LM5145 datasheet(37/55 Pages) TI

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9.2.1.1 Design Requirements

The intended input, output, and performance-related parameters pertinent to this design example are shown in

Table 9-5.

Table 9-5. Design Parameters

DESIGN PARAMETER

VALUE

Input voltage range (steady state)

8 V to 85 V

Input transient voltage (peak)

95 V

Output voltage and current

5 V, 12 A

Input voltage UVLO thresholds

8 V on, 7 V off

Switching frequency (SYNC in)

300 kHz

Output voltage regulation

±1%

Load transient peak voltage deviation

< 100 mV

9.2.1.2 Detailed Design Procedure

The design procedure for an LM5146 based regulator for a given application is streamlined by using the LM5146

Quickstart Calculator available as a free download, or by availing of TI's WEBENCH® Power Designer. Such

tools are complemented by the availability of LM5145 and LM5146-Q1 evaluation module (EVM) designs,

numerous PSPICE models, as well as several LM5146 reference designs populated in the TI Designs reference

design library.

The selected buck converter powertrain components are cited in Table 9-6, 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 9.1.2.4.

The current limit setpoint in this design is set at 19 A based on the resistor RILIM and the 6-mΩ RDS(on) of the

low-side MOSFET (typical at TJ = 25°C and VGS = 7.5 V). This design uses a low-DCR, metal-powder inductor,

and all-ceramic output capacitor implementation.

Table 9-6. List of Materials for Application Circuit 1

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER

PART NUMBER

CIN

4.7 µF, 100 V, X7S, 1210, ceramic

TDK

CGA6M3X7S2A475K200

Murata

GCM32DC72A475KE02L

Taiyo Yuden

HMK325C7475MMHPE

COUT

47 µF, 6.3 V, X7R, 1210, ceramic

Murata

GCM32ER70J476KE19L

Taiyo Yuden

JMK325B7476KMHTR

47 µF, 6.3 V, X7S, 1210, ceramic

TDK

CGA6P1X7S0J476M

3.3 µH, 6.25 mΩ, 19 A, 10.85 × 10.0 × 5.2 mm

Cyntec

VCHA105D-3R3M

3.3 µH, 5.8 mΩ, 28.6 A, 10.5 × 10.0 × 6.5 mm

TDK

SPM10065VTT-3R3M-D

3.3 µH, 6.0 mΩ, 17 A, 10.9 × 10.0 × 6.0 mm

Panasonic

ETQP6M3R3YLC

100 V, 22 mΩ, MOSFET, SON 5 × 6

Onsemi

NVMFS6B25NL

100 V, 6 mΩ, MOSFET, SON 5 × 6

Onsemi

FDWS86068-F085

Wide VIN synchronous buck controller

Texas Instruments

LM5146RGYR

9.2.1.3 Custom Design With WEBENCH® Tools

Click here to create a custom design using the LM5146 device with the WEBENCH® Power Designer.

1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.

2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.

3. Compare the generated design with other possible solutions from Texas Instruments.

www.ti.com

LM5146

SNVSBV0A – JUNE 2021 – REVISED JUNE 2021

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