DEMO MANUAL DC1999A LTC3111EDHD 15V, 1.5A Synchronous Buck-Boost DC/DC Converter DESCRIPTION Demonstration circuit 1999A is a fixed frequency synchronous buck-boost converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below, or equal to the output voltage. Typical demo board efficiency is shown in Figure 2 for several loads. The demo board has the provision to set an accurate run threshold. Consult the LTC3111data sheet for more information. The transient response of the converter to a 100mA to 600mA transient at input voltages of 3.5V and 12V are presented in Figures 3 and 4. The LTC®3111 features selectable PWM or Burst Mode® operation, and an easily synchronizable oscillator. Jumper JP1 is provided to enable the converter. The demo board is configured for 800kHz. A jumper, JP2, is provided to select PWM, or Burst Mode operation. A clock signal can also be applied to JP2 if synchronization is desired. The LTC3111 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. The LTC3111 operates with a 2.5V to 15V input voltage range and a VOUT range from 2.5V to 15V. The demonstration board has been designed to operate with VIN from 2.5V to 15V and an output current up to 1.5A. For VIN < 5V, IOUT capability is reduced. VOUT is set to 5.0V. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at TA = 25°C INPUT VOLTAGE RANGE 2.5V to 15V VOUT 5V IOUT 1.5A for VIN > 5V dc1999af 1 DEMO MANUAL DC1999A QUICK START PROCEDURE Using short twisted-pair leads for any power connections and with all loads and power supplies off, refer to Figure 1 for the proper measurement and equipment setup. The power supply 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. 1.JP1, JP2 and Load Settings to start: JP1 (RUN) = OFF JP2 (PWM) = 800kHz (Fixed Frequency) LOAD = 0.1A/50Ω 10W Resistor 2.With power OFF connect the power supply as shown in Figure 1. If accurate current measurements are desired (for efficiency calculations for example) then connect an ammeter in series with the supply as shown. The ammeter is not required however. 3.Connect the load to VOUT as shown in Figure 1. Again, connect an ammeter if accurate current measurement or monitoring is desired. 4.Turn on the power supply and slowly increase voltage until the voltage at VIN is 2.5V. Move Jumper JP1 to ON. 5.Verify VOUT is ~5.0V. 6.VIN can now be varied between 2.5V and 15.0V. VOUT should remain in regulation. 7.IOUT can also be varied from 0A to 1.5A. For VIN < 5.0V, maximum IOUT is reduced. This reduction is due to IIN increasing as VIN decreases. Once the input current limit is reached, VOUT will fall out of regulation. Note: If VOUT drops out of regulation, check to be sure the maximum load has not been exceeded, or that VIN is not below the minimum value (2.5V). Figure 1. Measurement Setup dc1999af 2 DEMO MANUAL DC1999A QUICK START PROCEDURE Figure 2. Typical Efficiency as a Function of Input Voltage and Load Current Figure 3. Typical Transient Load Response for a 100mA to 600mA Transient Load VIN = 3.5V Figure 4. Typical Transient Load Response for a 100mA to 600mA Transient Load VIN = 12V dc1999af 3 DEMO MANUAL DC1999A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C2 CAP CER 47µF 16V 20% X5R 1210 MURATA, GRM32ER61C476ME15L 2 3 C3, C10, C12 CAP CER 1µF 16V 10% X5R 0603 MURATA, GRM188R61C105KA93D 3 2 C4, C5 CAP CER 0.1µF 16V 10% X7R 0402 MURATA, GRM155R71C104KA88D 4 1 C6 CAP CER 22pF 50V 1% NP0 0402 MURATA, GJM1555C1H220FB01D 5 1 C7 CAP CER 1500pF 16V 10% 0402 AVX, 0402YC152KAT2A 6 1 C8 CAP CER 47pF 50V 5% NP0 0402 MURATA, GRM1555C1H470JZ01D 7 1 C9 CAP CER 100µF 16V 20% X5R 1210 TAIYO YUDEN, EMK325ABJ107MM-T 8 1 C11 CAP CER 100pF 50V 5% NP0 0402 MURATA, GRM1555C1H101JA01D 9 1 L1 INDUCTOR, 10µH COILCRAFT, XAL5050-103M 10 1 R1 RES 845k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF8453X 11 1 R2 RES 158k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF1583X 12 1 R3 RES 11.5k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF1152X 13 1 R4 RES 41.2k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF4122X 14 1 R5 RES 1.00M 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF1004X 15 1 R6 RES 0402 SMD (DNP) 16 1 R7 RES 49.9Ω 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF49R9X 17 1 U1 15V, 1.5A SYNCHRONOUS BUCK-BOOST DC/DC CONVERTER LINEAR TECH., LTC3111EDE #PBF Additional Demo Board Circuit Components 1 0 C1 (OPT) CAP, TANT LOW ESR 47µF 35V 20% SMD AVX, TPSE476M035R0200 Hardware-For Demo Board Only 1 5 E1-E5 TURRET, 0.09 DIA MILL-MAX, 2501-2-00-80-00-00-07-0 3 2 JP1, JP2 JMP, 3-PIN 1 ROW 0.079CC SAMTEC, TMM-103-02-L-S 4 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 5 4 STAND OFF STAND-OFF, NYLON 0.375" TALL KEYSTONE, 8832 (SNAP ON) dc1999af 4 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. 1 2 3 4 + ON RUN OFF A 2. INSTALL SHUNTS AS SHOWN. 1 2 3 R5 1M 1% R6 DNP RUN C12 1uF 0603 U1 10uH RUN PWM/SYNC VCC SNSGND VIN BST1 SW1 LTC3111EDE 4 13 12 3 C11 100pF RUN PWM/SYNC VCC 5 7 6 CUSTOMER NOTICE VIN C3 1uF 0603 C4 0.1uF L1 B THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C JP2 C SCALE = NONE JB NC APPROVALS BURST PWM 14 11 2 1 10 8 9 800kHz OSC SYNC SGND NC FB COMP VOUT BST2 SW2 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. JP1 RUN C2 47uF 16V 1210 1. ALL RESISTORS ARE IN OHMS, 0402. NOTE: UNLESS OTHERWISE SPECIFIED GND E3 C1 OPT TANT VIN 2.5V - 15.0V VIN B GND 15 E1 A 1 2 3 PWM/SYNC 41.2K R4 R7 49.9 1% R3 11.5K R2 158K 1% R1 845k 1% C9 100uF 1210 16V E E5 E4 GND GND C10 1uF 0603 Vin > 5.0 V VOUT 5.0V / 1.5A E2 DATE: N/A SIZE 2 - 6 - 14 IC NO. D LTC3111EDE DEMO CIRCUIT 1999A E SHEET 1 OF 3 1 REV. 15V, 1.5A SYNCHRONOUS BUCK-BOOST DC / DC CONVERTER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C8 47pF TECHNOLOGY 1500pF C7 C6 22pF TITLE: SCHEMATIC VCC VOUT C5 0.1uF D 1 2 3 4 DEMO MANUAL DC1999A SCHEMATIC DIAGRAM dc1999af 5 DEMO MANUAL DC1999A 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 dc1999af 6 Linear Technology Corporation LT 0214 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014