LM5145 datasheet(51/70 Pages) TI

51 / 70 page

Note

A design with 3 or more phases is feasible when appropriately added phase-shifted clock signals are

available. For example, a 4-phase design requires 4 LM5148 controllers with 0°, 90°, 180° and 270°

external SYNC signals to achieve the ideal phase separation of 360° divided by the total number of

phases.

9.2.4.1 Design Requirements

Table 9-8 shows the intended input, output, and performance parameters for this design example.

Table 9-8. Design Parameters

DESIGN PARAMETER

VALUE

Input voltage range (steady-state)

8 V to 72 V

Min transient input voltage

4 V

Max transient input voltage

80 V

Output voltage

3.3 V

Output current

20 A

Switching frequency

400 kHz

Output voltage regulation

±1%

Standby current, no-load

44 µA

Shutdown current

4.6 µA

Soft-start time

3 ms

The switching frequency is set at 400 kHz by resistors RRT1 and RRT2. The selected buck regulator powertrain

components are cited in Table 9-9, 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 9.1.1.4.

Table 9-9. List of Materials for Application Circuit 4

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER

PART NUMBER

CIN

4.7 μF, 100 V, X7S, 1210, ceramic

Murata

GCM32DC72A475KE02L

TDK

CGA6M3X7S2A475K200

47 µF, 6.3 V, X7R, 1210, ceramic

Murata

GCM32ER70J476KE19L

47 µF, 10 V, X7S, 1210, ceramic

TDK

CGA6P1X7S1A476M250AC

100 µF, 6.3 V, X7S, 1210, ceramic

Murata

GRT32EC70J107ME13

LO1, LO2

2.2 μH, 4.5 mΩ, 32 A, 11.3 × 10 × 6 mm

Coilcraft

XKL1060-222MEC

2.2 μH, 4.3 mΩ, 12.5 A, 6.7 × 6.5 × 6.1 mm

Coilcraft

XGL6060-222MEC

2.2 µH, 6.5 mΩ, 10 A, 10 × 11 × 3.8 mm

Würth Electronik

74437368022

Q1, Q2, Q3, Q4

80 V, 8.8 mΩ, 25 nC, SON 5 × 6, AEC-Q101

onsemi

NVMFS6H848NLT1G

80 V, 9.6 mΩ, 22 nC, SON 5 × 6, AEC-Q101

Infineon

IAUC50N08S5L096

RS1, RS2

Shunt, 4 mΩ, 0508, 1 W

Susumu

KRL2012E-M-R004-F-T5

U1, U2

LM5148 80-V synchronous buck controller

Texas Instruments

LM5148RGYR

9.2.4.2 Detailed Design Procedure

See Section 9.2.1.2.

www.ti.com

LM5148

SNVSC01 – FEBRUARY 2023

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