DEMO MANUAL DC2255A LTC3106EUDC 300mA, Low Voltage Buck-Boost Converter with PowerPath and 1.6µA Quiescent Current DESCRIPTION Demonstration circuit DC2255A features the LTC®3106, an ultralow input voltage buck-boost DC/DC converter with automatic PowerPath™ management optimized for multisource, low power systems. Burst Mode® operation architecture allows the LTC3106 to run very efficiently with as little as 1.6µA of input current at no load. Programmable accurate RUN threshold as well as maximum power point control (MPPC) allow for simple optimization of power transfer between the power source and the input supply to the DC2255A. Selectable peak current limit (100mA or 725mA) also allows the LTC3106 to adapt to a wide variety of input supplies. An accurate RUN threshold voltage of VIN = 1.2V is set by positioning the shunt on JP12 in the middle position. This threshold is set by the values of R4 and R5. For maximum power point control setpoint above 0.6V, it is usually better to use the accurate RUN functionality. See the data sheet for more details. Maximum power point control is enabled by setting JP5 to VCC. The value of R3 sets the MPPC threshold. The DC2255A has four user selectable output voltages: 1.8V, 2.2V, 3.3V and 5V. When the LTC3106 is enabled, the PGOOD pin asserts low if VOUT is below the regulation voltage. If JP3 is set to VOUT the red PGOOD indicator LED on the board lights up when the output is in regulation. PERFORMANCE SUMMARY SYMBOL PARAMETER This is a visual indication of VOUT being in regulation and is not needed for normal operation. To minimize current consumed, set JP3 to NC. The LTC3106 can operate with either a primary or secondary battery on its VSTORE supply. In secondary mode (JP7 set to GND), the part will use excess power to trickle charge the battery on VSTORE. There are four pin selectable OV/UV thresholds for the battery voltage in this mode to allow operation with a variety of secondary batteries. If the DC2255A is operated in secondary mode, a Schottky diode must be placed between the SW2 and VAUX pins. The LTC3106 requires no external compensation and provides good line and load transient response across the entire VIN range for each output voltage setting. This simplifies the design process while reducing the external component count. The LTC3106 data sheet has detailed information about the operation, specifications, and applications of the part. The data sheet should be read in conjunction with this quick start guide. Design files for this circuit board are available at http://www.linear.com/demo/DC2255A L, LT, LTC, LTM, Linear Technology, the Linear logo, Dust and Burst Mode are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C CONDITIONS MIN TYP 0.350 VIN 2.1 VSTORE VOUT 1.8V, 2.2V, 3.3V and 5V Selectable Output Voltages IOUT VIN > VOUT Efficiency Option Dependent 300 MAX UNITS 5.1 V 4.3 V V mA See Figures 1, 2 dc2255af 1 DEMO MANUAL DC2255A PERFORMANCE SUMMARY 90 90 80 80 EFFICIENCY (%) 100 EFFICIENCY (%) 100 70 60 50 40 0.1 VIN = 1.2V VIN = 1.8V VIN = 2.5V VIN = 3.3V VIN = 4V VIN = 5V 1 10 LOAD (mA) 70 60 50 100 40 0.01 1000 dc2255a F01 VSTORE = 3V VSTORE = 4V 0.1 1 10 LOAD (mA) 100 1000 dc2255a F02 Figure 1. DC2255A Efficiency vs Load with Part Running from VIN. VOUT = 3.3V Figure 2. DC2255A Efficiency vs Load with Part Running from VSTORE Input. VOUT = 3.3V VAUX VAUX VOUT VOUT IL IL dc2255a F03 Figure 3. DC2255A Normal VAUX, VOUT and Inductor Current Behavior. The Middle VOUT Charging Period Terminates Early to Charge Up VAUX Because VAUX Takes Priority Over VOUT dc2255a F04 Figure 4. DC2255A Load Step Response. VIN = 3V, VOUT = 3.3V, Load Step is from 40mA to 200mA dc2255af 2 DEMO MANUAL DC2255A QUICK START PROCEDURE Using short twisted pair leads for any power connections and with all loads and power supplies off, refer to Figure 5 for the proper measurement and equipment setup. The power supplies (PS1 and PS2) should not be connected to the circuit until told to do so in the procedure below. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN, VSTORE or VOUT and GND terminals (see Figure 6), or by using an oscilloscope probe tip jack. 3. Connect a 3.3mA load (1kΩ) to VOUT as shown in Figure 5. Connect an ammeter in series if accurate current monitoring is desired. 4. Turn on PS1 and slowly increase the voltage until the voltage at VIN is 1.2V. 5. Verify VOUT is ~3.3V. 6. VIN can now be varied between 600mV and 5.1V. VOUT should remain in regulation. If VIN is brought below 600mV, it will have to be brought back up above 1.2V to start up again. 1. Jumper, Battery, PS1 and PS2 settings to start: 7. Turn PS1 off. JP1, JP3: NC JP2: VSTORE 8. Turn on PS2 and slowly increase voltage until voltage at VSTORE is 2.5V. JP4, JP5, JP7, JP8, JP10, JP11: VCC JP6: VSTORE JP9: GND JP12: BYPASS Battery in BTH1 (CR2032): Not Populated PS1: OFF PS2: OFF 2. With power OFF connect the power supplies (PS1, PS2) as shown in Figure 5. If accurate current measurements are desired (for efficiency calculation for example) then connect ammeters in series with the supplies as shown. The ammeters are not required however. 9. Verify VOUT is ~3.3V. 10.VSTORE can now be varied between 2.1V and 4.3V. 11.If desired, turn off PS2 and populate BTH1 on the back of the board with a CR2032 or connect a different suitable battery (2.1V to 4.3V) to VSTORE. NOTE1: Connector J1 is used to connect DC2255A to a Dust® Mote (see Figure 7). If unused, set JP1 to NC. NOTE2: Connector J2 is used to facilitate connection to a solar cell PCB or other power supply board. Use of J2 is not required however, and solar cells or other suitable power sources can be connected directly to the VIN or VSTORE terminal on the DC2255A. CAUTION: DO NOT POWER VSTORE FROM AN EXTERNAL SUPPLY WITH A BATTERY IN BTH1. dc2255af 3 DEMO MANUAL DC2255A QUICK START PROCEDURE Figure 5. Proper Measurement and Equipment Setup VIN GND Figure 6. Measuring Input or Output Ripple dc2255af 4 DEMO MANUAL DC2255A QUICK START PROCEDURE Figure 7. DC2255A Top and Bottom View of DC2255A Connected to Dust Mote. dc2255af 5 DEMO MANUAL DC2255A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP CER 1µF 16V 10% X7R 0805 TDK, C2012X7R1C105K125AA Required Circuit Components 1 2 C1, C12 2 6 C2, C3, C4, C5, C6, C16 CAP CER 100µF 6.3V 20% X5R 1210 SAMSUNG, CL32A107MQVNNNE 3 1 C10 CAP CER 2.2µF 10V 20% X5R 0805 TDK, C2012X5R1A225M085AA 4 1 C11 CAP CER 47µF 10V 20% X5R 1210 SAMSUNG, CL32A476MPJNNNE 5 1 C14 CAP CER 0.1µF 6.3V 10% X7R 0805 KEMET, C0805C104K9RACTU 6 3 R1, R4, R5 RES 1M 1/10W 1% 0603 SMD PANASONIC, ERJ-3EKF1004V 7 1 R2 RES., CHIP, 4.99k, 1/10W, 0603 PANASONIC, ERJ-3EKF4991V 8 1 R3 RES 301k 1/10W 1% 0603 SMD PANASONIC, ERJ-3EKF3013V 9 1 D2 LED 0402 RED 50mW 20mA SMD ROHM, SML-P11VTT86 10 1 L1 INDUCTOR, SHIELDED 10µH COILCRAFT, LPS4018-103 11 1 Q1 MOSFET N-CHAN 20V SOT23-3 DIODES INC, ZXMN2F30FHTA 12 1 U1 300mA, LOW VOLTAGE BUCK-BOOST CONVERTER WITH PowerPath AND 1.6µA QUIESCENT CURRENT LINEAR TECHNOLOGY, LTC3106EUDC#PBF Additional Demo Board Circuit Components 13 0 C7, C8, C9, C13 1210 CASE SIZE 14 0 D1 DIODE SCHOTTKY 20V, 1A NXP, PMEG2010EA 15 0 C15 CAP 100µF –20% +80% 5.5V T/H EATON BUSSMANN, KR-5R5H104-R Hardware: For Demo Board Only 16 1 BATTERY CR2032 COIN CELL BATTERY DURACELL, CR2032 17 1 BTH1 CR2032 COIN CELL BATTERY HOLDER, SMD WURTH, 79527141 18 8 E1-E8 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0 19 11 JP1-JP11 3 PIN 0.079 SINGLE ROW HEADER SAMTEC, TMM-103-02-L-S 20 12 JP1-JP12 SHUNT SAMTEC, 2SN-BK-G 21 1 JP12 4 PIN 0.079 SINGLE ROW HEADER WURTH, 62000411121 22 4 (STAND-OFFS) STAND-OFF, NYLON 0.75" TALL KEYSTONE, 8834(SNAP ON) 23 1 J1 HEADER, 2X6, 12-PIN, SMT HORIZONTAL SOCKET W/KEY, 0.100" SAMTEC, SMH-106-02-L-D-05 24 1 J2 CONN RECEPT 20POS 0.50" SMT SAMTEC, SFMH-110-02-L-D-WT dc2255af 6 B A 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. JP3 LED E7 + 1 JP8 OS1 C15 OPT JP12 VCC BYPASS VIN R_STRING VSTORE PGOOD PGOOD NC VOUT VSTORE 2.1V - 4.3V VCC GND GND E3 VIN 350mV-5.1V E2 VIN GND OS1 C16 100uF 6.3V 1210 1 3 5 7 9 11 13 15 17 19 BTH1 VCC GND R4 VCC 1M JP9 NC R5 1M GND VCC 1 JP10 C2 100uF 6.3V 1210 VSTORE GND VOUT C12 1uF 16V 0805 JP6 SS1 GND GND VCC VCC JP11 SS2 ENVSTR VSTORE C14 0.1uF 6.3V 0805 4 19 14 20 11 13 16 1 L1 10uH SS2 VCC VCAP ENVSTR GND VCC JP7 PRI U1 LPS4018-103 VSTORE PRI RUN VIN NC LTC3106EUDC VCC ENVSTR PRI RUN C1 1uF 16V 0805 ENVSTR VSTORE C11 47uF 10V 1210 VSTORE VCC SS1 C3 100uF 6.3V 1210 VIN 2 4 6 8 10 12 14 16 18 20 OPT C13 1210 JP2 VCAP C4 100uF 6.3V 1210 VSTORE OS2 C5 100uF 6.3V 1210 VCAP OS2 VSTORE VIN RUN Q1 ZXMN2F30FH + VOUT IO1 IO2 NC NC GND VLDO V+ VBAT NC SFMH-1-10-02-L-D-WT +5V PGOOD VCAP NC NC NC EHORBAT GND RSVD VIN J2 D2 SML-P11VTT86 R2 4.99k VOUT VCAP PGOOD 1 2 3 2 1 2 I 18 SW1 GND 21 17 R3 301k SS2 SS1 OS2 OS1 JP5 MPPC VCC R1 1M NC VOUT JP1 DUST PWR R3 VCC JP4 ILIMSEL VCC GND C10 2.2uF 10V 0805 CUSTOMER NOTICE 8 12 9 10 6 5 7 2 3 VAUX THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 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. PRI MPP ILIMSEL SS2 SS1 OS2 OS1 PGOOD VOUT VCC D1 OPT PMEG2010EA VAUX SW2 GND 15 1 2 4 6 8 10 12 SCALE = NONE NC JIM N. PCB DES. APP ENG. 4.2V 4.0V 3.0V 2.9V 4.0V 2.1V 3.0V 2.15V 1.9V 2.78V VSTORE UV GND GND PGOOD GND GND E8 VCC VCC GND GND 5.0V 3.3V 2.2V 1.8V VOUT DATE: N/A SIZE 2 11-20-15 IC NO. SHEET 1 2 REV. OF 1 300mA, LOW VOLTAGE BUCK-BOOST CONVERTER WITH POWERPATH and 1.6uA QUIESCENT CURRENT LTC3106EUDC DEMO CIRCUIT 2255A 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only VCC GND VCC GND OS2 DATE 11-20-15 VOUT E6 E5 E4 E1 JIM N. APPROVED VOUT JUMPER CONFIGURATION OS1 * TECHNOLOGY GND VCC VCC GND GND VCC TITLE: SCHEMATIC SMH-106-02-L-D-05 VSUPPLY NC GND PGOOD KEY VBAT RSVDEHORBAT I/O 2 I/O 1 +5V V+ APPROVALS 1 3 5 7 9 11 VCC GND GND VCC GND GND GND GND VSTORE OV VSTORE JUMPER CONFIGURATION SS2 GND VOUT PGOOD C9 OPT 1210 SS1 * C8 OPT 1210 DESCRIPTION REVISION HISTORY PRODUCTION FAB PRI 1210 C7 OPT 2 - CAUTION: ONLY CONNECT IF VOUT IS LESS THAN 3.7V. PGOOD J1 VOUT C6 100uF 1210 REV ECO 2 B A DEMO MANUAL DC2255A SCHEMATIC DIAGRAM dc2255af 7 DEMO MANUAL DC2255A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) 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 LTC 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 PARTY 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 LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s 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. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC 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 LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc2255af 8 Linear Technology Corporation LT 0116 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016