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Step-down regulator offers transient protection up to 70V

Posted: 24 Nov 2010     Print Version  Bookmark and Share

Keywords:step-down  switching regulator  dual linear controller 

Linear Technology Corp. offers the LT3694, a step-down switching regulator with dual linear controllers that operates over 4V to 36V and whose transient protection of up to 70V makes it suitable for load dump and cold-crank conditions found in automotive applications.

The 36V step-down switching regulator has an internal 3.5A switch that can deliver up to 2.6A of continuous output current at voltages as low as 0.75V. Its switching frequency is user-programmable from 250kHz to 2.5MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands.

LT3694 step-down switching regulator

Each integrated LDO controller has an accurate programmable current limit up to 1A to provide an additional level of reliability. Combined with NPN transistors, they can be used to offer dual low noise outputs in addition to the primary channel. Although the LDO controllers can be powered by independent inputs, powering them from the primary switching output ensures both high efficiency and low noise. The combination of its 4mm x 5mm QFN package (or thermally enhanced TSSOP-20E) and high switching frequency, which keeps external capacitors and inductors small, provides a compact, thermally efficient footprint.

The LT3694's main switcher utilises a high efficiency 3.5A switch, with the necessary oscillator, control, logic circuitry and LDO controllers integrated into a single die. Special design techniques enable high efficiency over a wide input voltage range and its current mode topology enables fast transient response and excellent loop stability. A diode current limit pin offers an additional level of overload protection. Other features include a power good flag, independent tracking/soft-start pins and programmable under-voltage lockout.

The LT3694 also provides synchronisation capability. The LT3694-1 version is available if a clock output signal is required to synchronise other external devices.

The LT3694EUFD and LT3694-1EUFD are offered in a 4mm x 5mm 28-lead QFN package, priced at Rs.171.98 ($3.85) each. The LT3694EFE and LT3694-1EFE are offered in a 20-lead, thermally enhanced TSSOP package, priced at Rs.178.68 ($4.00) each. The LT3694IUFD and LT3694-1IUFD are tested and guaranteed to operate from a -40°C to 125°C operating junction temperature, priced at Rs.189.40 ($4.24) each.

The LT3694IFE and LT3694-1IFE are tested and guaranteed to operate from a -40°C to 125°C operating junction temperature. Both are offered in a 20-lead, thermally enhanced TSSOP package and are priced from Rs.178.68 ($4.00) each. All prices are for 1,000-piece quantities and all versions of the LT3694 are available from stock

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