SLVU479A October   2011  – August 2021 TPS54821

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Setpoint
      2. 1.3.2 Slow-Start Time
      3. 1.3.3 Track In
      4. 1.3.4 Adjustable UVLO
      5. 1.3.5 Input Voltage Rails
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Efficiency
    3. 2.3  Output Voltage Load Regulation
    4. 2.4  Output Voltage Line Regulation
    5. 2.5  Load Transients
    6. 2.6  Loop Characteristics
    7. 2.7  Output Voltage Ripple
    8. 2.8  Input Voltage Ripple
    9. 2.9  Powering Up
    10. 2.10 Pre-Bias Start-Up
    11. 2.11 Hiccup-Mode Current Limit
  4. 3Board Layout
    1. 3.1 Layout
  5. 4Schematic and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
  6. 5Revision History

4.2 Bill of Materials

Table 4-1 presents the bill of materials for the TPS54821EVM-049.

Table 4-1 TPS54821EVM-049 Bill of Materials
COUNTREFDESVALUEDESCRIPTIONSIZEPART NUMBERMFR
0C1OpenCapacitor, Ceramic1210StdStd
1C210 µFCapacitor, Ceramic, 25 V, X5R, 20%1210StdStd
0C3Capacitor, Ceramic0603StdStd
1C44.7 µFCapacitor, Ceramic, 25 V, X5R, 10%0805StdStd
1C50.1 µFCapacitor, Ceramic, 25 V, X5R, 10%0603StdStd
1C63900 pFCapacitor, Ceramic, 50 V, X7R, 10%0603StdStd
1C739 pFCapacitor, Ceramic, 50 V, COG, 10%0603StdStd
1C80.022 µFCapacitor, Ceramic, 25 V, X7R, 10%0603StdStd
2C9, C1047 µFCapacitor, Ceramic, 10 V, X5R, 10%1210StdStd
0C11470 pFCapacitor, Ceramic, 50 V, X7R, 10%0603StdStd
1J2ED555/2DSTerminal Block, 2-pin, 6-A, 3.5 mm0.27 × 0.25 inchED555/2DSOST
2J1, J4ED120/2DSTerminal Block, 2-pin, 15-A, 5.1 mm0.40 × 0.35 inchED120/2DSOST
4JP1, JP2,J3, J5PEC02SAANHeader, Male 2-pin, 100 mil spacing0.100 inch × 2PEC02SAANSullins
1L13.3 µHInductor, SMT, 10-A, 13.7 milliΩ0.400 × 0.453 inchIHLP4040DZER3R3M01Vishay
1R135.7 kResistor, Chip, 1/16W, 1%0603StdStd
1R28.06 kResistor, Chip, 1/16W, 1%0603StdStd
2R3, R4100 kResistor, Chip, 1/16W, 1%0603StdStd
1R54.64 kResistor, Chip, 1/16W, 1%0603StdStd
1R651.1Resistor, Chip, 1/16W, 1%0603StdStd
1R710.0 kResistor, Chip, 1/16W, 1%0603StdStd
1R82.21 kResistor, Chip, 1/16W, 1%0603StdStd
0R9, R10OpenResistor, Chip, 1/16W, 1%0603StdStd
4TP1, TP3, TP7, TP95000Test Point, Red, Thru Hole Color Keyed0.100 × 0.100 inch5000Keystone
6TP2, TP4, TP5, TP6, TP8, TP105001Test Point, Black, Thru Hole Color Keyed0.100 × 0.100 inch5001Keystone
1U1TPS54821RHLIC, 1.6V-17V Synchronous Buck PWM Converter with Integrated MOSFET3.5mm × 3.5mm QFN14TPS54821RHLTI
2—Shunt, 100-mil, Black0.100929950-003M
1—Label (see note 5)1.25 × 0.25 inchTHT-13-457-10Brady
1—PCB, 2.5” × 2.5” × 0.062”PWR049Any
Notes
  1. These assemblies are ESD sensitive, ESD precautions shall be observed.
  2. These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
  3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
  4. Ref designators marked with an asterisk (‘**’) cannot be substituted. All other components can be substituted with equivalent MFG's components.
  5. Install label in silkscreened box after final wash. Text shall be 8 pt font