LM5145 datasheet(32/60 Pages) TI2

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7.2.1.1 Design Requirements

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

Table 7-2. Design Parameters

DESIGN PARAMETER

VALUE

Input voltage range (steady-state)

15V to 36V

Minimum input voltage

15V

Maximum input voltage

36V

Output voltage

12V

Output current

10A

Switching frequency

1MHz

Output voltage regulation

±1%

Soft-start time

3ms

The switching frequency is set at 1MHz by resistor RT. In terms of control loop performance, the target loop

crossover frequency is 55kHz with a phase margin greater than 50°.

Table 7-3 cites 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. This design uses a low-DCR metal-powder composite inductor

and ceramic output capacitor implementation.

Table 7-3. List of Materials for Application Circuit 1

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER

PART NUMBER

CIN

10µF, 50V, X7R, 1210, ceramic

AVX

12105C106K4Z2A

22µF, 50V, X5R, ceramic

TDK

CKG57NX5R1H226M500JH

2.2µH, 4.3mΩ, 16A, 6.71 × 6.71 × 6.1mm

Coilcraft

XGL6060-222ME

3mΩ ±1% 1W Chip Resistor Wide 0805 (2012 Metric), 0508

Automotive AEC-Q200, Current Sense Metal Foil

Susumu

KRL2012E-M-R003F-T5

Q1, Q2

40V, 4.6mΩ, 7nC, SON 5 × 6

Infineon

IAUC60N04S6L039

LM25139 synchronous buck controller

Texas Instruments

LM25139RGTR

LM25139

SLVSJ80 – OCTOBER 2025

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