SNVA341B April   2008  – December 2021 LM2738

 

  1.   Trademarks
  2. 1Introduction
  3. 2Operating Conditions
  4. 3PCB Layout - WSON
  5. 4PCB Layout - MSOP-PowerPAD
  6. 5Additional Circuit Configuration Schematics
  7. 6Revision History

5 Additional Circuit Configuration Schematics

GUID-8330675B-7CF9-49AD-AF9A-5E0FAE1E5B9D-low.pngFigure 5-1 VBOOST Derived from VIN = 5 V, for VOUT = 1.5 V
Table 5-1 Bill of Materials X-Version (1.6 MHz)
Part ID Part Value Manufacturer Part Number Package Type
C1, Input Cap 10 µF, 25 V, X7R TDK C3216X5R1E106 1206
C2, Output Cap 22 µF, 6.3 V, X5R TDK C3216X5R0J2266 1206
C3 (Boost Cap), C4 0.1 µF TDK C2012X7R1A104 0805
D2, Boost Diode 1 VF at 100-mA Diode Diodes, Inc. BAT54WS-TP SOD-323
R2, R3 10 kΩ, 1% Vishay CRCW12061002F 0805
U1 1.5-A Buck Regulator Texas Instruments LM2738 WSON-8
LM2738 MSOP-PowerPAD-8
D1, Catch Diode 0.34 VF Schottky, 1.5 A, 30 V Toshiba CRS08 -
L1 2.2 µH, 1.9A Coilcraft MSS5131-222ML -
R1 8.87 kΩ, 1% Vishay CRCW12068871F 0805
R4 0 Ω Vishay CRCW12060R00F 0805
D4, R5, C5 Open or No Load
Table 5-2 Bill of Materials Y-Version (550 kHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25 V, X7RTDKC3216X5R1E1061206
C2, C5, Output Caps22 µF, 6.3 V, X5RTDKC3216X5R0J2261206
C3 (Boost Cap), C40.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky ,1.5 A, 30 VToshibaCRS08-
L16.2 µH, 2.5 ACoilcraftMSS7341-622NL-
R18.87 kΩ, 1%VishayCRCW12068871F0805
R40 ΩVishayCRCW12060R00F0805
D4, R5Open or No Load
GUID-8057ECFC-6FCC-4C1A-B81B-7B5A48A1C19C-low.pngFigure 5-2 VBOOST Derived from VSHUNT Coming from VIN = 18 V, VOUT = 1.5 V
Table 5-3 Bill of Materials X-Version (1.6 MHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25V, X7RTDKC3216X5R1E1061206
C2, C5, Output Caps22 µF, 6.3V, X5RTDKC3216X5R0J2261206
C3 (Boost Cap), C40.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
D4, Zeneer5.1 V, 200 mWDiodes, Inc.BZX84C5V1WSOT-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky, 1.5 A, 30 VToshibaCRS08-
L12.7 µH, 1.76 ATDKVLCF5020T-2R7N1R7-
R18.87 kΩ, 1%VishayCRCW12068871F0805
R44.12 kΩ, 1%VishayCRCW12064121F0805
R5Open or No Load
Table 5-4 Bill of Materials Y-Version (550 kHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25 V, X7RTDKC3216X5R1E1061206
C2, C5, Output Caps47 µF, 6.3 V, X5RTDKC3216X5R0J4761206
C3 (Boost Cap), C40.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
D4, Zeneer5.1 V, 200 mWDiodes, Inc.BZX84C5V1WSOT-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky, 1.5 A, 30 VToshibaCRS08-
L18.7 µH, 2.2 ACoilcraftMSS7341-872NL-
R18.87 kΩ, 1%VishayCRCW12068871F0805
R44.21 kΩ, 1%VishayCRCW12064211F0805
R5Open or No Load
GUID-ED9E7C59-18BC-4AAF-BC9A-384AC59CD51E-low.pngFigure 5-3 VBOOST Derived from Series Zener Diode from VIN = 15 V, VOUT = 1.5 V
Table 5-5 Bill of Materials X-Version (1.6 MHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25 V, X7RTDKC3216X5R1E1061206
C2, C5, Output Caps22 µF, 6.3 V, X5RTDKC3216X5R0J2261206
C3 (Boost Cap)0.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky, 1.5 A, 30 VToshibaCRS08-
L13.3 µH, 3.5 ACoilcraftMSS7341-332NL-
R18.87 kΩ, 1%VishayCRCW12068871F0805
R411 V, 200 mW, ZenerVishayBZX384C11-VSOD-323
D4, R5, C4Open or No Load
Table 5-6 Bill of Materials Y-Version (550 kHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25 V, X7RTDKC3216X5R1E1061206
C2, C5, Output Caps47 µF, 6.3 V, X5RTDKC3216X5R0J4761206
C3 (Boost Cap)0.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky, 1.5 A, 30 VToshibaCRS08-
L18.7 µH, 2.2 ACoilcraftMSS7341-872NL-
R18.87 kΩ, 1%VishayCRCW12068871F0805
R411 V, 200 mW, ZenerVishayBZX384C11-VSOD-323
D4, R5, C4Open or No Load
GUID-C1FDA049-BD40-486D-9312-876148D4DE58-low.pngFigure 5-4 VBOOST Derived from Series Zener Diode from VOUT = 9 V, VIN = 15 V
Table 5-7 Bill of Materials X-Version (1.6 MHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25 V, X7RTDKC3216X5R1E1061206
C2, Output Cap22 µF, 10 V, X5RTDKC3216X5R1A2261206
C3 (Boost Cap), C40.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky, 1.5 A, 30 VToshibaCRS08-
L16.2 µH, 2.5 ACoilcraftMSS7341-622NL-
R1102 kΩ, 1%VishayCRCW1206123F0805
R54.3 V, 200 mW, ZenerVishayBZX384C4V3-VSOD-323
D4, R4Open or No Load
Table 5-8 Bill of Materials Y-Version (550 kHz)
Part IDPart ValueManufacturerPart NumberPackage Type
C1, Input Cap10 µF, 25 V, X7RTDKC3216X5R1E1061206
C2, Output Cap22 µF, 10 V, X5RTDKC3216X5R1A2261206
C3 (Boost Cap), C40.1 µFTDKC2012X7R1A1040805
D2, Boost Diode1 VF at 100-mA DiodeDiodes, Inc.BAT54WS-TPSOD-323
R2, R310 kΩ, 1%VishayCRCW12061002F0805
U11.5-A Buck RegulatorTexas InstrumentsLM2738WSON-8
LM2738MSOP-PowerPAD-8
D1, Catch Diode0.34 VF Schottky, 1.5 A, 30VToshibaCRS08-
L15.0 µH, 2.9 ACoilcraftMSS7341-502NL-
R1102 kΩ, 1%VishayCRCW12061023F0805
R54.3 V, 200 mW, ZenerVishayBZX384C4V3-VSOD-323
D4, R4Open or No Load