design constraints.

FAQ

What is the maximum recommended output current for continuous operation?

The MP9486AGN-P delivers up to 1A continuous output current under typical conditions (T_A ≤ +85°C, SOIC-8 EP mounted on 2-layer board with thermal vias). At 100°C ambient, derating to 0.7A is required per thermal calculations using θ_JA = 34°C/W and T_J(MAX) = 150°C. Peak current remains 3.5A for short-duration transients.

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

Yes - the DIM pin may be left floating or tied to EN in standard buck configurations. When unused, connecting DIM to EN ensures both functions activate simultaneously. No pull-up or pull-down is required, as DIM input leakage is ±1µA and threshold is undefined in that state.

Is an external bootstrap diode necessary for reliable operation?

An external bootstrap diode (e.g., BAT54) is recommended only when VIN ≤ 5V, VOUT is 3.3–5V, duty cycle exceeds 65%, or switching frequency approaches 1MHz. Under typical 12–60V input conditions, the internal bootstrap regulator and 0.1µF BST-SW capacitor suffice per MPS layout guidelines.

How does the FB pin's 200mV reference affect output voltage accuracy?

The FB reference has ±6mV tolerance (185–215mV thresholds), translating to ±3% output error for a 5V output set by resistive divider. Accuracy improves with 0.1% R1/R2 resistors and proper layout - feedback trace must avoid SW node and inductor fields to prevent noise-induced regulation drift.

Does the MP9486AGN-P support synchronization to an external clock?

No - the MP9486AGN-P uses fixed-frequency hysteretic control and lacks SYNC pin or frequency programming capability. Switching frequency varies slightly with input/output voltage and load due to hysteretic timing; typical range is 600–950kHz at nominal conditions.

What is the minimum recommended output capacitance for stable operation?

MPS specifies ≥100µF total output capacitance with 100–250mΩ ESR for 5V outputs. For example: 100µF/10V aluminum electrolytic + 0.1µF ceramic in parallel. Lower ESR (<50mΩ) risks subharmonic oscillation; higher ESR (>300mΩ) increases output ripple beyond 50mV peak-to-peak.

How does short-circuit protection behave during sustained fault conditions?

Upon detecting VFB < 185mV for >10µs, the MP9486AGN-P disables the high-side switch and enters retry mode after ~300µs. Each attempt lasts ≤100µs before rechecking FB. This hiccup-mode behavior limits average power dissipation to <1W during indefinite short, preventing thermal runaway.