LT3697

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USB 5V, 2.5A Output, 35V Input Buck with Cable Drop Compensation

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Overview

  • Accurate 5V Output
  • Programmable Cable Drop Compensation
  • Programmable Output Current Limit
  • Adjustable Output from 5.0V to 6.1V
  • Dual Input Feedback Permits Regulation on Output of USB Switch
  • Active Load Reduces Output Overshoot
  • FLT Flag Indicates Overcurrent on the USB Output
  • 1.5ms FLT Flag Delay Filters Hot Plug Events
  • USB Output Current Monitor
  • Wide Input Rage: Operation from 5V to 35V
  • Withstands Input Transient to 60V
  • 2.5A Maximum Output Current
  • Survives Output Short to GND and Car Battery
  • Adjustable Switching Frequency: 300kHz to 2.2MHz
  • Synchronizable from 300kHz to 2.2MHz
  • Small, Thermally Enhanced 16-Lead MSOP Package

The LT3697 is a 35V, 2.5A step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. The accurate, programmable current limit can eliminate the need for a USB power switch and improve system reliability. The provided 180mA active load reduces output overshoot during load transients. Dual feedback allows regulation on the output of a USB switch and limits cable drop compensation to a maximum of 6.1V output, protecting USB devices during fault conditions. A separate 5V output can be taken from the SYS terminal to power auxiliary circuitry such as a USB hub controller. The LT3697 also provides a load current monitor output and an overcurrent fault indicator.

The LT3697 operates from 300kHz to 2.2MHz and withstands input voltage transients up to 60V. The device's output survives shorts to ground and to the battery. A current mode topology is used for fast transient response and good loop stability. Shutdown reduces input supply current to less than 1μA. The LT3697 is available in a 16-lead MSOP package with an exposed pad for low thermal resistance.

Applications

  • Automotive USB
  • Industrial USB
LT3697
USB 5V, 2.5A Output, 35V Input Buck with Cable Drop Compensation
5V Step-Down Converter with Cable Drop Compensation and Output Current Limit Transient Response Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 1
LTC4362-1
LTC4362-2
1.2A Overvoltage/Overcurrent Protector
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3697
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
schematic 1
DC1893A

LT3697EMSE Demo Board | 8V ≤ VIN ≤ 35V; VOUT = 5V at 2.4A

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Product Details

Demonstration circuit 1893A is a USB 5V, 2.4A output, 35V input buck with cable drop compensation featuring the LT3697. The LT3697 is a step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket at the end of a long cable. The circuit was designed to run at 500kHz to avoid the AM band. The demo board has an EMI filter installed. The radiated EMI performance of the board is on Figures 3 to 5, showing the circuit passes CISPR25 Class 5 with a wide margin.
DC1893A
LT3697EMSE Demo Board | 8V ≤ VIN ≤ 35V; VOUT = 5V at 2.4A
DC1893A - Schematic

Latest Discussions

2 Years Ago
What are the variations of the LT3697?
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