LTC7151S Datasheet

• Silent Switcher^®2 Architecture for Low EMI
• V_IN Range: 3.1V to 20V
• V_OUT Range: 0.5V to 5.5V
• Differential V_OUT Remote Sense
• Adjustable Frequency: 400kHz to 3MHz
• PolyPhase^® Operation: Up to 12 Phases
• Output Tracking and Soft-Start
• Reference Accuracy: ±1% Overtemperature
• Current Mode Operation for Excellent Line and Load Transient Response
• Accurate 1.2V Run Pin Threshold
• Supports Forced Continuous/Discontinuous Modes
• 28-Lead Thermally Enhanced 4mm × 5mm × 0.74mm LQFN Package

• Automotive and Industrial Power Supplies
• Server Power Applications
• Distributed Power Systems
• Point-of-Load Supply for ASIC, FPGA, DSP, µP, etc.

The LTC7151S is a high efficiency monolithic synchronous buck regulator capable of delivering 15A to the load. It uses a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC7151S regulators to run out-of-phase, which reduces the amount of input and output capacitors required. The operating supply voltage range is from 3.1V to 20V.

The operating frequency is programmable from 400kHz to 3MHz with an external resistor. The high frequency capability allows the use of physically smaller inductor and capacitor sizes. For switching noise sensitive applications, the LTC7151S can be externally synchronized from 400kHz to 3MHz. The PHMODE pin allows the user control of the phase of the outgoing clock signal. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. The LTC7151S uses second generation Silent Switcher 2 technology including integrated bypass capacitors to deliver a highly efficient solution at high frequencies with excellent EMI performance.