SNVA432D March   2010  – January 2022 LM21305

 

  1.   Trademarks
  2. 1 LM21305 Overview
  3. 2 Typical Application Circuit
  4. 3 Evaluation Board Schematic
  5. 4 Evaluation Board Bill of Materials (BOM)
  6. 5 Connection Descriptions
  7. 6 Jumper Settings
  8. 7 Other Design Examples
  9. 8 Typical Performance Characteristics
  10. 9 Component Selection
    1. 9.1 Input Capacitors
    2. 9.2 AVIN Filter
    3. 9.3 Switching Frequency Selection
    4. 9.4 Inductor
    5. 9.5 Output Capacitor
    6. 9.6 Compensation Circuit
  11. 10PCB Layout
  12. 11Revision History

4 Evaluation Board Bill of Materials (BOM)

Table 4-1 Board Bill of Materials (BOM)
ComponentDescriptionManufacturerManufacturer Part NumberPackage
C1CERAMIC 100 pF 25 V NPOAVX06033A101KAT2A0603
C2,C7CERAMIC 0.1 µF 16 V X7RTDKC1608X7R1C104M0603
C3,C4CERAMIC 1.0 µF 25 V X7RTDKC1608X7R1E105M0603
C5N/AN/AN/AN/A
C6CERAMIC 4.7 nF 50 V X7RTDKC1608X7R1H472J0603
C8CERAMIC 1.0 µF 25 V X7RTDKC3216X7R1E105K1206
C9, C10CERAMIC 10 µF 25 V X5RTDKC3225X5R1E106K1210
C11, C12CERAMIC 47 µF 10 V X5RTDKC3225X5R1A476M1210
C13TANT 47 µF 25 VKemetT495X476K025ATE150CASE D
C14, C15N/AN/AN/AN/A
D1N/AN/AN/AN/A
L13.3 µH 9.0 A SMDWurth Electronics744314330SMD
LD1LED GREENCMLCMDA5CG7D1Z0805
R3, R610 kΩ 0603 1%YageoRC0603FR-710KL0603
R2249Ω 0603 1%YageoRC0603FR-07249RL0603
R1, R4100 kΩ 0603 1%YageoRC0603FR-07100KL0603
R545.3 kΩ 0603 1%YageoRC0603FR-0745K3L0603
R77.15 kΩ 0603 1%YageoRC0603FR-077K15RL0603
R81 Ω 0603 1%YageoRC0603FR-071RL0603
U1LM21305 Buck RegulatorTexas InstrumentsLM21305WQFN-28
U2IC BUFF NON-INVFairchildNC7SZ125M5XSOT23-5