Analog Devices LTC3894 | Demoboard DC2506A

Description

Demonstration circuit 2506A is a high voltage, currentmode DC/DC step-down converter featuring the LTC3894.The board operates from an input range of 6V to 150V, and provides a 5V, 3A output. The PMOSFET architecture allows it to operate seamlessly up to 100% duty cycle, and function as a saturated switch below the regulationthreshold. This application has undervoltage lockout programmed for a 6V minimum input to assure adequate gate drive for the MOSFET. It operates at 150kHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. Burst Mode opera- tion that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided.This board is suitable for a wide range of automotive, telecom, industrial, and other applications. The LTC3894 is available in a thermally enhanced 20-pin TSSOP package with skipped leads to accommodate high voltage creepage and clearance requirements. For other output requirements, see the LTC3894 data sheet or contact the LTC factory.

Features

• Wide Operating VIN Range: 4.5V to 150V
• Wide VOUT Range: 0.8V to 60V
• 9μA IQ when Regulating 48VIN to 3.3VOUT
• 16μA IQ when Regulating 12VIN to 3.3VOUT
• Very Low Dropout Operation: 100% Duty Cycle
• Adjustable Input Overvoltage Lockout
• Programmable PGOOD Undervoltage Monitor
• RSENSE or Inductor DCR Current Sensing
• Selectable High Efficiency Burst Mode® Operation or Pulse-Skipping Mode at Light Loads
• Programmable Fixed Frequency: 50kHz to 850kHz
• Phase-Lockable Frequency: 75kHz to 800kHz
• Internal Fixed Soft-Start and External Programmable Soft-Start or Voltage Tracking
• Strong MOSFET Gate Driver with Selectable Undervoltage Lockout Thresholds
• Optional External NMOS for Gate Driver Bias in High Power Applications

Typical applications

• Telecommunication Power Systems
• Automotive and Industrial Power Systems
• Distributed Power Systems

More information

• Datasheet
• IC product information