Analog Devices Inc. LTC3638 Demo Board DC2057A

Analog Devices Inc. LTC3638 Demo Board DC2057A is an evaluation board featuring a high input voltage, 250mA output, DC-DC power supply example circuit based on the LTC3638 Step-Down Regulator. The LTC3638 operates with high-efficiency Burst Mode® operation and includes an internal high side power MOSFET. The LTC3638 Demo Board DC2057A will accept an input voltage between 4V and 140V, and provide jumper selected output voltages of 1.8V, 3.3V, 5V with an option for additional voltages. The LTC3638 IC includes an internal soft-start and a provision for increasing soft-start time.

Included on the LTC3638 Demo Board DC2057A is an ON/OFF jumper that can also be configured as a precision undervoltage lockout. Additional PC pads are included for programming the current limit to optimize efficiency and for reducing output voltage ripple and reducing component size. A terminal (FBO) is included to allow multiple boards to be paralleled for higher output current.

Output voltages between 800mV and VIN can be programmed using optional resistors (higher voltage rating output capacitors may be required).


  • Input Supply Range (VIN): 4V to 140V
  • 1.8V Output: 1.8V ±2%
  • 3.3V Output: 3.3V ±2%
  • 5V Output: 5V ±2%
  • Maximum Output Current (IOUT): 250mA
  • Typical Efficiency (EFF): 83.7%
  • Typical Output Voltage Ripple: 81mVP-P

Test Setup

Mechanical Drawing - Analog Devices Inc. LTC3638 Demo Board DC2057A
Published: 2019-06-28 | Updated: 2022-03-11