ADI LTC7815HUHF#TRPBF

The LTC7815 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 2.25MHz. The LTC7815 operates from a wide 4.5 V to 38 V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7815 can operate from an input supply as low as 2.5V after start-up. The 28μA no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7815 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 light loads.

• Dual Buck Plus Single Boost Synchronous Controllers
• Wide Bias Input Voltage Range: 4.5V to 38V
• Outputs Remain in Regulation Through Cold Crank Down to a 2.5V Input Supply Voltage
• Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
• Boost Output Voltage Up to 60V
• Low Operating IQ: 28μA (One Channel On)
• RSENSE or DCR Current Sensing
• 100% Duty Cycle for Boost Synchronous MOSFET Even in Burst Mode Operation
• Phase-Lockable Frequency (320kHz to 2.25MHz)
• Programmable Fixed Frequency (320kHz to 2.25MHz)
• Very Low Buck Dropout Operation: 98% Duty Cycle
• Small 38-Lead 5mm × 7mm QFN Package

• Automotive Always-On and Start-Stop Systems
• Battery Operated Digital Devices
• Distributed DC Power Systems
• Multioutput Buck-Boost Applications