Monolithic Power Systems Inc. MP2386GG-Z

Overview

MP2386GG-Z from Monolithic Power Systems is a fully integrated, synchronous buck converter delivering 8A continuous output current with 4.5V–24V input range, 700kHz fixed switching frequency, and 105μA quiescent current. It employs adaptive constant-on-time (COT) control and internal low R_DS(ON) MOSFETs (HS: 34mΩ, LS: 10mΩ) for high efficiency in compact power rails for security cameras and flat-panel displays.

For engineers reviewing the MP2386GG-Z datasheet, MP2386GG-Z pinout, MP2386GG-Z application, or MP2386GG-Z equivalent, key selection considerations include its QFN-11 (2mm×2mm) package, remote differential sensing capability, DC auto-tune loop for load/line regulation, and integrated protections including OCP, OVP, UVP, and thermal shutdown with auto-retry.

Technical Context

The MP2386GG-Z implements adaptive COT control with DC auto-tune loop feedback to maintain stable regulation across wide load and line variations. Its valley-current-limiting OCP uses the low-side MOSFET's R_DS(ON) for cycle-by-cycle protection without external sense resistors.

It integrates dual ground domains (PGND and AGND), bootstrap gate drive (BST), open-drain power-good (PG), and internal soft-start with 1.7ms typical ramp time. The device supports ceramic and POSCAP output capacitors and enters skip mode at light load to sustain >90% efficiency down to 10mA.

Key Specifications

Pinout & Package

MP2386GG-Z is housed in a thermally enhanced QFN-11 (2mm × 2mm, 0.5mm pitch) package with exposed thermal pad. Pin 1 is marked by dot; top marking includes product code "HT", year code "Y", and lot number "LLL".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with RTQ2134B-QT and TPS54821RHLR, MP2386GG-Z offers superior current density (8A in 2mm×2mm), faster transient response via adaptive COT, and tighter output regulation via DC auto-tune-making it optimal for space- and performance-critical embedded power rails.

Availability

MP2386GG-Z is available at Aetrix Electronics and suitable for security cameras, flat-panel displays, and digital set-top boxes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2386GG-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 power management ICs, with over two decades of innovation in DC/DC conversion, motor drivers, and LED lighting solutions.

The MP2386 belongs to MPS's high-efficiency, low-I_Q synchronous buck converter product line, engineered for compact, thermally constrained applications in surveillance, consumer displays, and broadband infrastructure where minimal external components and fast transient response are critical.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2386GG-Z is stable with ceramic or POSCAP output capacitors. For 1V output, ≥220µF total capacitance is recommended (e.g., four 47µF/6.3V X5R ceramics). Equivalent series resistance (ESR) below 5mΩ ensures adequate phase margin without external compensation.

Can MP2386GG-Z operate with an input voltage below 4.5V?

No. The absolute minimum VIN is 4.5V per datasheet specifications. Below this, the internal VCC LDO cannot regulate, and the UVLO circuit disables switching. Attempting operation at 4.3V will cause intermittent startup failure and potential instability.

How does the valley-current OCP respond during short-circuit events?

During short-circuit, the MP2386GG-Z triggers valley-current limit (7–11A), then enters hiccup mode after UVP-2 activation (<50% V_REF). Output discharge (40Ω) actively pulls VOUT toward GND, and restart attempts occur every ~20ms until fault clears.

Is external ramp compensation required for all ceramic-capacitor designs?

No. Internal ramp compensation suffices for most ceramic-capacitor configurations. External ramp (1MΩ + 220pF) is only needed if jitter exceeds specification or instability occurs under dynamic load - confirmed via VFB ripple measurement on oscilloscope.

What is the maximum allowable PCB temperature rise at 8A continuous load?

On a 4-layer EV2386-G-00A evaluation board, case temperature rise is ≤60°C at 8A/12V_IN/1V_OUT. With proper thermal pad soldering (≥90% coverage) and 2oz copper on inner layers, junction temperature stays below 125°C at 25°C ambient.

Does MP2386GG-Z support pre-biased output startup?

Yes. When VOUT is pre-biased above the target voltage at startup, the MP2386GG-Z disables both HS and LS switches until internal VREF ramps up past the sensed FB voltage - preventing reverse current and ensuring monotonic rise.

How is the EN pin protected against overvoltage?

The EN pin has absolute maximum rating of 4.5V. Exceeding this risks permanent damage. An external Zener clamp (e.g., 3.6V) is recommended if driven from >3.6V logic; internal 1MΩ pull-down ensures defined state during power-up.