STMicroelectronics STBC02JR

Overview

STBC02JR from STMicroelectronics is a highly integrated Li-Ion linear battery charger IC with embedded 150 mA LDO, two 3 Ω SPDT load switches, smart reset/watchdog generator, and protection circuit module (PCM). It delivers CC/CV charging up to 450 mA, programmable floating voltage up to 4.45 V, and <10 nA battery leakage in shipping mode. It targets space-constrained wearable devices requiring autonomous power path management and low-quiescent operation.

For engineers reviewing the STBC02JR datasheet, STBC02JR pinout, STBC02JR application, or STBC02JR equivalent, this device supports critical design tasks including battery charge termination validation, LDO output stability analysis under dynamic SYS loading, SPDT switch timing coordination via SWIRE, and PCM fault response verification across overcharge/over-discharge/overcurrent conditions.

Technical Context

The STBC02JR implements dual-stage linear charging control: pre-charge (1–450 mA, triggered at VBAT < 3 V) transitions to fast-charge (up to 450 mA) upon reaching 3 V, then switches to constant-voltage regulation with 5% IEND termination. Its power path automatically selects between IN (5 V input) and BAT (battery) for SYS supply based on VIN status and battery voltage thresholds (VUVLO = 3.9 V, VODC = 2.8 V).

Integrated safety logic includes thermal warning (135 °C) and shutdown (155 °C), NTC-based temperature monitoring (0–45 °C window), and hardware-enforced protections: battery overcharge (VOCHG = 4.275 V ±30 mV), over-discharge (VODC = 2.8 V ±50 mV), and discharge overcurrent (IBATOCP = 900 mA). All protections trigger automatic SYS/LDO disable and CHG flag assertion.

Key Specifications

Pinout & Package

STBC02JR is housed in a Flip Chip 30 package (2.25 × 2.59 mm, 0.4 mm pitch), optimized for ultra-thin wearable PCBs with bottom-side soldering and minimal footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-function battery management applications.

Compared with BQ24075RGTR and MAX1555ESA+, STBC02JR uniquely integrates LDO, dual SPDT switches, smart reset, and shipping mode in one Flip Chip 30 package - reducing PCB area by >40% and eliminating 5+ external components required by alternatives.

Availability

STBC02JR is available at Aetrix Electronics and suitable for smart watches, fitness trackers, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed wafer fab allocation.

Supply support for STBC02JR 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 markets.

The STBC02JR belongs to ST's ultra-low-power battery management IC product line, engineered specifically for miniaturized wearable and medical electronics where integration density, battery longevity, and functional safety are non-negotiable.

FAQ

What is the purpose of the BATSNSFV pin?

The BATSNSFV pin enables precise adjustment of the battery floating voltage up to 4.45 V using an external resistor. When connected directly to the battery terminal, it defaults to 4.2 V. This feature supports high-energy-density Li-Poly cells requiring elevated termination voltages while maintaining tight ±30 mV accuracy over temperature and process variation.

How does the STBC02JR handle thermal events during charging?

At 135 °C (TWRN), the STBC02JR halves the programmed fast-charge current and asserts a 16.2 Hz CHG toggle to signal thermal warning. If junction temperature reaches 155 °C (TSD), it shuts down all outputs except CHG and enters thermal shutdown. Recovery requires die cooling below TWRN − 10 °C, after which charging resumes at reduced current.

Can the SPDT load switches operate independently?

Yes - SW1 and SW2 are fully independent. Each has dedicated input (SW1_I/SW2_I) and dual outputs (SW1_OA/SW1_OB and SW2_OA/SW2_OB), controlled by the SWIRE pin. Routing is determined by SWIRE state and LDO voltage level, allowing dynamic reconfiguration of power rails without MCU intervention or additional logic.

What happens to the LDO output during battery over-discharge?

When battery voltage drops below 2.8 V (VODC) and IN is absent, the STBC02JR disables the LDO output and places SYS in high-impedance state. The LDO remains off until either VIN rises above VUVLO (3.9 V) or battery voltage recovers above 3.0 V (VODCR) and WAKE-UP is asserted - preventing brownout operation and protecting downstream circuitry.