Analog Devices LTC3613

Description

The LTC®3613 is a monolithic synchronous step-down switching regulator capable of regulating outputs from 0.6V to 5.5V with up to 15A output current. The controlled on-time constant frequency valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load. This also provides excellent current sharing capability.Differential output voltage sensing along with a precision internal reference combine to offer ±0.67% output regulation, even if the output ground reference deviates from local ground by 500mV. The switching frequency can be programmed from 200kHz to 1MHz with an external resistor.The switching frequency is also phase synchronizable to an external clock in applications where switching noise/ EMI reduction is crucial.Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up is provided for tracking and sequencing applications. Safety features include output overvoltage protection, programmable current limit with foldback, and power good monitoring.

Features

• Wide VIN Range: 4.5V to 24V;
• VOUT Range: 0.6V to 5.5V at up to 15A
• 0.67% Output Voltage Accuracy
• Controlled On-Time Valley Current Mode Architecture,
• Excellent Current Sharing Capability
• Frequency Programmable from 200kHz to 1MHz and Synchronizable to External Clock
• RSENSE or Inductor DCR Current Sensing With
• Accurate Current Limit
• Fast Transient Response
• Differential Output Voltage Sensing Allowing 500mV
• Common Mode Remote Ground
• tON(MIN) = 65ns; tOFF(MIN) = 105ns
• Overvoltage Protection and Current Limit Foldback
• Power Good Output Voltage Monitor
• Voltage Tracking Start-Up
• External VCC Input for Bypassing Internal LDO
• Micropower Shutdown: IQ = 15μA
• 7mm × 9mm 56-pin QFN Package

Typical applications

• Point-of-Load Converters
• Servers
• Distributed Power System

More information

• Datasheet
• IC product information