Diodes Incorporated AP3015K-EVM

Overview

AP3015K-EVM from Diodes Incorporated is an evaluation board for the AP3015KTR step-up DC/DC converter IC, supporting 1.2V–12V input and delivering up to 34V output at 350mA switching current limit. It implements fixed off-time PFM control with 17µA quiescent current in active mode and features test points for VIN, VOUT, SHDN, and SW signals on a compact SOT-23-5-based layout.

For engineers reviewing the AP3015K-EVM datasheet, AP3015K-EVM pinout, AP3015K-EVM application, or AP3015K-EVM equivalent, this board enables rapid validation of efficiency, output ripple, switching frequency (1.5MHz), enable/disable sequencing, and load transient response under real-world conditions including 30mA–300mA output loads and -40°C to +85°C operation.

Technical Context

The AP3015K-EVM is designed exclusively to evaluate the AP3015KTR synchronous boost converter, which uses pulse frequency modulation with fixed off-time control to maintain high efficiency across light-to-moderate loads. Its circuit includes a 10µH power inductor (Wurth 74438336100), Schottky flyback diode (B140B-13-F), and three ceramic capacitors (4.7µF, 1µF, 0.1µF) optimized for stability and low ESR.

Board-level functionality centers on accessible signal routing: EN is pulled high via 100kΩ (R4) for default operation, SHDN is brought out to JH6 for manual enable/disable control, and VOUT_S/GND test points allow direct oscilloscope measurement without probe ground loop interference - critical for accurate 20V output ripple assessment.

Key Specifications

Availability

AP3015K-EVM is available at Aetrix Electronics and suitable for MP3/MP4 players, handheld medical monitors, portable LCD/OLED bias supplies, and battery-powered communication devices requiring stable component supply and fast prototyping turnaround.

Supply support for AP3015K-EVM 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP3015K-EVM belongs to Diodes' evaluation platform series for DC/DC converters, developed to accelerate design-in of high-efficiency, low-quiescent-current boost regulators in space-constrained portable applications.

FAQ

What input voltage range is supported during evaluation?

The AP3015K-EVM is validated for 1.2V to 12V input operation, with recommended startup at 4.2V (single Li-ion). Absolute maximum input is 15V per AP3015KTR specifications. Input must be current-limited to avoid damage to the 100kΩ EN pull-up resistor and U1's internal circuitry during overvoltage events.

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

Output voltage is set by the R1/R2 feedback divider (2MΩ/130kΩ), yielding ~20V. It can be adjusted by replacing R1 or R2 with values satisfying VOUT = 0.6V × (1 + R1/R2); the FB pin reference is 0.6V per datasheet. Layout allows resistor replacement without redesign, preserving test point access to FB node.

Does the board support efficiency measurement, and how?

Yes: input current is measured by inserting an ammeter in series with VIN, while output current is sourced by an electronic load connected to VOUT/GND. The board's low-inductance layout and dedicated VOUT_S/GND test points minimize measurement error, enabling accurate efficiency calculation across 1mA–300mA load range per Figure 3 in the user guide.

Is thermal performance characterized on this board?

Thermal data is not provided for the AP3015K-EVM itself, but the AP3015KTR IC has θJA = 265°C/W and operates up to +85°C ambient. On this board, the SOT-23-5 U1 has no copper pour or thermal vias; sustained 300mA loads require airflow or intermittent duty to avoid junction temperatures exceeding 150°C.