Overview
The SPV1050TTR, produced by STMicroelectronics, is an ultra-low power and high-efficiency power manager designed for energy harvesting and battery charging applications. It integrates four MOSFETs for boost or buck-boost DC-DC converter configurations and an additional transistor for load connection/disconnection. The device features an internal high accuracy Maximum Power Point Tracking (MPPT) algorithm to maximize power extraction from sources such as PV panels or thermoelectric generators (TEGs). It ensures tight monitoring of the end-of-charge voltage (VEOC) and the minimum battery voltage (VUVP) to preserve battery life.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 75 mV to 18 V | V |
| Maximum Battery Charging Current | Up to 70 mA | mA |
| Battery Charge Voltage Range | 2.6 V to 5.3 V (± 1% accuracy) | V |
| Battery Discharge Voltage Range | 2.2 V to 3.6 V (± 1% accuracy) | V |
| LDO Outputs | 1.8 V and 3.3 V | V |
| Operating Temperature Range | -40°C to 125°C | °C |
| Pass Transistor Resistance | 6 to 8 Ω | Ω |
| Cold Start Input Voltage (Boost Configuration) | 550 mV | V |
| Cold Start Input Current (Boost Configuration) | 30 μA | μA |
Key Features
- Transformerless thermoelectric generators and PV modules energy harvester
- High efficiency for any harvesting source
- Fully integrated MOSFETs for Boost or Buck-boost configurations
- Selectable enable/disable MPPT functionality
- Programmable MPPT by external resistors
- Load disconnect function to avoid battery lifetime shortening
- Battery Connected and DC-DC switching open drain indication pins
- Two fully independent LDOs (1.8 V and 3.3 V output)
- Enable/disable LDO control pins
Applications
- Wireless Sensor Networks (WSN)
- Building and home automation
- Industrial control and remote metering
- Lighting, security, and surveillance systems
- Wearable and biomedical sensors, fitness trackers
- Internet of Things (IoT) devices
- Fleet and livestock tracking
- Agriculture sensors
- Smart watches and electronic labels
Q & A
- What is the primary function of the SPV1050TTR?
The SPV1050TTR is an ultra-low power energy harvester and battery charger designed to maximize power extraction from sources like PV panels or TEGs.
- What are the input voltage ranges for the SPV1050TTR?
The input voltage range is from 75 mV to 18 V.
- What is the maximum battery charging current of the SPV1050TTR?
The maximum battery charging current is up to 70 mA.
- How can the MPPT functionality be controlled in the SPV1050TTR?
The MPPT functionality can be enabled or disabled by setting the MPP_SET pin, and it can be programmed by external resistors.
- What are the output voltages of the LDOs in the SPV1050TTR?
The SPV1050TTR features two fully independent LDOs with output voltages of 1.8 V and 3.3 V.
- What is the purpose of the load disconnect function in the SPV1050TTR?
The load disconnect function is designed to avoid battery lifetime shortening by disconnecting the load prior to the first start-up (Cold Start).
- What types of batteries can be charged using the SPV1050TTR?
The SPV1050TTR can charge any battery type, including lithium-based, solid-state thin film, and super-capacitors.
- What is the operating temperature range of the SPV1050TTR?
The operating temperature range is from -40°C to 125°C.
- How does the SPV1050TTR protect the battery during charging and discharging?
The device protects the battery by tightly monitoring the end-of-charge voltage (VEOC) and the minimum battery voltage (VUVP), and by opening the pass-transistor at the triggering of these thresholds.
- Can the SPV1050TTR be used in various configurations?
Yes, the SPV1050TTR can be configured as either a boost or buck-boost DC-DC converter by setting the CONF pin accordingly.
