LTC7878
Info : RECOMMENDED FOR NEW DESIGNS
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LTC7878

70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $3.60
Features
  • Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT
  • Synchronous Rectification: Up to 98% Efficiency
  • Wide VIN Voltage Range: 5V to 70V
  • ±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70V
  • DCR or RSENSE Current Sensing
  • Peak Current Mode Control in Buck/Boost/Buck-Boost Mode
  • Programmable Input or Output Current Regulation
  • 7V NMOS Gate Drivers
  • Phase-Lockable Frequency (100kHz to 600kHz)
  • Multiphase/Multi-ICs Parallel Operation
  • Selectable Continuous or Pulse-Skipping Mode Operation and Inductor Peak Current Limits
  • Small 32-Lead 5mm × 5mm QFN Package
Additional Details
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The LTC7878 is a high performance buck-boost switching regulator controller that operates from an input voltage above, below or equal to the output voltage. The constant-frequency, peak current mode architecture allows a phase-lockable switching frequency of up to 600kHz, while a programmable input or output current loop regulates the average input or output current accurately supporting battery charging applications. With a wide 5V to 70V input and output range and seamless, low noise transitions between operating regions, the LTC7878 is ideal for industrial and telecom systems.

The LTC7878 features forced continuous mode (FCM)/pulse-skipping mode operation. It supports multiphase/multi-ICs parallel operation for high power applications. Additional features include 7V N-Channel gate drivers, smart EXTVCC auxiliary supply and programmable inductor peak current limit. A PGOOD pin indicates when the output is within 10% of its designed set point.

The LTC7878 is available in a low profile 32-Lead QFN package.

APPLICATIONS

  • Industrial and Telecom Systems
  • Distributed DC Power or Battery Systems
Part Models 2
1ku List Price Starting From $3.60

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC7878AUH#PBF
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  • HTML
LTC7878AUH#TRPBF
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  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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EVAL-LTC7878-AZ

70V Parallel Dual Phase 4-Switch Buck-Boost Controller

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EVAL-LTC7878-AZ

70V Parallel Dual Phase 4-Switch Buck-Boost Controller

70V Parallel Dual Phase 4-Switch Buck-Boost Controller

Product Detail

Evaluation circuit EVAL-LTC7878-AZ features the LTC®7878: a 70V parallelable buck-boost controller with inductor DCR current sensing. The LTC7878 is a four-switch buck-boost switching regulator designed to operate above, below, or equal to the output voltage safely and easily. The constant-frequency, peak-current mode architecture allows phase-lockable switching frequency up to 600kHz. A programmable input or output current loop regulates the average input or output current loop, making it suitable for battery charging applications. Additionally, with a wide 5V to 70V input and output range and seamless, low-noise transition between operating regions, the LTC7878 is ideal for industrial and telecom systems.

The EVAL-LTC7878-AZ operates from a 18V to 65V input voltage range and generates an output of 24V and at least a 20A load. The board features two LTC7878’s in parallel to achieve very high power. The parallel operation is set to a switching frequency of 100kHz, which results in an efficient circuit. Both phases are set 180° offset to interleave the switching while still providing great current sharing.

The LTC7878 has a precision voltage reference that can generate an output voltage with a 1% tolerance over the full operating conditions. The converter achieves over 98% efficiency with a 20A load at full operating VIN.

This board can be easily modified to regulate output voltages from 1V to 70V. Its multiphase/multi-ICs parallel operation feature allows for simple alterations for higher power.

The EVAL-LTC7878-AZ provides a high-performance, cost-effective solution for generating a 24V output. The LTC7878 data sheet gives a complete description of this part, its operation, and applications information. The data sheet must be read in conjunction with this user guide for EVAL-LTC7878-AZ. Design files for this circuit board are available at www.analog.com.

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DC2931A

LTC7878 | High Efficiency Buck-Boost Converter

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DC2931A

LTC7878 | High Efficiency Buck-Boost Converter

LTC7878 | High Efficiency Buck-Boost Converter

Product Detail

Demonstration circuit 2931A is a buck-boost regulator featuring the LTC7878. The DC2931A operates from a 9V to 55V input voltage range and generates a 12V, 6A output. The LTC7878 has a precision voltage reference that can generate an output voltage with 1% tolerance over the full operating conditions. The 260kHz switching frequency operation results in a small and efficient circuit. The converter achieves over 97% efficiency with 6A load. The demonstration circuit can be easily modified to regulate output voltages from 1V to 70V.

The DC2931A provides a high-performance, cost-effective solution for generating a 12V output. The LTC7878 data sheet gives a complete description of this part, its operation, and application information. Refer to it in conjunction with the demo manual.

Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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