LTC7804 40 V 3 MHz Boost Controller with Spread Spectrum offers 99.9% efficiency

LTC7804 40 V 3 MHz Boost Controller with Spread Spectrum offers 99.9% efficiency

Analog Devices’ LTC7804 offers low Iq, small solution size, and PassThru™ operation for up to 99.9% efficiency

ADI’s LTC7804 is a low IQ, 3 MHz PassThru operation capable of synchronous boost DC/DC switching regulator controller that operates up to a 40 V input voltage. Its low quiescent current extends operating runtime in battery-powered systems when in standby mode. Spread spectrum frequency operation modulation helps reduce radiated and conducted EMI peak, and up to 3 MHz switching reduces the solution size, ideal for a broad range of applications and markets.

As a demonstration circuit, the DC2846A is a DC/DC synchronous boost converter that features the LTC7804 (MSE package), a spread spectrum or constant frequency current mode synchronous boost controller. The DC2846A generates a 24 V output voltage and provides up to 6 A of output current. The 500 kHz constant switching frequency operation results in a small and efficient circuit.

The converter provides high output voltage accuracy (typically ±2%) over a wide load range with no minimum load requirement.

The DC2846A supports two ways of biasing step-up controllers: directly from the input voltage or output rail. The third possibility is connecting a voltage source to the EXTVCC terminal.

The DC2846A has an extremely wide switching frequency range from 100 kHz to 3 MHz. It can be synchronized to the external clock anywhere inside this range. The spread spectrum operation is used for reducing the peak radiated and conducted noise to simplify compliance with electromagnetic interference (EMI) standards.

The DC2846A has a small circuit footprint. It is a high-performance and cost-effective solution for telecom, automotive, and Power over Ethernet (PoE) applications.

DC2846A Features

  • Wide input voltage range: from 6 V to 24 V
  • Relatively high output power: up to 150 W
  • Extremely low quiescent current: 15 µA at sleep mode and as low as 1 µA at shutdown
  • Onboard low power bias supply
  • Ability to select spread spectrum or fixed frequency
  • Pulse-skipping mode: forced continuous operation or low ripple Burst Mode® operation at light loads
  • Synchronization with external clock
  • If VIN > VOUT, the DC2846A eliminates the usual boost topology losses by keeping the top MOSFET on continuously

LTC7804 Features

  • Synchronous operation for reduced power dissipation
  • PassThru operation/100% duty cycle capability for synchronous MOSFET
  • Wide VIN range: 4.5 V to 40 V, operates down to 1 V after start-up
  • Output voltage up to 40 V
  • Low operating IQ: 14 μA
  • Spread spectrum operation
  • Selectable fixed frequency (100 kHz to 3 MHz)
  • AEC-Q100 qualification in progress

Application Circuit

more information: https://www.analog.com/en/products/ltc7804.html

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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