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LM5145 Datasheet(PDF) 10 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) 10 Page - Texas Instruments

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5.6 Typical Characteristics
VIN = 12V, TJ = 25°C, unless otherwise stated.
Load Current (A)
0
1
2
3
4
5
6
7
8
9
10
11
12
75
80
85
90
95
100
Vin = 8V
Vin = 12V
Vin = 18V
See Section 7.2.2
VOUT = 3.3V
FSW = 440kHz
Figure 5-1. Efficiency vs Load, 3.3V Output, FPWM
Load Current (A)
0.001
0.01
0.1
1
10
50
60
70
80
90
100
Vin = 8V
Vin = 12V
Vin = 18V
See Section 7.2.2
VOUT = 3.3V
FSW = 440kHz
Figure 5-2. Efficiency vs Load, 3.3V Output, PFM
Output Current (A)
0
1
2
3
4
5
6
7
8
9
10
75
80
85
90
95
100
Vin = 24V
Vin = 36V
See Section 7.2.1
VOUT = 12V
FSW = 1MHz
Figure 5-3. Efficiency vs Load, 12V Output, FPWM
Output Current (A)
0.01
0.1
1
10
50
60
70
80
90
100
Vin = 24V
Vin = 36V
See Section 7.2.1
VOUT = 12V
FSW = 1MHz
Figure 5-4. Efficiency vs Load, 12V Output, PFM
VIN 2V/DIV
VOUT 1V/DIV
IOUT 5A/DIV
1ms/DIV
See Section 7.2.2
8A resistive load
Figure 5-5. Start-Up Characteristic
Vout 200mV/DIV
Iout 5A/DIV
100µs/DIV
IOUT = 0A to 10A
VOUT = 5V
2A/µs slew rate
Figure 5-6. Load Transient Response
LM25139
SLVSJ80 – OCTOBER 2025
www.ti.com
10
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Copyright © 2025 Texas Instruments Incorporated
Product Folder Links: LM25139



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