Overview
The STNS01PUR, produced by STMicroelectronics, is a linear charger designed for single-cell Li-Ion batteries. It integrates an LDO regulator and several battery protection functions. The device uses a CC/CV (Constant Current/Constant Voltage) algorithm for charging, with the fast-charge current programmable up to 200 mA using an external resistor. The STNS01PUR also features automatic power path management, switching to battery power when the input voltage is not valid and the battery is not empty. It includes overcharge, over-discharge, and overcurrent protection to prevent battery damage under fault conditions. The device is available in a DFN12L (3x3x0.75 mm) package and is suitable for various portable and low-power applications.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Input Supply Voltage (VIN) | 4.55 | 5.4 | - | V |
| Floating Voltage (VCHG) | 4.245 | 4.275 | 4.305 | V |
| Fast-Charge Current (IFAST) | - | - | 200 | mA |
| LDO Output Voltage (VLDO) | - | 3.1 | - | V |
| Operating Ambient Temperature (TAMB) | -40 | - | 85 | °C |
| Maximum Junction Temperature (TJ) | - | - | 125 | °C |
| Package Type | - | - | DFN12L (3x3x0.75 mm) | - |
Key Features
- Charges single-cell Li-Ion batteries with CC/CV algorithm and charge termination
- Charge current programmable up to 200 mA
- 1% accuracy on floating voltage (4.2 V)
- Integrated 3.1 V LDO regulator
- Automatic power path management
- Battery overcharge, over-discharge, and overcurrent protection
- Charging timeout and low quiescent current
- Charge/fault status output and charger enable input
- Very low battery leakage in over-discharge/shutdown mode
- Battery temperature monitoring and thermal protection
Applications
- Portable MP3 players
- Portable low-power devices
- Fitness portable devices
- Other battery-powered consumer electronics requiring efficient and protected battery charging
Q & A
- What is the primary function of the STNS01PUR?
The STNS01PUR is a linear charger for single-cell Li-Ion batteries, integrating an LDO regulator and several battery protection functions.
- How is the fast-charge current programmed in the STNS01PUR?
The fast-charge current can be programmed up to 200 mA using an external resistor connected to the ISET pin.
- What is the floating voltage accuracy of the STNS01PUR?
The floating voltage accuracy is 1% at 4.2 V.
- What type of protection does the STNS01PUR offer for the battery?
The STNS01PUR offers overcharge, over-discharge, and overcurrent protection to prevent battery damage under fault conditions.
- How does the STNS01PUR manage power when the input voltage is not valid?
The device automatically switches to battery power when the input voltage is not valid and the battery is not empty.
- What is the maximum operating ambient temperature for the STNS01PUR?
The maximum operating ambient temperature is 85°C.
- What is the package type of the STNS01PUR?
The device is available in a DFN12L (3x3x0.75 mm) package.
- How does the charger enable input (CEN) function in the STNS01PUR?
A logic low level on the CEN pin disables the battery charger, and a transition from high to low and then back to high restarts the charger under certain conditions.
- What is the purpose of the CHG pin in the STNS01PUR?
The CHG pin is an active-low open-drain charging/fault flag that indicates the charging status and any fault conditions.
- How does the STNS01PUR handle battery temperature monitoring?
The device includes a battery temperature monitoring pin (NTC) and thermal protection to stop the charging process if the battery temperature is out of the normal range.
