Renesas RTKA211835DE0000BU

Overview

RTKA211835DE0000BU from Renesas Electronics is an evaluation board designed to demonstrate and rapidly assess the RAA211835 QFN-packaged asynchronous buck regulator, supporting 4.5V–75V input, delivering 3.3V/3A output with programmable switching frequency for high-voltage industrial power conversion.

For engineers reviewing the RTKA211835DE0000BU datasheet, RTKA211835DE0000BU application, RTKA211835DE0000BU setup, or RTKA211835DE0000BU reference design, this board provides validated layout, measurable efficiency curves, load transient response data, and configurable feedback network for real-world DC/DC validation under wide-input conditions.

Technical Context

The RTKA211835DE0000BU implements the RAA211835 (RAA211835GNP#HA0) in a fixed 3.3V output configuration using 62kΩ/20kΩ resistor divider on FB pin, with integrated 155mΩ high-side MOSFET and external synchronous rectification omitted per asynchronous topology. It operates across full 4.5V–75V VIN range without derating.

Board-level features include EN-controlled startup/shutdown sequencing, PG signal monitoring at J1, BST capacitor support for gate drive, and provisioned test points (TP1–TP13) for SW node, VOUT, FB, and phase current sensing-enabling direct oscilloscope measurement of switching waveforms and regulation stability.

Key Specifications

Availability

RTKA211835DE0000BU is available at Aetrix Electronics and suitable for industrial motor drives, railway control systems, and telecom power supplies requiring stable component supply, rapid prototyping validation, and production-ready reference design fidelity.

Supply support for RTKA211835DE0000BU 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

Renesas Electronics Corporation is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog power devices, and embedded solutions for automotive, industrial, and infrastructure markets.

The RTKA211835DE0000BU belongs to Renesas' high-voltage DC/DC evaluation platform family, engineered to accelerate adoption of their RAA21xxx series regulators in harsh-environment applications demanding wide-input operation and robust thermal performance.

FAQ

What is the primary function of the RTKA211835DE0000BU evaluation board?

The RTKA211835DE0000BU evaluation board is a fully assembled, tested hardware platform that demonstrates the operational behavior of the RAA211835 asynchronous buck regulator. It enables engineers to validate input voltage range, output regulation accuracy, efficiency, transient response, and protection features-including overcurrent and EN-controlled startup-without designing a custom PCB. The RTKA211835DE0000BU includes all necessary passives, test points, and jumpers for immediate bench testing.

Can the output voltage of the RTKA211835DE0000BU be adjusted, and how?

Yes, the RTKA211835DE0000BU output voltage is adjustable via the FB resistor divider network (R9 and R10). By default, R9 = 62kΩ and R10 = 20kΩ set VOUT to 3.3V per the RAA211835's internal 0.8V reference. To change output voltage, replace R9 using Equation 1 from the manual: VOUT = 0.8V × (1 + R9/R10). The RTKA211835DE0000BU schematic reserves space for alternate values and supports rework of these 0603 resistors.

Does the RTKA211835DE0000BU support programmable switching frequency, and how is it configured?

Yes, the RTKA211835DE0000BU supports programmable switching frequency through the FS pin of the RAA211835 IC. The board routes FS to test point TP6, allowing connection to an external resistor or voltage source per the RAA211835 datasheet. Frequency ranges from ~100kHz to 2.2MHz depending on FS bias; the default configuration on RTKA211835DE0000BU uses no external pull-up/down, resulting in nominal ~600kHz operation as shown in Figures 12–14.

What protection features can be evaluated using the RTKA211835DE0000BU?

The RTKA211835DE0000BU enables direct observation of overcurrent protection (Figure 17), EN-controlled soft-start/shutdown (Figures 14 & 16), and load regulation stability (Figure 11). The PG (Power Good) signal is accessible at J1 and TP13, confirming proper regulation before system enablement. Thermal shutdown is observable via reduced output under sustained 3A load at high ambient, consistent with RAA211835's internal thermal foldback behavior.

Is the RTKA211835DE0000BU compatible with other RAA211835 package variants?

No-the RTKA211835DE0000BU is specifically designed for the RAA211835GNP (16-pin QFN) variant, as confirmed by U1's manufacturer part number in the BOM and mechanical layout matching QFN-16 dimensions. It is not compatible with SOIC or other footprint variants of the RAA211835 family. Layout, thermal pad connections, and pinout alignment are optimized exclusively for the GNP package used on the RTKA211835DE0000BU.