Monolithic Power Systems Inc. EV2269-D-00A

Overview

EV2269-D-00A from Monolithic Power Systems is an evaluation board for the MP2269GD synchronous step-down converter, demonstrating a 30V-input, 1A-output, low-quiescent-current DC/DC solution with programmable 350kHz–2.5MHz switching frequency, 3.3V fixed output, and integrated 180mΩ/80mΩ MOSFETs-used to validate power delivery in battery-powered and wide-input industrial systems.

For engineers reviewing the EV2269-D-00A datasheet, EV2269-D-00A pinout, EV2269-D-00A application, or EV2269-D-00A equivalent, this board enables rapid validation of MP2269GD's load regulation, soft-start behavior, power-good signaling, hiccup-mode OCP, and forced-PWM/auto-PFM mode selection under real-world thermal and transient conditions.

Technical Context

The EV2269-D-00A implements the MP2269GD IC in a fully assembled QFN15 (2mm×3mm) layout with 6.5µH shielded inductor, input/output ceramic capacitors, and precision feedback resistors (R1=1MΩ, R2=324kΩ) to deliver 3.3V at up to 1A from 12V input. It supports external soft-start via capacitor on SS pin and power-good monitoring via open-drain PG pin.

Board-level design includes BIAS pin tied to VOUT for optimal light-load efficiency, MODE pin grounded to enable auto PFM/PWM operation, and EN pin accessible for digital enable/disable control-enabling direct evaluation of low-I_Q (12µA sleep, 1µA shutdown) performance across line and load transients.

Key Specifications

Availability

EV2269-D-00A is available at Aetrix Electronics and suitable for battery-powered systems, smart home hubs, wide-input industrial controllers, and standby power supply designs requiring stable component supply, fast prototyping cycles, and production-ready reference validation.

Supply support for EV2269-D-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP2269 product line targets ultra-low-I_Q synchronous buck converters for energy-sensitive applications including portable instrumentation, IoT edge nodes, and always-on subsystems requiring sub-15µA quiescent current and robust hiccup-mode fault recovery.

FAQ

What input voltage range is supported on the EV2269-D-00A board?

The board is designed to operate from 3.3V to 30V input, with test data and layout optimized for 12V nominal input. The MP2269GD IC itself maintains regulation across this full range, and the board's input capacitor selection (22µF ×2, 16V X5R) supports transient handling up to 30V with margin.

How is the 3.3V output voltage set and can it be adjusted?

The output is set by the R1/R2 feedback divider (1MΩ and 324kΩ), yielding 3.3V per the MP2269GD's 0.8V reference. Output voltage can be reconfigured by replacing R1 and R2 per the datasheet's V_OUT = 0.8V × (1 + R1/R2) equation; no PCB modification is required beyond resistor replacement.

Does the board support forced PWM mode, and how is it enabled?

Yes - forced PWM mode is enabled by pulling the MODE pin high (≥2.0V). On this board, MODE is pulled to GND by default for auto PFM/PWM operation; users can lift the MODE jumper or drive the pin externally to activate continuous PWM conduction for noise-sensitive applications.

What is the purpose of the BIAS pin, and how is it configured on this board?

The BIAS pin supplies internal LDO bias for improved light-load efficiency. On EV2269-D-00A, BIAS is connected to VOUT, enabling optimal efficiency down to microamp loads. Disconnecting BIAS from VOUT and tying it to VIN reduces light-load I_Q trade-off but increases dropout sensitivity.

Is the power-good (PG) signal active-high or open-drain, and what threshold triggers it?

The PG pin is open-drain and asserts low when VOUT drops below 90% of target (i.e., <2.97V for 3.3V output). It requires an external pull-up (not populated by default); users must add a pull-up resistor (e.g., 10kΩ to VOUT) to generate a logic-high OK signal during valid regulation.

Can the board be used to evaluate thermal performance, and what layout features support this?

Yes - the board uses 2oz copper layers, thermal vias under the MP2269GD QFN15 package, and a compact 6.5µH shielded inductor to enable meaningful thermal testing. Measured temperature rise is ≤25°C at 1A/12V→3.3V in still air, validating thermal design for derating analysis.