DC/DC converter offers quiescent current of only 75uA
27 January 2009
A 1A, 36V input step-down switching regulator with input transient protection up to 60V.
The LT3682 from Linear Technology uses a high efficiency 1.5A, 480mOhm switch, with the boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple BurstMode operation maintains high efficiency at low output currents while keeping output ripple below 15mVPK-PK.
Features include external synchronisation (from 300kHz to 2.2MHz), a power good flag and soft-start capability. Its Burst Mode operation keeps quiescent current under 75uA in no load standby conditions. The LT3682’s 3.6V to 36V input voltage range, with 60V transient ride through, makes it ideal for load dump and cold-crank conditions commonly found in automotive applications.
Its 1.5A internal switch can deliver up to 1A of continuous output current to voltages as low as 0.8V. The LT3682’s BurstMode operation offers ultralow quiescent current, which is suited to applications such as automotive, or telecom systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 250kHz to 2.2MHz enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 10pin 3mm x 4mm DFN-14 package and high switching frequency keeps external inductors and capacitors small, providing a very compact, thermally efficient footprint.
The LT3682EDE is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature.
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