LTC7106EDDB LINER | Alldatasheet
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Technical content
DESCRIPTION
Demonstration circuit 2620A-A uses the LTC7106EDDB, a precision, bidirectional, 7-Bit current DAC with PMBus interface and can be used to adjust the output voltage of any conventional VFB referenced regulator . The LTC7106 can work with the vast majority of power management controllers, regulators or modules to enable digital control of the output voltage. The DC2620A-A requires input voltage range from 2.5V to 5.5V, which can be powered either by external supply or directly from the DC1613A dongle. The LTC7106 pro- vides three ranges of IDAC output current: Nominal Range (–64µA to 63µA), Range High (– 256µA to 252µA) and Range Low (–16µA to 15.75µA). Only the nominal range is optimized with the highest accuracy. It is recommended that users design the resistor divider using the nominal range of the IDAC setting. All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY To explore the power system management features of the parts, download the GUI software L TpowerPlay® onto your PC and use ADI’ s I2C/SMBus/PMBus Dongle DC1613A to connect to the board. L TpowerPlay allows the user to reconfigure the part on-the-fly, view IDAC current value and fault status. GUI Download The software can be downloaded from: http://www.linear.com/LTpowerPlay For more details and instructions of L TpowerPlay, please refer to L TpowerPlay for LTC7106 Quick Start Guide. Design files for this circuit board are available at http://www.linear.com/demo/DC2620A-A Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VDD IC Bias Voltage 2.5 5.5 V VIDAC IDAC Operation Voltage 0.4 2.0 V IDAC Output Current Range Nominal, LSB = 1µA –64 63 µA Range High, LSB = 4µA –256 252 µA Range Low, LSB = 0.25µA –16 15.75 µA ACC IDAC Accuracy Nominal Range –1.5 0.8 %
for the system setup and boards connection. Figure 1. Demo Setup with PC
- Make sure JP3 is in OFF position to disable the LTC7106
before turning on the regulator .
- Turn on the regulator and check for the output voltage
- Once the proper output voltage is established on the
- Open the L TpowerPlay software and adjust the IDAC
Figure 3. L TpowerPlay Main Interface for LTC7106
The following procedure describes how to use L Tpow - erPlay to monitor and change the settings of LTC7106. 1. Download and install the L TPowerPlay GUI: http://www.linear.com/LTpowerPlay 2. Launch the L TpowerPlay GUI. a. The GUI should automatically identify the DC2620A-A. The system tree on the left-hand side should look like this: LTpowerPlay QUICK START PROCEDURE b. A blue message box shows for a few seconds in the lower left-hand corner , confirming that the LTC7106 is communicating: c. In the Toolbar , click the “R” icon (RAM to PC) to read the RAM from the LTC7106. This reads the configuration from the RAM of LTC7106 and loads it into the GUI. When first powering on, you should read IDAC current at zero (high impedance IDAC) due to the LTC7106’s internal power-on reset circuitry until a valid write takes place. The IDAC current value can be plotted in real time, shown in the following screenshot (at zero when first power- ing on):
d. If you want to change the IDAC current to 10μA for example, in the Config tab, type “10” in the MFR_ IOUT_COMMAND_LTC7106: LTpowerPlay QUICK START PROCEDURE Then, click the “ W” icon (PC to RAM) to write these register values to the LTC7106. If the write is successful, you will see the following message: In the Telemetry Plot, you will see IDAC current value change to the commanding value: e. If you want to change the IDAC current to a negative value (meaning sinking current), you need to change the MFR_IOUT_MAX_LTC7106 to a negative value first (see data sheet for more details).
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP ., 1.0μF, X5R, 10V, 10%, 0603 AVX, 0603ZD105KAT2A 2 1 C2 CAP ., 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A 3 4 R1, R5, R6, R9 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 4 3 R2, R3, R7 RES., 10k, 1%, 1/10W, 0603 KOA SPEER, RK73H1JTTD1002F 5 3 R10, R11, R12 RES., 100Ω, 1%, 1/10W, 0603 NIC, NRC06F1000TRF 6 1 U1 IC, DAC 7-BIT CURRENT DAC ANALOG DEVICES, LTC7106EDDB Additional Demo Board Circuit Components 1 0 C3 CAP ., OPTION, 0603 OPTION 2 0 R4 RES., OPTION, 0603 OPTION 3 0 JP4 CONN., OPTION OPTION 4 0 J2 CONN., OPTION OPTION Hardware 1 8 E1, E2, E3, E4, E5, E6, E7, E8 TEST POINT , TURRET , 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 J1 CONN., HDR, SHROUDED, 2mm × 6mm, 2mm, THT , VERT FCI, 98414-G06-12ULF 3 2 JP1, JP2 CONN., HDR, MALE, 1mm × 4mm, 2mm, THT , STR WURTH ELEKTRONIK, 62000411121 4 1 JP3 CONN., HDR., MALE, 1mm × 3mm, 2mm, THT , STR SULLINS CONNECTOR SOLUTIONS, NRPN031PAEN-RC 5 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10 6 4 MP1, MP2, MP3, MP4 STANDOFF , NYLON, SNAP-ON, 0.250" KEYSTONE, 8831 7 1 PCB1 PCB, DC2620A ANALOG DEVICES, 600-DC2620A 8 4 XJP1, XJP2, XJP3, XJP4 CONN., SHUNT , FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS AND CAPACITORS ARE 0603
REVISION HISTORY
ECO REV DESCRIPTION APPROVEDDATE [ j03/21/172 PROD VERSION IC (U1) R4 R5 R6 LTC7106EDDB LTC7106EDDB-1 OPT 0 698 [2] HEADER 10K OPT HEADER OPT JP4 [2] OPT OPT TO DC590B or LINDUINO DC2086C VDD VDD VDD VDD VDD VDD VDD VDD VDD VDD DATE: IC NO. SHEET OF TITLE: DEMO CIRCUIT SCHEMATIC, APPROVALS PCB DES. APP ENG. Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com SIZE: N/A SKU NO. SCHEMATIC NO. AND REVISION: PCA BOM: PCA ASS'Y: 1 1 \ \\ [ j 7-BIT CURRENT DAC WITH DIGITAL POWER SYSTEM MANAGEMENT 710-DC2620A_REV02 LTC7106EDDB-1(-B) LTC7106EDDB(-A) Thursday, September 28, 2017 705-DC2620A_REV02 700-DC2620A_REV02 DC2620A DATE: IC NO. SHEET OF TITLE: DEMO CIRCUIT SCHEMATIC, APPROVALS PCB DES. APP ENG. Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com SIZE: N/A SKU NO. SCHEMATIC NO. AND REVISION: PCA BOM: PCA ASS'Y: 1 1 \ \\ [ j 7-BIT CURRENT DAC WITH DIGITAL POWER SYSTEM MANAGEMENT 710-DC2620A_REV02 LTC7106EDDB-1(-B) LTC7106EDDB(-A) Thursday, September 28, 2017 705-DC2620A_REV02 700-DC2620A_REV02 DC2620A DATE: IC NO. SHEET OF TITLE: DEMO CIRCUIT SCHEMATIC, APPROVALS PCB DES. APP ENG. Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com SIZE: N/A SKU NO. SCHEMATIC NO. AND REVISION: PCA BOM: PCA ASS'Y: 1 1 \` \\ [ j 7-BIT CURRENT DAC WITH DIGITAL POWER SYSTEM MANAGEMENT 710-DC2620A_REV02 LTC7106EDDB-1(-B) LTC7106EDDB(-A) Thursday, September 28, 2017 705-DC2620A_REV02 700-DC2620A_REV02 DC2620A [2] JP3 ON OFF EN JP2 ASEL0 VDD FLOAT GND R7 10k VDD 10k SDA R9 0 100pF R10 100 J1 [2] TO DC1613A AUXP 1 SDA 2 GND 3 SCL 4 LGKPWR 5 ALERTB 6 GPIO_1 7 OUTEN_0 8 OUTEN_1 9 GND 10 AUXSCL 11 AUXSDA 12 [2] AUX IDAC GPO JP4 ON OFF GPOINV [2] GND ALERTB C1 1.0uF R11 100 R5 [2] J2 [2] V+ 1 3.3V or 5V 2 GND 3 SCK/SCL 4 MISO 5 CS 6 MOSI/SDA 7 GND 8 EESDA 9 EEVCC 10 EESCL 11 EEGND 12 GND 13 GPIO_1 14 OPT R12 100 SCL JP1 ASEL1 VDD FLOAT GND LTC7106EDDB SDA/SDI1 SCL/SCLK2 VDD3 ALERTB/SPIM4 GND5 IDAC 6 EN 7 GPO 8 SDO/ASELO 9 CSB/ASEL1 10 SDA SCL AUX ALERTB CSB SDOSDO SDA SCL CSB AUX
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