Monolithic Power Systems Inc. MPM3810GQB-33-Z

Overview

MPM3810GQB-33-Z 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, operating from 2.5V–6V input. It uses constant-on-time (COT) control for fast transient response, delivers ±3% output accuracy at 10mA load, features power-good (PG) monitoring and enable (EN) control, and targets space-constrained portable and embedded power rails.

For engineers reviewing the MPM3810GQB-33-Z datasheet, MPM3810GQB-33-Z pinout, MPM3810GQB-33-Z application, or MPM3810GQB-33-Z equivalent, key selection criteria include its QFN-12 (2.5×3.0×0.9 mm) footprint, 17μA quiescent current, 100% duty-cycle dropout capability, thermal shutdown at 150°C, and PG logic compatibility with 550kΩ internal pull-up.

Technical Context

The MPM3810GQB-33-Z implements a monolithic synchronous buck architecture with integrated 0.47μH inductor and dual MOSFETs (100mΩ P-FET, 60mΩ N-FET), eliminating external magnetics. Its COT control loop uses VIN feed-forward to maintain stable 2.8–4.2MHz switching frequency across input and output conditions.

It integrates EN logic-level interface (1.2V high threshold), open-drain PG with ±10% regulation window and 50μs delay, soft-start (1.5ms ramp), cycle-by-cycle current limiting (~2.1A), hiccup-mode short-circuit protection, and thermal shutdown with 30°C hysteresis - all in a single compact module.

Key Specifications

Pinout & Package

MPM3810GQB-33-Z is housed in a thermally enhanced QFN-12 package (2.5mm × 3.0mm × 0.9mm) with exposed thermal pad (pins 3–4 connected internally to SW node and tied to copper pour for heat dissipation). The package supports reflow soldering per JEDEC J-STD-020 and achieves θJA = 65°C/W on a 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS826713 and LTM8003-3.3, the MPM3810GQB-33-Z uniquely balances 1.2A capability, 2.5V minimum input, sub-1mm profile, and 17μA IQ - making it optimal for portable, battery-powered, and space-limited 3.3V point-of-load designs.

Availability

MPM3810GQB-33-Z is available at Aetrix Electronics and suitable for portable instrumentation, SSD/HDD power management, and space-constrained industrial controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPM3810GQB-33-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 DC-DC conversion, motor drivers, and LED lighting solutions.

The MPM3810 product line delivers fully integrated, compact power modules targeting portable, battery-operated, and space-constrained embedded systems - emphasizing ease of design, minimal external components, and robust protection.

FAQ

What is the recommended input capacitor for MPM3810GQB-33-Z?

A 10µF X5R/X7R ceramic capacitor placed within 1mm of VIN and PGND is recommended for most applications. For higher output voltages or noisy environments, a 22µF unit improves stability. The capacitor must handle ≥0.6A RMS ripple current, calculated as I_LOAD/2 at VIN = 2×VOUT.

Does MPM3810GQB-33-Z require external feedback resistors?

No. As a fixed-output variant, MPM3810GQB-33-Z has internal feedback set to 3.3V. Pin 10 (FB) is NC and must remain unconnected. Only input and output capacitors are required for basic operation - no resistor divider needed.

How does the power-good (PG) pin behave during startup and fault conditions?

PG is an open-drain output pulled up to VIN via a 550kΩ internal resistor. It asserts high after soft-start completes and VOUT remains within ±10% of 3.3V for ≥50μs. If VOUT falls outside this window - due to overload, short, or input dropout - PG is actively pulled low.

Can MPM3810GQB-33-Z operate with input voltage equal to output voltage?

Yes. Its 100% duty-cycle capability allows continuous conduction down to VIN = VOUT = 3.3V. This supports seamless operation during Li-ion battery discharge from 4.2V to 3.3V without dropout or regulation loss - critical for battery longevity.

What thermal design guidance applies to the QFN-12 package?

The exposed thermal pad (pins 3–4) must be soldered to a ≥25mm² copper pour connected to internal ground planes via ≥4 thermal vias (0.3mm diameter). This achieves the rated θJA = 65°C/W. Without proper thermal land, junction temperature may exceed 150°C at full 1.2A load.

Is remote sensing (OUT_S) mandatory for accurate regulation?

No. OUT_S is optional. Connect it directly to the load for improved load regulation under PCB trace resistance (>50mΩ). If omitted, regulation occurs at the OUT pin - sufficient for short-trace, low-current applications like microcontroller I/O rails.

What happens during a short-circuit event?

Upon current-limit detection (~2.1A), MPM3810GQB-33-Z enters hiccup mode: it disables switching, discharges the soft-start capacitor, waits ~10ms, then attempts restart. This cycle repeats until the short clears, preventing thermal damage and enabling autonomous recovery.