LT7170/LT7170-1 Series

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

Catalog

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

Part	Output Configuration	Voltage - Output (Max) [Max]	Supplier Device Package	Number of Outputs	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Synchronous Rectifier	Topology	Output Type	Current - Output	Voltage - Input (Min) [Min]	Frequency - Switching [Min]	Frequency - Switching [Max]	Package / Case	Voltage - Input (Max) [Max]	Function	Voltage - Output (Min/Fixed)
Analog Devices LT7170RV-1#TRMPBF	Positive	5.5 V	24-LQFN (3.5x4)	1	Surface Mount	150 °C	-40 °C		Buck	Programmable	20 A	2.9 V	400 kHz	4 MHz	24-PowerTFQFN	16 V	Step-Down	0.4 V
Analog Devices LT7170RV#TRMPBF

Catalog

20 A, 16 V, 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 4 MHz), and loop compensationIntegrated three times programmable NVM

• 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 4 MHz), and loop compensation

• Integrated three times programmable NVM

• Key parameters selectable by resistor

• VOUTset point range: 0.4 V to 5.5 V

• VOUTaccuracy: ±0.25%, 0.6 V ≤ VOUT≤ 1.375 V

• Differential remote VOUTsense

• Fast transient response

• Wide VINsupply range: down to 2.9 V or 1.5 V with EXTVCC

• Programmable and synchronizable: 400 kHz to 4 MHz

• 24-lead (3.5 mm × 4 mm) LQFN package

Description

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.