LT7184S

RECOMMENDED FOR NEW DESIGNS

Dual Channel 9A, 16V PolyPhase Step-Down Silent Switcher 2 with Digital Power System Management

Data Sheet (Rev. 0) Product Selection Table
Part Models
2
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Part Details

  • Silent Switcher® 2 Architecture: Enables Compact, Efficient, Low EMI Solution
  • PMBus/I2C Serial Interface
    • Telemetry Read Back Includes: VOUT, IOUT, VIN, Die Temperature, Faults 
    • Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, UV/OV, Phase, Frequency (up to 4MHz), Loop Compensation
    • Integrated EEPROM with Fault Event Log
  • Set Key Parameters with Configuration Resistors for Operation without Programming
  • ±0.25% Output Voltage Accuracy over Temperature from 0.6V to 1.375V
  • PolyPhase® Load Sharing for up to Eight Phases
  • Wide VIN Range: Down to 2.9V, or 1.5V with EXTVCC up to 16V
  • Over 94% Peak Efficiency at 1MHz, 12VIN to 3.3VOUT
  • VOUT Range: 0.4V to 5.5V (up to 85% x VIN);
  • Differential Remote VOUT Sense
  • External Frequency Synchronization
  • 36-Lead (4mm x 5mm) LQFN Package
LT7184S
Dual Channel 9A, 16V PolyPhase Step-Down Silent Switcher 2 with Digital Power System Management
LT7184S Typical Application Circuit LT7184S Typical Application LT7184S Pin Configuration
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Documentation

Data Sheet 1

User Guide 2

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Evaluation Kits

EVAL-LT7184S-AZ

Dual Channel 9A, 16V, PolyPhase Step-Down Silent Switcher 2 with Digital Power System Management

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Product Details

The EVAL-LT7184S-AZ evaluation board is a dual-output PolyPhase® monolithic DC/DC synchronous step-down regulator with a 2.9V or 1.5V with EXTVCC to 16V input range featuring LT®7184S. Each output can supply -8A to +9A continuous current and simultaneously deliver up to 7A of continuous current from both channels. The second-generation Silent Switcher® regulator structure is incorporated into the LT7184S to minimize EMI and reduce Printed circuit board (PCB) layout sensitivity. It also integrates digital power system management functions, allowing for programmability and telemetry with a PMBus/I2C-compliant serial interface. Refer to the LT®7184S datasheet for more detailed information.

The EVAL-LT7184S-AZ evaluation board is designed for 1.2V output0 and 3.3V output1 with a switching frequency set at 1MHz. The controlled on-time valley current-mode control with 25ns typical minimum on-time enables a high switching frequency at a low output voltage with excellent transient response in a small overall solution size.

The evaluation board has Electromagnetic interference (EMI) filters installed for both channels. The EMI performances of the board are shown in Figure 5. The red lines in Figure 5 are the CISPR25 CLASS 5 limit.

The EVAL-LT7184S-AZ powers up to default settings and produces power based on the configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the power system management features of the part, download the Graphic user interface (GUI) software LTpowerPlay® onto the PC and use Analog Devices’ I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in Electrically erasable programmable read-only memory (EEPROM), viewing telemetry of voltage, current, temperature, and fault status.

Graphic User Interface (GUI) Download

The software can be downloaded from LTpowerPlay.

The LT7184S datasheet gives a complete description of the part, operation, and application information. The data sheet must be read in conjunction with this demo manual for EVAL-LT7184S-AZ.

For more details and instructions on the LTpowerPlay, see the LTpowerPlay Software GUI section for the LT7184S Quick Start Guide.
EVAL-LT7184S-AZ
Dual Channel 9A, 16V, PolyPhase Step-Down Silent Switcher 2 with Digital Power System Management

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