DEMO MANUAL DC1700A LTC3613EWKH Fast, High Efficiency Step-Down Regulator DESCRIPTION Demonstration circuit 1700A is a fast, high efficiency synchronous buck DC/DC converter with 4.5V to 24V input range. It can supply 15A maximum load current at 1.5V output. The demo board features the LTC®3613EWKH regulator. No external MOSFETs are required. The controlled on-time constant frequency valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation. Differential output voltage sensing along with a precision internal reference combine to offer an accurate output regulation. The LTC3613 is ideal for applications such as distributed power systems, servers and point-of-load converters. The LTC3613EWKH is in a 7mm × 9mm 54-pin QFN package. The light load operation mode of the converter is determined with the MODE/PLLIN pin. Use JP2 jumper to select discontinuous mode (DCM) or forced continuous mode (CCM) operation. Switching frequency is pre-set at about 350kHz. This frequency can be modified from 200kHz to 1MHz by changing the value of a resistor (R18). The converter can also be externally synchronized from 200kHz to 1MHz through the MODE/PLLIN pin (PLLIN terminal on the board). To shut down the converter, one simple way is to force the RUN pin below 1.1V (JP1: OFF). The power good output (PGOOD terminal) is low when the output voltage is outside of the ±7.5% regulation window. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, 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 PARAMETER (TA = 25°C) CONDITIONS Input Voltage Range VALUE 4.5V to 24V Output Voltage, VOUT VIN = 4.5V to 24V, IOUT = 0A to 15A 1.5V ±2% Maximum Output Current, IOUT VIN = 4.5V to 24V, VOUT = 1.5V 15A Typical Output Ripple VIN = 12V, IOUT = 15A (20MHz BW) 40mVP–P Typical Efficiency VIN = 12V, VOUT = 1.5V, IOUT = 15A 87.5% Typical Switching Frequency 350kHz dc1700af 1 DEMO MANUAL DC1700A QUICK START PROCEDURE Demonstration circuit 1700A is easy to set up to evaluate the performance of the LTC3613. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: 5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters. 1. With power off, connect the input power supply to VIN (4.5V to 24V) and GND (input return). Note: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead. 2. Connect the 1.5V output load between VOUT and GND (Initial load: no load). 3. Connect the DVMs to the input and outputs. 4. Turn on the input power supply and check for the proper output voltages. VOUT should be 1.5V ±2%. Figure 1. Proper Measurement Equipment Setup + VOUT – COUT GND Figure 2. Measuring Output Voltage Ripple dc1700af 2 DEMO MANUAL DC1700A QUICK START PROCEDURE 91 90 89 EFFICIENCY (%) 88 87 86 85 84 83 82 0 5 10 15 LOAD CURRENT (A) Figure 3. Efficiency vs Load Current (VIN = 12V, VO = 1.5V, CCM) dc1700af 3 DEMO MANUAL DC1700A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 CIN1, CIN2 CAP, 1210 10μF 10% 16V X5R AVX, 1210YD106KAT 2 1 CIN4 CAP, 82μF, 25V, Sanyo SANYO, 25SVPD82M 3 2 COUT1, COUT2 CAP, 1206 100μF 20% 6.3V X5R MURATA, GRM31CR60J107ME39L 4 2 COUT3, COUT4 CAP, 7343 330μF 20% 2.5V POSCAP SANYO 2R5TPE330M9 5 2 C1, C8 CAP, 0603 0.1μF 10% 25V X7R TDK C1608X7R1E104K 6 1 C2 CAP, 0603 1000pF 10% 50V X7R AVX, 06035C102KAT 7 2 C3, C5 CAP, 0805 4.7μF 10% 16V X5R TDK C2012X5R1C475K 8 1 C6 CAP, 0603 47pF 10% 25V NPO AVX, 06033A470KAT2A 9 1 C7 CAP, 0603 0.01μF 10% 50V X7R AVX, 06035C103KAT 10 1 C9 CAP, 0603 270pF 10% 25V NPO AVX, 06033A271KAT2A 11 1 C10 CAP, 0603 1μF 10% 25V X5R AVX, 06033D105KAT 12 1 D1 DIODE,CMDSH-3 SOD323 CENTRAL CMDSH-3 13 1 L1 IND., 0.47μH, FP1109 series COILTRONICS, FP1109-R47-R 14 1 Q5 XSTR, MOSFET, DPAK-TO252AA VISHAY SUD50N03-12P-E3 15 1 RS1 RES, 2010 0.0015Ω 1% 1/2W VISHAY WSL20101L500FEA 16 1 R1 RES, 0603 100k 1% 1/10W VISHAY CRCW0603100KFKEA 17 3 R2, R12, R17 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA 18 2 R4, R5 RES, 0603 10Ω 1% 1/10W VISHAY CRCW060310R0FKEA 19 2 R6, R8 RES, 0603 100Ω 1% 1/10W PANASONIC, ERJ-3EKF1000V 20 1 R10 RES, 0603 90.9k 1% 1/10W PANASONIC, ERJ-3EKF9092V 21 1 R11 RES, 0603 60.4k 1% 1/10W VISHAY, CRCW060360K4FKEA 22 1 R13 RES, 0603 2.2Ω 1% 1/10W NIC, NRC06F2R20TRF 23 1 R15 RES, 0603 21k 1% 1/10W VISHAY, CRCW060321K0FKEA 24 1 R18 RES, 0603 115k 1% 1/10W VISHAY, CRCW0603115KFKEA 25 2 R20, R23 RES, 0603 10k 1% 1/10W NIC, NRC06F1002TRF 25 1 R22 RES, 2010 0.01Ω 1% 1/2W VISHAY WSL2010R0100FEA 27 1 U1 LTC3613EWKH QFN-56-7X9 Additional Demo Board Circuit Components 28 1 CIN3 OPT, 1210 29 2 COUT5, COUT6 OPT 30 3 C4, R9, R16 OPT 31 1 R3 OPT 32 4 R7, R14, R19, R21 OPT E1, E2, E3, E4, E5, E6, E7, E8, TURRET Demo Board Only 33 12 34 MILL-MAX 2501-2-00-80-00-00-07-0 E9, E10, E11, E12 35 2 JP1, JP2 HEADER, 3PIN, 2mm SAMTEC TMM-103-02-L-S 36 2 XJP1, XJP2 SHUNT, 2mm SAMTEC 2SN-BK-G 37 2 J1, J2 JACK, BANANA KEYSTONE 575-4 38 2 J3, J4 CONN, BNC, 5 PINS CONNEX 112404 dc1700af 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. A B C JP2 EXTVCC PLLIN E9 E10 VIN R14 OPT 5 EXTVCC R23 10k 44 43 42 41 40 39 38 37 36 51 50 49 48 47 46 45 52 59 R21 OPT R19 OPT INTVCC R12 0 1 2 3 E12 E11 MODE 1 2 3 DCM CCM OFF ON TRACK PGND PGND PGND PGND PGND PGND PGND PGND PGND SW SW SW SW SW SW SW NC SW U1B LTC3613EWKH JP1 RUN SGND SGND SGND SGND SGND SGND PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PGOOD 16 17 19 28 29 57 2 3 4 5 6 7 8 9 58 56 55 54 53 C4 OPT R16 OPT 270pF C9 13 21K 47pF RT VRNG ITH TRACK/SS VOSNS+ VOSNS- VOUT SNS- SNS+ 2. ALL RESISTORS ARE IN 0603 ALL CAPACITORS ARE IN 0603 4 1. WHEN DCR SENSING IS IMPLEMENTED, SHORT RS1 AND R9; DO NOT POPULATE R6 AND R8. 11 31 32 1 33 EXTVCC 3 S- R9 OPT R7 OPT CUSTOMER NOTICE FP1109-R47 0.47uH L1 OPT R3 S+ CIN1 10uF 25V 1210 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE Q5 DATE: N/A SIZE 330uF 2.5V 7343 CIN3 1210 OPT +COUT3 82uF 25V SANYO 25SVPD82M +CIN4 VIN 330uF 2.5V 7343 +COUT4 VOUT PRODUCTION R20 10K 1 LOAD STEP CIRCUIT 5% DUTY CYCLE MAX GND PULSE GEN VOUT VIN- GND 4.5V - 24V LTC3613EWKH 1 DEMO CIRCUIT 1700A Tuesday, August 23, 2011 IC NO. SHEET 1 OF 1 3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only J4 E8 E7 J3 VIN+ GND 1.5V / 15A VOUT VO_SNS- VO_SNS+ VIN DATE CHARLIE Z. 08-23-11 APPROVED FAST, HIGH EFFICIENCY STEP-DOWN REGULATOR TECHNOLOGY 1 C3 4.7uF 16V 0805 E6 E5 E4 E3 J2 J1 E2 E1 DESCRIPTION REVISION HISTORY LOAD STEP CIRCUIT R5 10 3 REV TITLE: SCHEMATIC R22 0.01 2010 SUD50N03-12P APP ENG. CHARLIE Z. AK VOUT R4 10 __ ECO COUT5 OPT 1206 COUT2 100uF 6.3V 1206 COUT6 OPT 1206 2 APPROVALS CIN2 10uF 25V 1210 COUT1 100uF 6.3V 1206 PCB DES. 2010 RS1 0.0015 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. R13 2.2 INTVCC SW D1 CMDSH-3 INTVCC 1 2 C8 0.1uF 50V C5 4.7uF 16V 0805 C1 0.1uF 16V R2 0 INTVCC 34 30 EXTVCC 27 C10 NC 26 1uF RUN MODE/PLLIN SVIN PVIN INTVCC INTVCC 10 SW 35 SW 36 PGND BOOST U1A LTC3613EWKH PGOOD FSW = 350kHz R18 115K 25 24 23 22 21 20 18 14 1000pF C2 15 R11 60.4K S- S+ R17 0 R15 C6 R10 90.9K R8 100 R6 100 R1 100K INTVCC NOTES: UNLESS OTHERWISE SPECIFIED INTVCC C7 0.01uF SW 4 SGND 12 5 2 3 D VIN A B C D DEMO MANUAL DC1700A SCHEMATIC DIAGRAM dc1700af 5 DEMO MANUAL DC1700A 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 dc1700af 6 Linear Technology Corporation LT 1011 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011