20A, 16V, Single- or Dual Phase, Silent Switcher Step-Down Regulators with Digital Power System Management

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.

APPLICATIONS

* Communications, Storage, and Industrial Systems

* Data Center and Solid-State Drives

* Silent Switcher® Architecture: Enables a Compact, Efficient, Low EMI Solution

* PMBus/I2C Serial Interface

* 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