STMicroelectronics STEVAL-ISB035V1

Overview

STEVAL-ISB035V1 from STMicroelectronics is an evaluation board for the STBC03 single-cell Li-Ion/Li-Po battery power management IC, integrating a linear CC-CV charger (1–650 mA fast/pre-charge), 4.45 V adjustable floating voltage, integrated 3 Ω SPDT load switches, and always-ON LDO regulator. It supports USB-powered charging, battery backup operation, and shipping/shutdown modes with <100 nA quiescent current.

For engineers reviewing the STEVAL-ISB035V1 datasheet, STEVAL-ISB035V1 pinout, STEVAL-ISB035V1 application, or STEVAL-ISB035V1 equivalent, this board enables rapid validation of STBC03-based portable power architectures including wearable health monitors, Bluetooth trackers, and low-power IoT sensors requiring integrated charge control, battery protection, and dual-load switching.

Technical Context

The STEVAL-ISB035V1 implements the full functional interface of the STBC03 IC, exposing all digital control inputs (EN, SHIP, MODE), analog programming pins (ISET1/ISET2, VFLOAT), and power terminals (VIN, BAT, VOUT, SWx). It operates across input supply ranges from 4.25 V to 5.5 V and supports battery voltages up to 4.45 V with overcharge/over-discharge and overcurrent protections active by default.

Board-level features include micro-AB USB connector for input power, test points for all critical nodes, header connectors for STBC03 signal access, and discrete jumpers to configure pre-charge/fast-charge current and floating voltage via external resistors - directly mirroring production-level STBC03 design practices.

Key Specifications

Availability

STEVAL-ISB035V1 is available at Aetrix Electronics and suitable for wearable medical devices, asset tracking tags, and smart sensor nodes requiring stable component supply, rapid prototyping of battery-backed power systems, and validation of STBC03 integration in space-constrained designs.

Supply support for STEVAL-ISB035V1 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, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and MEMS sensors for industrial, automotive, and consumer applications.

The STEVAL-ISB035V1 belongs to ST's STBC evaluation board family, developed specifically to accelerate design-in of its battery charge and system power management ICs in ultra-low-power portable electronics.

FAQ

What power sources can be used to operate the STEVAL-ISB035V1?

The board accepts power via its micro-AB USB connector (4.25–5.5 V), which simultaneously charges the connected Li-Ion/Li-Po battery and powers the onboard LDO. When no valid input is present and the battery voltage exceeds 2.5 V, the board automatically switches to battery power - enabling uninterrupted operation during USB disconnection or field deployment.

How are the STBC03 load switches controlled on this board?

The two integrated 3 Ω SPDT load switches are controlled by dedicated digital inputs (SW1_CTRL and SW2_CTRL) accessible via header pins J3 and J4. Each switch supports independent ON/OFF control and connects either VOUT or BAT to the output rail, allowing dynamic power routing for subsystems like radios, sensors, or displays without external MOSFETs or logic.

Does the STEVAL-ISB035V1 support battery protection functions out-of-the-box?

Yes - battery overcharge (up to 4.45 V), over-discharge (2.5 V threshold), and overcurrent protection are implemented in hardware by the STBC03 IC and active by default. No configuration or firmware is required; protection triggers automatically during charging, discharging, or fault conditions, safeguarding both battery and downstream circuitry.

Can the STEVAL-ISB035V1 be used without connecting a host microcontroller?

Yes - the board operates in standalone mode using onboard pull-up/pull-down resistors to set default behavior (e.g., EN = high, SHIP = low). All digital control inputs are exposed via headers, enabling manual jumper configuration or connection to external logic. Full functionality - including charge enable, shipping mode entry, and load switch control - remains accessible without MCU intervention.