DEMO MANUAL DC1923A LTC3129-1 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3µA Quiescent Current Description Demonstration circuit 1923A features the LTC3129-1, a high efficiency 200mA buck-boost DC/DC converter with a wide VIN and VOUT range. Once the converter is started the LTC3129-1 can operate with VIN as low as 1.92V provided VCC is back-fed. Consult the data sheet for more information on these options. The DC1923A 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 LTC3129-1 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 LTC3129-1 also features fixed output voltages with eight user-selectable settings (JP4, JP5, JP6). This allows the user to eliminate the output voltage divider and the associated bias current. The DC1923A demo board also incorporates a connector (J1) which can be used to connect to a Dust Networks® mote demo board. The DC1923A operates with a 2.42V to 15V input voltage range, and has been designed with the output voltage set to 5V. The demo board can be programmed to any of the eight voltage settings by using jumpers JP4, JP5, and JP6. Performance Summary Figure 1 shows typical demo board efficiency and Figure 2 shows typical step response. The LTC3129-1 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, Linear Technology, the Linear logo, Burst Mode, Dust Networks and Dust are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETER Input Voltage Range VOUT IOUT (see Note 1) Efficiency TYPICAL 2.42V to 15V 5V; 8 User Selectable Voltages 200mA, for VIN > VOUT See Figure 1 Note 1: The demo board output current is a function of VIN. Please refer to the data sheet for more information. dc1923af 1 DEMO MANUAL DC1923A Description DC1923A Efficiency vs Load, VOUT = 5V 100 AutoBURST 90 EFFICIENCY (%) 80 70 60 50 40 30 PWM VIN = 3V VIN = 5V VIN = 10V VIN = 15V 20 10 0 0.01 0.1 1 10 LOAD (mA) 100 1000 Figure 1. DC1923A Efficiency Figure 2. DC1923A 50mA to 100mA Output Step Response 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. 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. 1. Jumper, PS1 and LOAD settings to start: PS1: OFF JP1: RUN ON JP2: MPPC OFF JP3: PWM BURST MODE JP7: DUST PWR NC To set VOUT = 5V JP4: VS1 VCC JP5: VS2 VCC JP6: VS3 GND dc1923af 2 DEMO MANUAL DC1923A Quick Start Procedure 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. 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. 4. Turn on PS1 and slowly increase voltage until the voltage at VIN is 4V. 14.Consult the data sheet for more information on maximum power point control (MPPC) operation. 5. Verify VOUT is ~5V. For USE with a DUST Networks MOTE demo board: 6. VIN can now be varied between 2.42V and 15V. VOUT should remain in regulation. 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 DC1923A demo board can be configured for different VOUT voltages by simply changing jumpers JP4, JP5 and JP6. To configure the board for 3.3V set the jumpers as follows: 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. 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. 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). For USE with a Solar Cells/MPPC: 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 R6 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. JP4: VS1 VCC JP5: VS2 GND JP6: VS3 GND 16.Once the output voltage has been set to the proper voltage and with the power supply OFF connect DC1923A to the Dust Networks mote demo board using J1. See Figures 5 and 6 for the proper connections and orientation. Move jumper JP7 to VOUT. 17.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. dc1923af 3 DEMO MANUAL DC1923A Quick Start Procedure Figure 3. Proper Measurement Equipment Setup GND VIN Figure 4. Measuring Input or Output Ripple Figure 5. DC1923A Connected to DC9003A Dust Mote (Top View) dc1923af 4 DEMO MANUAL DC1923A Quick Start Procedure Figure 6. DC1923A Connected to DC9003A Dust Mote (Bottom View) 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 1µF 25V X5R 0603 TDK, C1608X5R1E105M 3 1 C3 CAP CER 10µF 25V X5R 1210 TDK, C3225X5R1E106M 4 2 C5, C6 CAP CER 22000pF 50V X7R 10% 0603 TDK, C1608X7R1H223K 5 1 C9 CAP CER 2.2µF 10V X7R 20% 0603 TDK, C1608X7R1A225M 6 1 C10 CAP CER 10pF 50V NP0 ±0.25pF 0603 TDK, C1608C0G1H100C 7 1 L1 INDUCTOR, 10µH COILCRAFT, EPL3015-103 8 1 Q1 N-CHANNEL MOSFET, 20V, SOT23 DIODES/ZETEX, ZXMN2F30FHTA 9 3 R1, R2, R4 RES, CHIP, 2M, 1/16W, 1%, 0402 VISHAY, CRCW04022M00FKED 10 1 U1 15V, 200mA SYNCHRONOUS BUCK-BOOST DC/DC CONVERTER WITH 1.3µA QUIESCENT CURRENT LINEAR TECHNOLOGY, LTC3129EUD-1 CAP CER 0603 OPT Additional Demo Board Circuit Components 1 0 C7 (OPT) 2 0 C8 (OPT) CAP TANT 68µF 20V 10% SMD 7343 OPT 3 0 R3, R5, R6 (OPT) RES 1/10W 1% 0402 SMD OPT Hardware: For Demo Board Only 1 5 E1, E2, E3, E4, E5 TESTPOINT, TURRET 0.094" MILLMAX 2501-2-00-80-00-00-07-0 2 1 J1 HEADER, 2X6, 12-PIN, SMT HORIZONTAL SOCKET w/KEY, 0.100" SAMTEC, SMH-106-02-L-D-05 3 7 JP1-JP7 JMP, 0.079" SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S 4 7 XJP1-XPJP7 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 5 4 (STAND-OFFS) STAND-OFF, NYLON 0.625" TALL KEYSTONE, 8834(SNAP ON) dc1923af 5 A B C D ON JP1 E2 JP2 JP3 VCC PWM R6 OPT R3 OPT C8 OPT 7343 MPPC R4 2M R2 2M PWM VIN VIN + VIN C7 OPT 6.3V R5 OPT C10 10pF RUN C1 22uF 25V 1210 C2 1uF 25V 5 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0603. NOTE: UNLESS OTHERWISE SPECIFIED BURST MODE FIXED FREQ VCC ON OFF MPPC OFF RUN GND VIN 2.4V - 15V E1 VCC VS1 VCC GND JP5 VS2 VS2 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE JP4 VS1 3 MPPC RUN VIN U1 LTC3129EUD-1 VCC VCC 5 4 2 C5 22nF 50V L1 EPL3015 -103 3 13 JP6 SCALE = NONE J.NOON NC APPROVALS VCC GND 9 8 7 10 11 12 VS3 VS1 VS2 VS3 PWM PGOOD VOUT C6 22nF 50V 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. VCC GND C9 2.2uF MPPC RUN 4 1 BST1 16 SW1 GND 6 GND 17 14 SW2 15 BST2 6 PGND 5 DESCRIPTION R1 2M GND C3 10uF 25V 1210 C4 1uF 25V GND VCC GND GND GND VCC GND GND GND GND VCC VCC VCC VCC VCC TECHNOLOGY VCC GND DATE GND PGOOD 15V 8.2V 12V 6.9V 5.0V 3.3V 4.1V 2.5V LTC3129 - 1 VOUT E4 E5 5.0V / 200mA VIN > VOUT * VOUT 01 - 02 - 13 2 DATE: 01 - 02 - 13 1 1 OF 1 15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER WITH 1.3uA QUIESCENT CURRENT IC NO. REV. SIZE LTC3129EUD-1 N/A 2 DEMO CIRCUIT 1923A SHEET 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 GND VCC VCC VCC JP4 / VS1 JP5 / VS2 E3 J.NOON VOUT GND 1 APPROVED * VOUT JUMPER CONFIGURATION VOUT PRODUCTION FAB REVISION HISTORY JP6 / VS3 TITLE: SCHEMATIC VS3 VS1 VS2 VS3 PWM 2 - PGOOD REV ECO 2 A B C D DEMO MANUAL DC1923A Schematic Diagram dc1923af 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 5 1 JP7 4 NC SCALE = NONE J.NOON Figure 7. Circuit Schematic 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. PGOOD APPROVALS SMH-106-02-L-D-05 2 VSUPPLY NC 4 GND PGOOD 6 KEY VBAT 8 RSVD EHORBAT 10 I/O 2 I/O 1 12 +5V V+ CUSTOMER NOTICE Q1 ZXMN2F30FH 1 3 5 7 9 11 J1 CAUTION: ONLY CONNECT IF VOUT IS CONFIGURED FOR 3.3V 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. PGOOD NC DUST PWR VOUT VOUT 4 3 2 D 5 GND PGOOD VOUT TECHNOLOGY SHEET 2 OF 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only PGOOD VOUT 1 2 DATE: 01 -02 - 13 1 15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER WITH 1.3uA QUIESCENT CURRENT IC NO. REV. SIZE LTC3129EUD-1 N/A 2 DEMO CIRCUIT 1923A TITLE: SCHEMATIC 2 A B C D DEMO MANUAL DC1923A Schematic Diagram dc1923af 7 DEMO MANUAL DC1923A 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 dc1923af 8 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