The LT7170/LT7170-1 are monolithic DC/DC synchronous stepdown regulators that deliver up to 20 A of continuous output current. The LT7170-1 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 LT7170/LT7170-1 are supported by the LTpowerPlay®graphical user interface (GUI) tool.The controlled on-time valley current-mode control with 25 ns 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).To guarantee clean start-up of the powered devices, the LT7170/ LT7170-1 actively pull down the output using VSENSEPwhen the output is disabled. The LT7170/LT7170-1 wait until the VOUTis less than 0.2 V before enabling the output and beginning a soft start. This VOUTdischarge threshold is programmable from 0.2 V to 2.2 V. The LT7170/LT7170-1 use forced-continuous switching operation.