Analog Devices Inc. LT7171RV-1#TRPBF

Overview

LT7171RV-1#TRPBF from Analog Devices is a monolithic dual-phase synchronous step-down regulator delivering up to 20A continuous output current at 0.4V–5.5V with ±0.25% accuracy (0.6V–1.375V), 400kHz–4MHz programmable switching frequency, and integrated three-times programmable NVM for digital power system management in high-density server and storage power rails.

For engineers reviewing the LT7171RV-1#TRPBF datasheet, LT7171RV-1#TRPBF pinout, LT7171RV-1#TRPBF application, or LT7171RV-1#TRPBF equivalent, key selection criteria include dual-phase valley-current-mode control, PMBus 1.3 compliance, differential remote sensing, forced-continuous operation, and Silent Switcher® EMI reduction architecture.

Technical Context

The LT7171RV-1#TRPBF implements controlled-on-time valley current-mode control with 25ns typical minimum on-time, enabling high-frequency operation at low VOUT while maintaining fast transient response. Its dual-phase architecture supports PolyPhase load sharing across up to four devices via SHARE_CLK and SYNC pins.

Telemetry includes real-time readback of VOUT, IOUT, VIN, die temperature, and fault status over PMBus/I²C. Configuration is supported by resistor programming (VOUT_CFG, PWM_CFG, ASEL), internal NVM storage, and external compensation via ITH pin with selectable gMEA (37.5μS–4.8mS).

Key Specifications

Pinout & Package

LT7171RV-1#TRPBF is housed in a 30-lead, 3.5mm × 4mm LQFN package with exposed thermal pad (Pin 36) for enhanced thermal performance. The package features dedicated PGND (Pins 2, 23, 31, 34, 35), VIN (Pins 1, 24), SWx (Pins 26–29), and BOOSTx (Pins 25, 30) terminals optimized for low-inductance power loop layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-phase digital step-down regulator applications.

Compared with LTC3887EUH#PBF and TPS546D24RSAR, the LT7171RV-1#TRPBF uniquely combines integrated dual-phase FETs, Silent Switcher® EMI reduction, and 25ns min on-time in a 3.5mm × 4mm package-enabling 20A solutions with minimal layout area and no external shielding.

Availability

LT7171RV-1#TRPBF is available at Aetrix Electronics and suitable for server CPU core power, enterprise SSD power rails, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LT7171RV-1#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets since 1965.

The LT7171RV-1#TRPBF belongs to Analog Devices' Power by Linear™ family of digitally managed DC/DC regulators, engineered specifically for high-density, low-EMI power delivery in data center, networking, and industrial systems demanding reliability and telemetry.

FAQ

What is the maximum continuous output current supported by the LT7171RV-1#TRPBF?

The LT7171RV-1#TRPBF delivers up to 20A of continuous output current using its dual-phase architecture, with each phase rated for 10A. This is achieved through interleaved switching that reduces RMS input/output ripple and thermal stress. The actual achievable current depends on layout, airflow, and input/output voltage conditions - for example, at 12V_IN/1.0V_OUT, efficiency exceeds 90% at full load per the typical performance curves in the datasheet. The LT7171RV-1#TRPBF must be thermally anchored to a 4-layer PCB with adequate copper pour and thermal vias to sustain 20A continuously.

Does the LT7171RV-1#TRPBF support differential remote voltage sensing?

Yes, the LT7171RV-1#TRPBF supports true differential remote sensing via dedicated VSENSEP (Pin 21) and VSENSEN (Pin 22) inputs. These pins measure voltage directly at the load, rejecting IR drop across PCB traces and connectors. The sensing range is −0.3V to +0.3V relative to VSENSEN, enabling accurate regulation even with >100mΩ path resistance. This feature ensures ±0.25% VOUT accuracy at the point-of-load - a critical requirement for modern FPGA and ASIC supplies where local regulation errors directly impact timing margins and reliability.

How many times can the on-chip NVM of the LT7171RV-1#TRPBF be programmed?

The LT7171RV-1#TRPBF integrates three-times programmable nonvolatile memory (NVM) for storing configuration parameters such as VOUT setpoint, switching frequency, phase offset, loop compensation, and sequencing commands. Each STORE_USER_ALL command consumes one write cycle, and the NVM retains data for ≥10 years under specified bias conditions (T_J = −40°C to +125°C, V_IN = 9.6V–16V). After three writes, further programming attempts are blocked - this is a hardware-enforced limit to ensure data integrity. The LT7171RV-1#TRPBF does not support field reprogramming beyond this count.

What is the minimum on-time specification for the LT7171RV-1#TRPBF and why does it matter?

The LT7171RV-1#TRPBF has a typical minimum on-time of 25ns, which is critical for achieving high switching frequencies (up to 4MHz) while regulating very low output voltages - for instance, generating 0.8V from a 12V input at 2MHz. A short min on-time prevents pulse-skipping and maintains continuous conduction mode (CCM), ensuring predictable loop dynamics and fast transient response. This parameter directly enables compact solution size: shorter on-time allows smaller inductors and output capacitors without sacrificing stability or regulation accuracy in the LT7171RV-1#TRPBF design.

Can the LT7171RV-1#TRPBF operate with an input voltage below 2.9V?

Yes, the LT7171RV-1#TRPBF supports input voltages as low as 1.5V when the EXTVCC pin (Pin 20) is supplied with 3.0V–5.5V - a feature essential for intermediate bus architectures like 3.3V-to-1.2V conversion. Without EXTVCC, the minimum VIN is 2.9V. The EXTVCC-supplied mode reduces quiescent current to 4mA in shutdown and enables full functionality including telemetry and PMBus communication. This dual-input capability makes the LT7171RV-1#TRPBF suitable for both primary and secondary regulation stages in multistage power systems.