LT7171/LT7171-1 Series
20A, 16V, Single- or Dual Phase, Silent Switcher Step-Down Regulators with Digital Power System Management
Manufacturer: Analog Devices
Catalog
20A, 16V, Single- or Dual Phase, Silent Switcher Step-Down Regulators with Digital Power System Management
Key Features
• Silent Switcher®Architecture: Enables a Compact, Efficient, Low EMI Solution
• PMBus/I2C Serial InterfaceTelemetry Read Back includes VOUT, IOUT, VIN, Die
• Temperature, and FaultsProgrammable Voltage, Current Limit, Sequencing, Soft Start and Stop, Undervoltage
• and Overvoltage, Phase, Frequency (up to 4MHz), and Loop CompensationIntegrated Three Times Programmable NVMKey Parameters Selectable by Resistor
• Telemetry Read Back includes VOUT, IOUT, VIN, Die
• Temperature, and Faults
• Programmable Voltage, Current Limit, Sequencing, Soft Start and Stop, Undervoltage
• and Overvoltage, Phase, Frequency (up to 4MHz), and Loop Compensation
• Integrated Three Times Programmable NVM
• Key Parameters Selectable by Resistor
• VOUTSet Point Range: 0.4V to 5.5V
• VOUTAccuracy: ±0.25%, 0.6V ≤ VOUT≤ 1.375V
• PolyPhase Load Sharing up to Four Devices
• Differential Remote VOUTSense
• Fast Transient Response
• Wide VINSupply Range: Down to 2.9V or 1.5V with EXTVCC
• Programmable and Synchronizable: 400kHz to 4MHz
• 30-lead (3.5mm × 4mm) LQFN
Description
AI
The LT7171/LT7171-1 are monolithic PolyPhase DC/DC synchronous step-down regulators that deliver up to 20A of continuous output current. The LT7171-1 option has two switching phases that are connected to two inductors to drive a single-regulated output supply. The quick, clean, low-overshoot switching edges deliver high efficiency while minimizing electromagnetic interference (EMI) emissions. The I2C-based PMBus 1.3-compliant serial interface enables control of device functions while providing telemetry information for system monitoring. The LT7171/LT7171-1 are supported by the LTpowerPlay®graphical user interface (GUI) tool.The controlled on-time valley current-mode control with 25ns typical minimum on-time enables a high switching frequency (fSW) at a low output voltage (VOUT) with excellent transient response in a small overall solution size.VOUT, fSW, and phase are selectable using external configuration resistors. Settings can also be set via the PMBus interface or stored in the on-chip, three times programmable nonvolatile memory (NVM).The LT7171/LT7171-1 use forced-continuous switching operation.APPLICATIONSCommunications, Storage, and Industrial SystemsData Center and Solid-State Drives