DEMO MANUAL DC1964A LTC3110 2A, Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer Description Demonstration circuit 1964A is a 2A, bidirectional buckboost DC/DC regulator and charger/balancer, featuring the LTC®3110 boost controller. Its wide voltage range both in capacitor/battery charger mode and in system backup mode makes it well suited to a wide variety of applications using supercapacitors and batteries. The main features of this board include a wide capacitor voltage range from 0.1V to 5.5V, when the controller works as a backup, buck-boost converter. The input voltage range is also wide, 1.8V to 5.25V, when the controller works as a charger. LTC3110 also features automatic switching from charge to backup mode, programmable ±2% accurate charge current, automatic capacitor balancing, Burst Mode® operation, multipurpose comparator, and open-collector outputs to indicate direction of operation and end of charge. The 1.2MHz constant-frequency operation results in a small and efficient circuit. In backup mode LTC3110 provides high output voltage accuracy over a wide load range with no minimum load requirement. DC1964A features two modes of operation: automatic and external direction control. In the automatic mode of operation, DC1964 automatically charges the supercapacitor when a system voltage is present and works as a DC/DC converter providing system backup power to the load when system power is removed. In the external direction mode, users have control over charging and discharging the supercapacitor by changing logic on the EXT/DIR terminal. The DC1964A supports three levels of input current limits—0.5A, 1A, 2A—while charging the supercapacitor. The DC1964A has a small circuit footprint. It is a high performance and cost effective solution for supercap, battery backup converters and chargers, servers, RAID and RF systems. DC1964 supports surface-mount supercapacitors as installed C3 and also through-hole packages as optional C5, C8. Design files for this circuit board are available at http://www.linear.com/demo/DC1964A L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Performance Summary PARAMETER CONDITIONS UNITS Minimum Input Supply Voltage 1.8 V Maximum Input Supply Voltage 5.5 V 1.8 to 5.25 V System Voltage Range Backup Mode Supercapacitor Voltage Range 0.1V to 5.5 Typical Switching Frequency 1.2 MHz 93 % Efficiency Typical, DC/DC Mode Backup Mode V dc1964afa 1 DEMO MANUAL DC1964A Quick Start Procedure Demonstration circuit 1964A is easy to set up to evaluate the performance of the LTC3110 bidirectional regulator. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below. 5V power supply should be rated minimum 2A of output current. NOTE: 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 or VOUT and GND terminals. See Figure 2 for proper scope probe technique. 5. Turn the input power source on and slowly increase the input voltage to 4.0V. Set the load to 0.2A. You have to see voltage around 3.6V (diode forward voltage drop lower compared to VEXT) on the VSYS terminal. 6. Place jumper RUN (JP2) in the ON position. Voltage on VCAP terminal should rise above 4.8V. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. To verify the ability of DC1964 to work in backup mode, proceed with the following: 1. Place jumper MODE (JP4) to FIXED FREQ. position. 7. Disconnect input power from VEXT (E2) terminal, because SW1 in AUTO position, supercapacitor C3 starts discharging, however LTC3110 will maintain a voltage of 3.3V on terminal VSYS (E2). 2. Place jumper FBCAP (JP5) to 5.0V position. Place jumper PROG (JP3) to 0.5A position. Place switch DIR (SW1) to AUTO position for automatic switch between charge or backup modes of operation. 8. Repeat steps 1 to 7 for different charging currents and VSYS voltages. While discharging, increase load current to 2.0A to verify high current capability and good load regulation of LTC3110 controller. 3. Place jumper FB (JP1) into 3.2V to set 3.2V voltage on the load, when supercapacitor C3 discharges in backup mode. 9. You can measure voltage regulation and ripple in backup mode on VSYS (E2) terminals. To verify the capability of DC1964A for charging supercapacitors, proceed with the following steps: 4. With power off, connect the input power supply to VEXT, GND load to VSYS, GND as shown on Figure 1. 10.Make sure that input voltage on VEXT and VSYS terminals does not exceed 5.5V. Figure 1. Proper Measurement Equipment Setup 2 dc1964afa DEMO MANUAL DC1964A Quick Start Procedure GND VIN Figure 2. Measuring Input or Output Ripple Figure 3. Charging Mode, VSYS 2.5V, Input Current Set to 0.5A, Ch 4 (Red) Input Current, 200mA/DIV, Ch3 (Blue) VCAP Voltage 95 94 Figure 4. Charging Mode, VSYS 2.5V, Input Current Set to 2.0, Ch 4 (Red) Input Current, 1.0A/DIV, Ch3 (Blue) VCAP Voltage VCAP = 5V VSYS = 3.2V EFFICIENCY (%) 93 92 91 90 89 88 0.25 0.45 0.65 0.85 1.05 1.25 1.45 1.65 LOAD (A) 1.85 dc1964aa F05 Figure 5. Efficiency vs Load, Backup Mode dc1964afa 3 DEMO MANUAL DC1964A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C2 CAP., X5R, 47µF, 6.3V, 10%, 1210 AVX, 12106D476KAT2A 2 1 C3 SUPERCAP, 1.2F, 5.5V, 39mm x 17mm CAP-XX, HS230F 3 1 C4 CAP., X5R, 1µF, 25V, 10%, 0603 AVX, 06033D105KAT2A 4 1 C11 CAP., X5R, 10µF, 10V, 20%, 0603 AVX, 0603ZD106MAT2A 5 4 C6, C9, C15, R2 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A 6 1 C11 CAP., X5R, 10µF, 10V, 20%, 0603 AVX, 0603ZD106MAT2A 7 1 C13 CAP., X5R, 470pF, 25V, 10%, 0603 AVX, 06033D471KAT2A 8 1 D1 DIODE, SCHOTTKY 2A 30V SOD-123FL ON SEMI., MBR230LSFT1G 9 1 D2 DIODE, SW DUAL 75V 200MW SC70-3 DIODE, BAV70W-7-F 10 1 L1 POWER INDUCTOR, 2.2uH COILCRAFT, XAL5030-222MEB 11 1 R1 RES., CHIP, 24, 1%, 0603 VISHAY, CRCW060324R0FKEA 12 1 R3 RES., CHIP, 634k, 1%, 0603 VISHAY, CRCW0603634KFKEA 13 1 R4 RES., CHIP, 576k, 1%, 0603 VISHAY, CRCW0603576KFKEA 14 1 R5 RES., CHIP, 1.02M, 1%, 0603 VISHAY, CRCW06031M02FKEA 15 2 R7, R8 RES., CHIP, 6.04k, 1%, 0603 YAGEO, RC0603FR-076K04L 16 1 R9 RES., CHIP, 200k, 1%, 0603 VISHAY, CRCW0603200KFKEA 17 1 R10 RES., CHIP, 1.91M, 1%, 0603 VISHAY, CRCW06031M91FKEA 18 1 R12 RES., CHIP, 280k, 1%, 0603 VISHAY, CRCW0603280KFKEA 19 1 R13 RES., CHIP, 2k, 1%, 0603 VISHAY, CRCW06032K00FKEA 20 1 R14 RES., CHIP, 1.5M, 1%, 0603 VISHAY, CRCW06031M50FKEA 21 1 R15 RES., CHIP, 845k, 1%, 0603 VISHAY, CRCW0603845KFKEA 22 2 R16, R17 RES., CHIP, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA 23 1 R18 RES., CHIP, 931k, 1%, 0603 VISHAY, CRCW0603931KFKEA 24 1 R19, R20 RES., CHIP, 1M, 1%, 0603 VISHAY, CRCW06031M00FKEA 25 1 R22 RES., CHIP, 1K, 1%, 0603 VISHAY, CRCW06031K00FKEA 26 1 U1 IC., LTC3110EUF, QFN 4mm × 4mm LINEAR TECH., LTC3110EUF#PBF Additional Demo Board Circuit Components 1 C1, C5, C8, C10, C14, C16, C17 OPT 2 R6, R11, R21 OPT Hardware: For Demo Board Only 4 1 1 JP3 HEADER, 0.079 SINGLE ROW 5 PIN SULLINS, NRPN051PAEN-RC 2 4 JP1, JP2, JP5, JP6 HEADER, 0.079 SINGLE ROW 3 PIN SULLINS, NRPN031PAEN-RC 3 5 JP1, JP2, JP3, JP5, JP6 SHUNT SAMTEC, 2SN-BK-G 4 13 E1-E6, E8-E14 TESTPOINT, TURRET, .095" MILL-MAX, 2501-2-00-80-00-00-07-0 5 1 SW1 SWITCH, TOGGLE SPDT ULTMINI PC TH LT 5/08/12 C & K, GT11MCBETR dc1964afa 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. A B C D GND EXT.DIR CHRGB JP1 FB 3.2V 1.8V E4 E2 E14 E10 R11 OPT R4 576K 2 1.8V - 5.25V VSYS E1 100uF 6.3V OPT 7343 + C17 5 R12 280K R9 200K C15 0.1uF C2 47uF 1210 R21 OPT R20 1 Meg 3 EXT.DIR AUTO DIR SW1 2 4 8 6 7 11 10 12 C13 470pF OPT R16 100K 4 2 JP3 PROG 2A 1A R1 24 C10 OPT C4 1uF 9 DIR CHRGB FB PROG RSEN VSYS VSYS SVSYS LTC3110EUF 2. * R2 IS OPTIONAL. 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. 4 U1 L1 2.2uH XAL5030-222ME NOTES: UNLESS OTHERWISE SPECIFIED C14 OPT R18 931K R13 2.0K R8 6.04K R7 6.04K 0.5A VSYS C1 22uF OPT 1210 MBR230LSFT R5 R6 1.02Meg OPT 100uF 6.3V OPT 7343 + C16 VSYS 1 17 SW1 D1 4 13 VEXT 3 1 14 VCAP VCAP VMID RUN CMPIN CMPOUTB CAPOK MODE FBVCAP SW2 2 1 5 3 1 2 1 Meg FIXED FREQ. BURST JP4 MODE C6 0.1uF OFF ON JP2 RUN 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE R19 R17 1 Meg C11 10uF 0.1uF 2 D2 BAV70W 2 R22 1K 1 R14 1.5Meg R10 1.91Meg 2 SCALE = NONE 2 2 VICTOR K. HZ APPROVALS R2* 0.1uF R3 634K LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 23 22 24 2 20 19 21 C9 5 1 3 3 18 SW1 SGND 3 GND 15 GND 16 1 3 3 BAL V+ 2 C5 5F OPT E6 E5 CMPOUTB CAPOK GND GND GND VMID GND 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E13 E12 E11 E9 E8 TECHNOLOGY + C8 5F OPT DATE 4-29-15 LTC3110EUF DEMO CIRCUIT 1964A Wednesday, April 29, 2015 IC NO. 1 SHEET 1 2 OF 1 REV. 2A, BIDIRECTIONAL BUCK-BOOST DC / DC REGULATOR AND CHARGER / BALANCER DATE: N/A SIZE TITLE: SCHEMATIC R15 845K 2.5V 5.0V + VCAP MAX. 5.5V VICTOR K. E3 APPROVED PRODUCTION 2 1 DESCRIPTION REVISION HISTORY REV C3 HS230F 1.2F 5.5V ECO JP5 FBVCAP 1 SW2 GND 25 3 1 3 1 5 A B C D DEMO MANUAL DC1964A Schematic Diagram dc1964afa 5 DEMO MANUAL DC1964A 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 6 dc1964afa Linear Technology Corporation LT 0615 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013