ANALOG DEVICES LTC3114-1 Signal Chain Power Series Buck-Boost Converter Module Instruction Manual
- June 6, 2024
- Analog Devices
Table of Contents
**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
SYMBOL| PARAMETER| NOTES| MIN TYP MAX|
UNITS
---|---|---|---|---
VIN(MAX)| Max Input Voltage| | 40| V
VOUT(MAX)| Max Output Voltage| Output capacitor rating limited. Replace for
higher VOUT.| 40| V
IL(LIM)| Inductor Current Limit| | 1.3 1.7 2.3| A
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.
-
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.
-
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. -
Check for proper output voltage. The output should be regulated at the programmed value (±5%).
-
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
V OUT (V)| R 1 ( Ω )| R 2 (
Ω )
---|---|---
3.0| 2M| 1M
5.0| 2M| 499k
6.0| 2M| 402k
7.0| 2M| 332k
8.0| 2M| 287k
9.0| 2M| 249k
10.0| 2M| 221k
11.0| 2M| 200k
12.0| 2M| 182k
13.0| 2M| 165k
14.0| 2M| 154k
15.0| 2M| 143k
16.0| 2M| 133k
17.0| 2M| 124k
18.0| 2M| 118k
19.0| 2M| 110k
20.0| 2M| 105k
21.0| 2M| 100k
22.0| 2M| 95.3k
23.0| 2M| 90.9k
24.0| 2M| 86.6k
25.0 (Note 1)| 2M| 82.5k
30.0 (Note 1)| 2M| 69.8k
35.0 (Note 1)| 2M| 59k
40.0 (Note 1)| 2M| 51.1k
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
VIOC SETTING REFERENCES| R BOT| R TOP| R
MAX
---|---|---|---
VOUT Reference Designators| R2| R1| R8
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
ITEM| QTY| REFERENCE| PART DESCRIPTION|
MANUFACTURER/PART NUMBER
---|---|---|---|---
1| 1| PCB| PRINTED CIRCUIT BOARD| ANALOG DEVICES 08_059797a
2| 2| C1, C2| CAP CER 68NF 16V 10% X7R 0402| SAMSUNG CL05B683KO5NNNC
3| 1| C10| CAP CER C0G, FOR COMMERCIAL APP| VISHAY VJ0402A100JXAAP54
4| 1| C11| CAP MONO CER CHIP FOR AUTOMOTIVE, X7R| MURATA GCM155R71E473KA55D
5| 1| C12| CAP MLCC 0402 (Note 2)| N/A
6| 2| C4, C13| CAP CER 22UF 25V 20% X7R 1812| TDK C4532X7R1E226M250KC
7| 2| C14, C15| CAP MLCC 0402 (Note 2)| N/A
8| 1| C3| CAP CER X7R| SAMSUNG CL10B475KQ8NQNC
9| 1| C5| CAP CER X5R, GENERAL PURPOSE| AVX CORPORATION 06033D105KAT2A
10| 1| C6| CAP CER CHIP X7R| TDK C5750X7R1H106M
11| 1| C7| CAP ELECTROLYTIC (Note 2)| N/A
12| 1| C8| CAP CER X7R| AVX 12065C105KAT2A
13| 1| C9| CAP CER 4700PF 25V 10% X7R 0402| SAMSUNG CL05B472KA5NNNC
14| 1| D1| DIODE LOW VF MEGA SCHOTTKY BARR RECT| NXP SEMICONDUCTORS
PMEG2010AEH,115
15| 1| D2| DIO SCHOTTKY BARRIER RECTIFIER, 2A| NEXPERIA PMEG6020ER
16| 1| INPUT| CONN-PCB MALE HEADER 3POS 2.54MM PITCH R/A GOLD| SULLINS
PBC03SBAN
17| 1| L1| IND SHIELDED POWER 0.0163OHM DCR, 6.01A| COILCRAFT INC.
MSS1048-682NLB
18| 1| OUTPUT| CONN FEMALE 3POS 2.54MM PITCH R/A GOLD| SULLINS PPPC031LGBN-RC
19| 1| P1| CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY STRAIGHT 2MM PITCH|
MOLEX 53253-0370
20| 1| R1| RES SMD 2M OHM 1% 1/8W 0805| YAGEO RC0805FR-072ML
21| 1| R10| RES STANDARD THICK FILM CHIP JUMPER, FOR AUTOMOTIVE| VISHAY
CRCW08050000Z0EA
22| 4| R6, R9, R11, R12| RES THICK FILM 0805 (Note 2)| N/A
23| 1| R2| RES PRECISION THICK FILM CHIP| PANASONIC ERJ-6ENF4993V
24| 1| R3| RES PRECISION THICK FILM CHIP| PANASONIC ERJ-6ENF1002V
25| 1| R4| RES PRECISION THICK FILM CHIP| PANASONIC ERJ-2RKF2742X
26| 1| R5| RES THICK FILM CHIP, GENERAL PURPOSE| YAGEO RC0805JR-071ML
27| 1| R7| RES THICK FILM 0402 (Note 2)| N/A
28| 1| R8| RES PRECISION THICK FILM CHIP| PANASONIC ERJ-6ENF49R9V
29| 1| U1| IC-ADI 40V, 1A SYNCHRONOUS BUCK-BOOST DC/DC CONVERTER WITH
PROGRAMMABLE OUTPUT CURRENT| ANALOG DEVICES LTC3114MPDHC-1#PBF
30| 1| VIOC| CONN FEMALE 2POS 2.54MM PITCH R/A GOLD| SULLINS PPPC021LGBN-RC
SCHEMATIC DIAGRAM
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ESD (electrostatic discharge) sensitive device.
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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
- LTC3114-1 Datasheet and Product Info | Analog Devices
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