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350 mA synchronous step-down DC/DC, for automotive voltages

350 mA synchronous step-down DC/DC, for automotive voltages

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By Graham Prophet



Burst Mode operation keeps quiescent current under 3 µA in no-load standby conditions, for always-on systems. Its 3.0V to 42V input voltage range makes it suitable for automotive applications which must regulate through cold-crank and stop-start scenarios with minimum input voltage as low as 3.0V and load dump transients in excess of 40V. Its internal 650 mA switches deliver up to 350 mA of continuous output current. The LT8606 maintains a minimum dropout voltage of 175 mV (at 300mA) under all conditions. Spread spectrum frequency modulation and other design techniques offer low EMI operation, enabling it to meet CISPR25, Class 5 EMI limits required by many automotive and industrial applications. A fast minimum on-time of 45 nsec enables 2MHz constant frequency switching from a 16V input to a 1.5V output. The LT8606’s 2 x 2 mm 8-lead DFN or 10-lead thermally enhanced MSOP package and high switching frequency, which keeps the external inductor and capacitors small, provide a compact, thermally efficient footprint.

 

The LT8606 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 10 mVP-P. Current mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, a power good flag, output soft-start/tracking and thermal protection.

 

The LT8606EDC is packaged in a 2mm x 2mm 8-lead DFN package and the LT8606EMSE is offered in a thermally enhanced MSOP-10 package. Industrial temperature versions, the LT8606IDC and LT8606IMSE, are tested and guaranteed to operate from a –40°C to 125°C operating junction temperature. Pricing starts at $2.05 (1111).

 

Analog Devices/Linear Technology; www.linear.com/product/LT8606

 

 

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