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LM5145 Datasheet(PDF) 52 Page - Texas Instruments

Part # LM5145
Description  LM25137 4V to 42V, 100% Duty Cycle Capable, Dual-Channel, Synchronous Buck DC/DC Controller
PDF  73 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM5145 Datasheet(HTML) 52 Page - Texas Instruments

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Resistor RRT of 57.6kΩ sets the switching frequency at 400kHz. In terms of control loop performance, the target
loop crossover frequency is 60kHz with a phase margin greater than 50°. An RSS resistance of 20kΩ sets the
output voltage soft-start time to 4.5ms.
the following table cites the selected buck regulator powertrain components, with many of the components
available from multiple vendors. This design uses 40V logic-level MOSFETs, shielded buck inductors, shunt
resistors with wide aspect ratio for low ESL, 50V-rated ceramic input capacitors and 25V-rated ceramic output
capacitors.
Table 8-7. List of Materials for Application Circuit 3
REFERENCE
DESIGNATOR
QTY
SPECIFICATION(1)
MANUFACTURER
PART NUMBER
CIN1, CIN2
8
10µF, 50V, X7R, 1210, ceramic
TDK
CNA6P1X7R1H106K
10µF, 50V, X7S, 1210, ceramic
Murata
GCM32EC71H106K
COUT1, COUT2
8
22µF, 25V, X7R, 1210, ceramic
TDK
CGA6P3X7R1E226M250
22µF, 25V, X7S, 1210, ceramic
Murata
GCM32EC71E226KE36
LO1, LO2
2
3.3µH, 6.2mΩ, 19A, 10.85 × 10 × 5.2mm
Cyntec
VCHA105D-3R3MS6
3.3µH, 6.2mΩ, 20A, 11 × 10 × 5.1mm
Bourns
SRP1050WA-3R3M
3.3µH, 6mΩ, 28.6A, 10.5 × 10 × 6.5mm
TDK
SPM10065VT-3R3M-D
3.3µH, 9.23mΩ, 16A, 10.8 × 10 × 5mm
Eaton
HCM1A1105V2-3R3-R
3.3µH, 9.9mΩ, 22.1A, 10.85 × 10 × 3.8mm
Würth Electronik
784373680033
Q1, Q2,Q3, Q4
4
40V, 3.6mΩ, 9nC, SON 5 × 6
Infineon
IAUCN04S7L028ATMA1
RS1, RS2
2
Shunt, 3mΩ ±1%, ±50ppm/°C, 0612 wide aspect ratio, 1.5W
Susumu
KRL3216E-C-R003-F
U1
1
LM25137 42V two-phase synchronous buck controller
Texas Instruments
LM25137RHAR
8.2.3.2 Detailed Design Procedure
See Section 8.2.1.2.
LM25137
SNVSCU4 – OCTOBER 2025
www.ti.com
52
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Product Folder Links: LM25137



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