Buck Converters for Power Over Ethernet

A buck converter is a power efficient voltage step-down converter that changes a higher voltage to a lower voltage. Whereas a linear regulator can achieve the same purpose, regulators can waste more energy via conversion of excess energy to heat. For this reason, a buck DC/DC converter is the preferred choice for power-efficient designs. A DC/DC boost converter, also known as a step-up converter, is a semiconductor device or electrical circuit that has an output DC voltage that is greater than the DC input voltage.

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Description Datasheet Availability Pricing (EUR) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model Topology
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Texas Instruments Switching Controllers 42V On-Time PFET Buc k Switch Cntlr A 92 A 926-LM25085MYE/NOPB
Datasheet
11.000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 1.000

Buck 1 Output 1 MHz 100 % 1.25 V to 42 V 1.75 A - 40 C + 125 C SMD/SMT MSOP-PowerPad-8 Reel, Cut Tape, MouseReel

Texas Instruments Switching Controllers 4.5-42V Wide Vin Co nstant On-Time Non-S A 926-LM25085MYE/NOPB
Datasheet
13.083On Order
MouseReel Available
Min.: 1
Mult.: 1
: 3.500

Buck 1 Output 1 MHz 100 % 1.25 V to 42 V 1.75 A - 40 C + 125 C SMD/SMT MSOP-PowerPad-8 Reel, Cut Tape, MouseReel

Texas Instruments Switching Controllers Sync Buck Controller A 926-LM5116MHX/NOP A 926-LM5116MHX/NOPB
Datasheet
20.250On Order
Min.: 1
Mult.: 1

Buck 1 Output 50 kHz to 1 MHz 98 % 1.215 V to 80 V 20 A - 40 C + 150 C SMD/SMT HTSSOP-20 Tube
Texas Instruments Switching Controllers Current-Mode PWM Con troller A 595-UC384 A 595-UC3843AD8
Datasheet
4.129In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.500

Boost, Buck, Flyback, Forward 1 Output 500 kHz 100 % 5 V 200 mA 0 C + 70 C SMD/SMT SOIC-8 Reel, Cut Tape, MouseReel

STMicroelectronics Switching Controllers Voltage/Current Cont
Datasheet
7.500Expected 7/23/2027
MouseReel Available
Min.: 1
Mult.: 1
: 2.500

Buck 1 Output 70 kHz to 130 kHz 100 % Adjustable 80 mA - 40 C + 125 C SMD/SMT SOIC-14 Reel, Cut Tape, MouseReel
Analog Devices Switching Controllers 150V L IQ, 2x, 2-PhSync Buck DC/DC Cntr
Datasheet
500Expected 9/4/2026
Min.: 1
Mult.: 1
Max.: 500

Buck 2 Output 50 kHz to 750 kHz 100 % 1 V to 60 V 105 uA - 40 C + 125 C SMD/SMT LQFP-48 Tray
Texas Instruments Switching Controllers Wide Inp Non-Sync Bu ck DC/DC Cntrlr A 5 A 595-TPS40200DR
Datasheet
1.194Expected 9/7/2026
Min.: 1
Mult.: 1

Buck 1 Output 35 kHz to 500 kHz 95 % 700 mV to 46 V 3 A - 40 C + 85 C SMD/SMT SOIC-8 Tube
Texas Instruments Switching Controllers 3-20V Wide Input Syn c Buck Controller A A 595-TPS40303DRCT
Datasheet
2.966Expected 11/12/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

Buck 1 Output 300 kHz 90 % 600 mV to 18 V 10 A - 40 C + 125 C SMD/SMT VSON-10 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers MCM- Primary Side FB A 595-UCC28910D A 5 A 595-UCC28910D
Datasheet
4.982Expected 11/26/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2.500

Buck, Flyback 1 Output 115 kHz 99 % 5 V 1.26 A - 40 C + 125 C SMD/SMT SOIC-7 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers UCC28911: 700V Flyba ck Switcher A 595-U A 595-UCC28911D
Datasheet
4.961Expected 8/26/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2.500

Buck, Flyback 1 Output 115 kHz 99 % 5 V 1.2 A - 40 C + 125 C SMD/SMT SOIC-7 Reel, Cut Tape, MouseReel

Texas Instruments Switching Controllers 42V On-Time PFET Buc k Switch Cntlr A 92 A 926-LM25085MY/NOPB
Datasheet
4.772Expected 9/3/2026
MouseReel Available
Min.: 1
Mult.: 1
: 250

Buck 1 Output 1 MHz 100 % 1.25 V to 42 V 1.75 A - 40 C + 125 C SMD/SMT MSOP-PowerPad-8 Reel, Cut Tape, MouseReel

Texas Instruments Switching Controllers 75V Constant PFET Bu ck Switch Cntlr A 9 A 926-LM5085MYE/NOPB
Datasheet
519In Stock
4.000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 1.000

Buck 1 Output 1 MHz 100 % 1.25 V to 75 V 1.75 A - 40 C + 125 C SMD/SMT MSOP-PowerPad-8 Reel, Cut Tape, MouseReel
Monolithic Power Systems (MPS) Switching Controllers 4V-40V Input Current Mode Sync StpDwn Co
Datasheet
10.000Expected 10/19/2026
MouseReel Available
Min.: 1
Mult.: 1
: 5.000

Buck 1 Output 430 kHz 99.5 % 25 V 13.2 uA - 40 C + 125 C SMD/SMT QFN-20 Reel, Cut Tape, MouseReel
Monolithic Power Systems (MPS) Switching Controllers 4V-60V Input, Current Mode,Synchronous Step-Down Controller
Datasheet
4.844Expected 9/2/2026
MouseReel Available
Min.: 1
Mult.: 1
: 5.000

Buck 1 Output 300 kHz 99.5 % 24 V - 40 C + 125 C SMD/SMT QFN-20 Reel, Cut Tape, MouseReel
Microchip Technology Switching Controllers Monolithic SMPS Controller
Datasheet
299Expected 9/3/2026
Min.: 1
Mult.: 1

Boost, Buck, Flyback, Forward 1 Output 500 kHz 96 % 5 V 500 mA - 40 C + 85 C Through Hole DIP-8 Tube
Analog Devices Switching Controllers 1MHz Off-Line C Mode PWM & DC/DC Conv
Datasheet
100Expected 9/1/2026
Min.: 1
Mult.: 1
Max.: 100

Buck 1 Output 1 MHz 100 % 5 V 1 A 0 C + 100 C SMD/SMT SOIC-8 Tube
Analog Devices Switching Controllers L IQ , 60V, Hi Freq Sync Buck Cntr
Datasheet
91Expected 9/25/2026
Min.: 1
Mult.: 1

Buck 1 Output 320 kHz to 2.25 MHz 98 % 800 mV to 24 V 20 A - 40 C + 150 C SMD/SMT QFN-20 Tube
Texas Instruments Switching Controllers High Speed PWM Contr oller
Datasheet
50Expected 12/28/2026
Min.: 1
Mult.: 1

Boost, Buck, Flyback, Forward 1 Output 1 MHz 100 % 5.1 V 2 A 0 C + 70 C Through Hole PDIP-16 Tube
Texas Instruments Switching Controllers 700V Flyback Switche r A 595-UCC28910DR A 595-UCC28910DR
Datasheet
975Expected 12/3/2026
Min.: 1
Mult.: 1

Buck, Flyback 1 Output 115 kHz 99 % 5 V 1.26 A - 40 C + 125 C SMD/SMT SOIC-7 Tube
Analog Devices / Maxim Integrated Switching Controllers High-Efficiency, 10-Pin MAX, Step-Down Controllers for Notebooks
Datasheet
80Expected 10/5/2026
Min.: 1
Mult.: 1
Max.: 80

Buck 1 Output 300 kHz 100 % 500 mV to 5.5 V 2 A - 40 C + 85 C SMD/SMT UMAX-10 Tube
Richtek Switching Controllers 12V Green Voltage Mode High Efficiency Synchronous Buck PWM Controller
Datasheet
1.500Expected 10/15/2026
Min.: 1
Mult.: 1
: 1.500

Buck 2 Output 300 kHz 85 % 5 V to 12 V 1.5 A - 40 C + 85 C SMD/SMT WDFN-10 Reel, Cut Tape
Microchip Technology Switching Controllers Digitally enhanced power analog buck controller
Datasheet
Non-Stocked Lead-Time 11 Weeks
Min.: 1
Mult.: 1

Buck 1 Output 100 kHz to 1.6 MHz 100 % 300 mV to 16 V 4 A - 40 C + 125 C SMD/SMT QFN-28 Tube
Texas Instruments Switching Controllers Low Iq Wide Input R ange Synchronous Buc A 595-LM25141RGET
Datasheet
Non-Stocked Lead-Time 9 Weeks
Min.: 3.000
Mult.: 3.000
: 3.000

Buck 1 Output 440 kHz, 2.2 MHz 99 % 3.3 V, 5 V, 1.5 V to 15 V 20 A - 40 C + 125 C SMD/SMT VQFN-24 Reel
Texas Instruments Switching Controllers High Perf Sync Buck Controller A 595-LM2 A 595-LM27403SQE/NOPB
Datasheet
Non-Stocked Lead-Time 9 Weeks
Min.: 4.500
Mult.: 4.500
: 4.500

Buck 1 Output 1.05 MHz 93 % 4.7 V - 40 C + 125 C SMD/SMT WQFN-24 Reel
Texas Instruments Switching Controllers Dual-Ch PWM Control Circuit A 595-TL1454 A 595-TL1454ACPWR
Datasheet
Non-Stocked Lead-Time 9 Weeks
Min.: 270
Mult.: 90

Buck, Flyback 2 Output 2 MHz 100 % 20 V 40 mA - 20 C + 85 C SMD/SMT TSSOP-16 Tube