DEMO MANUAL DC1922A LTC3129 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3µA Quiescent Current Description Demonstration Circuit 1922A features the LTC®3129, a high efficiency 200mA buck-boost DC/DC converter with a wide VIN and VOUT range. output applications, or to allow operation with VIN down to 1.92V. Consult the data sheet for more information on these options. The DC1922A demo board has two user selectable operating modes: Burst Mode® Operation and Fixed Frequency PWM (JP3). There is also an accurate programmable RUN pin which is used to ENABLE the converter (JP1). The LTC3129 also incorporates a maximum power point control function which can be enabled (JP2) for applications where the input source is a solar cell or is high impedance, such as intrinsically safe applications or high ZOUT thermal electric generators (TEGs). The DC1922A demo board also incorporates a connector (J1) which can be used to connect to a Dust Networks Mote demo board. The DC1922A operates with a 2.42V to 15V input voltage range, and has been designed with the output voltage set to 5.0V. Once the converter is started the LTC3129 can operate with VIN as low as 1.92V provided VCC is backfed. The demo board has optional provisions to backfeed VCC (D1) in order to increase efficiency in some 5V Performance Summary Figure 1 shows typical demo board efficiency and Figure 2 shows typical step response. The LTC3129 data sheet has detailed information about the operation, specification, 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 L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETER VALUE Input Voltage Range 2.42V to 15V VOUT 5.0V IOUT (See Note 1) 200mA, for VIN > VOUT Efficiency See Figure 1 NOTE 1: The demo board output current is a function of VIN. Please refer to the data sheet for more information. dc1922af 1 DEMO MANUAL DC1922A description DC1922A Efficiency vs Load, VOUT = 5V 100 (AUTOBURST) EFFICIENCY (%) 80 60 (PWM) VIN = 3V VIN = 5V VIN = 10V VIN = 15V VIN = 3V VIN = 5V VIN = 10V VIN = 15V 40 20 0 0.01 0.1 1 10 LOAD (mA) 100 1000 dc1922a F01 Figure 1. DC1922A Efficiency in AUTOBURST MODE Figure 2. DC1922A Step Response 2 dc1922af DEMO MANUAL DC1922A Quick Start Procedure Using short twisted pair leads for any power connections and with all loads and power supplies off, refer to Figure 3 for the proper measurement and equipment setup. The power supply (PS1) should not be connected to the circuit until told to do so in the procedure below. 7. Load current (IOUT) can also be varied. The maximum IOUT is a function of VIN and the current limit. Consult the data sheet for more information on IOUT vs VIN. In general for VIN > VOUT IOUT can be increased to 200mA. For VIN < VOUT IOUT capability will be reduced. 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 4), or by using an oscilloscope probe tip jack. 8. For operation in fixed frequency (PWM) mode move Jumper JP3 to FIXED FREQ. See the data sheet for more information on Burst Mode operation. 1. Jumper, PS1 and LOAD settings to start: For USE with a Solar Cells/MPPC: PS1 = OFF JP1 (RUN) = ON JP2 (MPPC) = OFF JP3 (PWM) = BURST MODE OPERATION JP4 (DUST PWR) = NC 2. With power OFF connect the power supply (PS1) as shown in Figure 3. If accurate current measurements are desired (for efficiency calculations for example) then connect an ammeter (AM1) in series with the supply as shown. The ammeter is not required however. 3. Connect a 50mA load to VOUT as shown in Figure 3 (100Ω for VOUT = 5V). Connect an ammeter (AM2) if accurate current measurement or monitoring is desired. 4. Turn on PS1 and slowly increase voltage until the voltage at VIN is 4.0V. 5. Verify VOUT is ~5.0V. 6. VIN can now be varied between 2.42V and 15.0V. VOUT should remain in regulation. 9. NOTE: If VOUT drops out of regulation, check to be sure that VIN is not below the minimum value for regulation (see data sheet). 10. With power OFF move jumper MPPC (JP2) to ON. 11. If using a power supply as the source, place a minimum of 10Ω, 10W resistor in series with the input to simulate the source resistance. If using a solar cell (s) or high impedance source, no additional resistance should be needed. 12. Set resistor R9 to a value which will set the MPPC pin to the desired voltage. See the data sheet section “Programming the MPPC Voltage” for more information. 13. With no load and the MPPC voltage set, increase the source voltage above the MPPC set point. VOUT should be in regulation. As the load is increased VIN will drop until it reaches the MPPC set voltage. As the load is increased further, VOUT will drop out of regulation, but VIN will be regulated to the set point voltage. This is to prevent the input source from collapsing and to allow the maximum power to be extracted from the source. 14. Consult the data sheet for more information on maximum power point control (MPPC) operation. dc1922af 3 DEMO MANUAL DC1922A Quick Start Procedure For USE with a DUST Networks MOTE demo board: 15. Connector J1 is designed to interface with a Dust Networks Mote demo board. Consult the Dust documentation for optimal VOUT regulation setting. In general the Dust Networks Mote will operate with VOUT set to 3.3V. However, care should be taken to not overvoltage the Mote. Newer Motes may require a different VOUT. The DC1922A demo board can be configured for different VOUT voltages by simply changing R2. 17. Once the output voltage has been set to the proper voltage and with the power supply OFF connect DC1922A to the Dust Networks Mote demo board using J1. See Figure 5 and 6 for the proper connections and orientation. Move jumper JP4 to VOUT. 18. Once the boards have been connected, turn on PS1 and increase the voltage to approximately 3V. VOUT should now be in regulation. VIN can now be varied over the operating range and VOUT should remain in regulation. 16. The DC1922A demo board can be configured for VOUT = 3.3V by changing resistor R2 to 1.1M for R1 = 2M. Figure 3. Proper Measurement Equipment Setup GND VIN Figure 4. Measuring Input or Output Ripple 4 dc1922af DEMO MANUAL DC1922A Quick Start Procedure Figure 5. DC1922A Connected to DC9003 Dust Mote (Top View) Figure 6. DC1922A Connected to DC9003 Dust Mote (Bottom View) dc1922af 5 DEMO MANUAL DC1922A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP CER 22µF, 25V, X5R, 20%,1210 TDK, C3225X5R1E226M 2 2 C2, C4 CAP CER 1.0µF, 25V, X5R, 20%, 0603 TDK, C1608X5R1E105M 3 1 C3 CAP CER 22µF, 10V, X5R, 20%, 1210 TDK, C3225X5R1A226M 4 2 C5,C6 CAP CER 22000pF, 50V, X7R, 10%, 0603 TDK, C1608X7R1H223K 5 1 C7 CAP CER 33pF, 50V, 5%, NP0 0603 TDK, C1608C0G1H330J 6 1 C9 CAP CER 2.2µF, 10V, X7R, 20%, 0603 TDK, C1608X7R1A225M 7 1 C10 CAP CER 10pF, 50V, NP0, ±0.25pF 0603 TDK, C1608C0G1H100C 8 1 L1 INDUCTOR, 10µH COILCRAFT, EPL3015-103 9 1 Q1 N-CHANNEL MOSFET, 20V, SOT23 DIODES/ZETEX, ZXMN2F30FHTA 10 4 R1, R4, R5, R6 RES,CHIP, 2.0M, 1/16W, 1%, 0402 VISHAY, CRCW04022M00FKED 11 1 R2 RES, CHIP, 619k, 1/16W,1%, 0402 VISHAY, CRCW0402619KFKED 12 1 R3 RES, CHIP, 2.21k, 1/16W, 1%, 0402 VISHAY, CRCW04022K21FKED 13 1 U1 15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER LINEAR TECHNOLOGY, LTC3129EUD WITH 1.3µA QUIESCENT CURRENT Additional Demo Board Circuit Components 1 0 C8 CAP TANT 68µF, 20V, 10%, SMD 7343 (OPT) OPT 2 0 C11 CAP CER 6.3V, 0603 (OPT) OPT 3 0 D1 DIODE SCHOTTKY (OPT) OPT 4 0 R7, R8, R9 RES 1/10W, 1%, 0402 SMD (OPT) OPT MILLMAX 2501-2-00-80-00-00-07-0 Hardware: For Demo Board Only 1 5 E1, E2, E3, E4, E5 TESTPOINT, TURRET 0.094" 2 1 J1 HEADER, 2 × 6, 12-PIN, SMT HORIZONTAL SOCKET W/KEY, 0.100" SAMTEC, SMH-106-02-L-D-05 3 4 JP1, JP2, JP3, JP4 JMP, 0.079 SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S 4 4 XJP1, XJP2, XJP3, XJP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 5 4 (STAND-OFFS) STAND-OFF, NYLON 0.625" Tall KEYSTONE, 8834(SNAP ON) 6 dc1922af 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 JP1 RUN VIN R8 OPT R5 2M OPT 7343 + C8 VIN RUN C10 10pF VOUT C1 22uF 25V 1210 ON VCC 5 JP2 MPPC OFF OPT D1 C2 1uF 25V 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0603. NOTE: UNLESS OTHERWISE SPECIFIED ON OFF GND E2 2.4V - 15V VIN E1 R9 OPT C11 OPT 6.3V R7 OPT BURST MODE 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE J.NOON NC APPROVALS JP3 9 8 10 11 7 12 VCC PWM NC NC PWM PGOOD FB VOUT C6 22nF 50V PWM FIXED FREQ CUSTOMER NOTICE MPPC R6 2M VCC MPPC RUN U1 LTC3129EUD VCC 3 5 4 VIN 3 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. VIN C9 2.2uF MPPC RUN 2 C5 22nF 50V 1 BST1 16 SW1 GND 6 L1 EPL3015-103 GND 17 13 BST2 14 SW2 PGND 15 4 R2 619k 1% R1 2M 1% PGOOD NC 1 PGOOD C4 1uF 25V 1 3 5 7 9 11 2 4 6 8 10 12 E4 E5 PGOOD GND PGOOD DATE: 2 01 - 02 - 13 1 1 OF 1 15V, 200mA, SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER WITH 1.3uA QUIESCENT CURRENT SIZE IC NO. REV. LTC3129EUD N/A 2 DEMO CIRCUIT 1922A SHEET 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only SMH-106-02-L-D-05 NC VSUPPLY GND PGOOD KEY VBAT EHORBAT RSVD I/O 2 I/O 1 V+ +5V J1 CAUTION: ONLY CONNECT IF VOUT IS CONFIGURED FOR 3.3V ZXMN2F30FH Q1 VOUT R4 2M C3 22uF 10V 1210 DATE 01 - 02 - 13 VOUT 5.0V / 200mA VIN > VOUT E3 J.NOON VOUT APPROVED DESCRIPTION 1 PRODUCTION FAB REVISION HISTORY TECHNOLOGY JP4 DUST PWR VOUT R3 2.21K TITLE: SCHEMATIC PWM 2 - C7 33pF REV ECO 2 3 2 5 A B C D DEMO MANUAL DC1922A Schematic Diagram dc1922af 7 DEMO MANUAL DC1922A 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 8 dc1922af Linear Technology Corporation LT 0513 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013