Analog Devices Ltc3114-1 Signal Chain Power Series Buck-boost Converter Module Instruction Manual

ANALOG DEVICES LTC3114-1 Signal Chain Power Series Buck-Boost Converter Module Instruction Manual

DESCRIPTION

Demonstration circuit SCP-LTC3114-1-EVALZ features the LTC3114-1, a wide operating range, synchronous monolithic buck-boost converter with programmable average output current. The circuit operates with a 2.2V to 40V input voltage range.
Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:

SCP-INPUT-EVALZ
SCP-1X2BKOUT-EVALZ
SCP-OUTPUT-EVALZ
SCP-1X5BKOUT-EVALZ
SCP-FILTER-EVALZ
SCP-5X1-EVALZ
SCP-THRUBRD-EVALZ

To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and topology for your design.

Note that this Demo Manual does not cover details important to the operation and configuration regarding the LTC3114-1. Please refer to the LTC3114-1 datasheet for a complete description of the part.
Design files for this circuit board are available. All registered trademarks and trademarks are property of their respective owners.

Table 1. Performance Summary

BOARD IMAGE

QUICK START PROCEDURE

Demonstration circuit SCP-LTC3114-1-EVALZ is easy to set up to evaluate the performance of any SCP hardware configuration.

1. The SCP-LTC3114-1-BB-EVALZ ships with a default output voltage of 5V. To change the output voltage, see “Configuration Settings” section, and modify the board accordingly. Be sure to check for open connections or solder shorts after making any modifications.
2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUTEVALZ boards to the SCP-LTC3114-1-BB-EVALZ (refer to Figure 2) and connect the input board to a voltage source, VSOURCE. Connect the output board to a voltmeter or dynamic load. Slowly raise the  input voltage until the SCP-LTC3114-1-BB-EVALZ powers up into regulation and sweep VSOURCE through the desired range of operation.
   NOTE: Make sure that the input voltage is always within specification. If using a dynamic load to measure output voltage, make sure the load is initially set to zero.
3. Check for proper output voltage. The output should be regulated at the programmed value (±5%).
4. Once the proper output voltage is established, power off VSOURCE and similarly test other boards in the SCP system until all elements have been individually verified prior to assembling into the final circuit configuration.
   NOTE: When measuring the input or output voltage ripple, use the optional SMA connector locations available on the input, output, 1 ´ 5, 1 ´ 2, and 5 ´ 1 breakout boards. Avoid using the test point connections with long scope leads.
   

CONFIGURATION SETTINGS
Demonstration circuit SCP-LTC3114-1-EVALZ features the LTC3114-1, a wide operating range, synchronous monolithic buck-boost converter with programmable average output current. The circuit operates with a 2.2V to 40V input voltage range.

The output of the SCP-LTC3114-1-EVALZ is resistor-programmable from 3.0V to 40V. The board can be also configured to drive VIOC capable linear regulators.

OUTPUT VOLTAGE PROGRAMMING

Table 2. Resistor Selection Guide for Common Output Voltages

Note 1. Output capacitor rating limited. Replace for higher VOUT.

RUN PIN CONFIGURATION
The RUN pin is tied to the optional SCP Run/Sequence header P1. To create a harness for this function, use Molex part 0510650300 with crimp pin 50212-8000.
To use an active run signal, use a 1.00MW for either pullup or pull-down resistors R5 and R6, short R9 with 0W, and use the drive signal from connector P1.

VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC) IMPLEMENTATION
To implement the VIOC function for this regulator, set R12 to 0W. Refer to the “Configuration Settings” section in the Demo Manual for the low-dropout (LDO) linear regulator board and use the following configuration for this board.

Table 3. VIOC Cross-Reference Designators

ISINK is the current through RMAX, typically 15µA, so RBOT should be sized such that the divider current runs a minimum of 100µA to minimize the ISINK error term.

PARTS LIST

SCHEMATIC DIAGRAM

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

ESD Caution
ESD (electrostatic discharge) sensitive device.
Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality

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References

• Mixed-signal and digital signal processing ICs | Analog Devices
• Mixed-signal and digital signal processing ICs | Analog Devices
• Mixed-signal and digital signal processing ICs | Analog Devices
• LTC3114-1 Datasheet and Product Info | Analog Devices