LM5145 datasheet(52/69 Pages) TI

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The selected buck regulator powertrain components are cited in Table 10-7, and many of the components are

available from multiple vendors. The MOSFETs in particular are chosen for both lowest conduction and switching

power loss, as discussed in detail in Section 10.1.1.4. This design uses a low-DCR composite inductor and

ceramic output capacitor implementation.

Table 10-7. List of Materials for Application Circuit 3

Ref Des

Qty

Specification

Manufacturer(1)

Part Number

CIN

10 µF, 50 V, X7R, 1210, ceramic

TDK

CNA6P1X7R1H106K

AVX

12105C106K4T2A

10 µF, 50 V, X7R, 1206, ceramic

TDK

CGA5L1X7R1H106K

47 µF, 6.3 V, X7R, 1210, ceramic

Murata

GCM32ER70J476KE19L

100 µF, 6.3 V, X7S, 1210, ceramic

Murata

GRT32EC70J107ME13L

CO(BULK)

220 µF, 10 V, 25 mΩ, 7343, polymer tantalum

Kemet

T598D227M010ATE025

AVX

TCQD227M010R0025E

LO1, LO2

1.5 µH, 1.28 mΩ, 46.7 A, 13.3 × 12.8 × 8 mm

Cyntec

VCUD128T-1R5MS8

1.5 µH, 2.3 mΩ, 35 A, 13.5 × 12.6 × 6.5 mm

Cyntec

VCMV136E-1R5MN2

1.5 µH, 2.8 mΩ, 32.8 A, 13 × 12.5 × 6.5 mm

TDK

SPM12565VT-1R5M-D

1.5 µH, 2.3 mΩ, 55.3 A, 13.5 × 12.5 × 6.2 mm

Würth Elektronik

744373965015

Q1, Q3

60 V, 11 mΩ, 4.5 nC, DFN5

Onsemi

NVMFS5C673NL

Q2, Q4

60 V, 2.6 mΩ, 24 nC, DFN5

Onsemi

NVMFS5C628NL

LM25143 42-V dual-channel/phase synchronous buck controller

Texas Instruments

LM25143RHAR

(1)

See the Third Party Products Disclaimer.

10.2.3.2 Detailed Design Procedure

See Section 10.2.1.2.

10.2.3.3 Application Curves

Load Currrent (A)

100

VIN = 24 V

Figure 10-25. Efficiency Versus IOUT

100

s/DIV

VOUT 0.5 V/DIV

IOUT 10 A/DIV

Figure 10-26. Load Transient, 0 A to 15 A

LM25143

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