Monolithic Power Systems Inc. MPM3810GQB-25-Z

Overview

MPM3810GQB-25-Z from Monolithic Power Systems is a fixed-output 2.5V, 1.2A peak synchronous step-down DC-DC power module with integrated inductor and MOSFETs in a QFN-12 (2.5mm × 3.0mm × 0.9mm) package. It operates from 2.5V–6V input, delivers ±3% output accuracy at 10mA, features constant-on-time (COT) control for fast transient response, and includes power-good indication, thermal shutdown, and hiccup-mode short-circuit protection - ideal for space-constrained portable SSD/HDD power rails.

For engineers reviewing the MPM3810GQB-25-Z datasheet, MPM3810GQB-25-Z pinout, MPM3810GQB-25-Z application, or MPM3810GQB-25-Z equivalent, key selection criteria include its fixed 2.5V output, 17μA quiescent current, 100% duty-cycle dropout capability, PG open-drain indicator with ±10% trip window, and compatibility with ceramic input/output capacitors only - no external inductor or compensation required.

Technical Context

The MPM3810GQB-25-Z implements a constant-on-time (COT) control architecture with input-voltage feedforward, enabling stable ~3.5MHz switching across 2.5V–6V input and 2.5V output while minimizing loop compensation complexity. Its internal 0.47μH inductor and matched 100mΩ/60mΩ P/N-FET pair are co-optimized for low-loss operation up to 1.2A peak load.

It integrates EN logic-level enable (1.2V high threshold), open-drain PG with 550kΩ internal pull-up and 0.4V sink capability at 1mA, and proprietary light-load DCM control that disables the low-side FET upon inductor current reversal - reducing IQ to 17μA without compromising startup or regulation integrity.

Key Specifications

Pinout & Package

MPM3810GQB-25-Z uses a thermally enhanced QFN-12 package (2.5mm × 3.0mm × 0.9mm) with an exposed PGND pad for efficient heat dissipation. Pin functions are validated per MPS datasheet Rev. 1.1 (2014).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output step-down module applications.

Compared with TPS826712SIPR and RT6220HGQW, the MPM3810GQB-25-Z uniquely combines fixed 2.5V output, integrated OUT_S sensing, PG indicator, and 1.2A capability in a 2.5mm × 3.0mm footprint - making it optimal for space- and sequencing-sensitive 2.5V I/O systems.

Availability

MPM3810GQB-25-Z is available at Aetrix Electronics and suitable for solid-state drive (SSD) power, portable instrumentation, FPGA I/O rails, and space-constrained industrial sensor nodes requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MPM3810GQB-25-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 over two decades of leadership in integrated power modules and DC-DC conversion.

The MPM3810 product line delivers fully integrated, small-footprint step-down modules targeting portable, storage, and space-constrained embedded systems - emphasizing ease of use, thermal efficiency, and minimal external component count.

FAQ

What is the minimum input voltage required for MPM3810GQB-25-Z to regulate 2.5V output?

The device requires a minimum input voltage of 2.5V to sustain regulation due to its 100% duty-cycle capability. Below 2.5V, output drops linearly with input; UVLO threshold is 2.15V (rising), so operation ceases entirely below that level. This makes it compatible with discharged single-cell Li-ion batteries down to 2.5V.

Does MPM3810GQB-25-Z require external feedback resistors?

No - MPM3810GQB-25-Z is a fixed-output variant with internal feedback network set to 2.5V. Pin 10 is marked NC (no connect) and must remain unconnected. Only input and output ceramic capacitors are required for basic operation.

How does the OUT_S pin improve regulation accuracy?

OUT_S provides remote output voltage sensing at the load point, compensating for voltage drop across PCB traces between the module's OUT pin and the actual load. This maintains ±2.5% output accuracy even with 100mΩ trace resistance at 1.2A load - critical for precision I/O rails.

Can MPM3810GQB-25-Z operate without the PG pin connected?

Yes - PG is an open-drain output with internal 550kΩ pull-up to VIN. Leaving it unconnected defaults to high-impedance state; the device regulates normally. However, power sequencing and fault detection require external pull-up and monitoring of PG voltage transitions.

What is the maximum allowable ambient temperature for continuous 1.2A operation?

At TA = +70°C on a standard 4-layer PCB (JESD51-7), the module's θJA = 65°C/W yields a junction rise of 84.5°C (1.2A² × 0.22Ω × 65°C/W ≈ 20.5°C conduction + 64°C switching). With TJ(max) = 150°C, this allows safe continuous operation - derating begins above +85°C ambient.

Is thermal pad soldering required for MPM3810GQB-25-Z?

Yes - the exposed thermal pad (pins 3,4) must be soldered to a dedicated PGND copper pour with ≥4 thermal vias (0.3mm diameter) to inner ground layers. Omitting this reduces θJA by >25°C/W and risks thermal shutdown under 1A load at +60°C ambient.

What capacitor values are recommended for stable operation?

MPS specifies 10μF X5R/X7R ceramic for input and 20μF for output in typical applications. For 2.5V output, 22μF input is advised if VIN approaches 6V to suppress ripple; output capacitance may be reduced to 10μF if load transients are infrequent and ESR <5mΩ.