Monolithic Power Systems Inc. EV1479-TF-00A

Overview

EV1479-TF-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP1479GTF synchronous step-down converter, delivering 1A continuous output at 3.3V from a 4.2–18V input, operating at 800kHz with internal 140mΩ/60mΩ MOSFETs and constant-on-time control for fast transient response in security camera power supplies.

For engineers reviewing the EV1479-TF-00A datasheet, EV1479-TF-00A pinout, EV1479-TF-00A application, or EV1479-TF-00A equivalent, this board enables rapid validation of MP1479-based 3.3V/1A DC-DC designs under real load transients, thermal shutdown, and enable-controlled startup/shutdown sequences per Rev.1.0 test reports.

Technical Context

The EV1479-TF-00A implements the MP1479GTF IC in a fixed 3.3V output configuration using a 4.7µH inductor (Wurth 744316470), 22µF/25V and 22µF/16V ceramic output capacitors, and precision feedback resistors (R1=40.2kΩ, R2=13kΩ) to set VOUT=3.3V via the 0.8V reference.

It supports full functional testing including enable-controlled sequencing (EN threshold: 1.3V turn-on, <1V turn-off), short-circuit hiccup protection, thermal shutdown recovery, and load-step response from 0.5A to 1A with <50mV AC ripple measured at VIN=12V, TA=25°C.

Key Specifications

Availability

EV1479-TF-00A is available at Aetrix Electronics and suitable for security camera power design, digital set-top box auxiliary rails, and flat-panel display logic supply applications requiring stable component supply and fast DC-DC validation cycles.

Supply support for EV1479-TF-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 over two decades of expertise in DC-DC conversion and power management solutions.

The MP1479 product line targets space-constrained, high-efficiency point-of-load applications such as surveillance systems and consumer displays, emphasizing minimal external components and robust protection in SOT563 packaging.

FAQ

What input voltage range is validated on the EV1479-TF-00A?

The board is tested and characterized across 5V, 12V, and 18V input conditions per Rev.1.0 test report. It supports the full MP1479 operating range of 4.2V–18V, with efficiency curves and ripple measurements provided for each voltage at 3.3V/1A output.

How is output voltage set, and can it be adjusted?

VOUT is fixed at 3.3V using R1=40.2kΩ and R2=13kΩ to divide the FB node to the 0.8V internal reference. The board supports adjustment down to 0.8V by replacing R1/R2; no solder jumpers or DIP switches are required-only resistor changes per the MP1479 datasheet.

Does the board implement enable control, and what are the thresholds?

Yes-EN functionality is brought out to a test pad. Driving EN ≥1.3V enables regulation; driving EN ≤1V disables it. Startup/shutdown timing waveforms (1ms/div) and transient behavior under enable control are documented in Sections 4–5 of the reference design report.

What protection features are demonstrated and verified?

All MP1479-integrated protections are validated: over-current protection with hiccup mode, thermal shutdown with recovery, undervoltage lockout, and short-circuit response. Oscilloscope captures of short-circuit entry/recovery and thermal shutdown events are included in Figures 12–13.

Which inductor and output capacitors are used, and why?

Wurth 744316470 (4.7µH, DCR=24.5mΩ, Isat=4.7A) and Murata GRM21BR61E226ME44L (22µF/25V X5R) are selected to meet ripple, saturation, and thermal performance targets at 1A/800kHz. Their values match MP1479 recommended design guidelines for stability and efficiency.

Is the board RoHS-compliant and lead-free?

Yes-EV1479-TF-00A uses only RoHS-compliant, lead-free, halogen-free components per MPS green policy. All listed BOM parts (e.g., Murata GRM series, Yageo RC0603, Wurth 744316470) carry appropriate compliance certifications as published on respective manufacturer websites.