Monolithic Power Systems Inc. EV8904DD-00A

Overview

EV8904DD-00A from Monolithic Power Systems is an evaluation board for the MP8904 500mA low-dropout linear regulator, designed to demonstrate adjustable low-voltage regulation (0.5V–5V) with 300mV dropout at full load, 2% feedback accuracy, and integrated thermal/current protection. It supports battery-powered mobile devices requiring stable sub-1.8V core supply under 2.5V–6.5V input.

For engineers reviewing the EV8904DD-00A datasheet, EV8904DD-00A pinout, EV8904DD-00A application, or EV8904DD-00A equivalent, this board enables rapid validation of MP8904's low-ESR ceramic capacitor stability, 100μA ground current efficiency, and enable-controlled power sequencing in space-constrained portable designs.

Technical Context

The EV8904DD-00A implements a fully assembled, tested reference design for the MP8904 LDO - a monolithic IC featuring a 0.5V internal reference, bias-supply separation (2.5V–6.5V VBIAS), and direct VIN-to-VOUT power path. Its circuit topology isolates reference generation from output regulation to maintain accuracy across load and line variations.

It validates key MP8904 behaviors: stable operation with 2.2µF/4.7µF X7R ceramics (C1/C2), 1nF bypass on VREF (C3), and resistor-programmed output using R1=26.1kΩ and R2=10kΩ for 1.8V default. EN pin logic thresholds (1.2V turn-on / 0.4V turn-off) are hardware-verified per schematic.

Key Specifications

Availability

EV8904DD-00A is available at Aetrix Electronics and suitable for low-power portable electronics development, battery management system prototyping, and embedded microcontroller power architecture validation requiring stable component supply and documented reference design fidelity.

Supply support for EV8904DD-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 emphasis on efficiency, integration, and reliability in power management solutions.

The MP8904 product line targets ultra-low-voltage, low-quiescent-current regulation in space- and energy-constrained applications such as wearables, IoT edge nodes, and mobile peripheral power rails.

FAQ

What is the default output voltage set on the EV8904DD-00A board?

The board is factory-configured for 1.8V output using R1 = 26.1kΩ and R2 = 10kΩ, per the formula VOUT = 0.5V × (1 + R1/R2). This setting targets common I/O and memory interface rails in mobile processors and microcontrollers.

Does the EV8904DD-00A require a separate bias supply?

Yes - the MP8904 IC on the board requires a dedicated 2.5V–6.5V VBIAS supply independent of VIN to power its internal reference and control circuitry. This decoupling ensures regulation accuracy remains unaffected by VIN ripple or sag.

Can the output voltage be adjusted, and how?

Yes - VOUT is resistor-programmable via the feedback divider (R1 and R2). Replace R1 and/or R2 to achieve any value from 0.5V to 5V using VOUT = 0.5V × (1 + R1/R2); C3 (1nF) must remain connected to VREF for stability.

What capacitors are used for input and output filtering on this board?

The board uses a 2.2µF X7R ceramic (C1, 1206) at VIN, a 4.7µF X7R ceramic (C2, 1206) at VOUT, and a 1nF X7R ceramic (C3, 0603) at VREF. All are low-ESR types validated for MP8904 stability without additional series resistance.

How is enable functionality implemented on the EV8904DD-00A?

The EN pin accepts standard CMOS logic: drive >1.2V to enable regulation, <0.4V to disable. Internal pull-down ensures safe default-off state. No external pull-up is required, simplifying host processor GPIO interfacing.

Is thermal protection verified on this evaluation board?

Yes - the MP8904 IC includes internal thermal shutdown, and the EV8904DD-00A layout places U1 (QFN-8) over a thermal pad connected to internal copper planes, enabling measurable trip behavior during sustained 500mA operation above ambient limits.