IC-Hersteller Analog Devices

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Analog Devices LTC7817 | Demoboard DC3033A

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

Details

TopologieAbwärtswandler
Eingangsspannung4.5-36 V
Ausgang 13.3 V / 10 A
Ausgang 210 V / 10 A
Ausgang 35 V / 10 A

Beschreibung

Demonstration circuit 3033A is a triple output synchronous step-up/dual step-down supply featuring the LTC7817. 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-inch by 1½-inch, while the main boost circuit area is ¾-inch by 1¾-inch. The package style for the LTC7817 is a 38-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), and a mode selector that allow the converter to run in forced continuous mode (FCM), pulse-skipping (PSM) or Burst Mode® operation (BURST). Synchronization to an external clock is also possible. The LTC7817 data sheet gives a complete description of these parts, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 3033A.

Eigenschaften

  • 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
  • Pass-Thru™ Operation: 100% Duty Cycle for Boost Synchronous MOSFET
  • RSENSE or DCR Current Sensing
  • 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
  • Very Low Buck Dropout Operation: 99% Duty Cycle
  • Low Shutdown IQ: 1.5μA
  • Small 38-Lead 5mm × 7mm QFN Package
  • AEC-Q100 Automotive Qualification in Process

Typische Anwendungen

  • Battery fed applications
  • Automotive

Weiterführende Informationen