Monolithic Power Systems Inc. EV3217DJ-00A

Overview

EV3217DJ-00A from Monolithic Power Systems is an evaluation board for a 670 kHz, 70 V voltage doubler circuit based on the MP3217 current-mode boost converter IC in TSOT23-6 package. It delivers up to 1 mA output current from a 3.3 V input, integrates cycle-by-cycle over-current protection, UVLO, thermal shutdown, and over-voltage shutdown, and targets APD bias generation in portable optical sensing systems.

For engineers reviewing the EV3217DJ-00A datasheet, EV3217DJ-00A pinout (of underlying MP3217), EV3217DJ-00A application in high-voltage bias generation, or EV3217DJ-00A equivalent evaluation platforms, this board provides validated layout, BOM, and quick-start configuration guidance for rapid prototyping of compact 70 V DC-DC doubling stages.

Technical Context

The EV3217DJ-00A implements a two-stage charge-pump voltage doubler using the MP3217 boost controller, D1–D3 diodes, C1–C4 capacitors, and L1 inductor. It operates at fixed 670 kHz switching frequency with internal 0.6 Ω MOSFET, enabling small external passive components - including 47 µH D63LCB inductor and 1 µF/100 V ceramic output capacitor (C4).

Output voltage is set via resistor divider R1/R2 (249 kΩ / 4.53 kΩ) to 70 V (V_FB = 1.24 V), and supports external adjustment via ADJ pin. The board also allows reconfiguration to standard boost mode (up to 36 V) by opening D2/D3/C2 and shorting R6.

Key Specifications

Availability

EV3217DJ-00A is available at Aetrix Electronics and suitable for APD bias generation, portable medical sensors, and digital still camera flash charging requiring stable component supply, repeatable test conditions, and fast-turn evaluation of high-voltage DC-DC doubling topologies.

Supply support for EV3217DJ-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, LED drivers, and motor control solutions.

The MP3217 product line targets ultra-compact, low-power boost converters for battery-operated devices requiring high-voltage bias rails - optimized for minimal footprint, robust protection, and ease of evaluation.

FAQ

What is the default output voltage and how is it set?

The EV3217DJ-00A is configured for 70 V output in voltage-doubler mode. This is achieved using R1 = 249 kΩ and R2 = 4.53 kΩ, referencing the MP3217's 1.24 V feedback threshold. The formula V_OUT = V_FB × (1 + R1/R2) yields 70.0 V, verified per the Quick Start Guide and schematic.

Can the board operate in standard boost mode instead of voltage doubler mode?

Yes. By opening diodes D2 and D3, capacitor C2, and shorting resistor R6, the board reconfigures as a standard boost converter. Output voltage then scales up to 36 V using the same R1/R2 divider, per the Quick Start Guide instructions and schematic revision notes.

Which components define the 670 kHz switching frequency?

The 670 kHz switching frequency is fixed internally by the MP3217 IC and does not depend on external timing components. No resistor or capacitor sets this frequency - it is a factory-trimmed characteristic of the MP3217 die, confirmed in the Electrical Specification section and General Description.

What protection features are implemented on this evaluation board?

The board inherits all MP3217 protections: under-voltage lockout (UVLO), cycle-by-cycle over-current protection, over-voltage shutdown, and thermal overload protection. These are active at IC level; no additional discrete protection circuitry is added on the EV3217DJ-00A PCB.

Is the ADJ pin functional on this board, and how is it used?

Yes. Pin 5 (ADJ) accepts an external adjustable voltage to dynamically scale output voltage. The Quick Start Guide provides the full formula: V_ADJ = V_FB + (R3/R1)·(V_OUT − V_FB) − (R3/R2)·V_FB, where R3 is left unpopulated (NC) by default but reserved for user modification.

What is the recommended input power source and connection method?

A stable 3.3 V DC source capable of ≥50 mA is recommended. Connect positive to VIN test point (or U1 pin 1), negative to GND test point (or U1 pin 3). Enable the MP3217 by ensuring V_EN > 2 V (U1 pin 6); disable by shorting EN to GND. Power must be applied only after connections are secured.