Monolithic Power Systems Inc. EV2172C-Q-00A

Overview

EV2172C-Q-00A from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 75mΩ high-side and 45mΩ low-side MOSFETs, delivering up to 2A continuous output current from a 2.5V–5.5V input, fixed 1.2V output, and 1.1MHz switching frequency. It features output discharge, overvoltage protection, hiccup-mode short-circuit protection, and operates in forced PWM mode for consistent noise control in portable power rails.

For engineers reviewing the EV2172C-Q-00A datasheet, EV2172C-Q-00A pinout, EV2172C-Q-00A application, or EV2172C-Q-00A equivalent, this device is selected for compact, low-noise, high-efficiency point-of-load regulation in battery-powered systems where fast transient response, thermal robustness, and controlled startup/shutdown sequencing are critical.

Technical Context

The EV2172C-Q-00A implements a constant-on-time (COT) control architecture optimized for rapid load transient response without external compensation. Its internal power stage supports 100% duty-cycle operation for ultra-low dropout and integrates output discharge via an internal NMOS switch tied to the FB node.

It operates exclusively in forced PWM mode-eliminating mode-hopping noise-and includes EN-controlled sequencing, power-good indication (for fixed-output version), and thermal shutdown with automatic recovery. Input undervoltage lockout (UVLO) and cycle-by-cycle current limiting provide robust fault handling under dynamic load and supply conditions.

Key Specifications

Pinout & Package

The EV2172C-Q-00A is housed in a 12-pin, 2mm × 2mm UTQFN package with 0.4mm pitch and exposed thermal pad (EP) on the bottom for enhanced heat dissipation. Pin numbering follows standard UTQFN convention with EP connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MP2172CGQFU, EV2172C-Q-00A offers identical performance but is designated for evaluation use only; versus TPS62172DRCT, it provides superior transient response, integrated discharge, and deterministic noise profile-critical for portable and RF-dense systems.

Availability

EV2172C-Q-00A is available at Aetrix Electronics and suitable for wireless networking cards, portable instrumentation, and battery-powered medical sensors requiring stable component supply, rapid design validation, and verified reference layouts.

Supply support for EV2172C-Q-00A 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 expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2172 product line delivers compact, high-efficiency synchronous buck converters for space- and noise-constrained portable and embedded applications-designed to replace linear regulators and legacy buck solutions in next-generation low-voltage systems.

FAQ

What is the function of the DIS pin on EV2172C-Q-00A?

The DIS terminal is internally tied high and enables the integrated output discharge FET. When EN is deasserted, DIS activates an internal NMOS switch between VOUT and GND, rapidly discharging the output capacitor to prevent floating voltages and ensure safe power-down sequencing in multi-rail systems.

Does EV2172C-Q-00A support adjustable output voltage?

No-EV2172C-Q-00A is configured for fixed 1.2V output. The underlying MP2172CGQFU IC supports adjustable output down to 0.6V via external resistor divider on FB, but this evaluation board variant uses internal feedback and no external resistors, locking VOUT at 1.2V.

What thermal considerations apply to the UTQFN package?

The 2mm × 2mm UTQFN package requires a minimum 12mm² copper thermal pad connected to a solid internal or bottom-layer ground plane. Thermal resistance θ_JA is 65°C/W with 2-layer board; adding thermal vias (≥6×0.3mm) under the EP reduces θ_JA to ~42°C/W, enabling 2A operation up to +65°C ambient.

Is power-good (PG) active during startup and fault conditions?

PG asserts high only when VOUT reaches and remains within ±7.5% of 1.2V for ≥1ms. It remains low during startup ramp-up, UVLO, thermal shutdown, or output short-circuit-providing reliable system-level power sequencing and fault detection without external monitoring.

Can EV2172C-Q-00A operate with input voltage below 3.3V?

Yes-VIN may range from 2.5V to 5.5V. However, at VIN < 3.3V, the input capacitor value should be increased beyond the default 22μF to maintain stability under high di/dt load steps, as noted in the datasheet's application guidance.

What is the purpose of separate AGND and PGND pins?

AGND provides a quiet reference for the feedback amplifier and control circuitry; PGND carries high-frequency, high-current return paths for the power switches. Separating them minimizes noise coupling into the regulation loop-critical for maintaining ±1% output accuracy and stable COT operation.

How does forced PWM mode improve system-level EMI performance?

Forced PWM eliminates frequency modulation inherent in PFM or auto-mode converters, resulting in narrowband, predictable switching harmonics. This simplifies EMI filter design, improves repeatability in compliance testing, and avoids audible coil whine in portable devices.