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

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 5V_DC. 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 I_ADJ 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

LT1618 Block Diagram

Gerber View

Photos

Video

LT1618 Datasheet

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