Power Electronics

36V Input with 60V Transient Protection, 2.2MHz Step-Down DC/DC Converter

Linear Technology Corporation’s LT3682 is a 1A, 36V input step-down switching regulator with input transient protection up to 60V. 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 well suited for 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 optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 3mm x 4mm DFN-14 package and high switching frequency keeps external inductors and capacitors small, providing a very compact, thermally efficient footprint.

The LT3682 utilizes 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 15mV PK-PK. Special design techniques and a new high voltage process enable high efficiency over a wide input voltage range while its current mode topology enables fast transient response and excellent loop stability. Other features include external synchronization (from 300kHz to 2.2MHz), a power good flag and soft-start capability.

The LT3682EDE pricing starts at $2.95 each for 1,000 piece quantities. The LT3682IDE is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $3.95 each in 1,000 piece quantities. All versions are available from stock.

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