Step-Down Converters Save Energy and Space in IoT Devices

STMicroelectronics has announced its ST1PS01 step-down converters. The devices are engineered for small size, low quiescent current and high efficiency at all values of load current, to save energy and real-estate in keep-alive point-of-load supplies and IoT devices such as asset trackers, wearables, smart sensors and smart meters.

Leveraging synchronous rectification, efficiency is 92% at 400 mA full load and 95% when delivering just 1 mA. Power-saving design features keep the quiescent current to a miserly 500 nA and include a low-power voltage reference. There is also a pulse-frequency counter for controlling converter current at light load, with two high-speed comparators to help minimize output ripple.
Integrated feedback-loop compensation, soft-start circuitry and power switches ensure a space-saving solution that requires just a few small-outline passives to complete the circuit. The typical inductor value is 2.2 µH. In addition, output-voltage selection logic not only saves external voltage-setting components but also gives flexibility to configure modules digitally at manufacture or let the host system change the output voltage on the fly. Eight variants, each with four optional output-voltage settings, allow a choice of regulated outputs from 3.3 V to 0.62 5V. All models feature a Power-good indicator.

A wide input-voltage range, from 1.8 V to 5.5 V, further enhances flexibility for designers by allowing various battery chemistries or configurations as simple as a single lithium cell and extending runtime as the battery discharges. ST1PS01 regulators are also ideal for devices powered from energy-harvesting systems and feature a low noise-architecture that allows use in noise-sensitive applications.

An evaluation board, STEVAL-1PS01EJR, helps developers quickly understand how to take advantage of the ST1PS01’s high energy efficiency and feature integration.

ST1PS01 regulators are now in full production, packaged as 400 µm-pitch flip-chip devices measuring just 1.11 mm x 1.41 mm, and priced from $0.686 for orders of 1, 000 pieces.

STMicroelectronics | www.st.com

 

950 V Superjunction MOSFETs Boast High Thermal Efficiency

Infineon Technologies has added a new member to its CoolMOS P7 family, the 950 V CoolMOS P7 Superjunction MOSFET. It is designed to meet the needs of applications such as lighting, smart meters, mobile chargers, notebook adapters, AUX power supplies and industrial SMPS applications. This semiconductor solution combines excellent thermal and efficiency performance with lower bill of materials and overall production costs.

The 950 V CoolMOS P7 attributes include outstanding DPAK RDS(on) enabling higher density designs. In addition, the excellent VGS(th) and lowest VGS(th) tolerance make the MOSFET easy to drive and design in. Similar to the other members of the P7 family from Infineon, this component comes with integrated Zener diode ESD protection. This results in better assembly yields and therefore less cost, and fewer ESD-related production issues.

The 950 V CoolMOS P7 enables up to a 1% efficiency increase and from 2˚C to 10˚C lower MOSFET temperature for more efficient designs. This component offers also up to 58% lower switching losses compared to previous generations of the CoolMOS family. Compared to competing technologies in the market the improvement is more than 50%, according to the company.

The 950 V CoolMOS P7 comes in TO-220 FullPAK (shown), TO-251 IPAK LL, TO-252 DPAK, and SOT-223 packaging. This makes it possible to change from THD to SMD device.

Infineon Technologies | www.infineon.com