Features

• High Efficiency: Up to 96%
• 7A Output Current at VIN = 3V
• Adjustable Frequency: 1.5MHz Nominal
• PolyPhase Operation (Up to 12 Phases)
• Spread Spectrum Frequency Modulation
• Output Tracking and Margining
• ±1% Reference Accuracy
• 2.5V to 5.5V VIN Range
• Phase Lockable from 0.75MHz to 2.25MHz
• Selectable Burst Mode® Operation
• Low Dropout Operation: 100% Duty Cycle
• Low Quiescent Current: 450µA
• Current Mode Operation for Excellent Line and Load Transient Response
• Shutdown Mode Draws Only 0.2µA Supply Current
• Available in 38-Pin (5mm × 7mm) QFN Package

Typical Application

Description

The LTC3415 is a high efficiency, monolithic synchronous buck regulator using a phase lockable constant frequency, current mode architecture. PolyPhase® operation allows multiple LTC3415s to run out of phase while using minimal input and output capacitance. The operating supply range is from 5.5V down to 2.5V, making it suitable for single Lithium-Ion battery as well as point of load power supply applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation that extends operating time in battery-operated systems.

The operating frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors. For switching- noise sensitive applications, it can be externally synchronized from 0.75MHz to 2.25MHz. The PHMODE pin allows user control of the phase of the outgoing clock signal. The current sense comparator is factory trimmed for accurate output current sharing. Burst Mode operation is inhibited during synchronization or when the MODE pin is pulled low to reduce noise and RF interference.