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LM5145 Datasheet(PDF) 40 Page - Texas Instruments

Part # LM5145
Description  LM25139 42V, Synchronous Buck DC/DC Controller With Dual Random Spread Spectrum for Advanced EMI Mitigation
PDF  60 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM5145 Datasheet(HTML) 40 Page - Texas Instruments

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7.2.2.1 Design Requirements
The following table shows the intended input, output, and performance parameters for this design example.
Table 7-4. Design Parameters
DESIGN PARAMETER
VALUE
Input voltage range (steady-state)
8V to 36V
Minimum input voltage
5.5V
Maximum input voltage
36V
Output voltage
3.3V
Output current
12A
Switching frequency
440kHz
Output voltage regulation
±1%
Soft-start time
3ms
The switching frequency is set at 440kHz by resistor RT. Table 7-5 lists 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.
Table 7-5. List of Materials for Application Circuit 2
REFERENCE
DESIGNATOR
QTY
SPECIFICATION
MANUFACTURER
PART NUMBER
CIN
2
10µF, 50V, X7R, 1210, ceramic
AVX
12105C106K4Z2A
CO
4
47µF, 10V, X7R, 1210, ceramic
Murata
GRM32ER71A476KE15L
LO
1
1.5µH, 2.91mΩ, 32A, 8.8 × 8.3 × 7.8mm
Würth Elektronik
74439358015
RS
1
3mΩ ±1% 1W shunt, 0508, AEC-Q200
Susumu
KRL2012E-M-R003F-T5
Q1, Q2
2
40V, 4.6mΩ, 7nC, SON 5 × 6
Infineon
IAUC60N04S6L039
U1
1
LM25139 synchronous buck controller
Texas Instruments
LM25139RGTR
7.2.2.2 Detailed Design Procedure
See Section 7.2.1.2.
LM25139
SLVSJ80 – OCTOBER 2025
www.ti.com
40
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Copyright © 2025 Texas Instruments Incorporated
Product Folder Links: LM25139



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