LM5145 datasheet(40/60 Pages) TI2

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7.2.2.1 Design Requirements

The following table shows the intended input, output, and performance parameters for this design example.

Table 7-4. Design Parameters

DESIGN PARAMETER

VALUE

Input voltage range (steady-state)

8V to 36V

Minimum input voltage

5.5V

Maximum input voltage

36V

Output voltage

3.3V

Output current

12A

Switching frequency

440kHz

Output voltage regulation

±1%

Soft-start time

3ms

The switching frequency is set at 440kHz by resistor RT. Table 7-5 lists the selected buck regulator powertrain

components, 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 7.1.1.4.

Table 7-5. List of Materials for Application Circuit 2

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER

PART NUMBER

CIN

10µF, 50V, X7R, 1210, ceramic

AVX

12105C106K4Z2A

47µF, 10V, X7R, 1210, ceramic

Murata

GRM32ER71A476KE15L

1.5µH, 2.91mΩ, 32A, 8.8 × 8.3 × 7.8mm

Würth Elektronik

74439358015

3mΩ ±1% 1W shunt, 0508, AEC-Q200

Susumu

KRL2012E-M-R003F-T5

Q1, Q2

40V, 4.6mΩ, 7nC, SON 5 × 6

Infineon

IAUC60N04S6L039

LM25139 synchronous buck controller

Texas Instruments

LM25139RGTR

7.2.2.2 Detailed Design Procedure

See Section 7.2.1.2.

LM25139

SLVSJ80 – OCTOBER 2025

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