STMicroelectronics STNS01PUR

Overview

STNS01PUR from STMicroelectronics is a single-cell Li-Ion linear battery charger with integrated 3.1 V LDO regulator, CC/CV charging algorithm, 4.2 V floating voltage (±1%), 200 mA programmable charge current, and comprehensive battery protection including overcharge, over-discharge, and overcurrent detection. It serves as power management IC in portable fitness trackers.

For engineers reviewing the STNS01PUR datasheet, STNS01PUR pinout, STNS01PUR application, or STNS01PUR equivalent, key selection criteria include LDO output stability under load, shutdown leakage (<500 nA), ISET resistor programming range (1–13 kΩ), and dual-path power management between IN and BAT.

Technical Context

The STNS01PUR implements a two-stage CC/CV charge algorithm with pre-charge (20% of fast-charge current) and termination (10% of fast-charge current), all scaled via external ISET resistor. Battery voltage sensing uses dedicated BATSNS and BATMS pins for accurate monitoring independent of PCB trace resistance.

Power path management automatically selects between IN and BAT to supply SYS and LDO outputs, with internal MOSFETs exhibiting RON-BS = 0.38–0.55 Ω and RON-IB = 1–1.5 Ω. Fault handling includes 1 Hz CHG pin blinking during overtemperature, overvoltage, or overcurrent events, with deglitch timers ranging from 10 ms (fast-charge fault) to 1.2 s (overcharge detection).

Key Specifications

Pinout & Package

STNS01PUR is housed in a DFN12L package (3 mm × 3 mm × 0.75 mm height) with exposed thermal pad connected to GND for enhanced thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-Ion linear charger with integrated LDO applications.

Compared with TPS65023BRSBT and BQ24075RGTR, STNS01PUR uniquely combines 200 mA programmable charging, integrated 3.1 V LDO, and direct NTC interface in a 3×3 mm DFN - making it optimal for space-limited, low-power wearables where system integration and ultra-low shutdown leakage are prioritized over raw charge current or multi-rail flexibility.

Availability

STNS01PUR is available at Aetrix Electronics and suitable for portable fitness devices, USB-powered audio players, smart pens, and wireless sensor nodes requiring stable component supply, long shelf-life support, and compact power management integration.

Supply support for STNS01PUR 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 STNS01 product line targets ultra-compact, low-power portable electronics requiring integrated battery charging, regulated system power, and robust battery protection in minimal footprint - emphasizing reliability, low quiescent current, and ease of layout with dedicated sense pins.

FAQ

What is the recommended ISET resistor value for 150 mA fast-charge current?

The STNS01PUR datasheet specifies that fast-charge current scales inversely with ISET resistance: 200 mA at 1 kΩ, 15 mA at 13 kΩ. For 150 mA, interpolation yields ~1.33 kΩ. Use a 1.3 kΩ ±1% resistor; verify actual current with load and battery voltage per Table 6 test conditions.

How does the STNS01PUR handle battery voltage sensing accuracy?

It employs two dedicated pins: BATSNS connects directly to the battery anode to minimize PCB trace resistance error, while BATMS provides high-impedance voltage measurement for floating voltage regulation. This dual-sense architecture achieves ±1% floating voltage accuracy (4.2 V) independent of current path losses.

Can the LDO output power external circuitry during battery-only operation?

Yes. When VIN is invalid (below UVLO), the STNS01PUR automatically routes battery power to both SYS and LDO outputs. The LDO delivers up to 100 mA at 3.1 V with ±3% accuracy and <0.002%/mA load regulation, supporting MCUs, sensors, or RF transceivers directly from the battery.

What happens to the CHG pin during overtemperature fault?

When overtemperature is detected via the NTC pin (e.g., VHOT exceeded), the CEN pin is disabled by external circuitry, halting charging. The CHG pin then toggles low/high at 1 Hz - a visible, firmware-readable fault indication that persists until temperature returns to safe range and CEN is re-enabled.