Step-down converter offers high efficiency, low no-load current

November 22, 2016 // By Christoph Hammerschmidt
Targeting – among other applications – 48V automotive systems in the micro hybrid class, Linear Technology’s new LT8630 synchronous step-down switching regulator offers an energy efficiency as high as 93% and a no-load standby current as low as 7µA, making it ideally suited for automotive always-on systems.

The LT8630 has a wide input voltage range from 3V to 100V which covers dual battery transportation, industrial and telecommunications applications. Its internal switches can deliver up to 600mA of continuous output current to voltages as low as 0.8V. The chip’s unique design maintains a minimum dropout voltage, enabling it to operate with duty cycles up to 99%. Its variable frequency boundary mode switching topology offers high efficiency over a wide range of input voltages. The LT8630’s 20-lead TSSOP package with high voltage lead spacing offers a compact, thermally efficient footprint for high voltage applications.

The device utilizes internal top and bottom high efficiency power switches with the necessary 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 5mVp-p. Special design techniques enable high efficiency over a wide input voltage range, and the LT8630’s current mode topology enables fast transient response and excellent loop stability. Other features include robust short-circuit protection, a power good flag, output voltage tracking and thermal protection

The LT8630EFE is packaged in a thermally enhanced TSSOP-20 package. An industrial temperature version, the LT8630IFE, is tested and guaranteed to operate from –40°C to 125°C operating junction temperature. Pricing starts at $3.60 each in 1,000-piece quantities and all versions are available from stock.

For more information, visit www.linear.com/product/LT8630.