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Step-down DC/DC regulator operates within 3.6-25V

Posted: 08 Feb 2008     Print Version  Bookmark and Share

Keywords:step-down DC/DC  switching regulators  power sources 

Linear Technology Corp. has announced the LT1913, a 3.5A, 25V step-down switching regulator packaged in a 3-by-3mm DFN.

The LT1913 operates within a Vin range of 3.6-25V, making it suitable for regulating power from a wide variety of sources, including protected automotive batteries, industrial supplies and unregulated wall adapters. Its 4.6A internal switch can deliver up to 3.5A of continuous output current at voltages as low as 0.79V. The LT1913's switching frequency is user programmable from 200kHz to 2.4MHz, enabling designers to optimise efficiency while avoiding critical noise-sensitive frequency bands and keeping externals small. The combination of its high switching frequency and tiny package ensure a compact solution footprint.

The LT1913 uses a high-efficiency 4.6A, 95mΩ switch that can deliver up to 90 per cent efficiency. The necessary boost diode, oscillator, control and logic circuitry are integrated into a single chip. Special design techniques used in the LT1913 enable high efficiency over a wide input voltage range, and the device's current mode topology enables fast transient response and excellent loop stability. Other features include external synchronisation (from 250kHz to 2MHz), a power good flag and soft-start capability.

Pricing for the LT1913EDD starts at Rs.144.10 ($3.65) each for 1,000-piece quantities. The LT1913IDD is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at Rs.172.92 ($4.38) each in 1,000-piece quantities. Both versions are available from stock.




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