LT8627SP

RECOMMENDED FOR NEW DESIGNS

18V/16A Step-Down Silent Switcher 3 with Ultralow Noise Reference

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Overview

  • Silent Switcher®3 Architecture
    • Ultralow RMS Noise (10Hz to 100kHz): 4μVRMS
    • Ultralow Spot Noise: 4nV/√Hz at 10kHz
    • Ultralow EMI Emissions on Any PCB
    • Internal Bypass Capacitors Reduce Radiated EMI
  • High Efficiency at High Frequency
  • Ultrafast Transient Response: 1μs
  • Fast Minimum Switch On-Time: 15ns
  • Input Voltage Range: 2.8V to 18V
  • Output Voltage Range: 0V to (PVIN - 0.5V)
  • 16A Maximum Continuous Output Current
  • Precision Reference: ± 0.8% Over Temperature with Remote Sense
  • Supports Dynamic Output Voltage Control
  • PolyPhase® Operation: Up to 12 Phases
  • Forced Continuous Mode Capability
  • Adjustable and Synchronizable: 300kHz to 4MHz
  • Programmable Power Good
  • 24-Lead 4mm × 4mm LQFN Exposed Back Package for Optional Heat Sink Mount

The LT8627SP synchronous step-down regulator features third-generation Silent Switcher technology which is uniquely designed to combine an ultralow noise reference with Silent Switcher architecture in order to achieve both high efficiency and excellent wideband noise performance.

The innovative ultralow noise architecture provides exceptional low frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage.

Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies. The top of the package features exposed die for optional heat sink attachment which can be used to significantly improve thermal performance.

The LT8627SP is ideal for high current, noise sensitive applications which benefit from the high efficiency of a synchronous switching regulator.

Note: The LT8627SP is pin-to-pin compatible with the LT8625SP-1.

Applications

  • RF Power Suppliers: PLLs, VCOs, Mixers, LNAs, PAs
  • High Speed/High Precision ADCs/DACs
  • Low Noise Instrumentation

LT8627SP
18V/16A Step-Down Silent Switcher 3 with Ultralow Noise Reference
LT8627SP Typical Application LT8627SP Performance Graph LT8627SP Performance Graph LT8627SP Performance Graph LT8625SP-1 LQFN 24 Pin Configuration LT8625SP-1 Block Diagram
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Tools & Simulations

LTspice


Models for the following parts are available in LTspice:

  • LT8627SP

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LT8627SP
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Evaluation Kits

eval board
DC3147A

LT8627SP |18V, 16A Synchronous Step-Down Silent Switcher with Low Noise Reference

Product Details

Demonstration circuit 3147A is a 18V, 16A synchronous step-down Silent Switcher® 3 with ultralow noise, high efficiency and power density featuring the LT8627SP. The input voltage range of DC3147A is 2.7V to 18V. The default demo board setting is 1V at 16A maximum DC output current. The LT8627SP is a compact, ultralow noise, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The uniquely designed combination of the ultralow noise reference and the third-generation Silent Switcher architecture enables the LT8627SP to achieve both high efficiency and excellent wideband noise performance. Minimum on-time of 15ns allows high VIN to low VOUT conversion at high frequencies.

ADXBAND16EBZ

16Tx/16Rx Direct X-Band Sampled Phased-Array/RADAR/SATCOM Development Platform

Features and Benefits

ADXBAND16EBZ Digitizing Card
  • Multi-Channel, Wideband System Development Platform Using Apollo (AD9084)
  • Mates With Xilinx VCU118 Evaluation Board (Not Included)
  • 16x RF Receive (Rx) Channels
    • Total 16x 8GSPS to 20GSPS ADC
    • Digital Down Converters (DDCs), Each Including Complex Numerically-Controlled Oscillators (NCOs)
    • Programmable Finite Impulse Response Filters (pFIRs)
    • Complex Finite Impulse Response Filters (CFIRs)
  • 16x RF Transmit (Tx) Channels
    • Total 16x 8GSPS to 28GSPS DAC
    • Digital Up Converters (DUCs), Each Including Complex Numerically-Controlled Oscillators (NCOs)
    • Programmable Finite Impulse Response Filters (pFIRs)
    • Complex Finite Impulse Response Filters (CFIRs)
  • Flexible Rx & Tx RF Front-Ends
    • Rx: Filtering, Amplification, Digital Step Attenuation for Gain Control
    • Tx: Filtering, Amplification
  • Flexible Clock Distribution
    • On-Board Clock Distribution from Single External 400MHz Reference
    • Support for External Converter Clock per AD9084 via solder rework
  • On-Board Power Regulation from Single 12V Power Adapter (Included)
16Tx / 16Rx Calibration Board
  • Mates to ADXBAND16EBZ Digitizing Card & VCU118 PMOD Interface (Cable Included)
  • Provides Both Individual Adjacent Channel Loopback and Combined Channel Loopback Options
  • Combined Tx Channels Out Option
  • Combined Rx Channels In Option
Software Features and Benefits

Easy Control Tools and Platform Interfaces to Simplify Software Framework Developments:

  • IIO Oscilloscope GUI
  • MATLAB Add-Ons & Example Scripts
  • Example HDL Builds including JESD204C Bring-Up
  • Embedded Software Solutions for Linux and Device Drivers
Software Reference Design Examples for ADEF Applications to Reduce Prototyping Time:
  • Multi-Chip Synchronization for Power-Up Phase Determinism
  • System-Level Amplitude/Phase Alignment Using NCOs
  • Low-Latency ADC-to-DAC Loopback Bypassing JESD Interface
  • pFIR Control for Broadband Channel-to-Channel Amplitude/Phase Alignment
  • Fast-Frequency Hopping

Product Details

The ADXBAND16EBZ contains four AD9084 mixed‑signal front‑end devices, including the RF front end, clocking, and power circuitry. The ADXBAND16EBZ serves as a complete system solution targeting common applications such as phased‑array radars, wideband systems, and ground‑based SATCOM. Its primary target application is a 16‑Tx/16‑Rx direct X‑band sampling phased array.

The platform is intended as a testbed for demonstrating multi‑chip synchronization, as well as implementing system‑level calibrations, beamforming algorithms, and other signal‑processing techniques. The system is designed to interface with the VCU118 Evaluation Board from Xilinx®, which features the Virtex® UltraScale+™ XCVU9P FPGA, along with provided reference software, HDL code, and MATLAB system‑level interfaces.

A 16‑Tx/16‑Rx Calibration Board can be used to develop system‑level calibration algorithms, including demonstrations of power‑up phase determinism. The Calibration Board provides improvements in combined‑channel dynamic range, spurious performance, and phase noise, and can be controlled via a MATLAB add‑on when connected to the PMOD interface of the VCU118.

DC3147A
LT8627SP |18V, 16A Synchronous Step-Down Silent Switcher with Low Noise Reference
DC3147A Evaluation Board DC3147A Evaluation Board - Top View DC3147A Evaluation Board - Bottom View
ADXBAND16EBZ
16Tx/16Rx Direct X-Band Sampled Phased-Array/RADAR/SATCOM Development Platform

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