LT8607 LINER | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 6
Technical content
Description
42V, 0.75A Micropower Synchronous Step-Down Regulator Demonstration Circuit 2565A is a 42V, 0.75A micropower synchronous step-down regulator featuring the LT®8607. The demo board is designed for 5V output from a 5.5V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and indus - trial supplies. The LT8607 is a compact, high efficiency, high speed synchronous monolithic step-down switch - ing regulator that consumes less than 3μA of quiescent current when output is regulated at 5V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8607 to minimize external components and simplify design. The SYNC pin on the demo board is grounded by default for low ripple Burst Mode® operation. Move JP1 to PULSE SKIPPING position can change the operation mode to pulse-skipping operation. Once JP1 is on SPREAD SPEC- TRUM position, V CC is applied to the SYNC pin for low EMI spread spectrum operation. To synchronous to an external clock, move JP1 to SYNC and apply the external clock to the SYNC turret. Figure 1 shows the efficiency of the circuit. L, L T , L TC, L TM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. performance summary The demo board has an EMI filter installed. The radiated EMI performances of the board (with EMI filter) are shown in Figure 2 and Figure 3. The red lines in Figure 2 and Figure 3 are CISPR25 Class 5 peak limit. To use the EMI filter , the input should be tied to VEMI, not VIN. An induc- tor L2, which is a 0Ω jumper on the board by default now, can be added in the EMI filter to further reduce the conducted emission. The LT8607 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2565A. Design files for this circuit board are available at http://www.linear .com/demo/DC2565A Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Voltage Range 5.5 42 V VOUT Output Voltage 4.8 5 5.2 V IOUT Maximum Output Current 0.75 A fSW Switching Frequency 1.85 2 2.15 MHz EFE Efficiency at DC VIN = 12V, IOUT = 0.75A 92.4 %
- Set an input power supply that is capable of 42V /0.75A.
- With power off, connect the supply to the input termi-
- Turn on the power at the input.
- Check for the proper output voltage of 5V
- Once the proper output voltage is established, connect
output terminals VOUT and GND. Set the current for 0A. measure the DC2565A’s output current.
- Turn on the power at the input.
load to make sure that the load is not set too high.
- Once the proper output voltage is established again,
age, efficiency and other desired parameters.
- An external clock can be added to the SYNC termi -
Figure 1. Efficiency vs Load Current at 2MHz Switching Frequency
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C2 CAP ., X7R, 4.7µF, 50V, 10% 1206 MURATA, GRM31CR71H475K 2 1 C4 CAP ., X7R, 0.22µF, 16V, 10%, 0603 MURATA, GRM188R71C224KA01D 3 1 C5 CAP ., C0G, 10pF, 25V, 5%, 0603 AVX, 06033A100JAT2A 4 1 C6 CAP ., X7R, 22µF, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L 5 1 C7 CAP ., X7R, 1.0µF, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D 6 1 C8 CAP ., X7R, 0.01µF, 16V, 10%, 0603 MURATA, GRM188R71C103KA01D 7 1 L1 IND., 3.3µH WURTH ELECTRONICS, 74438336033 8 1 R2 RES., CHIP , 18.2k, 1/10W, 1%, 0603 VISHAY, CRCW060318K2FKEA 9 1 R3 RES., CHIP , 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA 10 2 R1, R4 RES., CHIP , 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA 11 1 R5 RES., CHIP , 187k, 1/10W, 1%, 0603 VISHAY, CRCW0603187KFKEA 12 1 U1 IC, REGULATOR, MSE10 LINEAR TECH., LT8607EMSE#PBF Additional Demo Board Circuit Components 1 1 C1 CAP ., ALUM 22µF 63V SUN ELECT , 63CE22BS 2 2 C3, C10 CAP ., X7R, 4.7µF, 50V, 10% 1206 MURATA, GRM31CR71H475K 3 1 C9 CAP ., X7R, 4.7µF, 16V, 10%, 0805 MURATA, GRM21BR71C475K73L 4 1 C11 CAP ., X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L 5 2 C12, C13 CAP ., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D 6 1 FB1 FERRITE BEAD 0805 TDK, MPZ2012S331AT000 7 1 L2 RES., CHIP , 0Ω, 3/4W, 2010 VISHAY, CRCW20100000Z0EF 8 0 R6 (OPT .) RES., 0603 Hardware: For Demo Board Only 1 9 E1-E9 TESTPOINT , TURRET , 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 E10 (OPT .) TESTPOINT , TURRET , 0.094" 3 1 JP1 DOUBLE ROW HEADER 2 × 4 0.079" WURTH ELECTRONICS, 62000821121 4 1 XJP1 SHUNT , 0.079" CENTER WURTH ELECTRONICS, 60800213421 5 4 MH1-MH4 STAND-OFF , NYLON 0.50" TALL WURTH ELECTRONICS, 702935000
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 D D C C B B A A ALL CAPACITORS ARE 0603. NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603. SUNCON 63CE22BS (2MHz) SYNC SPREAD SPECTRUM PULSE SKIPPING BURST VOUT VCC VCC 18.2k E6EN/UV SYNC GND 3.3µH 74438336033 22µF 63V 1.00M 22µF 10V 1206 TR/SS C11 1µF 50V 0805 0.01µF 0.22µF C10 4.7µF 50V 1206 49.9k PG 1µF (Opt) VOUT 5V /0.75A JP1 1 2 GND 0 2010 1.00M 187k C5 10pF VEMI 5.5V - 42V 4.7µF 50V 1206 C13 0.1µF 50V 4.7µF 50V 1206 FB1 MPZ2012S331AT000 LT8607EMSE VIN9 EN/UV10 SYNC5 VCC3 TR/SS7 RT4 FB 6 PG 8 SW 2 BST 1 GND11 C12 0.1µF 50V 4.7µF 16V 0805 GND E10 VIN 5.5V - 42V
DEMO MANUAL DC2565A LINEAR TECHNOLOGY CORPORATION 2017 LT 0517 • PRINTED IN USA 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