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

2 Operating Conditions

  • VIN = 12 V
  • VO = 3.3 V
  • IO = 1.5 A
GUID-F0BE49FC-C89B-4A27-8348-35F83E5E48B0-low.png Figure 2-1 LM2738 Demo Board Schematic - VBOOST Derived from VOUT = 3.3 V, VIN = 12 V
GUID-96911EF6-350B-4F2F-B81A-1455F410E20D-low.png Figure 2-2 Efficiency vs Load Current - VIN = 12 V, VOUT = 3.3 V
Table 2-1 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, C5, Output Cap 22 µF, 10 V, X5R TDK C3216X5R1A226 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 VR Toshiba CRS08 -
L1 5.0 µH, 2.9 A Coilcraft MSS7341-502NL -
R1 31.6 kΩ, 1% Vishay CRCW12063162F 0805
R5 0 Ω Vishay CRCW12060R00F 0805
D4, R4 Open or No Load
Table 2-2 Bill of Materials Y-Version (550 kHz)
Part ID Part Value Manufacturer Part Number Package Type
C1, Input Cap 10 µF, 25 V, X7R TDK C3216X5R1E106 1206
C2, C5, Output Cap 22 µF, 10 V, X5R TDK C3216X5R1A226 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 VR Toshiba CRS08 -
L1 10.0 µH, 2.0 A Coilcraft MSS7341-103NL -
R1 31.6 kΩ, 1% Vishay CRCW12063162F 0805
R5 0 Ω Vishay CRCW12060R00F 0805
D4, R4 Open or No Load