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LM5145 Datasheet(PDF) 52 Page - Texas Instruments

Part # LM5145
Description  LM5137 4V to 80V, 100% Duty Cycle Capable, Dual-Channel, Synchronous Buck DC/DC Controller
PDF  74 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.
Table 8-7 cites the selected buck regulator powertrain components, with many of the components available from
multiple vendors. This design uses 80V logic-level MOSFETs, shielded buck inductors, shunt resistors with wide
aspect ratio for low ESL, 100V-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
4.7µF, 100V, X7S, 1210, ceramic
TDK
CGA6M3X7S2A475K200
Murata
GCM32DC72A475KE02L
COUT1, COUT2
8
22µF, 25V, X7R, 1210, ceramic
TDK
CGA6P3X7R1E226M250
22µF, 25V, X7S, 1210, ceramic
Murata
GCM32EC71E226KE36
LO1, LO2
2
5.6µH, 10mΩ, 15A, 10.85 × 10 × 5.2mm
Cyntec
VCHW105D-5R6MS5
5.6µH, 14mΩ, 12A, 10.8 × 10 × 5mm
Eaton
HCM1A1105V2-5R6-R
5.6µH, 10.2mΩ, 16.2A, 11 × 10 × 5.1mm
Bourns
SRP1050WA-5R6M
4.7µH, 13.5mΩ, 16A, 10.85 × 10 × 3.8mm
Würth Electronik
784373680047
Q1, Q3
2
80V, 13.4mΩ, 8nC, SON 5 × 6
onsemi
NVMFS6H852NLT1G
Q2, Q4
2
80V, 6.2mΩ, 16nC, SON 5 × 6
onsemi
NVMFS6H836NLT1G
RS1, RS2
2
Shunt, 4mΩ ±1%, ±50ppm/°C, 0612 wide aspect ratio, 1.5W
Susumu
KRL3216E-C-R004-F
U1
1
LM5137 80V two-phase synchronous buck controller
Texas Instruments
LM5137RHAR
8.2.3.2 Detailed Design Procedure
See Section 8.2.1.2.
LM5137
SNVSCU3 – OCTOBER 2025
www.ti.com
52
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Product Folder Links: LM5137



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