LTC3859AMPUHF#TRPBF

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LTC3859AMPUHF#TRPBF Application Field and Working Principle

Introduction

The LTC3859AMPUHF#TRPBF, from Linear Technology, is a low-noise, single-phase synchronous step-down voltage regulator with an internal 5-bit analog-to-digital converter (ADC). It is designed to operate with an input voltage range from 4.75V to 40V with input capacitance values up to 1.2µF. This device provides adjustable output voltage between 0.3V to 6.5V and supports output currents up to 25 amps. It operates in either continuous conduction mode (CCM) or discontinuous conduction mode (DCM), selectable through the Mode pin, with response times close to microsecond levels, making it an ideal choice for power supplies in distributed power systems over a wide range of applications.

Features

• Wide Input Voltage Range Between 4.75V - 40V.
• Maximum Continuous Output Currents up to 25A.
• Adjustable Output Voltage Range: 0.3V to 6.5V.
• Integrated High-Voltage PMOS Switch.
• 3-Bit DAC Pin for Output Voltage Control.
• Synchronous Step-down Operation.
• Selectable Continuous Conduction or Discontinuous Conduction modes.
• Low Output Voltage Ripple.
• Low Output Noise.
• Fast Response Time.
• Internal 5-bit Analog-to-Digital Converter.
• Small Package

Applications

• Distributed Power Systems
• Telecommunication
• Networked Computer Systems
• Industrial Automation
• Medical Instruments
• Portable Electronics

Working Principle

The LTC3859AMPUHF#TRPBF utilizes a high performance, current mode control architecture to regulate the output voltage. It includes an internal 5-bit analog-to-digital converter (ADC) to monitor and control the output voltage. The 5-bit DAC pin along with an external resistive dividert, gives the device the ability to precisely adjust the output voltage in a range of 0.3V to 6.5V. The quad-timer configuration provides frequency foldback for both the current mode control loop and the voltage mode control loop, enabling the device to reduce the operating frequency at light loads and/or under high temperature conditions. This feature eliminates potential troubleshooting and eliminates additional compensation.

The device also features integrated PMOS switch enabling high-efficiencies. The dedicated Pin Mode pin controls the output frequency setpoint of the PWM controller, allowing fast response times and selectable continuous conduction or discontinuous conduction modes (CCM/DCM). To further reduce noise and ripple, the output low-pass filter can be quickly optimized with small ceramic capacitors in the feedback loop.

The LTC3859AMPUHF#TRPBF includes an on-board temperature sense pin that senses the package temperature with a small 2.2-2.4mV/°C voltage gradient. The device can be fault-tolerated and can auto-recover from short-circuit, thermal shutdown, undervoltage lockout (UVLO) and overcurrent protection conditions.

In short, the LTC3859AMPUHF#TRPBF from Linear Technology is a high-efficiency, single-phase synchronous step-down voltage regulator with an internal 5-bit analog-to-digital converter (ADC) to provide adjustable output voltage levels between 0.3V to 6.5V. This device is suitable for distributed power systems, telecommunication, networked computer systems, industrial automation, medical instruments and portable electronics.

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