Analog Devices LTC3877

Description

The LTC®3877 is a VID-programmable, constant frequencycurrent mode step-down controller using an advanced andproprietary architecture. This new architecture enhancesthe signal-to-noise ratio of the current sense signal, allowingthe use of very low DC resistance power inductorsto maximize efficiency in high current applications. Thisfeature also dramatically reduces the current sensing error,so that current sharing is greatly improved in multi-phaselow DCR applications. In addition, the controller achieves aminimum on-time of just 40ns, permitting the use of highswitching frequency at high step-down ratios.The LTC3877 features dual high speed remote sense differentialamplifiers, programmable current sense limitsand DCR temperature compensation to limit the maximumoutput current precisely over temperature. The LTC3877also features a precise 0.6V reference with guaranteedaccuracy of ±0.5%. The LTC3877 is available in a lowprofile 44-lead 7mm × 7mm QFN package.

Features

6-Bit Parallel VID (Voltage Identification) Inputs Set Output Voltage from 0.6V to 1.23V in 10mV StepsOutput Voltage Range: 0.6V to 5V (Without VID)Ultra Low Value DCR/RSENSE Current Sensing±1% Maximum Total Regulation Voltage Accuracy Over TemperatureDual Differential Remote Sensing AmplifierstON(MIN) = 40ns, Capable of Very Low Duty Cycles at High FrequencyPhase-Lockable Frequency from 250kHz to 1MHzCurrent Mismatch Between Channels: 5% MaxAdjustable Soft-Start Current Ramping or TrackingMulti-IC Operation Up To 12 PhasesWide VIN Range: 4.5V to 38VDual Power Good Output Voltage MonitorsOutput Overvoltage ProtectionFoldback Output Current Limiting and Soft Recovery

Typical applications

• FPGAs and Processor Power
• Servers and Computing

More information

• Datasheet
• IC product information