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Automotive & Transportation

100 V Synchronous Step-Down Regulator Delivers Over 93% Efficiency

23 November 2016

Linear Technology Corporation has announced the LT8630, a 600mA, 100 V input capable synchronous step-down switching regulator. Synchronous rectification delivers efficiency as high as 93%, while Burst Mode® operation keeps quiescent current under 7 µA in no-load standby conditions. Its 3 V to 100 V input voltage range makes it ideal for 48 V automotive systems, dual-battery transportation, industrial and 36 V to 72 V telecom applications.

The regulator’s internal high-efficiency switches can deliver up to 600 mA of continuous output current to voltages as low as 0.8 V. Burst Mode® operation of the LT8630 offers ultra-low quiescent current, suiting it for applications such as automotive always-on systems, which need to extend operating battery life. The unique design maintains a minimum dropout voltage, enabling it to operate with duty cycles up to 99%.

The regulator’s variable frequency boundary mode switching topology offers high efficiency over a wide range of input voltages. The LT8630 is available in a 20-lead TSSOP package with high-voltage lead spacing. It also offers a compact, thermally efficient footprint for high-voltage applications.

The LT8630 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 five mVP-P. Special design techniques enable high efficiency over a wide input voltage range, and the current mode topology of the LT8630 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 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.

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