Analog Devices LTC7811 | Demoboard DC3151A

Beschreibung

Demonstration circuit DC3151A is a non-synchronous boost plus dual synchronous buck power supply featuring the LTC7811. The demonstration circuit is designed for two buck outputs 5V/10A, 3.3V/7A supplied by a boosted 9.5V output. Benefiting from this feature, the buck outputs can 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 LTC7811 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, separate RUN pins for each output, a PGOOD signal (CH1 only), battery monitor and a Mode selector that allow the converter to run in CCM, Pulse-skipping or Burst Mode operation. Spread Spectrum Mode is available for EMI improvement. Synchronization to an external clock is also possible.The LTC7811 datasheet gives a complete description of this part, its operation and application information. The datasheet must be read in conjunction with the quick start guide for demo circuit 3151.

Eigenschaften

• Dual Synchronous Buck Plus Single Boost 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 Output Voltages Up to 40V
• Boost Output Voltage Limited Only by External Components
• Spread Spectrum Operation
• RSENSE or DCR Current Sensing
• Low Battery Indicator for Automotive Applications
• 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
• Boost Channel Current Monitor Output
• Low Shutdown IQ: 1.5μA
• Small 40-Lead 6mm × 6mm QFN Package
• AEC-Q100 Qualified for Automotive Applications

Typische Anwendungen

• Military/Avionics
• Automotive and Transportation
• Industrial

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers