Power Electronics
Step-Down Switching Regulator Draws Low Quiescent Current

Step-Down Switching Regulator Draws Low Quiescent Current

The LT3995 step-down switching regulator from Linear Technology Corporation is rated 3 A at 60 V and requires only 2.7µA of quiescent current. The LT3995’s 4.3 V to 60 V input voltage range makes it ideal for automotive, commercial vehicle, avionic and industrial applications. Its internal 4.7A switch can deliver up to 3 A of continuous output current to voltages as low as 1.2 V. The LT3995’s Burst Mode® operation offers ultralow quiescent current, making it well suited for applications such as automotive or industrial systems, which demand always-on operation and optimum battery life.

The unique design of the LT3995 ensures a minimum dropout voltage of only 500mV even when the input voltage drops below the programmed output voltage, suitable for applications subjected to scenarios such as automotive cold-crank. Switching frequency is user-programmable from 200kHz to 2MHz, and synchronizable from 250 kHz to 2 MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 16-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small, providing a highly compact, thermally efficient footprint.

The LT3995 utilizes a high efficiency 4.7 A, 85 mΩ switch, with the boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15 mVP-P. Special design techniques and a new high voltage process enable efficiencies up to 90% over a wide input voltage range, while the LT3995’s current mode topology assures fast transient response and excellent loop stability. Other features include a power good flag, soft-start capability and thermal protection.

The LT3995EMSE is packaged in a thermally enhanced MSOP-16, priced starting at $3.55 each for 1,000 piece quantities. The LT3995IMSE is tested and guaranteed to operate from a -40 °C to 125 °C operating junction temperature and is priced at $3.91 each in 1,000 piece quantities. The LT3995HMSE is tested and guaranteed to operate from a -40 °C to 150 °C operating junction temperature, priced at $4.16 each in 1,000 piece quantities. All versions are available from stock.

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