DEMO MANUAL DC1819A LTC4415EMSE Dual 4A Ideal Diodes with Adjustable Current Limit DESCRIPTION Demonstration circuit 1819A features the LTC®4415EMSE dual ideal diodes. Each independent ideal diode can be used to replace a standard diode for improved low forward drop in applications requiring maximum headroom and overall system efficiency. EN1 and EN2. As initially configured, by setting to BOTH the user can apply input voltages and loads on each diode independently. Selecting PRIORITY allows the LTC4415 to automatically switch over between inputs when the proper input voltage threshold on IN1 is achieved. The input supply voltage ranges are from 1.7V to 5.5V for each input/output pair. As initially configured, LTC4415 can provide a maximum current limit of 4A for each diode, but is jumper-selectable up to 6A (internal current limit). The voltage of the current limit pins, CLIM1 and CLIM2, can also be monitored for a scaled representation of the output current. Status and warning LEDs and test points are provided for the logic output pins STAT1, STAT2 and WARN1, WARN2, respectively. For evaluation, each diode can be controlled by the ENABLE CONTROL jumper, JP1, or by the enable input pins, PERFORMANCE SUMMARY Optionally, the LTC4415EDHC version can also be used for evaluation. It is a pin-compatible drop-in replacement. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C) PARAMETER CONDITIONS VALUE Minimum Input Voltage VINx 1.7V Maximum Input Voltage VINx 5.5V Maximum Output Current CLIMx Resistor-Adjustable 4A CLIMx Internal Limit 6A CLIMx Clamp Voltage Current Limit 0.5V Forward Voltage Drop VINx = 3.6V, IOUTx = 1A 50mV Typ Reverse Turn-Off Voltage VINx – VOUTx –30mV Enable Threshold EN1 and EN2 800mV dc1819afa 1 DEMO MANUAL DC1819A QUICK START PROCEDURE Demonstration circuit 1819A is easy to set up to evaluate the performance of the LTC4415. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below. 1. Set the jumpers as below: JP1 JP2 JP3 BOTH 4A 4A 2. With all power off, connect input 1 and 2 (VIN1 and VIN2) power supplies capable of at least 4A each, the loads (VOUT1 and VOUT2), and meters as shown in Figure 1. 3. Preset the system loads to 0A and the input supplies to 0V, 0A current limit. 4. Turn on the supplies, setting the current limit above 4A. Adjust the voltages to the desired value, up to 5.5V. Optional 1. For prioritization enable switchover set jumper JP1 to PRIORITY. 2. For independent, external control of the enable pins, remove the shunt on jumper JP1. Apply the logic control signal on EN1 and EN2 as necessary. 3. With all power off, change the CLIM1 and CLIM2 settings on jumpers JP2 and JP3 for different current limits. 4. For load sharing or evaluation of the diode-OR function, connect the two diode outputs, OUT1 and OUT2, together. The source of highest voltage will appear at the output. 5. For independent path control from a common input, connect the two diode inputs, IN1 and IN2, together. 5. Turn on the loads and adjust as necessary. 6. Monitor CLIM1 and CLIM2 pin voltages for a scaled representation of the output currents. 7. Adjust the supply voltages further and observe how the output states change accordingly. STAT1 and STAT2 will change state if the input voltage drops below the UVLO threshold. 8. Adjust the loads into current limit and observe how the WARN1 and WARN2 states change accordingly. dc1819afa 2 DEMO MANUAL DC1819A QUICK START PROCEDURE + VIN1 + – + + – – – LOAD1 + VIN2 + – + + – – – LOAD2 Figure 1. Proper Measurement Equipment Setup dc1819afa 3 DEMO MANUAL DC1819A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 C1, C2, C3, C4 CAP, CHIP, X5R,10μF, ±10%, 16V, 0805 MURATA, GRM21BR61C106KE15L 2 1 R1 RES, CHIP, 100k, ±1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED 3 1 R2 RES, CHIP, 2k, ±1%, 1/16W, 0402 VISHAY, CRCW04022K00FKED 4 1 R3 RES, CHIP, 21.5k, ±1%, 1/10W, 0402 VISHAY, CRCW040221K5FKED 5 2 R9, R10 RES, CHIP, 1k, ±1%, 1/16W, 0402 VISHAY, CRCW04021K00FKED 6 1 U1 IC, LTC4415EMSE LINEAR TECH., LTC4415EMSE#PBF Additional Demo Board Circuit Components 1 4 C5, C6, C7, C8 CAP, CHIP, X5R,10μF, ±10%, 6.3V, 0603 TDK, C1608X5R0J106K 2 2 D1, D2 LED, SMT, GREEN, 0603 LITE-ON, LTST-C190KGKT 3 2 D3, D4 LED, SMT, YELLOW, 0603 LITE-ON, LTST-C190YKT 4 2 R4, R5 RES, CHIP, 10k, ±5%, 1/16W, 0402 VISHAY, CRCW040210K0JNED 5 2 R6, R13 RES, CHIP, 143Ω, ±1%, 1/16W, 0402 VISHAY, CRCW0402143RFKED 6 2 R8, R12 RES, CHIP, 332Ω, ±1%, 1/16W, 0402 VISHAY, CRCW0402332RFKED 7 4 R14, R15, R16, R17 RES, CHIP, 1k, ±5%, 1/16W, 0402 VISHAY, CRCW04021K00JNED 8 2 R7, R11 RES, CHIP, 1k, ±1%, 1/16W, 0402 VISHAY, CRCW04021K00FKED 9 4 R18, R19, R20, R21 RES, CHIP, 1Ω, ±5%, 1/16W, 0402 VISHAY, CRCW04021R00JNED TEST POINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 Hardware/Components (For Demo Board Only) 2 8 E1, E2, E5, E8, E14, E15, E16, E17 1 9 E3, E4, E6, E7, E9, E10, E11, E12, E13 TEST POINT, TURRET, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0 3 1 JP1 3 Pin Jumper, 2mm SAMTEC, TMM-103-02-L-S 4 2 JP2, JP3 2 × 5 Pin Jumper, 2mm SAMTEC, TMM-105-02-L-D 5 3 JP1-3 6 4 SHUNT, 2mm SAMTEC, 2SN-KB-G STAND-OFF, NYLON, 0.500" KEYSTONE, 8833 dc1819afa 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 E4 E3 E2 GND CLIM2 CLIM1 GND E9 E8 E7 E6 1.7V - 5.5V VIN2 EN2 EN1 GND 1.7V - 5.5V E5 R19 1 5% 4 R6 143 R5 10k R4 10k C6 10μF 6.3V 0603 VIN2 BOTH JP1 R8 332 R7 1k R9 1k R10 1k CLIM2 JP3 Iout (A) = 500/RCLPROG CLIM1 JP2 R3 21.5k R2 2k ENABLE CONTROL R1 100k INTERNAL 6A 4A 2A 1A 0.5A PRIORITY R18 1 5% C5 10μF 6.3V 0603 R11 1k 6A INTERNAL 4A 2A 1A 0.5A R12 332 3 R13 143 C2 10μF 16V 0805 C1 10μF 0805 16V 4 5 7 8 6 3 1 2 CLIM1 CLIM2 IN2 IN2 EN2 EN1 IN1 IN1 OUT2 OUT2 OUT1 OUT1 WARN2 STAT2 WARN1 STAT1 10 9 16 15 12 11 13 14 C3 10μF 16V 0805 C4 10μF 16V 0805 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CUSTOMER NOTICE UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 10%, 50V 17 GND U1 LTC4415EMSE 1 R14 1K 5% GRN D1 STAT1 VIN1 SCALE = NONE NC JOSH Y. PCB DES. APP ENG. APPROVALS 2 E1 2 1 2 VIN1 3 R16 1K 5% GRN D3 STAT2 VIN2 2 REV DESCRIPTION YLW TECHNOLOGY R20 1 5% C7 10μF 6.3V 0603 R21 1 5% C8 10μF 6.3V 0603 E14 E13 E12 E11 E18 E17 E16 GND VOUT2 1.7V - 5.5V 4A GND WARN2 E15 VOUT1 1.7V - 5.5V 4A STAT2 DATE 08-19-11 WARN1 STAT1 E10 GND JOSH Y. APPROVED 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only PRODUCTION FAB D4 WARN2 R17 1K 5% 1 REVISION HISTORY IC NO. DATE: 08-19-11 N/A SIZE 1 LTC4415EMSE DEMO CIRCUIT 1819A SHEET 1 OF 1 2 REV. DUAL 4A IDEAL DIODES WITH ADJUSTABLE CURRENT LIMIT TITLE: SCHEMATIC R15 1K 5% YLW D2 WARN1 ECO 1 2 4 1 2 VIN1 1 2 3 4 DEMO MANUAL DC1819A SCHEMATIC DIAGRAM dc1819afa 5 DEMO MANUAL DC1819A 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 dc1819afa 6 Linear Technology Corporation LT 1011 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011