LT80605

RECOMMENDED FOR NEW DESIGNS

3V to 65V, 5.5A Synchronous Step-Down Silent Switcher with 9μA Quiescent Current

Data Sheet (Rev. SpA) Product Selection Table
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Overview

  • Silent Switcher® Architecture, Ultralow EMI Emissions
  • High Efficiency at High Frequency
    • Up to 94.5% at 400kHz, 24VIN to 5VOUT
    • Up to 93% at 1MHz, 24VIN to 5VOUT
  • Pin Selectable Adjustable, Fixed 3.3V and 5V Output
  • Ultralow Quiescent Current Burst Mode Operation
    • 9μA IQ Regulating 24VIN to 5VOUT
  • On-the-Fly Mode Change Among Burst, Pulse Skip and Forced Continuous Mode
  • Burst and Pulse Skipping Modes to Enable Enhanced Light-Load Efficiency
  • Built-in Output-Voltage Monitoring and Die Temperature Monitoring with PG/TJ
  • 99% Duty-Cycle Operation
  • 200kHz to 3MHz Adjustable Switching Frequency with External Clock Synchronization
  • 70V Transient-Input Tolerant
  • Internal Compensation
  • Programmable Soft-Start and Tracking
  • Built-in Hiccup Mode Overload Protection;
  • Safely Tolerates Inductor Saturation in Overload
  • Small 17-Lead 3mm × 4mm QFN

The LT80605 step-down regulator features the Silent Switcher® architecture to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm x 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 9μA quiescent current with the output in full regulation enables applications requiring highest efficiency at light loads. The device features a SYNC/MODE pin that selects among Burst Mode, pulse skipping, or forced continuous mode (FCM), and also allows synchronization to an external clock. Soft-start and tracking functionality are accessed through the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency. In addition, the device features a PG/TJ pin that can be used either to monitor the status of output voltage or die temperature. The die temperature monitor allows to directly measure the silicon die temperature, enabling a robust, reliable power supply design.

APPLICATIONS

  • General Purpose Step-Down
  • Automotive and Industrial Supplies
LT80605
3V to 65V, 5.5A Synchronous Step-Down Silent Switcher with 9μA Quiescent Current
LT80605 Typical Application LT80605 Typical Application Efficiency LT80605 Chip Illustration
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Documentation

Data Sheet 1

User Guide 1

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Evaluation Kits

eval board
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schematic 3
EVAL-LT80605

Evaluates: LT80605 in 5V Output-Voltage Application

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Features and Benefits

  • Silent Switcher® Architecture, Ultralow EMI Emissions
  • Input Voltage Range up to 65V
  • 400kHz Switching Frequency
  • High 93% Efficiency (VIN = 24V, IOUT = 5.5A)
  • 9μA IQ Regulating 24VIN to 5VOUT
  • On-the-Fly Mode Change Between Burst, Pulse Skip, and FCM
  • 99% Duty-Cycle Operation
  • 0.75μA Shutdown Current
  • Bias Bootstrap Input for Improved Efficiency
  • Burst and Pulse Skipping Modes to Enable Enhanced Light-Load Efficiency
  • Programmable Soft-Start and Tracking
  • Built-in Output-Voltage Monitoring and DieTemperature Monitoring with PG/TJ
  • Overtemperature and Overcurrent Protection
  • External Clock Synchronization.
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Complies with CISPR 25 Conducted and Radiated Emissions

Product Details

The LT80605EVKIT# (EV kit) is a proven 5V design to evaluate the LT80605 synchronous step-down Silent Switcher®. The EV kit is designed for a 5V output. The wide input range up to 65V allows a variety of input sources, such as automotive batteries and industrial supplies. The LT80605 is a compact, ultralow EMI emission, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 9μA of quiescent current when the output is regulated at 5V. Top and bottom power switches, compensation components, and other necessary circuits inside the LT80605 minimize external components and simplify design.

The application circuit demonstrated in the evaluation board is suitable for a wide range of automotive, telecom, industrial, and other applications.

The LT80605 data sheet gives a complete description of the part, operation, and application information. Consult the data sheet in conjunction with this demo manual. Design files for this circuit board are available at www.analog.com.
EVAL-LT80605
Evaluates: LT80605 in 5V Output-Voltage Application
EVAL-LT80605 Board Photo Angle View EVAL-LT80605 Board Photo Top View EVAL-LT80605 Board Photo Bottom View

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