Buck Regulators

Optimized for isolated buck regulator designs, the new A6986I and L6986I DC/DC converters boast a wide input-voltage range and low quiescent current to ensure robust and energy-efficient operation in automotive and industrial applications up to 5W.

The isolated buck topology drastically lowers the bill of materials in systems that require a regulated non-isolated primary voltage and one or more isolated secondary voltages.

Evaluation boards are also available to help developers build and verify their designs.

STEVAL-A6986IV1, STEVAL-A6986IV2

The new L6981 is an  easy-to-use regulator delivering high efficiency capability across all loads. The wide input voltage range (3.5 V - 38V) makes it the ideal solution for 24 V industrial bus-powered systems, HVAC power supplies, battery-powered equipment, decentralized intelligent nodes and always-on devices like smart sensors.

Housed in an SO8 package , the L6981 is based on peak current mode architecture with internal compensation to help reduce the overall size and complexity of the end-product designs.

Evaluation boards are available, to support developers in their designs.

STEVAL-L6981CDR ; STEVAL-L6981NDR

Boasting a quiescent current of only 500 nA, ST’s miniaturized ST1PS01 and ST1PS02 step-down converters with digital voltage selection specifically address battery-powered and energy-harvesting applications, thanks also to their high efficiency over a wide range of operating conditions.

The integrated power switch and compensation network allow this new generation of step-down converters to work with only just a few external components.

Evaluation boards are available for both products, to support developers in their designs.

STEVAL-1PS01AJR ; STEVAL-1PS01DJR ; STEVAL-1PS01EJR ; STEVAL-1PS02B

Housed in a HTSSOP16-package, the A7987 is a 3 A step-down switching regulator with a wide input-voltage range, making it suitable for 24 V battery-powered applications.

Specifically recommended to design flexible and robust solutions, the A7987 also offers a set of additional functionalities including adjustable current limit, synchronization with a 180° phase shift, and power sequencing.

These key features ensure flexible and stable performance when several voltage rails are powered up in automotive applications such as body infotainment and telematics.

In the quest for higher efficiency and compact form factor in their DC-DC supply designs, engineers now have a few more allies: the L6985F, L6986F and L6986 step-down DC-DC regulators with synchronous rectification and an output current of 0.5 A, 1,5 A and 2 A respectively.
Based on a peak current mode architecture with a p-channel power MOSFET, they feature a selectable low-consumption-mode (LCM burst mode) to increase efficiency at light load, and a low-noise-mode (LNM with fixed PWM switching frequency) for noise-sensitive designs.

An easy-to-use evaluation board (STEVAL-ISA156V1) based on the L6986 regulator is available to help you configure and evaluate application parameters so you can reach higher efficiency, higher power density and lower standby power designs.