24V Boost Converter from 4.5V to 20V Input

The project presented here is a boost converter with 24V output from 4.5V to 20V DC Input. The project is built using an LT8357 chip and configured as a boost converter. Under voltage lockout, and soft-start are a few key features of the project. LED D1 indicates the output, and screw terminals are provided for easy output and input connections.

The LT8357 is a wide input range, current mode, and DC/DC controller which can be configured as a boost, SEPIC, or flyback converter. The LT8357 drives a low-side N-channel power MOSFET with a 5V split gate drive. The current mode architecture allows adjustable and synchronizable 100kHz to 2MHz fixed frequency operation, or internal 19% triangle spread spectrum operation for low EMI. At light load, either pulse-skipping mode or low-ripple Burst Mode operation can be selected. Additional features include output power good and output short circuit protection in SEPIC and flyback configurations with a wide 3V to 60V input voltage range and 8μA low quiescent current, the LT8357 provides a simple, compact and efficient solution for automotive, industrial, and battery-powered systems.

Connections

• CN1: Pin 1 = DC Supply Input 4.5V to 20V DC, Pin 2 = GND
• CN2: Pin 1 = +24V DC Output, Pin 2 = GND
• D2: Power LED

Features

• Input Supply Range 4.5V to 20V
• Output 24V DC (Up to 2Amps)
• Operating Frequency 200Khz
• Under Voltage Lockout 4.3V
• Efficiency Up to 90-95%
• Soft Start Feature
• PCB Dimensions 46.04 x 30.80 mm
• Power LED On Output
• 4 x 2.5mm Mounting Holes

Schematic

Parts List

Connections

Gerber View

Photos

Video

LT8357 Datasheet

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