LTC7801EUFD

LTC7801EUFD LINER | Alldatasheet

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DESCRIPTION

Synchronous Buck Converter Demonstration circuit 2641A is a single output synchro- nous buck converter featuring the LTC7801EUFD in the 24-lead QFN package. The input voltage range is from 16V to 100V and the output is 12V/10A. The DC2641A is configured with a sense resistor for overcurrent protec - tion. Inductor DCR current sensing is optional. The board has a lot of features including an optional onboard NMOS LDO for DRVCC, a switch-mode power supply for EXTV CC, jumper selectable 100% duty cycle operation in dropout, a mode selector pin that allows the converter to run in CCM, pulse-skip, adjustable burst L, L T , L TC, L TM, Linear Technology, Burst Mode, PolyPhase and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY clamp or default Burst Mode® operation, a PGOOD output voltage monitor and PLLIN for PolyPhase® operation. The LTC7801 data sheet gives a complete description of the part, operation and application information and must be read in conjunction with this demo manual for DC2641A. Design files for this circuit board are available at http://www.linear .com/demo/DC2641A Specifications are at TA = 25°C PARAMETER CONDITIONS VALUE Input Voltage Range 16V ~ 100V Output Voltage VOUT VIN = 16~100V, IOUT = 0~10A, JP4: FCM 12V ± 2% (11.76V ~ 12.24V) Maximum Output Current IOUT ,MAX VIN = 16~100V 10A Default Operating Frequency (Typical) 150kHz External Clock Sync. Frequency Range 75kHz – 850kHz Typical Full Load Efficiency (See Figure 4) VIN = 48V, VOUT = 12V, IOUT = 10A, fSW = 150 kHz 95.3%

Demonstration circuit DC2641A is easy to set up to evaluate the performance of the LTC7801EUFD. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 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 V IN or VOUT and GND terminals or directly across relevant capacitor . See Figure 2 for proper scope probe technique. 1. Place jumpers in the following positions: JP1 ON JP4 FCM JP5 ON JP8 OFF 2. With power off, connect the input power supply to VIN and GND. 3. Turn on the power at the input. NOTE: Make sure that the input voltage is higher than 16V and does not exceed 100V. 4. Check the output voltage. The output voltage should be between 11.76V and 12.24V. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, effi - ciency and other parameters. NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high.

Table 1. Mode Selection and Synchronized Operation Options Pulse-Skipping Operation P .S. P .S. Table 2. Optional Inductor DCR Current Sensing adjustable clamp level by changing the position of JP4. JP4 setting, the DC2641A will operate in different modes. See Table 1 for the detailed description. for 99% duty cycle operation in dropout. tion current or use an iron powder type material. ing setup and to the data sheet for more details. Table 3. Low Input Quiescent Current Configuration

1. Leave the JP7 OPEN. This step disconnects the EXTVCC
2. Keep the JP8 at the “ON” position. The on-board BIAS

supply output voltage is 12V.

1. Keep the JP8 at the “OFF” position.
2. Apply a DC voltage (< 14V) between the EXTV CC and

GND turret, after the input voltage is established. Figure 3. DC2641A VOUT Typical Efficiency vs Load Current

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CIN1 CAP ., 100µF, ELECT , 200V, 20%, 16×20mm, THT , NRB-XS Series NIC NRB-XS101M200V16x20TBF 2 5 CIN3, CIN4, CIN8, C14, C15 CAP ., 2.2µF, X7R, 100V, 10%, 1812 TDK, C4532X7R2A225K230KA 3 3 CIN2, CIN6, CIN7 CAP , 1µF, X7R, 10V, 10%, 0805 AVX 0805ZC105KAT2A 4 1 COUT1 CAP , 22µF, X7R, 16V, 10%, 1210 TDK, C3225X7R1C226K250AC 5 2 COUT2, COUT3 CAP ., 150µF, TANT , 16V, 20%, 7343, D-CASE AVX TPSD157M016R0125 6 3 C2, C4, C13 CAP , 0.1µF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A 7 1 C3 CAP , 1000pF, X7R, 50V, 10%, 0603 AVX 06035C102KAT2A 8 1 C6 CAP , 4700pF, X7R, 50V, 10%, 0603 AVX 06035C472KAT2A 9 1 C7 CAP , 1µF, X7R, 16V, 20%, 0603 TDK, C1608X7R1C105M080AC 10 1 C9 CAP , 10pF, X7R, 50V, 10%, 0603 AVX 06035C100KAT2A 11 1 C10 CAP ., 100pF, C0G, 50V, 5%, 0603 AVX 06035A101JAT2A 12 1 C11 CAP , 0.1µF, X7R, 100V, 10%, 1206 AVX 12061C104KAT2A 13 1 C12 CAP , 4.7µF, X5R, 16V, 20%, 0603 TDK C1608X5R1C475M080AC 14 1 L1 IND., 33µH, PWR, 15%, 12A, 11.4mΩ, 2013 WURTH ELEKTRONIK 7443633300 MSS1048T Series, AEC-Q200 COILCRAFT MSS1048T-474KLB 16 2 Q2, Q3 XSTR., PWR MOSFET , N-CH, 120V, 44A, PG-TDSON-8, SuperSO8 INFINEON BSC190N12NS3 G 17 1 Q4 XSTR., PWR MOSFET , N-CH, 120V, 98A, PG-TDSON-8, SuperSO8 INFINEON BSC077N12NS3 G 18 1 RS1 RES, 0.006Ω, 1%, 2W, 2512, HIGH PWR, SENSE, AEC-Q200 VISHAY WSL25126L000FEA18 19 1 R6 RES., 301kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603301KFKEA 20 1 R9 RES., 10MΩ, 5%, 1/8W, 0805, AEC-Q200 VISHAY CRCW080510M0JNEA 21 1 R12 RES., 2.2Ω, 5%, 1/8W, 0805, AEC-Q200 VISHAY CRCW08052R20JNEA 22 2 R13, R14 RES., 10kΩ, 5%, 1/10W, 0603, AEC-Q200 VISHAY CRCW060310K0JNEA 23 1 R15 RES., 140kΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW0603140KFKEA 24 3 R16, R17, R23 RES., 100kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603100KFKEA 25 1 R18 RES., 49.9kΩ, 1%, 1/10W, 0603 VISHAY CRCW060349K9FKEA 26 1 R25 RES., 30.1kΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW060330K1FKEA 27 1 R26 RES., 80.6kΩ, 1%, 1/10W, 0603 VISHAY CRCW060380K6FKEA 28 2 R30, R36 RES., 10Ω, 1%, 1/10W, 0603 VISHAY CRCW060310R0FKEA 29 1 R31 RES., 2MΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW06032M00FKEA 30 1 R32 RES., 267kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603267KFKEA 31 1 R34 RES., 196kΩ, 1%, 1/10W 0603 VISHAY CRCW0603196KFKEA 32 1 U1 IC, HIGH VOL TAGE DC/DC BUCK REG., QFN-24 (4mm×5mm) LINEAR TECH. LTC7801UFD#PBF 33 1 U2 IC, SYNCHRONOUS STEP DOWN REGULATOR, 150V, 100mA, MSOP-16 LINEAR TECH LTC3639EMSE#PBF

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components 1 0 CIN5 (OPT) CAP , OPT 1812 OPTION 2 0 COUT4 (OPT) CAP , OPTION 7343 OPTION 3 0 C1, C5, C8, C16 (OPT) CAP , OPTION 0603 OPTION 4 0 D1 (OPT) DIODE, OPTION SOD-123 OPTION 5 0 D2 (OPT) DIODE, OPTION SOD-323 OPTION SER2915H Series, AEC-Q200 COILCRAFT SER2915H-223KL OPTION 7 0 Q1, Q6, Q7 (OPT) XSTR, OPTION TO252-3 OPTION 8 0 Q5 (OPT) XSTR, OPTION LFPAK OPTION 9 0 Q12, Q13 (OPT) XSTR, OPT IN_PG_TS OPTION 10 0 R1 (OPT) RES, OPTION 0805 OPTION 11 8 R2, R8, R22, R24, R27, R28, R29, R35 RES, 0Ω 1/10W 0603 VISHAY CRCW06030000Z0EA 12 0 R7, R11, R19, R20, R21, R37, R38, R39, R40(OPT) RES, OPTION 0603 OPTION 13 0 R33 (OPT) RES, OPTION 1206 OPTION Additional 1 10 E1-E10 TEST POINT , TURRET , 0.094", MTG. HOLE MILL-MAX 2501-2-00-80-00-00-07-0 2 3 JP1, JP2, JP5 CONN., HDR, MALE, 1×3, 2mm, THT , STR WURTH ELEKTRONIK, 62000311121 3 3 JP3, JP6, JP7 CONN., HDR, MALE, 1×2, 2mm, THT , STR WURTH ELEKTRONIK, 62000211121 4 1 JP4 CONN., HDR, MALE, 2×4, 2mm, THT , STR WURTH ELEKTRONIK, 62000821121 5 4 J1, J2, J3, J4 CONN., BANANA JACK, FEMALE, THT , NON-INSULATED, SWAGE KEYSTONE 575-4 6 7 XJP1, XJP2, XJP3, XJP4, XJP5, XJP6, XJP7 CONN., SHUNT , FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421 7 4 MH1, MH2, MH3, MH4 STANDOFF , NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 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 A A B B C C D D VOUT GND FCM P.S. BURST ADJ. BURST DEFAULT 7443633300 MSS104BT EXTVCC INTVCC INTVCC INTVCC VIN INTVCC INTVCC INTVCC VIN VIN VIN VIN VOSP VOSP TG SW BG SW 2SW SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Monday, April 10, 2017 11 HIGH VOLTAGE DC-DC BUCK REGULATOR LT D L N/A LTC7801UFD DEMO CIRCUIT 2641A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Monday, April 10, 2017 11 HIGH VOLTAGE DC-DC BUCK REGULATOR LT D L N/A LTC7801UFD DEMO CIRCUIT 2641A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Monday, April 10, 2017 11 HIGH VOLTAGE DC-DC BUCK REGULATOR LT D L N/A LTC7801UFD DEMO CIRCUIT 2641A

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV DLPRODUCTION3 04/10/17 DESCRIPTION DATE APPROVEDECO REV DLPRODUCTION3 04/10/17 DESCRIPTION DATE APPROVEDECO REV DLPRODUCTION3 04/10/17 E10 RUN R11 OPT R38 OPT JP2 ON OFF VBIAS LTC7801UFD INTVCC 20OVLO21 DRVSET9 DRVUV10 TG 11 FREQ8 PGOOD7 RUN 19 SENSE1-23 GND25 BG 14 BOOST 13 PLLIN6 SENSE1+22 NDRV 16 DRVCC 15 GND4 MODE3 EXTVCC 18 VIN 17 SS24 VFB1 ITH2 CPUMP_EN5 SW 12 R36 C13 0.1uF C14 4.7uF 100V 1812 JP7 VIN- R27 10M 0805 R29 BSC190N12NS3G R31 COUT1 22uF 16V 1210 R14 10k JP3 RS1 0.006 2512 C1 OPT R32 267k R37 OPT C9 10pF L1 33uH PGOOD VIN 16V - 100V 1nF CIN4 4.7uF 100V 1812 C8 OPT JP6JP4 MODE 1 2 3 4 5 6 7 8 BSC190N12NS3G R33 OPT 1206 OPT 2 3 COUT2 150uF 16V 7343 CIN5 OPT 100V 1812 PLLIN CIN6 1uF 100V 0805 R21 OPT 1uF R24 0 R34 196k OPT C12 4.7uF OPT R35 C16 OPT R17 100k CIN3 4.7uF 100V 1812 R13 10K COUT3 150uF 16V 7343 GND 0.1uF C2 0.1uF R15 140k 1% R25 30.1k L2 470uH R8 0 R40 OPT COUT4 OPT 7343 R18 49.9k R28 0 OPT 2 3 OPT R16 100k EXTVCC R26 80.6k OPT R12 2.2 0805 GND CIN7 1uF 100V 0805 CIN2 1uF 100V 0805 CIN8 4.7uF 100V 1812 C6 4700pF JP1 ON OFF RUN R39 OPT + CIN1 100uF 200V OPT 2 3 C11 0.1uF 100V 1206 R2 0 R30 OPT C10 100pF MODE R23 100K R22 0 OPT 0805 R20 OPT VOUT 12V/10A LTC3639EMSE SW 1 NC 2 VIN3 NC 4 FBO5 VPRG1 7 VPRG2 6 GND8 VFB 9 SS 10ISET11 OVLO12 NC 13 RUN14 NC 15 GND16 GND17 301k SS JP5 ON OFF 100% DUTY VIN R19 OPT C15 4.7uF 16V 1812 BSC077N12NS3G1 SENSE1- SENSE1+ SW TG VOUT SENSE1+ SENSE1- EXTVCC BG SW TG BG

DEMO MANUAL DC2641A  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