STMicroelectronics SPV1050TTR

Overview

SPV1050TTR from STMicroelectronics is an ultra-low-power, high-efficiency energy harvesting power manager IC with integrated boost/buck-boost DC-DC converter, dual independent LDOs (1.8 V and 3.3 V), programmable MPPT, and battery protection logic. It supports cold-start from as low as 0.55 V (boost) or 2.6 V (buck-boost), delivers up to 70 mA output current, and features ±1% accurate trimmable overvoltage (2.6–5.3 V) and undervoltage (2.2–3.6 V) thresholds for battery management. It is designed for IoT sensor nodes powered by thermoelectric generators or photovoltaic modules.

For engineers reviewing the SPV1050TTR datasheet, SPV1050TTR pinout, SPV1050TTR application, or SPV1050TTR equivalent, key selection considerations include cold-start voltage requirements, MPPT enable/disable flexibility via MPP_SET, STORE/BATT pass-transistor control timing, dual-LDO sequencing, and VFQFPN20 package layout constraints for low-leakage energy harvesting PCBs.

Technical Context

The SPV1050TTR implements a digitally controlled, adaptive DC-DC converter with four integrated MOSFETs-two low-side (R_ON = 0.5–1.5 Ω) and two synchronous rectifiers (R_SR-ON = 0.5–1.5 Ω in boost)-enabling configurable boost or buck-boost topologies via the CONF pin. Its internal MPPT algorithm samples open-circuit input voltage every 12–20 s for 300–500 ms, storing reference voltage on MPP_REF to dynamically adjust switching duty cycle for maximum power extraction from PV or TEG sources.

Battery protection is implemented via analog comparator-based thresholds referenced to a 1.23 V bandgap (±1% accuracy), where EOC and UVP pins interface through resistor dividers to set end-of-charge (2.6–5.3 V) and undervoltage (2.2–3.6 V) trip points. The embedded pass transistor (R_BATT = 6–8 Ω) opens/closes based on these thresholds, with open-drain BATT_CONN and BATT_CHG status flags providing real-time system-level monitoring of charge state and converter activity.

Key Specifications

Pinout & Package

SPV1050TTR is housed in a 4 mm × 4 mm VFQFPN20 package with exposed thermal pad (EP), optimized for low-thermal-resistance PCB mounting in space-constrained energy harvesting applications. Pin 17 is NC; EP must be directly connected to GND/PGND/STORE ground net without vias for optimal thermal and leakage performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar energy harvesting power management applications.

Compared with MAX17710G+T and BQ25504RGTT, SPV1050TTR uniquely combines programmable battery protection thresholds, dual independent LDOs, and topology-selectable DC-DC operation-making it the only option supporting both TEG and PV sources while delivering native multi-rail power without external regulators.

Availability

SPV1050TTR is available at Aetrix Electronics and suitable for agriculture sensors, fleet tracking units, and smart wearables requiring stable component supply across multi-year production cycles and seasonal environmental variations.

Supply support for SPV1050TTR 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 power management, microcontrollers, and sensing technologies for industrial, automotive, and IoT markets.

The SPV1050 belongs to ST's ultra-low-power energy harvesting product line, engineered specifically to replace battery-only power in maintenance-free wireless sensor networks by maximizing efficiency from microwatt-scale ambient sources.

FAQ

What is the minimum input voltage required for cold-start in buck-boost mode?

The SPV1050TTR requires 2.6 V (typical) at the IN_HV pin for cold-start in buck-boost configuration, with a maximum input rating of 18 V. This mode is selected by tying the CONF pin to ground. Below 2.6 V, the device remains in shutdown with <1 nA current draw until sufficient input energy accumulates.

How does the MPPT function interact with the DC-DC converter during operation?

When MPPT is enabled (MPP_SET connected to MPP via resistor ladder), the SPV1050TTR suspends DC-DC switching for 300–500 ms every 12–20 s to sample open-circuit input voltage and store it on the MPP_REF capacitor. After sampling, it resumes switching with duty cycle adjusted to maintain input voltage near the stored reference-ensuring continuous power optimization without firmware intervention.

Can the 1.8 V and 3.3 V LDOs be used simultaneously with independent control?

Yes-the SPV1050TTR provides two fully independent LDOs with separate enable pins (LDO1_EN and LDO2_EN). Both can be active simultaneously, delivering up to 200 mA each, and may be toggled individually to manage subsystem power states. Their dropout is guaranteed at 0.5% across load and input voltage ranges, ensuring stable rail integrity during dynamic load transients.

What is the purpose of the BATT_CONN and BATT_CHG open-drain pins?

BATT_CONN signals battery connection status (low = pass transistor closed, battery charging; high = open, battery disconnected), while BATT_CHG indicates DC-DC activity (low = switching active; high = idle). Both are open-drain and require 10 MΩ pull-ups to STORE. They enable host MCUs to monitor charge state and converter health without analog ADC reads-reducing system complexity and power consumption.