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1 description linduino one isolated arduino-compatible demonstration board linear technologys dc2026 ( called the linduino one) is compatible with the arduino uno microcontroller board. arduino hardware consists of an atmel microcontroller with a bootloader allowing quick in-circuit firmware up - dates. the software is a simple programming environment based on the avrgcc compiler. this platform is popular because it is easy to use, both the hardware and software are open source, and it can be programmed in c. we find it an ideal way to demonstrate and distribute libraries for integrated circuits that have digital interfaces such as inter- integrated circuit ( i 2 c ) and serial peripheral interface (spi). while the linduino one is arduino-compatible, it is not produced by the official arduino team, and they do not receive any monetary support from this board. please, consider supporting them by purchasing other items from: http://store.arduino.cc l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and quikeval is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. the linduino one adds several features to the standard arduino uno board: ? a 14-pin quikeval ? connector provides a direct connec - tion to a growing list of hundreds of linear technology demo boards, including adcs, dacs, power system management, rf synthesizers, system monitor and control, and many others. ? an lt m ? 2884 provides galvanic isolation of usb data and power for both safety and noise rejection. ? auxiliary 7 v to 20 v power input on isolated side, with conversion to 5 v provided by an lt ? 3973 allowing high power operation up to 750ma. design files for this circuit board are available at http://www .linear.com/demo figure 1. linduino one basic connections in-circuit programming header arduino shield headers arduino shield headers quik-eval compatible demo board 14 conductor ribbon cable auxiliary power usb to coumputer 7v to 20v + ? DC2026Afa demo manual DC2026A
2 quick s tart gui d e the linduino one comes preloaded with a dc590 emula- tor program ( called a sketch) that allows attached demo boards to run with the standard quikeval gui software. this allows the functionality of the board to be verified before starting firmware development. after evaluation with quikeval, the linduino one can be reprogrammed with customer code. there is a top-level demonstration sketch for each parts library that provides a text terminal interface to the board, demonstrating the library functions. the linduino one is also available as dc2107, which includes a dc934 as an easy to use example daughter board. dc934 is the demonstration board for the lt c ? 2607 dual 16- bit, i 2 c digital to analog converter ( dac). this board also has an ltc2422 2-channel, 20- bit, spi inter- face analog to digital converter ( adc) that reads back the dac output. thus, this board demonstrates operation of both spi and i 2 c interfaces, and multichannel adcs and dacs. the following sections describe the procedure for installing the required software and operating the dc934 with both quikeval software and with a terminal based demo program. while this manual describes operation with the dc934, the procedure applies to other boards as well. software installation 1) download ltsketchbook.zip from http://www.linear. com/designtools/linduino.php this is the entire code base for the linduino board, including all demo code, libraries for individual devices, auxiliary functions, and html documentation. extract this file to a location for working files, such as your my documents directory or c:\projects. 2) note: if quikeval is already installed, please update to the latest version by selecting tools update pro - gram, then proceed to step 3. if not, download and run quikeval from www.linear.com/software . this installs the quikeval program, as well as the ftdi usb drivers required for the linduino one ( and other linear tech - nology inter face boards.) drivers are also distributed with the arduino ide, but it is recommended to let quikeval install the drivers to ensure compatibility with the linduino one. you will be prompted to connect the board to the pc during installation. once the installation is complete, quit quikeval. 3) download the arduino integrated development envi - ronment (ide) from either http://arduino.cc/en/main/software or http://www.linear.com/designtools/linduino.php ( version 1.0.4 is used in this manual.) this is not an installer; no installation is necessary. extract the con- tents of this file to a convenient location for programs, such as c:\program files. the arduino.exe file is the actual program file; double-click to open the arduino ide. DC2026Afa demo manual DC2026A
3 quick s tart gui d e arduino ide setup 1) from within the arduino ide, click on file preferences under sketchbook location: select browse, and locate the path to the extracted ltsketchbook.zip file. the correct location will show ltsketchbook in the look in menu, and at least four subdirectories will be shown: documenta - tion, libraries, part number and utilities (more may be added in the future). click open, then click ok. DC2026Afa demo manual DC2026A
4 2) under tools menu, select board arduino uno quick s tart gui d e 3) under the t ools menu, select serial port . there may be more than one option; the linduino one is usually the highest com port number (com12 is shown below). DC2026Afa demo manual DC2026A
5 quick s tart gui d e 4) click on the serial monitor, which looks like a magnifying glass: this will bring up the monitor window: select newline terminator and set the baud rate to 115200. you should see a hello message C this indicates that serial communication is set up properly, and that the dc590 emulator firmware is properly installed. pressing the reset button on the linduino one will cause the message to be sent again. if this message does not appear, try a different com port. ( note : the dc590 emulator sketch can be restored by following the procedure detailed below for uploading the dc934 sketch, substituting the dc590 sketch which is located in file sketchbook utilities dc590b.) 5) quit the arduino ide. note that a restart is required ever y time the sketchbook location is changed. DC2026Afa demo manual DC2026A
6 quick s tart gui d e running with quikeval linear technology demo boards with the 14- pin quikeval connector are normally used in conjunction with a dc590b interface board and the quikeval software package running on a pc. designers can then use the software to evaluate the performance of the product on the demo board. the linduino one comes programmed with firmware that al - lows it to emulate the dc590b controller, so the quikeval software can be used to check basic functionality in a target system. connect the dc934 to the linduino one with the supplied 14-pin ribbon cable. run quikeval. the control panel for the ltc2607 will appear, and clicking collect will start communication with the board. the onboard ltc2422 adc reads back the output voltages, and the voltage may be changed by entering a number in the appropriate box or by moving the sliders. quit quikeval after this step. DC2026Afa demo manual DC2026A
7 running with the linduino demonstration program after the dc934 has been run with the user-friendly quikeval gui, a demonstration program can be loaded into the linduino one that demonstrates the library functions for the ltc2607 and ltc2422. 1) open the arduino ide. find the part number on the demo board, ltc2607 in this case. in the file menu select sketchbook part number 2000 2600 2607 dc934a. ( there may be other entries for a particular part number showing example usage cases, experiments, etc. the entry for the demo circuit number is the general-purpose demonstration program and is a good place to start.) quick s tart gui d e DC2026Afa demo manual DC2026A
8 a new window will appear with the sketch. 2) upload the sketch by clicking the upload button: when this process is completed, a message at the bottom should display a similar message as shown. quick s tart gui d e DC2026Afa demo manual DC2026A
9 quick s tart gui d e 3) open the serial monitor (magnifying glass icon) once more. the monitor will now display the program interface. to use the program, enter commands into the text box, then click the send button. DC2026Afa demo manual DC2026A
10 quick s tart gui d e going further after completing the procedure in this quick start guide, all of the tools are in place to move on to other products or further experimentation with the dc934. the main page for all linduino resources is: http://www.linear.com/designtools/linduino.php html documentation for the code is provided in the sketchbook in the documentation subdirectory. external connections j1: quikeval header C connection to quikeval demonstra - tion board . this connector provides 5 v at 50ma, 7.6 v at 50ma, spi and i 2 c interfaces, and an auxiliary i 2 c interface for identification of the attached demonstration board. j2 : ac adaptor in C 2.1 mm 5.5 mm barrel connector. optional dc power input , 7 v to 20 v dc. with external power applied, up to 750 ma can be drawn from the 5 v supply ( available on pins 2 and 5 on j3, or pin 10 on j1.) j3, j6, j7, j8: arduino shield headers. these headers are compatible with standard arduino shield add - on boards. refer to schematic for individual signals. j4: icsp C in-circuit serial programming header. used in conjunction with an external programming tool such as an avr dragon or jtagice3. j5 : usb C connection to the host computer. power for the linduino and the connected daughter board is also taken from j5 if no external power is supplied to j2. jumpers jp1 : factory use only. jp2 : reset configuration, not installed. when the icsp header is used with an external tool, install a 3 position, 0.1" header in this location and cut the trace labeled norm on the back side of the board. place jumper in the right- hand position ( opposite to norm) to allow the icsp tool to control the reset signal, install in the norm position to allow the ft 232 dtr signal to control reset ( this is normal arduino operation, and required to program the board from within the arduino ide.) leds on : lights when 5 v supply is on, from which all other supply voltages are generated. sck : lights when arduino pin 13 ( sck on the spi bus) is high. this is the pin used in the blink sketch under file examples basics blink. rx : lights when data is being received from the host computer through the usb port. tx : lights when data is being sent to the host computer through the usb port. reset button (s1): asserts the atmega328s reset line, restarting program execution. DC2026Afa demo manual DC2026A
11 block dia g ram 5v_usb gnd_usb d + _usb d ? _usb 5v_iso gnd_iso 5v usb ac adapter 7v to 20v max 200ma pc usb d + _iso d ? _iso ltm2884 usb isolator ltc4411 ideal diode ftdi usb-to-serial 5v d + d ? tx rx dtr lt3973 buck max 750ma in out lt1761 ldo atmega328p pins a0-a5 pins 2-13 pin 13/spi sck pin a4/i 2 c sda pin a5/i 2 c scl pin 11/spi mosi 5v pin 0 pin 1 reset serial i/o (for adc) i/o lt3461 boost max 750ma in out in out 3.3v lt1761 ldo lt1761 ldo in out in out 5v low noise 5v low noise j1 5v 7v 7v 7.6v 5v v + 5v gpio scl/sck sda/mosi miso cs gnd eev cc eescl eeda eegnd pin 9 pin 8 pin 12 pin 10 pin a5 pin a4 pin 12 pin 10 pin names correspond to arduino pins. pin 8 switches mux between microcontroller i 2 c port (pins a4, a5) and microcontroller spi port (pins 11, 13) demo board eeprom (eesci, eesda) is always connected to microcontroller i 2 c port (pins a4, a5) dc2026 bd DC2026Afa demo manual DC2026A
12 item qty reference part description manufacturer/ part number 1 2 c1, c7 cap., x5r, 4.7f, 16v 10% 0603 tdk, c1608x5r1c475k 2 3 c2, c8, c14 cap., x7r, 0.01f, 16v 10% 0603 avx , 0603yc103 kat 2a 3 4 c3, c9, c12, c15 cap., x5r, 10f, 16v 10% 0805 murata, grm21br61c106ke15l 4 5 c4, c13, c17, c18, c23 cap., x7r, 1f, 16v 10% 0603 tdk, c1608x7r1c105k 5 1 c5 cap., npo, 15pf, 50v 10% 0603 avx , 06035a150 kat 2a 6 1 c6 cap., x5r, 4.7f, 25v 10% 0805 tdk, c2012x5r1e475k 7 1 c10 cap., cog, 10pf, 25v 10% 0402 avx , 04023a100 kat 2a 8 1 c11 cap., x5r, 22f, 6.3v 20% 1206 taiyo yuden, jmk316bj226ml-t 9 1 c16 cap., x7r, 2.2f, 50v 10% 1206 murata, grm31cr71h225ka88l 10 6 c19, c20, c21, c22, c25, c28 cap ., x7r, 0.1f, 16v 10% 0603 av x , 0603yc104 kat 2a 11 1 c24 cap., x7r, 0.047f, 16v 10% 0603 avx , 0603yc473 kat 2a 12 1 c26 cap., alum., 10f 50v 10% smt sun elect., 50ce10bss 13 1 c27 cap., x5r, 0.22f, 10v 20% 0402 avx , 0402zd224 mat 2a 14 0 c29 cap., opt , 0805 option 15 2 c30, c31 cap., x7r, 2.2nf, 1kv 10% 1206 avx , 1206ac222 kat 1a 16 3 d1, d4, d5 led,yellow, diffused, 0805 avago , hsmy-c170 17 1 d2 led,green, diffused, 0805 avago , hsmg-c170 18 1 d 3 diode, schot tky, 100v 2a, smb diodes inc., b2100-13-f 19 1 j1 header, 27 dual row molex 87831-1420 20 1 j2 connector, power jack, 2.1mm cui inc., pj-002ah 21 2 j3, j8 conn., recept., 0.100, 8 position sullins, pppc081lfbn-rc 22 1 j4 header, 2mm 3mm pin, 0.100 samtec, tsw-103-07-g-d 23 1 j5 connector, usb type b, right angle pcb mount fci, 61729-0010blf (6tbs 44) 24 1 j6 conn., recept., 0.100, 10 position sullins, pppc101lfbn-rc 25 1 j7 conn., recept., 0.100, 6 position sullins, pppc061lfbn-rc 26 1 l1 inductor, 15h, 1.3a, smd cooper/coiltronics, mpi4040r3-150-r 27 1 l2 inductor, shielded power, 10h, smt coilcraft, xfl3010-103me 28 1 q1 transistor, mosfet, n-ch 60v,150ma, sot-23 diodes inc., vn10lf 29 1 r1 res., chip, 64.9k, 1/10w, 1% 0603 vishay, crcw060364k9fkea 30 1 r2 res., chip, 47.5k, 1/10w, 1% 0603 vishay, crcw060347k5fkea 31 1 r3 res., chip, 215k, 1/10w, 1% 0603 vishay, crcw0603215kfkea 32 1 r4 res., chip, 13.7k, 1/10w, 1% 0603 vishay, crcw060313k7fkea 33 1 r5 res., chip, 42.2k, 1/10w, 1% 0603 vishay, crcw060342k2fkea 34 5 r6, r7, r8, r9, r10 res., chip, 4.99k, 1/10w, 1% 0603 vishay, crcw06034k99fkea 35 0 r11, r17, r19, r32 res., chip, opt , 0805 optional 36 8 r12, r13, r15, r20, r21, r22, r23, r24 res ., chip, 1k, 1/10w, 1% 0603 visha y, crcw06031k00fkea 37 1 r14 res., chip, 1m, 1/16w, 1% 0402 visha y, crcw04021m00fked 38 1 r16 res., chip, 1m, 1/10w, 1% 0603 vishay, crcw06031m00fkea 39 1 r18 res., chip, 10k, 1/10w, 1% 0603 vishay, crcw060310k0fkea 40 0 r25 res., chip, opt , 0603 optional p arts l ist DC2026Afa demo manual DC2026A
13 p arts l ist item qty reference part description manufacturer/ part number 41 1 r26 res., chip, 0.20, 1/4w, 5% 0805 panasonic, erj-s6sjr20v 42 1 r27 res., chip, 107k, 1/16w, 1% 0402 vishay, crcw0402107kfked 43 1 r28 res., chip, 475k, 1/16w, 1% 0402 vishay, crcw0402475kfked 44 1 r29 res., chip, 215k, 1/16w, 1% 0402 vishay, crcw0402215kfked 45 1 r30 res., chip, 316k, 1/16w, 1% 0402 vishay, crcw0402316kfked 46 1 r31 res., chip, 100?, 1/16w, 5% 0603 vishay, crcw0603100rjkea 47 1 s1 switch, pushbutton, miniature w rth , 434 111 025 826 48 1 u1 module, usb transceiver, bga-44 linear tech., ltm2884cy#pbf 49 1 u2 ic, dc/dc converter, tsot-23 linear tech., lt3461es6#pbf 50 1 u3 ic, ldo micropower regulator, 5v, tsot-23 linear tech., lt1761es5-5#pbf 51 1 u4 ic, analog switch, 10-msop fairchild, fsa2257mux 52 1 u5 ic, ldo micropower regulator, 3.3v, tsot-23 linear tech., lt1761es5-3.3#pbf 53 1 u6 ic, ideal diode, low loss,tsot-23 linear tech., ltc4411es5#trmpbf 54 1 u7 ic, microcontroller atmel, atmega328p-au 55 1 u8 ic, ldo micropower regulator, adjustable, tsot-23 linear tech., lt1761es5-byp#trmpbf 56 1 u9 ic, usb uart, 28-ssop ftdi, ft 232rl-reel 57 1 u10 ic, step-down regulator, ms10 linear tech., lt3973emse#pbf 58 1 y1 resonator, 16mhz, smt murata, cstce16m0v53-r0 DC2026Afa demo manual DC2026A
14 s chematic dia g ram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 01/07/2013 linear technology isolated ltm2884 analog in norm icsp 01/07/2013 note: all resistors and capacitors are size 0603 unless otherwise specified. arduino-compatible demonstration board m.hawkins d.eddleman opt from u1 digital(pwm~) power sck from j2, page 2 tx rx on io page 2 mux sel reset trace on bottom side linduino one: a0 a1 a2 a3 7 ~6 ~5 4 ~3 2 aref rx_0 tx_1 12 8 ~9 reset scl sda aref gnd 13 12 ~11 ~10 ~9 8 7 ~6 ~5 4 ~3 2 tx_1 rx_0 scl sda ~10 a5 a4 a3 a2 a1 a0 gnd reset 13 sck/scl mosi/sda a5 a4 ~11 13 +5v +5v +5v +5v +5v 5v_low_noise 7v 5v_low_noise +5v +5v 3v3 +5v +5v +5v diso- diso+ vin revision history description date approved eco rev d.eddleman production 2 - revision history description date approved eco rev d.eddleman production 2 - revision history description date approved eco rev d.eddleman production 2 - size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology 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 schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2026a 1 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology 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 schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2026a 1 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology 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 schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2026a 1 2 n/a r31 100 r31 100 u7 atmega328p-au u7 atmega328p-au pc6 (reset) 29 pb6(xtal1/tosc1) 7 aref 20 gnd 5 gnd 3 avcc 18 gnd 21 pb7(xtal2/tosc2) 8 vcc 4 vcc 6 adc7 22 adc6 19 pdo(rxd) 30 pd1(txd) 31 pd2(int0) 32 pd3(int1) 1 pd4(xck/t0) 2 pd5(t1) 9 pd6(ain0) 10 pd7(ain1) 11 pc0(adc0) 23 pc1(adc1) 24 pc2(adc2) 25 pc3(adc3) 26 pc4(adc4/sda) 27 pc5(adc5/scl) 28 pb0(icp1) 12 pb1(oc1a) 13 pb2(ss/oc1b) 14 pb3(mosi/oc2a) 15 pb4(miso) 16 pb5(sck) 17 c21 0.1uf 16v c21 0.1uf 16v d5 yellow d5 yellow 2 1 r8 4.99k r8 4.99k r6 4.99k r6 4.99k c20 0.1uf 16v c20 0.1uf 16v c25 0.1uf c25 0.1uf c28 0.1uf 16v c28 0.1uf 16v d4 yellow d4 yellow 2 1 r16 1 meg r16 1 meg d1 yellow d1 yellow 2 1 r18 10k r18 10k c23 1.0uf 16v c23 1.0uf 16v r12 1k r12 1k j1 j1 v+ 1 gnd 3 miso 5 mosi/sda 7 eesda 9 eescl 11 gnd 13 5v 2 sck/scl 4 cs 6 gnd 8 eevcc 10 eegnd 12 gpio 14 c19 0.1uf 16v c19 0.1uf 16v jp2 jp2 2 3 1 y1 16 mhz y1 16 mhz 1 3 2 u9 ft232rl u9 ft232rl txd 1 rxd 5 rts# 3 cts# 11 dtr# 2 dsr# 9 dcd# 10 ri# 6 cbus0 23 cbus1 22 cbus2 13 cbus3 14 cbus4 12 test 26 gnd 21 gnd 18 gnd 7 agnd 25 vccio 4 vcc 20 usbdm 16 usbdp 15 nc 8 reset# 19 nc 24 osci 27 osco 28 3v3out 17 r23 1k r23 1k r21 1k r21 1k j7 j7 1 2 3 4 5 6 j6 j6 1 2 3 4 5 6 7 8 9 10 u4 fsa2257mux u4 fsa2257mux 1b1 6 2a 9 2s 2 1b0 5 2b1 1 2b0 10 gnd 8 vcc 3 1s 7 1a 4 r10 4.99k r10 4.99k j4 j4 1 3 5 6 4 2 d2 green d2 green 2 1 r22 1k r22 1k r25 opt r25 opt r24 1k r24 1k tp4 tp4 1 r13 1k r13 1k r15 1k r15 1k tp3 tp3 1 r20 1k r20 1k r7 4.99k r7 4.99k j8 j8 1 2 3 4 5 6 7 8 c18 1.0uf 16v c18 1.0uf 16v j3 j3 1 2 3 4 5 6 7 8 r9 4.99k r9 4.99k q1 vn10lf q1 vn10lf 1 2 3 c22 0.1uf 16v c22 0.1uf 16v s1 s1 DC2026Afa demo manual DC2026A
15 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. s chematic dia g ram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 3.3v ac adaptor in usb gnd usb usb gnd m.hawkins d.eddleman note: all resistors and capacitors are size 0603 unless otherwise specified. to u9 page 1 to j3, page 1 opt trace on bottom side linear technology isolated arduino-compatible demonstration board linduino one: usb gnd usb gnd output 7.6v @ 100ma 3.3v output 50ma max ac adaptor 5v output 750ma max usb 5v output 200ma max 7v-20v input 7.6v usbd- usbd+ usbvcc usbgnd +5v +5v 3v3 +5v 7v 5v_low_noise +5v diso+ diso- vin size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology 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 schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2026a 2 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology 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 schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2026a 2 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology 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 schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2026a 2 2 n/a tp1 tp1 1 r14 1meg 0402 r14 1meg 0402 r28 475k 0402 r28 475k 0402 c15 10uf 16v 0805 c15 10uf 16v 0805 d3 b2100 d3 b2100 2 1 r4 13.7k r4 13.7k r32 opt r32 opt r17 opt 0805 r17 opt 0805 r11 opt 0805 r11 opt 0805 u3 lt1761es5-5 u3 lt1761es5-5 gnd 2 byp 4 in 1 vout 5 shdn 3 r3 215k r3 215k j5 j5 1 2 3 4 5 6 jp1 jp1 2 1 c9 10uf 16v 0805 c9 10uf 16v 0805 c12 10uf 16v 0805 c12 10uf 16v 0805 + c26 10uf 50v suncon + c26 10uf 50v suncon r26 0.20 ohms 0805 1/4w r26 0.20 ohms 0805 1/4w c14 0.01uf 16v c14 0.01uf 16v u6 ltc4411es5 u6 ltc4411es5 gnd 2 stat 4 in 1 vout 5 ctl 3 c24 0.047uf 16v c24 0.047uf 16v c4 1.0uf 16v c4 1.0uf 16v c17 1.0uf 16v c17 1.0uf 16v c27 0.22uf 0402 c27 0.22uf 0402 r5 42.2k r5 42.2k c16 2.2uf 1206 50v c16 2.2uf 1206 50v c7 4.7uf 16v c7 4.7uf 16v r1 64.9k r1 64.9k u8 lt1761es5-byp u8 lt1761es5-byp gnd 2 byp 3 in 1 vout 5 adj 4 u5 lt1761es5-3.3 u5 lt1761es5-3.3 gnd 2 byp 4 in 1 vout 5 shdn 3 c11 22uf 1206 c11 22uf 1206 c10 10pf cog 0402 c10 10pf cog 0402 c8 0.01uf 16v c8 0.01uf 16v c3 10uf 16v 0805 c3 10uf 16v 0805 r2 47.5k r2 47.5k r30 316k 0402 r30 316k 0402 c2 0.01uf 16v c2 0.01uf 16v c31 2.2nf 1kv 1206 c31 2.2nf 1kv 1206 j2 j2 2 3 1 l2 10uh l2 10uh 1 2 r27 107k 0402 r27 107k 0402 tp2 tp2 1 c6 4.7uf 25v 0805 c6 4.7uf 25v 0805 c30 2.2nf 1kv 1206 c30 2.2nf 1kv 1206 c13 1.0uf 16v c13 1.0uf 16v r29 215k 0402 r29 215k 0402 l1 15uh smt l1 15uh smt 1 2 r19 opt 0805 r19 opt 0805 u10 lt3973ems u10 lt3973ems pg 9 rt 10 boost 7 en/uvlo 3 out 2 gnd 11 gnd 5 vin 4 fb 1 bd 8 sw 6 c29 opt c29 opt u1 ltm2884cy u1 ltm2884cy d1+ a2 d1- a1 spnd-pwr a3 on a4 vlo a5 gnd b1 gnd b2 gnd b3 gnd b4 gnd b5 gnd b6 gnd b7 gnd b8 gnd b9 gnd b10 gnd b11 gnd2 k1 gnd2 k2 gnd2 k3 gnd2 k4 gnd2 k5 gnd2 k6 gnd2 k7 gnd2 k8 gnd2 k9 gnd2 k10 gnd2 k11 gnd2 l3 gnd2 l4 gnd2 l6 gnd2 l7 gnd a6 vbus a7 vcc a8 vcc a9 vcc a10 vcc a11 d2- l1 d2+ l2 vlo2 l5 vcc2 l8 vcc2 l9 vcc2 l10 vcc2 l11 c5 15pf c5 15pf c1 4.7uf 16v c1 4.7uf 16v u2 lt3461es6 u2 lt3461es6 sw 1 gnd 2 fb 3 vin 6 shdn 4 vout 5 DC2026Afa demo manual DC2026A
16 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 2013 lt 0913 rev a ? printed in usa demonstration board important notice linear technology corporation ( lt c ) provides the enclosed product(s) under the following as is conditions: this demonstration board ( demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by lt c for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither p arty shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases lt c from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever. lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a lt c applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation DC2026Afa demo manual DC2026A

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