A high-performance buck-boost switching regulator converter is the LTC3780 DC-DC Step-up Module. Three potentiometers are built within the module to control the settings for voltage and current. It can have a maximum 400 kHz phase-locked frequency due to its constant frequency current construction. The module also includes an FCB pin for switching between Boost, or stepping up, and Buck, or stepping down, operation modes.

LTC3780 Module

The LTC3780 has a wide operating voltage input range and effectively powers loads up to 80 Watts at 10mA. The module has an inherent integrated fault protection circuitry to guard against damage in the case of a malfunction. Both industrial level power systems and pocket gadgets can use the LTC3780.

LTC3780 Components

The module consists of the following components:

Potentiometers: The module is provided with three potentiometers for Under Voltage regulation, Constant Current regulation, and Output Voltage Regulation to set the measurements according to the requirement.

Ready LED: It displays the power indication.

Input Fuse: The module is integrated with an input fuse to protect the circuitry to avoid damage. It can be replaced as well.

Fault LED: The LED will light up under faulty conditions.

LTC3780 IC: The integrated circuit does the stepping up or down of the voltage.

LTC3780 Pinout

The following diagram shows the pinout of the LTC3780 DC-DC Step-up module:

Features and Specifications

  • Operating Voltage: 4 – 36 Volts
  • Synchronous Rectification Efficiency: <98%
  • Output Voltage Accuracy: 0.8<VOUT<30V ±1%
  • Maximum Output Current: 10A
  • Phase-locked frequency Range: 200 kHz – 400 kHz
  • Output Power: 80 Watts
  • Peak Output Power: 130 Watts
  • Package-Type: 24-Lead SSOP and 32-Lead QFN package

Useful Features

The additional features of the LTC3780 DC-DC module are listed as follows:

  • The module has an integrated LDO to supply low-noise voltage for the n-MOSFET
  • The module has four synchronous drive n-channel MOSFETs for functionality.
  • LTC3780 has an output voltage checker to maintain the output voltage within 7.5% of the set mark.
  • It is integrated with Soft-Start that shapes the current by increasing the current limit of the module.
  • LTC3780 has selectable modes for operation.
  • 3 selectable modes for boosting ie. Burst mode for high efficiency, discontinuous, and forced continuous mode to work at constant frequency are provided.
  • 3 selectable modes for bucking ie. Skip-cycle mode for high efficiency, discontinuous, and forced continuous mode to work at constant frequency are provided.
  • To protect the module from over-voltage, a fault protection circuit is embedded in it.

Alternate Options

  • LM2596S DC-DC module
  • XL6009 DC-DC module

LTC3780 Block Diagram

The block diagram of the LTC3780 is provided for repairing purposes. DC-DC Step-up

How to Connect the Input source and get output from LTC3780?

Below is an interface diagram showing the connectors for input and output terminals. To the left two input connector, we can connect an unregulated DC power source ranging from 5-32V. Similar to this, we may obtain regulated DC voltage from the right terminal in the 1 to 30V range.

The input block of the module is linked to the regulated or unregulated power source that needs to be stepped down or boosted. The DC voltage level and current will be adjusted as needed by the LTC3780 chip and potentiometers. The output block of the module is connected to the load. In this manner, the load circuitry is driven by an adjusted DC voltage and current. Although the module includes a heat sinking, if the power is greater than

LTC3780 Applications

  • Communication Systems
  • Automobiles
  • Power Control Systems
  • High power Industrial Control

2D Diagram

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Aravind S S