Analog Devices LT8640A | Demoboard DC3099A

Description

Demonstration circuit 3099A is a 42V, 5A synchronous step-down Silent Switcher® with spread spectrum frequency modulation featuring the LT8640A. The demo board is designed for 5V output from a 5.7V to 42V input. Meanwhile the LT8640A can operate down to 3.4V inputs. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8640A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. The integrated power switches and inclusion of all necessary circuitry reduce the components count and solution size. Special Silent Switcher architecture minimizes EMI emissions. Selectable spread spectrum mode can further improve EMI performance. Ultralow 2.5μA quiescent current in Burst Mode® operation achieves high efficiency at very light loads. Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.The LT8640A switching frequency can be programmed either via oscillator resistor or external clock over a 200kHz to 3MHz range. The default frequency of demo circuit 3099A is 2MHz. The LT8640A SYNC/MODE pin on the demo board is grounded (JP1 at BURST position) by default for low ripple Burst Mode operation. Spread spectrum mode and forced continuous mode can be selected respectively by moving JP1 shunt. To synchronize to an external clock, move JP1 to FCM/SYNC and apply the external clock to the SYNC terminal.The LT8640A data sheet gives a complete description of the part, operation, and application information. The data sheet must be read in conjunction with this demo manual for demo circuit 3099A. The LT8640A is assembled in a 3mm × 4mm plastic QFN package with exposed pad for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout and Thermal Considerations and Peak Output Current.

Features

• Silent Switcher® Architecture
• Ultralow EMI Emissions
• Spread Spectrum Frequency Modulation
• High Efficiency at High Frequency
• Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT
• Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
• Wide Input Voltage Range: 3.4V to 42V
• 5A Maximum Continuous, 8A Peak Transient Output
• Ultralow Quiescent Current Burst Mode® Operation
• 2.5μA IQ Regulating 12VIN to 3.3VOUT
• Output Ripple < 10mVP-P
• Fast Minimum Switch On-Time: 30ns
• Low Dropout Under All Conditions: 100mV at 1A
• Available in Fixed 3.3V Output
• Forced Continuous Mode
• Safely Tolerates High Reverse Current
• Adjustable and Synchronizable: 200kHz to 3MHz
• Peak Current Mode Operation
• Output Soft-Start and Tracking
• Small 18-Lead 3mm × 4mm Side Solderable QFN with Improved Solder Joint Reliability
• AEC-Q100 Qualified for Automotive Applications

Typical applications

• Automotive Supplies
• Industrial Supplies

More information

• Datasheet
• IC product information