DEMO MANUAL DC2354A LTC7149 60V, Low IQ High Voltage, Negative Output Monolithic Synchronous Regulator DESCRIPTION Demonstration circuit 2354A is a high input voltage, high efficiency synchronous monolithic step-down converter with negative output featuring the LTC7149. The DC2354A has wide input voltage range from 3.5V up to 55V. The output voltage of the DC2354A can be set as to –3.3V or –5V and “User Select” option of DC2354A allows output voltage to be in a rage from 0V to –60V. However voltage difference between user-selected negative output voltage (–VOUT) and maximum input voltage (VIN), should not exceed 60V. |–VOUT| + VIN < 60V. DC2354A is capable of delivering up to 4A of output current, nevertheless at lower input voltage load current should be reduced in accordance to enclosed derating curves. DC2354A supports three operation modes: Fixed-frequency modulation, Burst Mode™ operation and user can synchronize it with external clock also. Fixed-frequency mode of 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. PERFORMANCE SUMMARY PARAMETER The DC2354A consumes less than 15µA of quiescent current during shutdown and it consumes less than 600µA at no-load conditions in Burst Mode of operation. The DC2354A has a standard operating frequency of 500kHz, but can be adjusted in a range between 300kHz and as high as 3MHz. LTC7149, which is used in DC2354A, integrates top and bottom N-Channel MOSFETs, significantly reducing overall circuit footprint. DC2354A was designed to support multiple footprints of input/output capacitors and inductors to accommodate variety of applications. The data sheet of LTC7149 gives a complete description functionality of this regulator; also contains operation and application information and must be read in conjunction with this manual for Demonstration circuit 2354A. Design files for this circuit board are available at http://www.linear.com/demo/DC2354A 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. Specifications are at TA = 25°C CONDITIONS/NOTES VALUE Minimum Input Voltage 3.5V Maximum Input Voltage 55V Output Voltage VOUT– Regulation VIN = 3.5V – 60V –5V ± 2% or –3.3V ± 2% Maximum Continuous Output Current VOUT– 4A Preset Operating Frequency R10 = 200kΩ 500kHz External Clock Sync. Frequency Range 300kHz – 3MHz Efficiency VIN = 12V, VOUT– = –5V, IOUT = 1A VIN = 12V, VOUT– = –3.3V, IOUT = 1A 90% 90% Typical Output Ripple VOUT– VIN = 12V, VOUT– = –5V, IOUT = 1A (20MHz BW) <15mVP-P Quiescent Current at Shutdown VIN = 3.5V – 55V <14µA Input Current at No-Load VIN = 3.5V – 55V, Burst Mode Operation <600µA dc2354af 1 DEMO MANUAL DC2354A QUICK START PROCEDURE Demonstration circuit 2354A is easy to set up to evaluate the performance of the LTC7149. For proper measurement equipment configuration, set up the circuit according to the diagram in Figure 1. Before proceeding to test, insert shunt into JP2 (RUN) into OFF position, which connects the RUN pin to ground (GND), and thus, shutdown the output. Set jumper JP1 (MODE) into FCC (Forced Counties Conduction Mode) position. Set jumper JP3 (VOUT–) into –5.0V position. 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. 1.With the DC2354A set up according to the proper measurement and equipment in Figure 1, apply 16V 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 14µA, or less, in shutdown. 2.Turn on VOUT– of the circuit by inserting the shunt in header JP2 (RUN) into the ON position. The output voltage should be regulating. Measure VOUT– and it should measure –5.0V ±2%. Vary the current load, which should not exceed 4A. Vary the input voltage from 3.5V to 55V, the VOUT–, it should measure –5.0V ±2%. Maximum load current is function of input voltage and should be changed accordance to derating graphs on Figure 3. 2 3.Set JP2 (RUN) into OFF and then jumper JP3 (VOUT–) into –3.3V position. 4. Turn on VOUT2 of the circuit by inserting the shunt in header JP2 (RUN) into the ON position. The output voltage should be regulating. Measure VOUT–, it should measure –3.3V ±2% (do not apply more than the maximum voltage of 55V to the board or the part may be damaged). Vary the current load, which should not exceed 4A. Vary the input voltage from 3.5V to 55V, the VOUT–, it should measure –3.3V ±2%. 5. Set output current to zero and move jumper JP1 (MODE) into BURST position and measure VOUT–, which should be –3.3V ±2%. 6. Set output current to zero and move jumper JP1 (MODE) into BURST position and measure VOUT–, which should be –5V ±2%.. DC2354A supports synchronization to external clock referenced to input GND; use EXT_SYNC terminal for synchronization. PGOOD signal also referenced to input GND, to activate PGOOD functionality connect external voltage source to terminals VLOGIC and GND. DC2354A supports also EXTVCC function, however, EXTVCC is referenced to VOUT–. Remove R5 and install optional R33 10Ω resistor if external EXTVCC voltage source is used. Note: Do not apply more than the maximum voltage of 55V to the board or the part may be damaged. dc2354af DEMO MANUAL DC2354A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup dc2354af 3 DEMO MANUAL DC2354A QUICK START PROCEDURE GND VIN Figure 2. Measuring Input or Output Ripple 4.0 LOAD CURRENT (A) 3.5 3.0 2.5 2.0 1.5 1.0 –3.3V –5.0V 0 10 20 30 INPUT VOLTAGE (V) 40 50 DC2354A F03 Figure 3. Output Current vs. Input Voltage Derating Charts 95 EFFICIENCY (%) 90 85 80 75 5V 12V 24V 48V 70 65 0 0.5 1 1.5 2 2.5 LOAD CURRENT (A) 3 3.5 DC2354A F04 Figure 4. Efficiency vs. Load Current for Different Input Voltages 4 dc2354af DEMO MANUAL DC2354A QUICK START PROCEDURE Figure 5. Thermal Map, VIN 48V, VOUT– is –5V at 3.5A, No Air Flow dc2354af 5 DEMO MANUAL DC2354A PARTS LIST QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 CIN1 CAP, 1210 2.2μF 10% 100V X7R TDK C3225C7R1H225K 1 CIN2 CAP, 1210 10μF 10% 63V X7R MURATA GRM32ER71J106KA12K 1 CIN3 CAP, 10uF 20% 63V ELEC PANASONIC EEH-ZA1J100P 1 CIN4 CAP, 0805 1μF 10% 100V X7S TDK C2012X7S2A105K125AB 2 COUT1, COUT2 CAP, 1210 22μF 10% 25V X7R MURATA GRM32ER71E226KE15L 1 COUT3 CAP, X7R, 22μF, 25V, 1812 TDK, C4532X7R1E226M250KC 1 CTH CAP, 0603 10nF 10% 50V X7R AVX 06035A221KAT 1 CTHP CAP, 0603, 220pF, 10%, 50V, NPO AVX 06031A101KAT2A 1 CVCC CAP, 0805 2.2μF 10% 16V X7R AVX 0805YC225KAT2A 2 C1, C6 CAP, 0603 0.1μF 10% 50V X7R TDK C1608X7R1H104K080AA 1 C5 CAP, 0603 1μF 20% 25V X7R TDK C1608X7R1E105M080AB 1 L1 IND, 5.6μH COILCRAFT XAL5050-562MEB 1 RTH RES, 0603 511Ω 1% 1/10W VISHAY CRCW0603511RFKEA 2 R1, R13 RES, 0603 100kΩ 1% 1/10W VISHAY CRCW0603100KFKEA 1 R2 RES, 0603 10MΩ 1% 1/10W VISHAY CRCW060310M0FKEA 1 R5 RES, 0603 10Ω 1% 0.1W VISHAY CRCW060310RFKEA 2 R3, R4 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA 1 R10 RES, 0603 200kΩ 1% 1/10W VISHAY CRCW0603200KFKEA 1 R18 RES, 0805 1MΩ 1% 1/8W VISHAY CRCW08051M00FKEA 1 R25 RES, 0603 137kΩ 1% 0.063W VISHAY CRCW0603137KFKEA 1 R26 RES, 0603 1MΩ 1% 1/10W VISHAY CRCW06031M00FKEA 1 R29 RES, 0603 196kΩ 1% 1/10W VISHAY CRCW0603196KFKEA 1 R31 RES, 0603 20Ω 1% 0.1W VISHAY CRCW060320R0FKEA 1 R32 RES, 0603 100Ω 1% 0.1W VISHAY CRCW0603100RFKEA 1 U1 IC, NEGATIVE OUTPUT REGULATOR LINEAR TECH. LTC7149EFE28#PBF R19, R27, R30, R33 RES, 0603 OPTION OPTION C3, C4 CAP, 0603 OPTION OPTION CIN5 CAP, OPTION OPTION Additional Demo Board Circuit Components Hardware 12 E1, E2, E3, E4, E5, E6, E7, E9, E12, E13, E14, E15 TURRET MILL MAX 2501-2-00-80-00-00-07-0 3 JP1, JP2, JP3 HEADER, 3-PIN, DBL ROW 2mm SULLINS, NRPN032PAEN 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE 8833 3 XJP1, XJP2, XJP3 SHUNT SAMTEC 2SN-BK-G 6 dc2354af 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 E12 E9 E13 E1 E2 0 R3 R13 100k R19 OPT FCC 1 6 OFF 5 A JP2 4 EXT I/O 3 6 4 2 2 RUN JP1 MODE B R2 10M 1% C4 OPT C3 OPT R10 200k 1% RTH 511 1% CTH 10nF X7R 6 USER SEL 4 -3.3V 2 -5.0V R27 OPT INTVCC VOUT- JP3 VOUT- ON 1 1. ALL CAPACITORS AND RESISTORS ARE 0603. 2. ALL RESISTORS ARE 5%. 3 1 1% 5 1% EXT 3 BURST 5 R18 1M 1% 0805 VIN NOTES: UNLESS OTHERWISE SPECIFIED, GND PGOOD VLOGIC EXT I/O GND EXT_SYNC E7 VOUT- OPT R30 196k R29 100k R1 B R25 C1 0.1uF VOUTSNS GND VOUT- VOUT- VOUT- VOUT- VOUT- PGDFB PGOOD RUN MODE/SYNC RT ITH ISET CUSTOMER NOTICE 100 1% R32 16 R31 20 1% 9 5 4 3 2 1 12 11 8 10 15 18 17 C THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 13 19 21 22 23 24 25 26 27 28 6 7 14 20 CIN4 1uF 0805 100V R4 0 VOUT- C5 1uF 25V i^ SCALE = NONE `\ PCB DES. APP ENG. R5 10 1% D DATE: N/A SIZE VOUT- COUT1 22uF 25V 1210 OPT + CIN5 PROD DESCRIPTION COUT3 22uF 25V 1812 10uF 63V + CIN3 DATE i ^ APPROVED VOUT-5V / 4A MAX GND GND VIN 3.5V - 55V EXTVCC E15 VOUT- E14 E6 E5 E4 E3 01/04/16 E E LTC7149EFE28 DEMO CIRCUIT 2354A Monday, March 28, 2016 IC NO. SHEET 1 OF 1 REV. 3.1 HIGH VOLTAGE, NEGATIVE OUTPUT MONOLITHIC SYNCHRONOUS REGULATOR LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 R33 OPT COUT2 22uF 25V 1210 CIN2 10uF 63V 1210 VIN REVISION HISTORY TECHNOLOGY TITLE: SCHEMATIC C6 0.1uF COILCRAFT XAL5050-562MEB L1 5.6uH CIN1 2.2uF 100V 1210 VOUT- CVCC 2.2uF 0805 16V 3.1 VOUT- INTVCC REV - D ECO APPROVALS VOUT- EXTVCC BOOST SW SW SW SW SW SW SW VIN VIN VINREG INTVCC U1 LTC7149EFE28 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. R26 1M 1% 137k 1% CTHP 220pF C0G C SVOUT- 29 4 A 1 2 3 4 DEMO MANUAL DC2354A SCHEMATIC DIAGRAM dc2354af 7 DEMO MANUAL DC2354A 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 dc2354af Linear Technology Corporation LT 0316 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016