STMicroelectronics STEVAL-ISB032V1

Overview

STEVAL-ISB032V1 from STMicroelectronics is an evaluation board for the STNS01 linear Li-Ion battery charger IC, designed for single-cell 4.2 V battery charging with CC/CV algorithm, integrated 3.1 V LDO regulator, and full battery protection (over-charge, over-discharge, overcurrent), targeting portable medical devices, wearables, and IoT sensors.

For engineers reviewing the STEVAL-ISB032V1 datasheet, STEVAL-ISB032V1 pinout, STEVAL-ISB032V1 application, or STEVAL-ISB032V1 equivalent, key selection considerations include programmable 400 mA charge current, 1% floating voltage accuracy, automatic power path management, low 500 nA shutdown leakage, and dedicated CHG/FAULT status signaling.

Technical Context

The board implements the STNS01 IC in a complete reference design with USB Micro-B input (VIN), system power rail (SYS), battery interface (BAT), and LDO output (LDO). It supports pre-charge, constant-current, and constant-voltage charging phases with termination based on current threshold scaling.

Power path management enables seamless transition between input supply and battery power; integrated protection circuitry monitors battery voltage, current, and temperature via external NTC (JP7) and BATMS sense points, while CE input allows external thermal shutdown control.

Key Specifications

Availability

STEVAL-ISB032V1 is available at Aetrix Electronics and suitable for portable medical monitors, wearable health trackers, smart sensor nodes, and battery-backed industrial controllers requiring stable component supply and rapid prototyping capability.

Supply support for STEVAL-ISB032V1 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, specializing in microcontrollers, power management, analog, MEMS, and automotive ICs.

The STEVAL-ISB032V1 belongs to ST's STNS01-based evaluation platform family, engineered to accelerate development of compact, single-cell Li-Ion charging solutions for space-constrained, low-power portable electronics.

FAQ

What input voltage range does the STEVAL-ISB032V1 support?

The board accepts 4.5 V to 5.5 V via USB Micro-B connector (JP1), matching the STNS01's recommended VIN range. Operation below 4.5 V may disable charging or cause unstable LDO regulation; input must exceed battery voltage by ≥200 mV for proper power path switching.

How is charge current programmed on this evaluation board?

Charge current is set by resistor R1 (600 Ω) connected to ISET pin (U1 pin 9); default value yields ~400 mA. Scaling follows I_CHG = 1000 V / R_ISET, with pre-charge and termination currents automatically scaled at 10% and 15% of fast-charge value respectively.

Does the board provide battery temperature monitoring?

Yes - JP7 (BATMS) provides access to the STNS01's battery monitor sense input, and JP8 connects to NTC1 (10 kΩ thermistor) via dedicated NTC pin (U1 pin 11), enabling external thermal foldback or shutdown when paired with appropriate conditioning circuitry.

Can the STEVAL-ISB032V1 operate without a battery connected?

No - the STNS01 requires a valid battery connection for internal biasing and safety logic. With no battery, SYS rail remains unpowered even with VIN applied; the board will not deliver LDO output or assert CHG status, and may enter fault mode per datasheet behavior.