SLYA094 August   2025 LM5137F-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Hardware Design with LM5137F-Q1
    1. 2.1 Schematic
  6. 3PMP41158 Performance Curves
    1. 3.1 Four-Phase Interleaving
    2. 3.2 Thermal Performance
    3. 3.3 Load Transient
    4. 3.4 Light Load Efficiency
    5. 3.5 Bode Plot
  7. 4Reference Design Modification Conversion From 48V to 12V
  8. 5Summary
  9. 6References

4 Reference Design Modification Conversion From 48V to 12V

48V to 12V conversion is possible with this reference design, by making the following small modification to the board. Please refer to Figure 4-1 and Table 4-1 for modification required to obtain a 48V to 12V single output four phase buck converter.

Schematic Detail Modification To Reference Design To Achieve 48V to 12V Conversion Figure 4-1 Schematic Detail Modification To Reference Design To Achieve 48V to 12V Conversion
Table 4-1 BOM List Changes to Reference Design to Achieve 48V to 12V Conversion
Position Designator PN Remarks
Input filter C22,C23,C24,C25 CGA4J3X7S2A105K125AB 1uF/100V, 0805
C26 EEV-FK1K101Q 100uF/80V, H13
Input capacitor C20,C21,C5,C6,C7,C8,C10,C11,C13,C14,C15,C16 CGA6M3X7S2A475K200 4.7uF/100V, 1210
FET Q1,Q2,Q5,Q6 NVMFS6H852NLT1G 13.1mohm, 80V, QFN5*6
Q3,Q4,Q7,Q8 NVMFS6H836NLT1G 6.2mohm, 80V, QFN5*6
Inductor L2,L3,L4,L5 XGL1010-682MED 6.8uH
Output capacitor

C27,C28,C29,C32,C33,C34,C67,

C68,C69,C72,C73,C74

 GA6P3X7R1E226M250 22uF/25V, 1210
FB R13,R2 CRCW0603200KFKEA 200kΩ, 0603
R50,R3 CRCW060314K3FKEA 14.3kΩ, 0603
RT R19,R21 CRCW060376K8FKEA 76.8kΩ, 0603
EN R22 CRCW0603200KFKEA 200kΩ, 0603
R34 CRCW06037K15FKEA 7.15kΩ, 0603