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12V Step-Up DC-DC Converter from 1.8V to 5V Input

  • Rajkumar Sharma
  • 64 Views
  • easy
  • Tested
  • SKU: EL145312
  • Quote Now

This is a DC/DC converter that combines a traditional voltage feedback loop and a unique current feedback loop to operate as a constant-current, constant-voltage source. The project has been designed using the LT1618 chip. The board provides 12V/150mA output, from input supply 1.8V to 5VDC. The LT1618 uses a constant frequency, current mode control scheme to provide excellent line and load regulation.

Features

  • Input Supply 1.8V to 5V
  • Output 12V @ 150mA
  • Boost Converter with 500mA Input Current Limit
  • Operating Frequency 1.4Mhz
  • Efficiency up to 80%
  • Header Connector for Input and Output
  • Low Profile, small size PCB
  • PCB Dimensions 18.89 x 14.13mm

The LT1618 step-up DC/DC converter combines a traditional voltage feedback loop and a unique current feedback loop to operate as a constant-current, constant-voltage source. This fixed frequency, current mode switcher operates from a wide input voltage range of 1.6V to 18V, and the high switching frequency of 1.4MHz permits the use of tiny, low-profile inductors and capacitors. The current sense voltage is set at 50mV and can be adjusted using the IADJ pin.

Connections

  • Pin 1 = Input Supply 1.8V To 5V DC
  • Pin 2 = GND
  • Pin 3 = GND
  • Pin 4 = Output 12V DC

Schematic

Parts List

NOQNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11CN14 PIN MALE HEADER PITCH 2.54MMADAM TECHDIGIKEY2057-PH1RB-04-UA-ND
22C1,C34.7uF/16V X7R CERAMIC SMD SIZE 0805SAMSUNGDIGIKEY1276-2970-1-ND
31C210nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
41C42.2uF/16V X7R CERAMIC SMD SIZE 0805TDKDIGIKEY445-1420-1-ND
51D1SS14 FAST DIODEON SEMIDIGIKEYSS14CT-ND
61J1OPEN/SOLDER JUMPER
71L110uHBOURNSDIGIKEYSRR4011-100YLCT-ND
82R1,R20.2E 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
91R32K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
101R4DNP
111R50E SMD SIZE 0805YAGEO/MURATADIGIKEY
121R6909K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R7107K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
141U1LT1618 MSOP 10PINANALOG DEVICESDIGIKEYLT1618EMS#TRPBFCT-ND

LT1618 Block Diagram

Gerber View

Photos

Video

LT1618 Datasheet

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