Monolithic Power Systems Inc. EV21148-QD-00B

Overview

EV21148-QD-00B from Monolithic Power Systems is a 1A synchronous step-down DC/DC converter evaluation board based on the MP21148GQD IC, featuring 2.2MHz switching frequency, 2.3V–5.5V input range, and fixed 1.2V output in an ultra-small 1.0mm×1.5mm QFN-6 package. It delivers high efficiency across load currents up to 1A and supports power sequencing via EN pin.

For engineers reviewing the EV21148-QD-00B datasheet, EV21148-QD-00B pinout, EV21148-QD-00B application, or EV21148-QD-00B equivalent, this board enables rapid validation of MP21148GQD performance in portable power rails, low-voltage I/O systems, and battery-powered devices requiring compact, stable 1.2V supply with fast transient response.

Technical Context

The EV21148-QD-00B implements the MP21148GQD's Constant-On-Time (COT) control architecture, enabling sub-10µs load transient recovery without external compensation. It operates with internal 120mΩ/80mΩ MOSFETs and supports 100% duty cycle for ultra-low dropout operation.

This board integrates a 1.0µH power inductor (PIFE25201B-1R0MS), dual 10µF X5R ceramic output capacitors, and precision 1% feedback resistors (R1=R2=200kΩ) to deliver regulated 1.2V at up to 1A with <20mV peak-to-peak output ripple under steady-state conditions.

Key Specifications

Availability

EV21148-QD-00B is available at Aetrix Electronics and suitable for portable device power validation, wireless card reference design, and battery-powered system prototyping requiring stable component supply and fast-turn evaluation support.

Supply support for EV21148-QD-00B 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 innovation in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP21148 product line targets ultra-compact, high-efficiency point-of-load regulation in space- and power-sensitive applications such as mobile SoCs, wearables, and IoT edge nodes.

FAQ

What is the default output voltage of the EV21148-QD-00B board?

The board is configured for a fixed 1.2V output using matched 200kΩ feedback resistors (R1 and R2), per the MP21148GQD typical application circuit. This setting complies with common core voltage requirements for low-power DSPs and microcontrollers.

Can the output voltage be adjusted, and how?

Yes - VOUT is adjustable down to 0.6V by modifying the R1/R2 feedback network. For example, setting R1 = 200kΩ and R2 = 100kΩ yields 1.8V output. The board includes footprints for both resistors and supports external resistor placement without solder bridge removal.

Does the board support power sequencing via the EN pin?

Yes - the EN pin is routed to a test point and supports clean power-up/down sequencing with external logic-level control. The board includes no pull-up/pull-down on EN, allowing full flexibility for system-level enable timing control.

What inductor is used on the EV21148-QD-00B board?

The board uses a CYNTEC PIFE25201B-1R0MS 1.0µH shielded power inductor rated for 3.8A saturation current and 45mΩ DCR, optimized for high efficiency and minimal thermal rise at 1A load.

Is the MP21148GQD IC on this board lead-free and RoHS-compliant?

Yes - the MP21148GQD IC is lead-free, halogen-free, and fully RoHS 2011/65/EU compliant. MPS confirms green status per its Quality Assurance documentation, and the board uses only RoHS-compliant passives and PCB materials.

How is output stability ensured with ceramic capacitors?

The board uses two 10µF/10V X5R ceramic capacitors (Murata GRM21BR61A106KE19L) in parallel at the output, leveraging the MP21148GQD's inherent stability with low-ESR ceramics and eliminating need for electrolytic or tantalum alternatives.