24V Boost Converter from 4.5V to 20V Input

  • Rajkumar Sharma
  • 392 Views
  • moderate
  • Tested
  • SKU: EL129468
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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

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIERPART NO
12CN1,CN22 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
22C1,C90.1uF CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
33C2,C3,C1122uF/25V CERAMIC SMD SIZE 1210MURATA/YAGEODIGIKEY
42C4,C522uF/35V CERAMIC SIZE 1210MURATA/YAGEODIGIKEY
51C6DNPDIGIKEY
61C722KPF/50V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
71C82.2uF/25V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
81C10100uF/35V LOW ESR ELECTROLYTICWURTHDIGIKEY732-8942-1-ND
91D1MBRS360ON SEMIDIGIKEYMBRS360BT3GOSTR-ND
101D2LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
111L110uH/7AMP 12X12MMPULSEDIGIKEY553-3679-1-ND
121Q1IRLR7843 DPKINFINEONDIGIKEY448-IRLR7843TRLPBFTR-ND
131R1375K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
141R21M 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
151R310M 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
161R43.3K 5% SMD SIZE 1206MURATA/YAGEODIGIKEY
171R513K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
181R6100K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
191R7430K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
201R85.1E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
211R9150K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
221R1024K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
231R110.004E 1% SMD SIZE 2512YAGEODIGIKEYYAG2139CT-ND
241U1LT8357ANALOG DEVICESDIGIKEY505-LT8357HMSE#PBF-ND
Note:C11use a 47uF/25V Electrolytic THTfor better performance

Connections

Gerber View

Photos

Video

LT8357 Datasheet

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