STMicroelectronics STEVAL-ISA077V1

Overview

STEVAL-ISA077V1 from STMicroelectronics is a demonstration board built around the L6920DB synchronous step-up DC-DC converter IC, designed for battery-powered systems requiring high-efficiency voltage boosting from low-input sources. It supports input voltages as low as 0.6 V, delivers adjustable output from 1.8 V or fixed 3.3 V/5 V, integrates internal synchronous rectification, and features reverse battery protection and 750 mA input current limiting.

For engineers reviewing the STEVAL-ISA077V1 datasheet, STEVAL-ISA077V1 pinout, STEVAL-ISA077V1 application, or STEVAL-ISA077V1 equivalent, key selection considerations include its use of the L6920DB controller, support for ultra-low startup voltage (0.8 V), integrated supervisory functions (low-battery detection, shutdown), and suitability for space-constrained portable designs requiring minimal external components.

Technical Context

The board implements a fixed-frequency, current-mode synchronous boost topology using the L6920DB IC, which integrates both power switches and control logic in a single monolithic device. Its 1 MHz switching frequency enables compact passive component selection, while the 0.6 V minimum operating voltage and 0.8 V startup threshold target single-cell alkaline, NiMH, or LiFePO₄ battery inputs.

Supervisory circuitry includes an internal reference voltage, programmable low-battery detection with hysteresis, and overcurrent protection triggered by input current sensing. The board requires only three external components - inductor, output capacitor, and feedback resistor network - to configure output voltage and enable operation.

Key Specifications

Availability

STEVAL-ISA077V1 is available at Aetrix Electronics and suitable for portable medical monitors, handheld industrial scanners, and low-power IoT sensor nodes requiring stable component supply and rapid evaluation of ultra-low-voltage boost conversion.

Supply support for STEVAL-ISA077V1 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

The STEVAL-ISA077V1 belongs to ST's STEVAL evaluation board family, developed specifically to accelerate prototyping and validation of their ultra-low-voltage DC-DC converters in battery-operated edge devices.

FAQ

What input battery chemistries are supported by the STEVAL-ISA077V1?

The board supports single-cell alkaline, NiMH, and LiFePO₄ batteries due to its 0.6 V minimum operating voltage and 0.8 V startup capability. It is not rated for Li-ion cells without external undervoltage cutoff, as their discharge curve falls below 2.5 V before full depletion.

Can the output voltage be set to values other than 1.8 V, 3.3 V, or 5 V?

Yes - the L6920DB IC on this board supports adjustable output via external feedback resistors. The default configuration offers 1.8 V (adjustable mode), 3.3 V, or 5 V; users can reconfigure R1/R2 to achieve any stable output between 1.8 V and 5.5 V within the IC's specification limits.

Does the STEVAL-ISA077V1 include ESD protection on its input/output terminals?

No - the board does not integrate dedicated ESD protection diodes on its input or output pads. System-level ESD robustness must be implemented externally per IEC 61000-4-2 Level 2 or higher requirements, especially when interfacing with user-accessible connectors.

Is the L6920DB IC on this board RoHS compliant and halogen-free?

Yes - the L6920DB used on STEVAL-ISA077V1 is RoHS compliant and halogen-free, as confirmed in ST's official product brief (Doc ID 18237 Rev 1) and the device's packaging marking. Full compliance documentation is available upon request from STMicroelectronics.