Analog Devices LTC7817 | Demoboard DC3033A

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

• Datenblatt
• Produktseite des IC-Herstellers