LT80603

PRE-RELEASE

3V to 65V, 2.5A/3.5A/4.5A Synchronous Step-Down Silent Switcher with 8μA Quiescent Current

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Silent Switcher® Architecture
    • Ultralow EMI Emissions
    • Spread Spectrum Frequency Modulation
  • High Efficiency at High Frequency
    • Up to 94.3% at 400kHz, 90% at 2.1MHz, 24VIN to 5VOUT
    • Up to 95.6% at 400kHz, 91.1% at 2.1MHz, 48VIN to 12VOUT
  • Pin Selectable Fixed 3.3V, Fixed 5V, or Adjustable Output from 0.8V to 99% of VIN
  • Low Quiescent Current Burst Mode Operation
    • 8μA IQ Regulating 24VIN to 5VOUT
  • On-the-Fly Mode Change Among Burst Mode, Pulse-Skipping Mode, and FCM
  • Built-in Output-Voltage Monitoring and Die Temperature Monitoring with PG/TJ
  • 200kHz to 3MHz Adjustable Switching Frequency with External Clock Synchronization
  • 80V Transient-Input Tolerant (LT8060xHV)
  • Programmable Soft-Start and Tracking
  • Small 17-Lead 3mm × 3mm Quad Flat No-lead (QFN)

The LT8060x and LT8060xHV step-down regulators family feature the Silent Switcher® architecture to minimize electromagnetic interference (EMI) emissions while delivering high efficiency at frequencies up to 3MHz. The LT80602 and LT80602HV deliver up to 2.5A continuous current, the LT80603 and LT80603HV support up to 3.5A, and the LT80603A and LT80603AHV provide up to 4.5A continuous current. An ultralow 8μA quiescent current, with the output in full regulation, enables applications requiring the highest efficiency at light loads. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin to program the switch frequency.

The LT8060x and LT8060xHV enable high-VIN to low-VOUT conversion at high frequency, featuring a productiontested fast minimum top-switch on-time of 25ns (typ). In addition, the device features a PG/TJ pin that can be used to monitor the status of the output voltage or the die temperature. The die temperature monitor allows for direct measurement of the silicon die temperature, enabling a robust and reliable power supply design.

APPLICATIONS

  • General Purpose Step-Down
  • Automotive and Industrial Supplies
LT80603
3V to 65V, 2.5A/3.5A/4.5A Synchronous Step-Down Silent Switcher with 8μA Quiescent Current
LT80602-LT80603 Simplified Application Diagram LT80602-LT80603 Efficiency LT80602-LT80603 Pin Configuration LT80603 Chip Illustration
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Documentation

Data Sheet 1

User Guide 1

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Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
LT80603EVKIT

Evaluates: LT80603, LT80602 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 92.6% Efficiency (VIN = 24V, IOUT = 3.5A)
  • 8μA IQ Regulating 24VIN to 5VOUT
  • On-the-Fly Mode Change Among Burst Mode, Pulse-Skipping Mode (PSM), and Forced Continuous Mode (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 Die Temperature Monitoring with PG/TJ
  • Overtemperature and Overcurrent Protection
  • External Clock Synchronization
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Complies with CISPR 25 Class 5 Conducted and Radiated Emissions

Product Details

The LT80603EVKIT# (EV kit) is a proven 5V design to evaluate the LT80603 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 LT80603 is a compact, ultralow electromagnetic interference (EMI) emission, high-efficiency, high-speed synchronous monolithic step-down switching regulator that consumes only 8μA of quiescent current when the output is regulated at 5V. The top and bottom power switches, compensation components, and other necessary circuits within the LT80603 minimize the need for external components and simplify the design. The EV kit can also evaluate the LT80602, LT80603A, LT80603HV, LT80602HV, and LT80603AHV. Refer to the IC datasheet guidelines when modifying the schematic to achieve optimal performance.

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

The LT80603 data sheet provides a complete description of the part, its operation, and application information. Consult the data sheet in conjunction with this EV kit.

Design files for this circuit board are available at https://www.analog.com/en/products/LT80603.html.
LT80603EVKIT
Evaluates: LT80603, LT80602 in 5V Output-Voltage Application
LT80603-EVKIT Evaluation Board Angle View LT80603-EVKIT Evaluation Board Top View LT80603-EVKIT Evaluation Board Bottom View

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