LM5145 datasheet(35/70 Pages) TI

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9.2.1.1 Design Requirements

Table 9-2 shows the intended input, output, and performance parameters for this design example. Refer to the

LM25149-Q1EVM-2100 evaluation module.

Table 9-2. Design Parameters

DESIGN PARAMETER

VALUE

Input voltage range (steady state)

8 V to 18 V

Min transient input voltage

5.5 V

Max transient input voltage

36 V

Output voltage

5 V

Output current

8 A

Switching frequency

2.1 MHz

Output voltage regulation

±1%

Standby current, no-load

9.9 µA

Shutdown current

2.3 µA

Soft-start time

3 ms

The switching frequency is set at 2.1 MHz by resistor RRT. In terms of control loop performance, the target loop

crossover frequency is 60 kHz with a phase margin greater than 50°.

The selected buck regulator powertrain components are cited in Table 9-3, and many of the components are

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

power loss.. This design uses a low-DCR composite inductor, and ceramic output capacitors.

Table 9-3. List of Materials for Application Circuit 1

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER

PART NUMBER

CIN

10 µF, 50 V, X7S, 1210, ceramic

Taiyo Yuden

UMJ325KB7106KMHT

Murata

GCM32EC71H106KA03

TDK

CGA6P3X7S1H106K250AB

47 µF, 6.3 V, X7R, 1210, ceramic

Murata

GCM32ER70J476KE19L

Taiyo Yuden

JMK325B7476KMHTR

47 µF, 10 V, X7S, 1210, ceramic

TDK

CGA6P1X7S1A476M250AC

0.56 μH, 3.6 mΩ, 13 A, 6.6 × 6.6 × 4.8 mm

Würth Electronik

744373490056

0.68 µH, 2.9 mΩ, 22 A, 6.7 × 6.5 × 3.1 mm

Colicraft

XGL6030-681

40 V, 4.7 mΩ, 12 nC, SON 5 × 6

Texas Instruments

CSD18503Q5A

40 V, 2.7 mΩ, 35 nC, SON 5 × 6

Texas Instruments

CSD18511Q5A

Shunt, 5 mΩ, 0508, 1 W

Susumu

KRL2012E-M-R005-F-T5

LM5148 80-V synchronous buck controller

Texas Instruments

LM5148RGYR

www.ti.com

LM5148

SNVSC01 – FEBRUARY 2023

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