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Buck regulator offer 100 percent duty cycle

Posted: 12 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? buck regulator? el7532?

Intersil Corp. has developed a 2A integrated FET synchronous buck regulator with internal compensation and 100 percent duty cycle.

The EL7532 delivers 2A of continuous output current and operates with an input range between 2.5V and 5.5V over an ambient temperature range of -40C to 85C. The device is able to achieve the 2A of continuous current rating over the full operating temperature range due to the fused lead package. Compared with a regular MSOP-10 package, the fused lead package provides lower thermal resistance, resulting in lower die temperature, Intersil said.

Additionally, the output can be externally set from 0.8V to Vin with a resistive divider. Using an internal oscillator, the EL7532 operates at a switching frequency of 1.5MHz with up to 94 percent efficiency. According to the company, this high switching frequency reduces the inductor cost and the size of the inductor and capacitors. In addition, a sync pin allows for synchronization to an external clock operating up to 12MHz, enabling placement of the switching noise outside of frequency bands critical to the application. Other features include a shut-down mode in which the device only draws 1?A of supply current, an external enable control, and an integrated power-on-reset function with a fixed 100ms delay. The regulator also provides various protection features including over-current, over-voltage and thermal shutdown at a die temperature greater than 145C.

Housed in a compact 10-pin MSOP package, the EL7532 requires as few as seven external passive components to provide a complete dc-dc buck regulator solution, and is priced at $2.30 in 1,000-unit volume orders. The datasheet, application brief and demo boards are already available.

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