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LM5145 Datasheet(PDF) 32 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) 32 Page - Texas Instruments

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7.2.1.1 Design Requirements
The following table shows the intended input, output, and performance parameters for this design example.
Table 7-2. Design Parameters
DESIGN PARAMETER
VALUE
Input voltage range (steady-state)
15V to 36V
Minimum input voltage
15V
Maximum input voltage
36V
Output voltage
12V
Output current
10A
Switching frequency
1MHz
Output voltage regulation
±1%
Soft-start time
3ms
The switching frequency is set at 1MHz by resistor RT. In terms of control loop performance, the target loop
crossover frequency is 55kHz with a phase margin greater than 50°.
Table 7-3 cites 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. This design uses a low-DCR metal-powder composite inductor
and ceramic output capacitor implementation.
Table 7-3. List of Materials for Application Circuit 1
REFERENCE
DESIGNATOR
QTY
SPECIFICATION
MANUFACTURER
PART NUMBER
CIN
2
10µF, 50V, X7R, 1210, ceramic
AVX
12105C106K4Z2A
CO
7
22µF, 50V, X5R, ceramic
TDK
CKG57NX5R1H226M500JH
LO
1
2.2µH, 4.3mΩ, 16A, 6.71 × 6.71 × 6.1mm
Coilcraft
XGL6060-222ME
RS
3mΩ ±1% 1W Chip Resistor Wide 0805 (2012 Metric), 0508
Automotive AEC-Q200, Current Sense Metal Foil
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
LM25139
SLVSJ80 – OCTOBER 2025
www.ti.com
32
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Copyright © 2025 Texas Instruments Incorporated
Product Folder Links: LM25139



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