LM5145 datasheet(42/66 Pages) TI2

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The selected buck converter powertrain components are cited in Table 9-8, including power MOSFETs,

buck inductor, input and output capacitors, and ICs. Using the LM5146 Quickstart Calculator, compensation

components are selected based on a target loop crossover frequency of 40 kHz and phase margin greater than

55°. The output voltage soft-start time is 6 ms based on the selected soft-start capacitance, CSS, of 47 nF.

Table 9-8. List of Materials for Application Circuit 2

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER

PART NUMBER

CIN

2.2 µF, 100 V, X7R, 1210, ceramic

TDK

CGA6N3X7R2A225K

Taiyo Yuden

HMK325B7225KM-P

2.2 µF, 100 V, X7S, 1206, ceramic

Murata

GCM31CC72A225KE02

COUT

22 µF, 25 V, X7R, 1210, ceramic

TDK

CGA6P3X7R1E226M

Murata

GCM32EC71E226KE36

Taiyo Yuden

TMK325B7226KMHT

6.8 µH, 12 mΩ, 13.3 A, 10.85 × 10.0 × 5.2 mm

Cyntec

VCHA105D-6R8MS6

6.8 µH, 13.3 mΩ, 21.4 A, 10.5 × 10.0 × 6.5 mm

TDK

SPM10065VT-6R8M-D

100 V, 22 mΩ, MOSFET, SON 5 × 6

Onsemi

NVMFS6B25NLT1G

100 V, 10 mΩ, MOSFET, SON 5 × 6

Onsemi

NVMFS6B14NLT1G

Wide VIN synchronous buck controller

Texas Instruments

LM5146RGYR

As shown in Figure 9-16, a 2.2-Ω resistor in series with CBST is used to slow the turn-on transition of the high-

side MOSFET, reducing the spike amplitude and ringing of the SW node voltage and minimizing the possibility of

Cdv/dt-induced shoot-through of the low-side MOSFET. If needed, place an RC snubber (for example, 2.2 Ω and

100 pF) close to the drain (SW node) and source (PGND) terminals of the low-side MOSFET to further attenuate

any SW node voltage overshoot and/or ringing. Please refer to the application note Reduce Buck Converter EMI

and Voltage Stress by Minimizing Inductive Parasitics for more detail.

LM5146

SNVSBV0A – JUNE 2021 – REVISED JUNE 2021

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