LTC7811IUJ#PBF

LTC7811 is a high performance triple output (buck/ buck/boost) DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Its constant frequency current mode architecture allows a phase-lockable switching frequency of upto 3MHz. It operates from a wide 4.5V to 40V input supply range. When biased from the output of the boost converter or another auxiliary supply, this device can operate from an input supply as low as 1V after start-up. The very low no-load quiescent current extends operating run time in battery powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. It features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. It is used in applications such as automotive and transportation, industrial, military/avionics etc.

• Outputs remain in regulation through cold crank down to 1V input supply voltage
• Boost output voltage limited only by external components
• Spread spectrum operation, RSENSE or DCR current sensing
• Selectable continuous, pulse-skipping, or Low Ripple Burst Mode® operation at light loads
• Boost channel current monitor output
• Programmable frequency is 100KHz typ at (RFREQ = 374Kohm, PLLIN/SPREAD = 0V)
• VBIAS shutdown current is 1.5µA typ at (RUN1, 2, 3 = 0V, TA = 25°C)
• Operating temperature range from -40°C to 125°C
• Package style is 40-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party