STMicroelectronics STEVAL-ISA049V1

Overview

STEVAL-ISA049V1 from STMicroelectronics is a synchronous dual buck converter demonstration board based on the ST2S06A IC, designed to power low-voltage digital cores in optical disc drive (ODD) applications. It delivers up to 0.5 A per channel across 2.5 V–5.5 V input, features 1.5 MHz fixed-frequency current-mode PWM control, 2% DC output voltage tolerance, and integrated reset functionality.

For engineers reviewing the STEVAL-ISA049V1 datasheet, STEVAL-ISA049V1 pinout, STEVAL-ISA049V1 application, or STEVAL-ISA049V1 equivalent, this board enables rapid evaluation of dual-output, high-efficiency DC-DC conversion with thermal protection, soft-start timing (50–100 µs), and low-noise synchronous rectification for space-constrained embedded power designs.

Technical Context

The board implements two independent synchronous buck regulators using the ST2S06A's integrated high-side and low-side MOSFETs (R_DS(on) = 150 mΩ typ.), operating in current-mode PWM at 1.5 MHz to minimize external passive size. Each channel supports fixed or resistor-adjustable output down to 0.8 V with ±2% DC accuracy over temperature and load.

It incorporates internal soft-start (50–100 µs power-on delay), non-switching quiescent current ≤1 mA over temperature, and built-in overcurrent and thermal shutdown protection-enabling robust evaluation of low-power digital core supply architectures without external supervision circuitry.

Key Specifications

Availability

STEVAL-ISA049V1 is available at Aetrix Electronics and suitable for optical disc drive (ODD) power management, low-voltage digital core evaluation, and dual-rail embedded processor supply validation requiring stable component supply and documented reference design traceability.

Supply support for STEVAL-ISA049V1 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STEVAL-ISA049V1 belongs to ST's ST2S06A-based evaluation platform family, developed specifically to accelerate adoption of compact, high-efficiency synchronous buck converters for low-power digital core supplies in optical storage and portable embedded systems.

FAQ

What input voltage range does the STEVAL-ISA049V1 support?

The board operates from 2.5 V to 5.5 V DC input, matching the ST2S06A's specified range. This allows direct compatibility with single-cell Li-ion, USB-powered, or regulated 3.3 V/5 V system rails-no external pre-regulation required for typical ODD or portable digital core applications.

Does the board provide independent output voltage adjustment for each channel?

Yes-each buck channel uses its own external resistor divider to set output voltage independently, supporting asymmetric rail configurations (e.g., 1.2 V for CPU core and 1.8 V for I/O). The ST2S06A's dual feedback inputs enable simultaneous regulation without cross-coupling.

Is the reset signal synchronized to power-up sequencing?

Yes-the board outputs an active-low reset signal with a programmable 50–100 µs delay after input stabilization, aligned to the ST2S06A's internal soft-start timer. This ensures deterministic release of downstream logic after both outputs reach regulation.

Can the STEVAL-ISA049V1 be used without soldering modifications?

Yes-it is a fully assembled, tested demonstration board with all critical components populated, including dual inductors, input/output capacitors, feedback resistors, and reset pull-up. No soldering is needed to evaluate basic operation, though resistor changes are supported for custom output voltages.