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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Qty. RoHS ECAD Model Topology
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Output Voltage
Output Current
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ROHM Semiconductor Switching Controllers PWM Type DC/DC Converter IC Included a Switching MOSFET
Datasheet
5.810In Stock
Min.: 1
Mult.: 1

Buck 1 Output 70 kHz 82 % 8.9 V to 26 V 10.4 A - 40 C + 105 C Through Hole DIP-7 Tube
Torex Semiconductor Switching Controllers 16V Input Step-Down DCDC Controller
Datasheet
2.944In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

Buck 1 Output 1 MHz 100 % Adjustable 3 A - 40 C + 85 C SMD/SMT SOT-25-5 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers N-CH FET Sync Buck R eg Cntlr A 926-LM27 A 926-LM2727MTCX/NOPB
Datasheet
558In Stock
Min.: 1
Mult.: 1

Buck 1 Output 2 MHz 90 % 600 mV to 5 V 20 A 0 C + 125 C SMD/SMT TSSOP-14 Tube
Texas Instruments Switching Controllers Current-Mode PWM Con troller ALT 595-UC3 ALT 595-UC3843AD8TR
Datasheet
Product Comments
2.104In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.500

Boost, Buck, Flyback, Forward 1 Output 500 kHz 100 % 200 mA 0 C + 70 C SMD/SMT SOIC-8 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Fixed-Freq Notebook Sys Pwr Controller D DISC-RESTRICTED-PART
Datasheet
440In Stock
MouseReel Available
Min.: 1
Mult.: 1

Buck 2 Output 200 kHz to 1 MHz 99 % 1 V to 12 V 20 A - 40 C + 85 C SMD/SMT WQFN-32 Reel, Cut Tape, MouseReel

Texas Instruments Switching Controllers Wide Vtg Range Buck- Boost Cntlr A 595-L A 595-LM25118Q1MHENOPB
Datasheet
218In Stock
Min.: 1
Mult.: 1

Boost, Buck 1 Output 500 kHz 80 % 1.23 V to 38 V 4 A - 40 C + 125 C SMD/SMT HTSSOP-20 AEC-Q100 Tube
onsemi NCP81172MNTXG
onsemi Switching Controllers 2/1-PHASE SYNC BUCK
Datasheet
2.076In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 4.000

Buck 2 Output 200 kHz to 800 kHz 100 % 2 V 2 mA - 40 C + 125 C SMD/SMT Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Automotive 80V 100 % duty cycle dual-c
Datasheet
1.872In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 1.001
: 2.500

Buck 2 Output 100 kHz to 2.5 MHz 100 % 4 V to 80 V 800 mV to 60 V - 40 C + 125 C SMD/SMT VQFN-36 Reel, Cut Tape, MouseReel
Diodes Incorporated Switching Controllers USB Std Power Range W-QFN4040-24/SWP(Type A1-B) T&R 3K
Datasheet
2.093In Stock
Min.: 1
Mult.: 1
Max.: 209
: 3.000

Buck 1 Output 440 kHz 95 % 4 V to 36 V 5 V to 28 V 3 A - 40 C + 125 C SMD/SMT WQFN-24 Reel, Cut Tape

Renesas / Intersil Switching Controllers ISL78264ARZ AUTOMOTIVE GRADE - Dual Sync Buck controller 5x
Datasheet
220In Stock
Min.: 1
Mult.: 1
: 250

Buck 2 Output 200 kHz to 2.2 MHz 98.75 % 3.25 V to 5 V - 40 C + 125 C SMD/SMT WFQFN-32 AEC-Q100 Reel, Cut Tape
Texas Instruments Switching Controllers High Speed Vltg Mode A 595-UCC35705DTR A A 595-UCC35705DTR
Datasheet
598In Stock
Min.: 1
Mult.: 1

Boost, Buck, Flyback, Forward 1 Output 4 MHz 93 % 8.8 V 20 mA 0 C + 70 C SMD/SMT SOIC-8 Tube

Texas Instruments Switching Controllers BiCMOS Low-Power Cur rent Mode A 595-UCC A 595-UCC38C40DGKR
Datasheet
371In Stock
Min.: 1
Mult.: 1

Boost, Buck, Flyback, Forward 1 Output 1 MHz 100 % 18 V 1 A 0 C + 70 C SMD/SMT VSSOP-8 Tube
RECOM Power Switching Controllers Vin Vout mA Flyback MSOP-10
Datasheet
30In Stock
70Expected 8/17/2026
Min.: 1
Mult.: 1

Buck, Boost, Flyback 1 Output 500 kHz 85 % 4 V to 100 V - 40 C + 125 C SMD/SMT MSOP-10
Texas Instruments Switching Controllers 42V 100% duty-cycle capable dual-channe
Datasheet
513In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2.500

Buck 2 Output 100 kHz to 2.2 MHz 100 % 4 V to 42 V 800 mV to 36 V - 40 C + 150 C SMD/SMT VQFN-36 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Automotive 42-V sync hronous buck DC/DC
Datasheet
5.959In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 1.001
: 3.000

Buck 1 Output 2.2 MHz 100 % 3.5 V to 42 V 800 mV to 36 V - 40 C + 150 C SMD/SMT VQFN-24 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Automotive 80V sync hronous buck DC/DC c
Datasheet
2.319In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 1.001
: 3.000

Buck 1 Output 2.2 MHz 99 % 3.5 V to 80 V 800 mV to 55 V 20 A - 40 C + 125 C SMD/SMT VQFN-19 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Automotive 36V 1A 50 0KHz current mode
Datasheet
2.340In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 1.001
: 2.500

Boost, Buck, Flyback 1 Output 500 kHz 100 % 10 V 4.95 V to 5.05 V 1 A - 40 C + 125 C SMD/SMT SOIC-8 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Wide Inp Non-Sync Buck DC/DC Cntrlr
Datasheet
218In Stock
Min.: 1
Mult.: 1

Buck 1 Output 35 kHz to 500 kHz 100 % 700 mV to 46 V 3 A - 55 C + 210 C SMD/SMT CFP-8 Tube
Texas Instruments Switching Controllers 36V 1A 500KHz curr e nt mode PWM control
Datasheet
2.471In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 1.001
: 2.500

Boost, Buck, Flyback 2 Output 500 kHz 100 % 4.95 V to 5.05 V 1 A - 40 C + 125 C SMD/SMT SOIC-8 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers 36V 1A 500KHz curr e nt mode PWM control
Datasheet
2.153In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 1.001
: 2.500

Boost, Buck, Flyback 2 Output 500 kHz 100 % 4.95 V to 5.05 V 1 A - 40 C + 125 C SMD/SMT SOIC-8 Reel, Cut Tape, MouseReel
Diodes Incorporated Switching Controllers USB Std Power Range W-QFN4040-24(Type A1) T&R 3K
Datasheet
2.135In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 214
: 3.000

Buck 1 Output 440 kHz 95 % 4 V to 36 V 1 V to 28 V 3 A - 40 C + 150 C SMD/SMT W-QFN4040-24 Reel, Cut Tape, MouseReel
Analog Devices Switching Controllers 2-Phase Sync Boost CTL, 40V, 3MHz
Datasheet
525In Stock
Min.: 1
Mult.: 1

Boost, Buck 1 Output 3 MHz 100 % 40 V - 40 C + 150 C SMD/SMT QFN-28 Tube
Texas Instruments Switching Controllers Automotive 42-V sync hronous buck DC/DC
Datasheet
1.067In Stock
9.000On Order
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

Buck 1 Output 2.2 MHz 100 % 800 mV to 36 V 20 A - 40 C + 150 C SMD/SMT VQFN-24 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers Automotive 80-V syn chronous buck DC/DC
Datasheet
1.337In Stock
6.000Expected 12/31/2026
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

Buck 1 Output 2.2 MHz 100 % 800 mV to 55 V 20 A - 40 C + 125 C SMD/SMT VQFN-24 Reel, Cut Tape, MouseReel
Texas Instruments Switching Controllers 3.5-V to 80-V curre nt mode synchronous
Datasheet
8.464In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3.000

Buck 1 Output 2.2 MHz 100 % 800 mV to 55 V - 40 C + 125 C SMD/SMT VQFN-24 Reel, Cut Tape, MouseReel