DEMO MANUAL DC2299A LTC3890, 60V, LOW IQ DUAL OUTPUT HIGH VOLTAGE STEP-DOWN CONVERTER DESCRIPTION Demonstration circuit 2299A is a high input voltage, high efficiency synchronous dual output buck converter featuring the LTC®3890EGN. The DC2299A has a wide input voltage range of 6V to 60V. The output voltages are set to 5V and 12V, however, the output voltage can go as high as 24V, with certain modifications. This demo board is capable of delivering up to 8A from the 5V output and up to 5A from the 12V output. The DC2299A supports three operation modes: fixed frequency modulation, pulse-skipping and Burst Mode® operation. Fixed frequency operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads. The DC2299A consumes less than 50µA of quiescent current during shutdown and less than 1mA with the outputs in regulation under a no-load condition in Burst Mode operation. The DC2299A has a standard operating frequency of 200kHz, but can be adjusted to frequencies as high as 900kHz. The DC2299A is designed to support multiple footprints of input/output capacitors and inductors to accommodate a wide variety of applications. The LTC3890 data sheet gives a complete description of this controller along with operation and application information, and must be read in conjunction with this demo board manual. Table 1. DC2299A Variants DC2299A VARIANTS IC PART NUMBER PART MARKING 2299A-A LTC3890EGN-3 LTC3890GN-3 2299A-B LTC3890EGN-1 LTC3890GN-1 *See data sheet Table 1 for differences between the parts in the LTC3890 family. Design files for this circuit board are available at http://www.linear.com/demo/DC2299A 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 PARAMETER CONDITIONS/NOTES VALUE Minimum Input Voltage 6V Maximum Input Voltage 60V Output Voltage VOUT1 Regulation VIN = 6V to 55V 5V ±2% Output Voltage VOUT2 Regulation VIN = 16V to 55V 12V ±2% Maximum Continuous Output Current VOUT1 8A Maximum Continuous Output Current VOUT2 5A Preset Operating Frequency 200kHz External Clock Sync. Frequency Range 75kHz to 850kHz Efficiency VIN = 24V, VOUT2 = 12V, IOUT1 = 3A (See Figure 4 Efficiency Curves for Complete Operating Range) 97% Typical Output Ripple VOUT VIN = 36V, VOUT2 = 12V, IOUT2 = 3A (20MHz BW) <35mVP-P Quiescent Current at Shut-down VIN = 16V to 55V <50µA Input Current at No-Load VIN = 16V to 55V <1mA dc2299afa 1 DEMO MANUAL DC2299A QUICK START PROCEDURE Demonstration circuit 2299A is easy to set up to evaluate the performance of the LTC3890. For proper measurement equipment configuration, set up the circuit according to the diagram in Figure 1. Before proceeding to test, insert shunts into JP3 and JP2 (RUN1, 2) into the OFF position, which connects the RUN pins to ground (GND), and thus, shuts down the outputs. Set jumper JP1 (MODE) into FCM (Forced Counties Mode) position. 2. Turn on VOUT1 of the circuit by inserting the shunt in header JP3 (RUN1) into the ON position. The output voltage should be regulating. Measure VOUT1 – it should measure 5.0V ±2% (Do not apply more than the rated maximum voltage of 60V to the board or the part may be damaged). Vary the VOUT1 load, which should not exceed 8A. Vary the input voltage from 6V to 55V, the VOUT – it should measure 5.0V ±2%. NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals. See Figure 2 for proper scope probe technique. 3. Turn on VOUT2 of the circuit by inserting the shunt in header JP2 (RUN2) into the ON position. The output voltage should be regulating. Measure VOUT2 – it should measure12.0V ±2% (Do not apply more than the rated maximum voltage of 60V to the board or the part may be damaged). Vary the VOUT2 load, which should not exceed 5A. Vary the input voltage from 16V to 55V, the VOUT – it should measure 12.0V ±2%. 1. With the DC2299A set up according to the proper measurement and equipment in Figure 1, apply 20V at VIN. Measure VOUT; it should read 0V. If desired, one can measure the shutdown supply current at this point. The supply current will be approximately 50µA, or less, in shutdown. 4. Set output current to zero and move jumper JP1 (MODE) into Burst Mode position and measure VOUT1 and VOUT2. 5. Set output current to zero and move jumper JP1 (MODE) into PLS SKIP position and measure VOUT1 and VOUT2. Figure 1. Proper Measurement Equipment Setup 2 dc2299afa DEMO MANUAL DC2299A QUICK START PROCEDURE Figure 2. Measuring Output Ripple 96 95 EFFICIENCY (%) 94 93 92 91 90 89 16VIN 24VIN 48VIN 88 87 2 3 4 5 6 LOAD CURRENT (A) 7 8 DC2299A F03 Figure 3. Efficiency vs. Input Voltage for VOUT1 (5V) 99 98 EFFICIENCY (%) 97 96 95 94 16VIN 24VIN 48VIN 93 92 1.0 1.5 2.0 2.5 3.0 3.5 4.0 LOAD CURRENT (A) 4.5 5.0 DC2299A F04 Figure 4. Efficiency vs. Input Voltage for VOUT2 (12V) dc2299afa 3 DEMO MANUAL DC2299A QUICK START PROCEDURE Figure 5. Thermal Map, VIN 48V, IOUT1 5V at 8A, IOUT2 12V at 5A No Air Flow, TA = 25°C 4 dc2299afa DEMO MANUAL DC2299A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP., POSCAP 150μF 16V 7343 PANASONIC, 16TQC150MYF 2 7 C2, C3, C5, C22, C34, C35, C36 CAP., X7R, 2.2μF 100V 10% 1210 TDK, C3225X7R1H225K 3 1 C4 CAP., ALUM., 47μF, 63V, 20%, 10 × 10.5 SUN ELEC., 63HVH47M 4 2 C18, C25 CAP., X7R, 0.1μF 50V 10% 0603 TDK, C1608X7R1H104K 5 1 C6 CAP., X7R, 0.1μF 100V 10%, 0805 MURATA, GCM21BR72A104KA37L 6 2 C7, C19 CAP., X7R, 0.01μF 100V 10% 0603 AVX, 06031C103KAT 8 2 C10, C13 CAP., NPO, 1800pF 50V 5% 0603 MURATA, GRM1885C1H182JA01D 9 2 C11, C14 CAP., NP0, 100pF 100V 10% 0603 AVX, 06031A101KAT 10 2 C12, C20 CAP., X7R, 1000pF 100V 10%, 0603 AVX, 06031C102KAT 11 2 C15, C24 CAP., X5R, 10μF 35V 20% 1210 TAIYO YUDEN, GMK325BJ106MN-T 12 1 C16 CAP., POSCAP 470μF 6.3V PANASONIC, 6TPE470M 13 1 C21 CAP., X7R, 4.7μF 16V 10% 0805 AVX, 0805YC475KA 14 1 C30 CAP, X5R, 1μF 25V 10% 0603 AVX, 06033D105KAT2A 15 2 D3, D4 DIODE, SCHOTTKY, DFLS1100, DI-123 DIODES, INC.,DFLS1100 16 1 L1 IND., 5.6μH, 20% COILCRAFT, XAL1010-562MED 17 1 L2 IND., 15μH, 20% COILCRAFT, XAL1010-153MED 18 2 Q1, Q3 XSTR, POWER MOSFET LFPAK RENESAS ELECTRONIC, RJK0651DPB 19 2 Q2, Q4 XSTR, POWER MOSFET LFPAK RENESAS ELECTRONIC, RJK0652DPB 20 1 RS1 RES., 0.005Ω 1% 1/4W 1206 VISHAY, WSL12065L000FEA 21 1 RS2 RES., 0.008Ω 1% 1/4W 1206 VISHAY, WSL12068L000FEA 22 1 R18 RES., 35.7k 1% 0603 VISHAY, CRCW060335K7FKEA 23 2 R2, R24 RES., 100k 1% 0603 VISHAY, CRCW0603100KFKEA 24 1 R3 RES., 2.2Ω 1% 1206 VISHAY, CRCW12062R20FNEA 25 2 R8, R9 RES., 100k 1% 0805 VISHAY, CRCW0805100KFKEA 26 1 R10 RES., 10k 1% 0603 VISHAY, CRCW060310K0FKEA 27 1 R11 RES., 7.15k 1% 0603 VISHAY, CRCW06037K15FKEA 28 1 R12 RES., 18.7k 1% 0603 VISHAY, CRCW060318K7FKEA 29 1 R15 RES., 20k, 1%, 0603 VISHAY, CRCW060320K0FKEA 30 1 R23 RES., 1M 1% 0805 VISHAY, CRCW08051M00FKEA 31 2 R29, R30 RES., 2.0Ω 1% 0603 VISHAY, CRCW06032R00FKEA 32 1 U1, DC2299A-A IC., LTC3890EGN-3, 28-PIN SSOP LINEAR TECH., LTC3890EGN-3#PBF 33 1 U1, DC2299A-B IC., LTC3890EGN-1, 28-PIN SSOP LINEAR TECH., LTC3890EGN-1#PBF dc2299afa 5 DEMO MANUAL DC2299A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components 1 0 C8, C9, C17, C23, C28, C32, C33 CAP., OPT, 0603 OPT 2 0 C26, C27 CAP., OPT, 1210 OPT 3 0 C29 CAP., OPT, 10X12.5 OPT 4 2 D1, D2 DIODE, OPT, DI-123 OPT 5 0 Q5, Q6 XSTR, OPT LFPAK OPT 6 8 R1, R4, R5, R13, R14, R20, R21, R28 RES., 0Ω, 1% 0603 VISHAY, CRCW06030000Z0EA 7 0 R6, R7, R16, R17, R25-R27, R31, R33 RES., OPT 0603 OPT 8 0 R22 RES., OPT 0805 OPT Hardware 1 10 E1-E10 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 HEADER, 2 × 3 2mm SULLINS, NRPN032PAEN-RC 3 2 JP2, JP3 HEADER, 1 × 3 2mm SULLINS, NRPN031PAEN-RC 4 3 XJP1, XJP2, XJP3 SHUNT, 2mm SAMTEC, 2SN-BK-G 5 4 MTGS AT 4 CORNERS STANDOFF, NYLON 0.50 KEYSTONE, 8833(SNAP-ON) 6 dc2299afa 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 E7 E2 E1 C23 OPT Vout2 + C34 2.2uF 100V 1210 C24 10uF 1210 C1 150uF/16V C35 2.2uF 100V 1210 A + 0 R8 L2 D2 OPT 15uH C8 OPT R4 100k C4 47uF/63V Vout2 C26 OPT 1206 0.008 RS2 C36 2.2uF 100V 1210 1. ALL RESISTORS AND CAPACITORS ARE 0603. NOTE: UNLESS OTHERWISE SPECIFIED GND 12V / 5A VOUT2 GND 6V UP TO 60V C4 IS FOR DEMO BOARD TEST ONLY + 7.15k OFF ON B JP3 3 2 RUN1 1 4 Q3 RJK0651DPB C3 2.2uF 100V 1210 OPT R26 RUN1 OPT R22 Q6 OPT 4 VIN C30 1uF 4 VIN JP2 RUN2 OFF ON 3 2 1 * IntVcc OPT R27 C 24 23 25 26 3 4 8 28 1 2 19 21 6 C33 OPT DFLS1100 D4 Boost1 BG1 SW1 TG1 Sense1+ Sense1- RUN1 TRACK/SS1 ITH1 VFB1 IntVCC PGND R18 Q2 RJK0652DPB 4 4 VIN 4 Q1 RJK0651DPB 2.2uF 100V 1210 C2 C22 2.2uF 100V 1210 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE TG1 0 C7 0.01uF OPT R7 JP1 OPT R6 Vout2 BURST D D1 OPT 5.6uH L1 C9 OPT SCALE = NONE APP ENG. 0 R5 Vout1 ECO * C27 OPT 1206 0.005 RS1 DATE: N/A SIZE -A + TECHNOLOGY -B E8 C17 OPT 5V / 8A GND VOUT1 GND SYNC VICTOR K. E6 E5 E3 DATE 12-29-14 APPROVED IC NO. Monday, December 29, 2014 E SHEET LTC3890EGN-1 / LTC3890EGN-3 DEMO CIRCUIT 2299A 1 OF 1 1 REV. LOW QUIESCENT CURRENT DUAL OUTPUT HIGH VOLTAGE STEP-DOWN CONVERTER LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 U1 LTC3890EGN-1 ASSY LTC3890EGN-3 C15 10uF 1210 C16 470uF/6.3V Vout1 PRODUCTION 1 E DESCRIPTION REVISION HISTORY REV LT VICTOR K. TITLE: SCHEMATIC APPROVALS PCB DES. Q5 OPT R12 18.7k R9 100k IntVcc 100K R2 IntVcc MODE 1 2 3 4 5 6 0 R1 D 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. 0.1uF C18 R29 2.0 R13 0 C12 1000pF R14 FC PLS SKIP C28 OPT C10 1800pF C11 100pF R10 10K C21 4.7uF 16V IntVcc BG1 RUN1 35.7K OPT R31 IntVcc PLLIN/MODE U1 C RUN2 1 Meg R23 DFLS1100 Boost2 BG2 SW2 TG2 Sense2+ Sense2- RUN2 TRACK/SS2 ITH2 VFB2 ExtVcc PGOOD1 0.1uF R30 2.0 17 18 16 15 11 10 9 14 13 12 20 27 D3 RUN2 C6 0.1uF 0805 2.2 R3 C25 BG2 TG2 C20 1000pF C32 OPT 0 R21 0 R20 R15 20K C14 100pF C13 1800pF R25 OPT Vout2 Vout1 R28 0 C5 2.2uF 100V 1210 OPT R16 Vout1 C19 0.01uF R17 OPT Q4 RJK0652DPB R11 OPT R33 R24 100k IntVcc E10 EXTVCC E9 PGOOD C29 OPT VIN 22 Vin 5 FREQ VIN 5 3 2 1 5 3 2 1 5 3 2 1 SGND 7 5 1 2 3 5 1 2 3 B 5 1 2 3 A 1 2 3 4 DEMO MANUAL DC2299A SCHEMATIC DIAGRAM dc2299afa 7 DEMO MANUAL DC2299A 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 8 dc2299afa Linear Technology Corporation LT 0115 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 2014