Analog Devices Inc. DC2846A Demonstration Circuit for LTC7804
Analog Devices DC2846A Demonstration Circuit is a DC/DC synchronous boost converter featuring the LTC7804 (MSE package), a spread spectrum, or constant frequency current mode synchronous boost controller. The DC2846A generates a 24V output voltage and provides up to 6A of output current. The 500kHz constant switching frequency operation results in a small and efficient circuit. The converter provides high output voltage accuracy (typically ±2%) over a wide load range with no minimum load requirement.
The DC2846A supports two ways of biasing step-up controllers: directly from the input voltage or output rail. The third possibility is connecting the voltage source to the EXTVCC terminal. DC2846A features an extremely wide switching frequency range from 100kHz to 3MHz. It can be synchronized to the external clock anywhere inside this range. Spread spectrum operation reduces the peak radiated and conducted noise and simplifies compliance with electromagnetic interference (EMI) standards.
The Analog Devices DC2846A has a small circuit footprint. It is a high-performance and cost-effective solution for telecom, automotive, and Power-over-Ethernet applications.
Features
- Wide 6V to 32V input voltage range
- Relatively high output power, up to 150W
- Extremely low quiescent current, 15μA at sleep mode and as low as 1μA at shutdown
- Onboard low power bias supply
- Pulse-skipping mode, forced continuous operation, or low ripple Burst Mode® operation at light loads
- Onboard low power bias supply
- Ability to select spread-spectrum or fixed-frequency
- Synchronization with an external clock
- If VIN > VO, the DC2846A eliminates the usual boost topology losses by keeping the top MOSFET on continuously
Applications
- Telecom
- Automotive
- Power-over-Ethernet (PoE)
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Related Product
Analog Devices Inc. LTC7804 Low IQ Synchronous Boost Controller
Synchronous boost DC/DC switching regulator controller that drives an N-channel power MOSFET stage.