LTC3859A Datasheet | Linear Technology

Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller with Improved Burst Mode Operation Features DESCRIPTION n Dual Buck Plus Single Boost Synchronous Controllers n Outputs Remain in Regulation Through Cold Crank Down to 2.5V n Low Operating IQ: 55μA (One Channel On) n Wide Bias Input Voltage Range: 4.5V to 38V n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n Boost Output Voltage Up to 60V n RSENSE or DCR Current Sensing n 100% Duty Cycle for Boost Synchronous MOSFET Even in Burst Mode® Operation n Phase-Lockable Frequency (75k Hz to 850k Hz) n Programmable Fixed Frequency (50k Hz to 900k Hz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode Operation at Light Loads n Very Low Buck Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Low Shutdown IQ: 14μA n Small 38-Pin 5mm × 7mm QFN and TSSOP Packages APPLICATIONS n Automotive Always-On and Start-Stop Systems n Battery Operated Digital Devices n Distributed DC Power Systems n Multioutput Buck-Boost Applications The LTC®3859A is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 850k Hz. The LTC3859A operates from a wide 4.5V to 38V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC3859A can operate from an input supply as low as 2.5V after start-up. The 55μA no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3859A Features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at...