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LM5145 Datasheet(PDF) 31 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) 31 Page - Texas Instruments

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7.2 Typical Applications
7.2.1 Design 1 – High Efficiency 1MHz Synchronous Buck Regulator
Figure 7-4 shows the schematic diagram of a single-output synchronous buck regulator with an output voltage
of 12V and a rated load current of 10A. In this example, the current limit is monitored across a sense resistor in
series with the output inductor. The switching frequency is set at 1MHz by resistor RT. The 12V output voltage is
set using a resistor divider.
FPWM/SYNC
AGND
PGND
VOUT
ISNS
LO
SW
HO
CBOOT
VIN
COMP
VCC
PG
EN
RT
LM25139
FB
R
T
R
COMP
C
COMP
C
VCC
C
BOOT
C
IN
C
OUT
R
S
L
O
V
IN = 15V...36V
V
OUT = 12V
I
OUT = 10A
Q
2
Q
1
7
22 F
1.5nF
2
10 F
20.5k
2.2 H
23.2k
4.7 F
3m
0.1 F
R
FBT
100k
R
FBB
7.15k
V
OUT
Figure 7-4. Application Circuit 1 With the LM25139 Buck Regulator at 1MHz
Note
This and subsequent design examples are provided herein to showcase the LM25139 controller
in several different applications. Depending on the source impedance of the input supply bus, an
electrolytic capacitor can be required at the input to provide stability, particularly at low input voltage
and high output current operating conditions. See also Section 7.3.
www.ti.com
LM25139
SLVSJ80 – OCTOBER 2025
Copyright © 2025 Texas Instruments Incorporated
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Product Folder Links: LM25139



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