Diodes Incorporated AP61203Z6-EVM

Overview

AP61203Z6-EVM from Diodes Incorporated is an evaluation board for the AP61203 1A synchronous buck converter, supporting 2.3V–5.5V input and programmable 0.6V–3.6V output. It features a SOT563-packaged IC with 2.2MHz switching frequency, 0.6V ±2% reference, 14µA quiescent current in PFM mode, and integrated power-good indicator for point-of-load DC-DC conversion in space-constrained consumer and embedded systems.

For engineers reviewing the AP61203Z6-EVM datasheet, AP61203Z6-EVM pinout, AP61203Z6-EVM application, or AP61203Z6-EVM equivalent, key selection considerations include its pre-configured 1.8V output, test-point access to VIN/VOUT/SW/EN/PG, support for 2A load testing, and compatibility with standard 0805 passives and Würth 74438357010 inductor - all validated per Diodes' Rev 1 June 2023 documentation.

Technical Context

The AP61203Z6-EVM implements constant-on-time (COT) control architecture to deliver fast transient response and low output voltage ripple without external compensation. Its layout provides direct access to critical nodes - including SW, EN, and PG - enabling real-time oscilloscope monitoring of switching behavior and enable sequencing.

Designed around the AP61203 IC, the board integrates discrete 10µF X5R ceramic input/output capacitors (Taiyo Yuden EMK212ABJ106KD-T), a 1.0µH shielded inductor (Würth 74438357010), and precision 1% resistor divider (R1=200kΩ, R2=100kΩ) to set VOUT=1.8V, meeting ±1% accuracy under 2A load per test procedure.

Key Specifications

Availability

AP61203Z6-EVM is available at Aetrix Electronics and suitable for FPGA core supplies, network camera power rails, wireless router SoC regulation, and white goods microcontroller domains requiring stable component supply, rapid prototyping validation, and production-ready reference design fidelity.

Supply support for AP61203Z6-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 high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP61203 product line delivers compact, low-quiescent-current buck converters targeting space- and power-sensitive point-of-load applications in portable and always-on electronics.

FAQ

What input voltage range is supported on the AP61203Z6-EVM?

The AP61203Z6-EVM accepts 2.3V to 5.5V DC input, verified per Diodes' Rev 1 documentation. It operates stably at 5V (standard USB/SMPS rail) and down to 2.3V (single-cell LiFePO₄ or deeply discharged Li-ion), with UVLO activation below 2.1V and OVP protection up to +7.0V for 400ms transients.

How is output voltage set and verified on this evaluation board?

VOUT is fixed at 1.8V using R1=200kΩ and R2=100kΩ (1% tolerance), yielding 0.6V × (1 + 200k/100k) = 1.8V. Verification requires measuring between VOUT and GND with a multimeter; Diodes specifies ±1% accuracy under 2A load, confirmed by oscilloscope ripple analysis per Figures 7–8 in the June 2023 datasheet.

Can the AP61203Z6-EVM be used to evaluate different output voltages?

Yes - the board supports reconfiguration by replacing R1 and R2 with values from Diodes' Table 1 (e.g., 200kΩ/63.2kΩ for 2.5V). The feedback node (FB) is accessible via test point, and no PCB modification is required; only resistor changes are needed to achieve any output from 0.6V to 3.6V within the IC's specification.

Does the board include thermal management provisions for 2A operation?

Yes - the AP61203Z6-EVM uses the AP61203 in SOT563 with internal thermal shutdown (TJ = +125°C) and exposes the IC's thermal pad to the bottom-layer copper pour. Layout follows Diodes' recommended thermal relief pattern, and efficiency curves (Figure 6) confirm stable operation at 2A across ambient temperatures from –40°C to +85°C.