LTC7818
Info : RECOMMENDED FOR NEW DESIGNS
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LTC7818

40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 16
1ku List Price Starting From $4.65
Features
  • Dual Buck Plus Single Boost Synchronous Controllers
  • Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On)
  • Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage
  • Wide Bias Input Voltage Range: 4.5V to 40V
  • Buck and Boost Output Voltages up to 40V
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • PassThru/100% Duty Cycle Capable for Synchronous Boost MOSFET
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode Operation at Light Loads
  • Boost Channel Current Monitor Output
  • Low Shutdown IQ: 1.5μA
  • Small 40-Lead 6mm × 6mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC7818 is a high performance triple output (buck/buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Its constant-frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7818 operates from a wide 4.5V to 40V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7818 can operate from an input supply as low as 1V after start-up.

The LTC7818 synchronous boost PassThru capability minimizes losses in automotive start-stop applications. The very low no-load quiescent current extends operating run time in battery powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7818 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator.

The LTC7818 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

APPLICATIONS

  • Automotive and Transportation
  • Industrial
  • Military/Avionics
Part Models 16
1ku List Price Starting From $4.65

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Sep 26, 2023

- 23_0121

LTC7817/LTC7818 Die Revision

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Sep 21, 2022

- 22_0220

Change of Moisture Sensitivity Level Rating from MSL 3 to MSL 1 for LTC7818 LFCSP #W Devices

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Sep 26, 2023

- 23_0121

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LTC7817/LTC7818 Die Revision

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PRODUCTION

Sep 21, 2022

- 22_0220

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Change of Moisture Sensitivity Level Rating from MSL 3 to MSL 1 for LTC7818 LFCSP #W Devices

LTC7818EUJ#WPBF

PRODUCTION

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PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2855A

LTC7818 Demo Board | Triple Output Synchronous Step-Up/Dual Step-Down Supply

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DC2855A

LTC7818 Demo Board | Triple Output Synchronous Step-Up/Dual Step-Down Supply

LTC7818 Demo Board | Triple Output Synchronous Step-Up/Dual Step-Down Supply

Product Detail

Demonstration circuit DC2855A is a triple output synchronous step-up/dual step-down supply featuring the LTC 7818. The demonstration circuit is designed for two buck outputs 5V/10A, 3.3V/10A supplied by a boosted 10V output. Benefiting from this feature, the buck outputs are able to maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout whereas the main buck circuit components fit in an area of ¾” by 1½”, while the main boost circuit area is ¾” by 1¾”. The package style for the LTC7818 is a 40-pin exposed pad QFN.

The main features of the board include rail tracking (Buck channels only), an internal 5V linear regulator for bias, separated RUN pins for each output, a PGOOD signal (CH1 only), an overvoltage indicator for CH3 and a Mode selector that allow the converter to run in CCM, Pulseskipping or Burst Mode operation. Spread Spectrum Mode is availiable for EMI improvement. Synchronization to an external clock is also possible. The LTC7818 datasheet gives a complete description of these parts, operation and application information. The datasheet must be read in conjunction with this quick start guide for demo circuit 2855A.

Tools & Simulations

Tools & Simulations 2

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.

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