36-V, 1-A step-down synchronous regulator simplifies intermediate power bus and point-of-load power designs

July 18, 2012 // By Paul Buckley
Analog Devices, Inc. has introduced the ADP2441, DC-to-DC switching regulator which is a 36-V, 1-A (amp) step-down regulator integrates both low-on-resistance and high-side and low-side power switches to provide compact point-of-load design and offers more than 94 percent efficiency.

Under light load conditions, the ADP2441 will automatically operate in PSM (pulse-skip mode) to reduce switching losses and improve energy efficiency.

The ADP2441 supports a wide input range from 4.5 V to 36 V to accommodate a diversity of point-of-load applications including industrial and communication equipment and healthcare electronics. Output voltage is adjustable from 0.6 V to 90 percent of input voltage. The new regulator also offers low minimum on-time of 50 ns saving valuable board space and cost through its suitability for single-stage, high input to low output power conversion.

By using a current-mode constant frequency PWM (pulse-width modulation) control scheme, the ADP2441 offers excellent stability and transient response to minimise the output voltage ripple. The switching frequency of the regulator can be adjusted from 300 kHz to 1 MHz. The new regulator also offers precision enable, voltage tracking and power-good features to enable a simple and reliable start-up sequence. System reliability and protection are enhanced further through over-current protection, under-voltage lockout and thermal shutdown. 

The ADP2441 operates over the −40 to +125°C junction temperature range and is available in compact 3 mm × 3 mm 12-lead LFCSP package. Analog Devices’ integrated power management switching regulators are also supported by the ADIsimPower design tools, which makes selecting components, simulating power supply performance and building evaluation circuits easy and fast.
Availability and Pricing

The ADP2441 packaged in a 3 mm × 3 mm 12 lead LFCSP is available now priced at $1.78 each per 1k units.

More information about the ADP2441 DC-to-DC switching regulator at