Monolithic Power Systems Inc. MPM3814CGPA-Z

Overview

MPM3814CGPA-Z from Monolithic Power Systems is a synchronous step-down power module with integrated inductor, delivering 1A continuous output current across a 2.75V–6V input range and regulating output down to 0.6V. It operates in forced continuous conduction mode (FCCM), achieves ≤5mV output ripple with one 22µF ceramic capacitor, and features EN/PG pins for precise power sequencing-ideal for FPGA core rails and optical transceiver biasing.

For engineers reviewing the MPM3814CGPA-Z datasheet, MPM3814CGPA-Z pinout, MPM3814CGPA-Z application, or MPM3814CGPA-Z equivalent, key selection criteria include its ultra-small ECLGA-14 (2.5mm×2.5mm) footprint, COT control for <36mV load transient deviation, thermal shutdown at 150°C, and support for LDO replacement in space-constrained portable systems.

Technical Context

The MPM3814CGPA-Z employs constant-on-time (COT) control with input voltage feed-forward, maintaining ~2.2MHz switching frequency across VIN = 2.75V–6V and VOUT = 0.6V–6V. Its integrated 1µH inductor and internal high-side P-channel / low-side N-channel MOSFETs enable full regulation without external magnetics.

Power sequencing is supported via active-high EN with 1.2V logic threshold and open-drain PG with ±7%/−12% trip thresholds referenced to FB voltage. Protection includes cycle-by-cycle OCP (1.6A peak / 1.5A valley), hiccup-mode SCP, and thermal shutdown with 30°C hysteresis.

Key Specifications

Pinout & Package

ECLGA-14 package (2.5mm × 2.5mm × 1.2mm) with exposed thermal pad on bottom; requires solder paste stencil aperture matching JEDEC MO-303 land pattern.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSM10501S and RT6220EGJ6F, the MPM3814CGPA-Z uniquely balances ultra-small size, integrated magnetics, FCCM low-noise operation, and remote sensing - making it optimal for optical modules and space-constrained FPGA core supplies where ripple, footprint, and ease of design are co-prioritized.

Availability

MPM3814CGPA-Z is available at Aetrix Electronics and suitable for FPGA core supplies, optical transceiver biasing, and SSD controller power requiring stable component supply, full reel (2500 pcs) traceability, and guaranteed long-term availability through MPS's qualified product lifecycle program.

Supply support for MPM3814CGPA-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 and modules, headquartered in Kirkland, WA, with global design and support centers.

The MPM3814C series targets ultra-compact, low-noise DC-DC conversion for next-generation optical interconnects, portable computing, and storage subsystems - emphasizing integration, thermal robustness, and simplified system-level design.

FAQ

What is the recommended input capacitor value and type for MPM3814CGPA-Z?

A 22µF X5R or X7R ceramic capacitor placed within 2mm of IN and PGND pins is recommended. The capacitor must have ≥1.5A RMS ripple current rating and low ESR (<10mΩ). For VIN < 3.3V, add a second 10µF ceramic capacitor in parallel to maintain stability under high di/dt conditions.

Can MPM3814CGPA-Z operate with 100% duty cycle, and what is the dropout resistance?

Yes, it supports 100% duty cycle operation with a measured dropout resistance of 105mΩ. This enables regulation down to VOUT ≈ VIN − (IOUT × 105mΩ), allowing stable 3.3V output from a 3.6V input at full 1A load without dropout-induced brownout.

How does the OUT_S pin improve regulation accuracy, and when should it be used?

OUT_S provides remote voltage sensing at the load point, compensating for IR drop across PCB traces. It should be used when load current exceeds 500mA or trace length exceeds 10mm - connecting directly to the FPGA/ASIC VDD pin improves load regulation from ±0.15% to ±0.05% across 0–1A.

What is the soft-start time, and can it be adjusted externally?

The internal soft-start time is fixed at 1.7ms (typical) and cannot be adjusted externally. This ensures controlled VOUT ramp-up to prevent inrush current and overshoot during FPGA configuration or optical module initialization without requiring external timing components.

Does MPM3814CGPA-Z require a minimum load to maintain regulation?

No minimum load is required. The device maintains regulation from 0A to 1A in FCCM mode, with load regulation specified as ±0.15% across full range. This enables use in always-on subsystems like real-time clocks or sensor wake-up circuits without dummy loads.

What is the thermal performance on a standard 2-layer PCB?

On a 5.1cm×5.1cm, 2-layer, 2oz copper evaluation board, θJA is 56.7°C/W. At 1A load and 25°C ambient, junction temperature rises ~35°C - well below the 150°C shutdown threshold. Adding thermal vias under the exposed pad reduces θJA by ~15°C/W in production layouts.

Is the PG pin compatible with 1.8V logic systems?

Yes. PG is an open-drain output with internal 440kΩ pull-up to IN. When IN = 3.3V, PG logic-high voltage is ~3.0V - sufficient to drive 1.8V GPIOs with external level-shifting or direct connection if the host MCU accepts 3.3V-tolerant inputs.