Analog Devices LTC7819 | Demoboard DC2897A

Description

Demonstration circuit 2897A is a low IQ, triple output, synchronous step-down supply featuring the LTC7819. The circuit is optimized for high efficiency. It provides outputs of 3.3V at 12A, 8.5V at 10A and 5.0V at 12A over an input voltage range of 10V to 36V with a switching frequency of 380kHz. Each rail uses a 3mΩ sense resistor to sense the current and provides optional footprints for DCR sensing. Typical applications include automotive, transportation, industrial, military and avionics systems.Features of the DC2897A include pin selectable light load operating modes of forced continuous mode, pulse-skipping and Burst Mode® operation. Optional spread spectrum modulation to reduce EMI, a PLLIN pin to synchronize to an external clock, optional DCR sensing footprints, an EXTVCC pin to reduce losses in the controller and optional footprints to parallel two or three channels.

Features

• Triple Buck Synchronous Controllers
• Wide Input Voltage Range: 4.5V to 40V
• Wide Output Voltage Range: 0.8V to 99% -VIN
• Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On)
• Spread Spectrum Operation
• RSENSE or DCR Current Sensing
• Integrated Bootstrap Supply Charge Pump (Channel 1)
• PassThru™/100% Duty Cycle Capability (Channel 1), 99% Duty Cycle (Channels 2 and 3)
• Programmable Fixed Frequency (100kHz to 3MHz)
• Phase-Lockable Frequency (100kHz to 3MHz)
• Selectable Continuous, Pulse-Skipping, or Low Ripple, Burst Mode® Operation at Light Loads
• Low Shutdown IQ: 1.5μA
• Small 40-Lead 6mm × 6mm QFN Package
• AEC-Q100 Qualified for Automotive Applications

Typical applications

• Automotive and Transportation
• Military / Avionics
• Industrial

More information

• Datasheet
• IC product information