Monolithic Power Systems Inc. MPM3810GQB-33-P

Overview

MPM3810GQB-33-P from Monolithic Power Systems is a fixed-output 3.3V, 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 to 6V input, delivers ±3% output accuracy at 10mA, features constant-on-time control for fast transient response, and includes power good (PG), enable (EN), thermal shutdown, and hiccup-mode short-circuit protection - ideal for space-constrained portable SSDs and low-voltage I/O rails.

For engineers reviewing the MPM3810GQB-33-P datasheet, MPM3810GQB-33-P pinout, MPM3810GQB-33-P application, or MPM3810GQB-33-P equivalent, key selection criteria include its fixed 3.3V output, 17μA quiescent current, 100% duty-cycle dropout capability, PG open-drain indicator with ±10% regulation window, and minimal external component count (only input/output capacitors required).

Technical Context

The MPM3810GQB-33-P implements a constant-on-time (COT) control architecture with input voltage feed-forward, enabling stable ~3.5MHz switching across 2.5–6V input and 3.3V output while minimizing loop compensation complexity. Its internal 0.47μH inductor and matched 100mΩ/60mΩ P/N-channel MOSFETs form a complete power stage optimized for high efficiency in discontinuous and continuous conduction modes.

Protection logic integrates cycle-by-cycle current limiting (2.1A typ), thermal shutdown at 150°C with 30°C hysteresis, and hiccup-mode recovery during sustained overloads or short circuits. The PG pin provides a VIN-referenced open-drain signal with 550kΩ internal pull-up, asserting high only when FB voltage remains within ±10% of 0.6V reference - directly tied to output regulation integrity.

Key Specifications

Pinout & Package

MPM3810GQB-33-P uses a thermally enhanced QFN-12 package (2.5mm × 3.0mm × 0.9mm) with exposed thermal pad connected to PGND pins 1 and 2. The layout prioritizes low-inductance high-current paths: VIN (pin 7), OUT (pins 5–6), and PGND (pins 1–2) are positioned for direct copper pour connection. Pins 3–4 are internal SW pads tied to thermal pad; pin 12 (OUT_S) supports remote sensing for improved load regulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSM1033-3.3 and RT6220BGQW, MPM3810GQB-33-P uniquely combines PG/EN sequencing, remote sensing (OUT_S), and ultra-low 17μA IQ in the smallest 2.5×3.0mm footprint - making it optimal for battery-powered, space-limited, and multi-rail systems demanding precise power control.

Availability

MPM3810GQB-33-P is available at Aetrix Electronics and suitable for SSD controller power, portable instrument I/O rails, space-constrained industrial sensors, and low-voltage DSP core supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MPM3810GQB-33-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MPM3810 product line delivers fully integrated, compact DC-DC modules targeting space- and efficiency-critical applications in portable electronics, storage, and industrial edge devices - emphasizing ease of design, thermal robustness, and minimal external component count.

FAQ

What is the minimum input voltage required for MPM3810GQB-33-P to regulate 3.3V output?

The device requires a minimum input voltage of 2.5V to maintain regulation. Its 100% duty-cycle capability allows operation down to VIN = VOUT, meaning it sustains 3.3V output even when input drops to exactly 3.3V - critical for Li-ion battery applications nearing end-of-discharge.

Does MPM3810GQB-33-P require external feedback resistors?

No. As a fixed-output variant, MPM3810GQB-33-P has internal feedback circuitry set to 3.3V. Pin 10 is marked NC (no connect) and must remain unconnected; only input and output ceramic capacitors are needed for full operation.

How does the Power Good (PG) pin behave during startup and fault conditions?

PG asserts high (pulled to VIN via internal 550kΩ resistor) only after output reaches and remains within ±10% of 3.3V for ≥50μs. During startup, it stays low until regulation is achieved; during overcurrent or thermal faults, it pulls low immediately to signal loss of regulation.

Can MPM3810GQB-33-P operate without the OUT_S (pin 12) connection?

Yes. OUT_S is optional for remote sensing. If unused, connect it directly to the OUT pin (pins 5–6). Omitting remote sensing results in standard load regulation (±3% at 10mA), while using OUT_S improves accuracy under high-current PCB trace resistance.

What thermal management practices are recommended for 1.2A continuous operation?

For sustained 1.2A loads, solder the exposed thermal pad (pins 3–4) to a ≥40mm² internal or bottom-side copper pour with ≥4 thermal vias (0.3mm diameter) to inner ground planes. With this, the device maintains ≤125°C junction temperature at +70°C ambient per θJA = 65°C/W rating.

Is the MPM3810GQB-33-P RoHS compliant and lead-free?

Yes. All MPS parts, including MPM3810GQB-33-P, are lead-free and fully compliant with the EU RoHS directive. Full green status documentation, including material declarations and test reports, is available on the Monolithic Power Systems website under Products > Quality Assurance.