Renesas RTKA211651DE0000BU

Overview

RTKA211651DE0000BU from Renesas Electronics is an evaluation board designed to characterize and prototype with the RAA211651 60V, 5A synchronous buck regulator. It supports 4.5V–60V input, delivers regulated 3.3V/5A output, and features configurable soft-start (2ms), start-up delay (2ms), internal compensation, and EBIAS tied to VOUT for bias efficiency.

For engineers reviewing the RTKA211651DE0000BU datasheet, RTKA211651DE0000BU pinout, RTKA211651DE0000BU application, or RTKA211651DE0000BU equivalent, this board enables rapid validation of constant-on-time buck regulation, Diode Emulation Mode (DEM) operation, and layout-sensitive high-current power stage design under real thermal and transient conditions.

Technical Context

The RTKA211651DE0000BU implements the RAA211651 IC in a fixed 3.3V configuration using internal feedback resistors and R8 = 82.5kΩ to set switching frequency near 500kHz at full load. It operates in Diode Emulation Mode (DEM) with internal compensation and includes test points for PHASE, BOOT, EN, PG, and VOUT to capture gate drive dynamics and regulation behavior.

This board integrates a 3.3µH shielded inductor (Wurth 744325330), 68µF bulk input capacitor, twelve 10µF X7S output capacitors, and dedicated ceramic decoupling on AVCC and PVCC. Layout follows Renesas' four-layer PCB guidelines with thermal vias under the QFN exposed pad and strict routing separation between high-dv/dt PHASE node and analog FB/SS paths.

Key Specifications

Availability

RTKA211651DE0000BU is available at Aetrix Electronics and suitable for power supply validation, automotive body electronics prototyping, industrial 24V/48V DC-DC development, and high-reliability embedded system qualification requiring stable component supply and traceable evaluation hardware.

Supply support for RTKA211651DE0000BU 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 and power management ICs, and SoC solutions for automotive, industrial, and IoT applications.

The RTKA211651DE0000BU belongs to Renesas' high-voltage buck regulator evaluation platform family, engineered to accelerate design-in of the RAA211651 for rugged 4.5V–60V input systems demanding compact, efficient, and thermally robust 5A power stages.

FAQ

What is the primary function of the RTKA211651DE0000BU evaluation board?

The RTKA211651DE0000BU evaluation board is a fully assembled, tested platform for evaluating the RAA211651 60V, 5A synchronous buck regulator. It enables engineers to validate regulation accuracy, transient response, efficiency, thermal performance, and feature configurability-including soft-start, delay, compensation mode, and EBIAS sourcing-without designing a custom PCB. The board ships pre-configured for 3.3V/5A operation at ≈500kHz.

Can the RTKA211651DE0000BU be used to evaluate output voltages other than 3.3V?

Yes, the RTKA211651DE0000BU supports other output voltages by modifying the external feedback resistors R21 and R23. The board is shipped with R21 = 20kΩ and R23 = 62kΩ for 3.3V, but Equation 12 in the manual allows calculation of R23 for alternate VOUT values. When changing VOUT, Renesas requires updating the output inductor, output capacitors, and R9 using the official RAA211651 design spreadsheet to maintain stability and performance.

How is the switching frequency set on the RTKA211651DE0000BU, and can it be adjusted?

The RTKA211651DE0000BU uses R8 = 82.5kΩ to set the switching frequency close to 500kHz for 3.3V output at full 5A load. Frequency adjustment is supported via Equation 11: R8 (kΩ) = 12.5×10⁶ / (VOUT × fSW). To change fSW, replace R8 with a new value calculated for the desired frequency and output voltage, then verify loop stability using the RAA211651 design spreadsheet and compensation guidelines.

Does the RTKA211651DE0000BU support both Diode Emulation Mode (DEM) and Continuous Conduction Mode (CCM)?

Yes, the RTKA211651DE0000BU ships configured for Diode Emulation Mode (DEM) with internal compensation. To switch to Continuous Conduction Mode (CCM), remove jumper R12 and populate external compensation components R15, C9, and C7 as specified in Section 1.4.5. This reconfiguration changes the control loop behavior and requires verification using the RAA211651 design spreadsheet to ensure phase margin and transient response meet target requirements.

What are the key layout and thermal design features implemented on the RTKA211651DE0000BU board?

The RTKA211651DE0000BU implements Renesas' recommended four-layer PCB stackup with 2oz outer copper and 1oz inner layers. It includes thermal vias under the RAA211651's exposed pad connected to internal GND planes, tight placement of AVCC/PVCC decoupling capacitors adjacent to their respective pins, minimized PHASE node copper area, and strict separation of FB traces from noisy BOOST/PHASE nodes. These features collectively enable reliable 5A operation at 60V input while maintaining thermal rise within specification limits.