LT8714

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Description

Demonstration circuit 2240A is a synchronous four- quadrant converter featuring the LT ®8714 switching controller. The LT8714 can regulate to positive, negative, or zero volts when configured as a four-quadrant topol - ogy. The DC2240 A r egulates from a 10V to 14V input source to an adjustable output voltage from positive 5V to negative 5V with a 5A maximum current rating , and operates at 200kHz switching frequency . The LT8714 incorporates a power good feature to let the user know if the output voltage is within its target regulation voltage. The LT8714 has an output voltage control ( CTRL) pin which sets the output voltage . The DC2240A has a L, L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. performance summary jumper to select the CTRL pin voltage source from either externally (EXT) or internally (INT). If selected internally, the output voltage can be set to + 5V or –5V. If selected externally, the output voltage can vary between positive 5V and negative 5V , following a 0. 1V – 1V CTRL signal with high bandwidth. The LT8714 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2240A. Design files for this circuit board are available at http://www.linear.com/8714 Specifications are at TA = 25°C Figure 1. DC2240A Connection Diagram

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 CIN1, CIN2, CIN3, CIN4 CAP., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L 2 6 C1, C2, C3, C4, C20, C21 CAP., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L 3 2 CO1, CO2 CAP., X5R, 100µF, 10V, 20%, 1210 MURATA, GRM32ER61A107ME20K 4 3 C7, C8, C9 CAP., X7R, 2.2µF, 25V, 10%, 0805 MURATA, GRM21BR71E225KA73L 5 1 C10 CAP., X7R, 0.68µF, 25V, 10%, 0603 TDK, C1608X7R1E684K080AB 6 1 C11 CAP., X7R, 0.068µF, 25V, 10%, 0603 MURATA, GRM188R71E683KA01D 7 1 C12 CAP., X7R, 0.01µF, 25V, 10%, 0603 MURATA, GRM188R71E103KA01D 8 1 C13 CAP., X7R, 100pF, 25V, 10%, 0603 AVX, 06033C101KAT2A 9 1 C15 CAP., X7R, 0.1µF, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D 10 1 L1 INDUCTOR, 15µH Coilcraft, XAL1510-153 11 1 L2 INDUCTOR, 15µH Coilcraft, XAL1010-153 12 1 MN1 N-CH FET, PG-TDSON-8 INFINEON, BSC034N06NS 13 1 MP1 P-CH FET, DPAK FAIRCHILD, FDD4141 14 1 R1 RES., SENSE, 7 mΩ, 1%, RL3720W SUSUMU, RL3720WT-R007-F 15 1 R2 RES., SENSE, 2 mΩ, 1%, RL3720W SUSUMU, RL3720WT-R002-F 16 6 R3, R4, R5, R6, R9, R10 RES., 0Ω, 0.1W, 1%, 0603 VISHAY, CRCW06030000Z0EA 1 R7 RES., 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA 18 1 R8 RES., 57.6k, 1/10W, 1%, 0603 VISHAY, CRCW060357K6FKEA 19 1 R16 RES., 6.98k, 1/10W, 1%, 0603 VISHAY, CRCW06036K98FKEA 20 1 R19 RES., 18.7k, 1/10W, 1%, 0603 VISHAY, CRCW060318K7FKEA 21 3 R12, R15, R18 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA 22 1 R13 RES., 73.2k, 1/10W, 1%, 0603 VISHAY, CRCW060373K2FKEA 23 1 R14 RES., 100, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA 24 1 R17 RES., 178k, 1/10W, 1%, 0603 VISHAY, CRCW0603178KFKEA 25 1 R19 RES., 18.7k, 1/10W, 1%, 0603 VISHAY, CRCW060318K7FKEA 26 1 R20 RES., 1Ω, 1/4W, 1%, 1206 VISHAY, CRCW12061R00FKEA 27 1 R22 RES., 1.78k, 1/10W, 1%, 0603 VISHAY, CRCW06031K78FKEA 28 1 U1 I.C., VOLTAGE REGULATOR, 20TSSOP LINEAR TECHNOLOGY, LT8714EFE#PBF 29 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2240A Additional Demo Board Circuit Components 1 0 CO3, CO4 (OPT ) CAP., OPTION, 1210 2 0 C5, C6, C16, C17 (OPT) CAP., OPTION, 0603 3 0 C18 (OPT) CAP., OPTION, 0805 4 0 VR1 (OPT) TRIMMER, OPT 5 0 R21 (OPT) RES., OPT, 0603 6 0 MN2 (OPT) N-CH FET, OPTION, DPAK 7 0 MP2 (OPT ) P-CH FET, OPTION, PG-TDSON-8 Hardware: For Demo Board Only 1 13 E1-E13 TESTPOINT, TURRET, .094" PbF MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 HEADER 3 PIN 0.079 SINGLE ROW WUR TH ELEKTRONIK, 620 003 111 21 3 1 JP2 HEADER 3 PIN 0.079 DOUBLE ROW WURTH ELEKTRONIK, 620 006 211 21 4 2 XJP1, XJP2 SHUNT, 0.079" CENTER WURTH ELEKTRONIK, 608 002 134 21 5 4 MH1-MH4 STAND-OFF, NYLON 0.50" KEYSTONE, 8833 (SNAP ON)

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic Diagram E E D D C C B B A A D D C C B B A A 1. ALL RESISTORS AND CAPACITORS 0603. NOTE: UNLESS OTHERWISE SPECIFIED. EN NG EN INTVCC SYNC IMON ISN ISP TG VIN PGTG ISP ISN SYNC IMON VOUT INTVCC NG PG VIN C12 10nF 22uF 1210 25V R18 100k C11 68nF R19 18.7k 0603 E10 SYNC VOUT ±5V / 5A CO1 100µF 10V 1210 CIN3 22µF 25V 1210 E13 VCTRL 0.1V - 1V C20 C18 OPT 0805 CO4 OPT MP2 OPT PG-TDSON-8 OPT C15 100nF R21 OPT 0603 C17 OPT R20 1206 2.2µF 0805 R13 73.2k 1% C21 2.2µF 0805 R22 1.78k 0603 XAL1510-153 15uH CO3 OPT JP1 INT EXT 1 C16 OPT VIN 10V - 14V CIN1 22µF 25V 1210 C10 680nF MP1 FDD4141 R15 100k 0603 R14 100 0.002 RL3720W R10 EN R16 6.98k CIN2 22µF 25V 1210 E12 AGND JP2 +5V -5V OPT 1 2 5 6 C13 100pF 0.007 RL3720W 22uF 1210 25V PGND LT8714EFE ISN 6 ISP 7 TG 10BG11 CSP CSN VIN13 EN16 CTRL 17 SYNC19 BIAS 8 INTVEE 9 PG4 FB 1 VC 2IMON5 GND GND RT18 SS3 INTVCC12 OPT 10k 2.2µF 0805 MN1 BSC034N06NS 57.6k XAL1010-153 15uH OPT VR1 PGND CIN4 22µF 25V 1210 CO2 100µF 10V 1210 C4 22uF 25V 1210 MN2 OPT DPAK R17 178k R12 100k E11 IMON

DEMO MANUAL DC2240A Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com  LINEAR TECHNOLOGY CORPORATION 2015 LT 1015 • PRINTED IN USA DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LT C) 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 ONL Y and is not provided by L TC 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 L TC 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. L TC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. L TC 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 L TC applica- tion engineer . Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation