Monolithic Power Systems Inc. MPM3814CGPA-P

Overview

MPM3814CGPA-P 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 in space-constrained optical modules and FPGA core rails.

For engineers reviewing the MPM3814CGPA-P datasheet, MPM3814CGPA-P pinout, MPM3814CGPA-P application, or MPM3814CGPA-P equivalent, key selection criteria include its ECLGA-14 (2.5mm×2.5mm) ultra-small footprint, COT control for fast transient response, thermal shutdown at 150°C, and guaranteed 92.3% efficiency at 3.3V→1.8V/1A.

Technical Context

The MPM3814CGPA-P uses constant-on-time (COT) control with input voltage feed-forward to maintain stable ~2.2MHz switching frequency across input and output variations. Its internal 1µH inductor and dual-MOSFET synchronous rectifier eliminate external magnetics and reduce BOM count to only four passive components.

It implements cycle-by-cycle over-current protection with 1.6A peak P-channel and 1.5A valley N-channel current limits, plus hiccup-mode short-circuit protection triggered after ~64 consecutive current-limit cycles. The separate AGND and PGND pins require single-point PCB connection to minimize noise coupling into the 600mV ±9mV feedback reference.

Key Specifications

Pinout & Package

ECLGA-14 package: 2.5mm × 2.5mm × 1.2mm ultra-small surface-mount land-grid array with exposed thermal pad on bottom. Requires solder paste stencil design per JEDEC MO-303 standard and single-point AGND/PGND connection on PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS82671 and LTM8071, the MPM3814CGPA-P uniquely balances 1A capability, 2.5mm² footprint, PG signaling, and 2.2MHz operation-making it optimal for optical, FPGA, and portable storage where space, noise, and sequencing integrity are co-constrained.

Availability

MPM3814CGPA-P is available at Aetrix Electronics and suitable for FPGA core rails, optical transceiver power supplies, and portable SSD controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPM3814CGPA-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 power management ICs and modules, headquartered in Kirkland, Washington.

The MPM3814C product line delivers ultra-small, high-efficiency DC/DC power modules targeting space-constrained, noise-sensitive applications including optical networking, portable computing, and embedded AI edge devices.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MPM3814CGPA-P requires a minimum 10µF ceramic output capacitor rated for ≥2.5V, but 22µF X5R/X7R is recommended for full 1A load stability and ≤5mV ripple. Capacitor ESR must be <10mΩ at 2.2MHz; using two 10µF 0402 caps in parallel meets this while improving thermal derating.

Can the MPM3814CGPA-P operate without the OUT_S pin connected?

Yes-the OUT_S pin is optional for remote sensing. If unused, connect it directly to the OUT pin. Omitting OUT_S degrades load regulation from ±0.1% to ±0.2% across 0–1A, but maintains full functionality for non-critical applications like sensor hubs.

How does the EN pin behave during input voltage ramp-up?

The EN pin has an internal 100kΩ pull-down and activates when VIN exceeds 2.5V UVLO threshold and EN voltage rises above 1.2V. This ensures the device remains disabled until both input rail and enable signal are valid, preventing erratic startup in multi-rail systems.

What thermal performance can be expected on a 2-layer PCB?

On a standard 5.1cm×5.1cm 2-layer board with 2oz copper, θJA is 56.7°C/W. At 1A/1.2V output (1.2W dissipation), junction temperature rise is ~68°C above ambient-keeping TJ <125°C at TA ≤57°C. Adding thermal vias under the exposed pad reduces θJA by ~15°C/W.

Is the SW pin electrically accessible for probing or filtering?

No-the SW pin (Pin 1) is an internal switch-node test pad and must remain unconnected per datasheet. Probing or adding capacitance here disrupts COT timing and risks instability. All switching waveform analysis must be done at the OUT or IN nodes with high-bandwidth differential probes.

Does the PG pin require an external pull-up resistor?

No-the PG pin has an internal 440kΩ pull-up to IN, eliminating external components. It sinks current when FB is out-of-regulation (±7%/−12%), pulling PG low; otherwise, it floats high to IN. Driving PG into a microcontroller GPIO requires no series resistor for 3.3V/5V logic compatibility.

What is the maximum allowable input voltage transient?

The absolute maximum rating allows 10ns pulses up to +10V on IN pins, but sustained operation above 6.5V damages the IC. For automotive or industrial inputs with >6V surges, add a TVS diode (e.g., SMAJ5.0A) between IN and PGND with <100ps response time and clamping <6.5V.