Features

• 8A Output Current
• Wide V_IN Range = 4V to 18V
• Internal N-Channel MOSFETs
• True Current Mode Control
• Optimized for High Step-Down Ratios
• t_ON(MIN) ≤ 100nsec
• Extremely Fast Transient Response
• Stable with Ceramic C_OUT
• ±1% 0.6V Voltage Reference
• Power Good Output Voltage Monitor
• Adjustable On-Time/Switching Frequency
• Adjustable Current Limit
• Programmable Soft-Start
• Output Overvoltage Protection
• Optional Short-Circuit Shutdown Timer
• Low Shutdown I_Q: 15μA
• Available in a 7mm × 8mm 52-Lead QFN Package

Typical Application

Description

The LTC3608 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 8A output current from a 4V to 18V (20V maximum) input supply. It uses a valley current 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 LTC3608 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 LTC3608 is available in a compact 7mm × 8mm QFN package.