Features

• 10A Output Current
• Wide V_IN Range = 4.5V to 32V (36V Maximum)
• Internal N-Channel MOSFETs
• True Current Mode Control
• Optimized for High Step-Down Ratios
• t_0N(MIN) ≤ 100ns
• Extremely Fast Transient Response
• Stable with Ceramic C_OUT
• ±1% 0.6V Voltage Reference
• Power Good Output Voltage Monitor
• Adjustable On-Time/Switching Frequency (>1MHz)
• Adjustable Current Limit
• Programmable Soft-Start
• Output Overvoltage Protection
• Optional Short-Circuit Shutdown Timer
• Low Shutdown IQ: 15μA
• Available in a 9mm × 9mm 64-Pin QFN Package

Typical Application

Description

The LTC3611 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 10A output current from a 4.5V to 32V (36V maximum) input supply. It uses a constant on-time valley current mode control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is compensated for variations in V_IN and V_OUT.

The LTC3611 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The LTC3611 is available in a compact 9mm × 9mm QFN package.