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
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Texas Instruments Switching Controllers 4.5-75V Wide Vin Co nstant On-Time Non-S A 926-LM5085SD/NOPB
Datasheet
599In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 250

Buck 1 Output 1 MHz 100 % 1.25 V to 75 V 1.75 A - 40 C + 125 C SMD/SMT LLP-8 Reel, Cut Tape, MouseReel
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
Analog Devices Switching Controllers L IQ, 2x, 2-PhSync Buck Cntr
Datasheet
23In Stock
Min.: 1
Mult.: 1
Max.: 23

Buck 2 Output 400 kHz 99 % 800 mV to 10 V 25 A - 40 C + 85 C SMD/SMT SSOP-28 Tube

Analog Devices / Maxim Integrated Switching Controllers Small, Dual, High-Efficiency Buck Contro
Datasheet
51In Stock
Min.: 1
Mult.: 1
Max.: 51

Buck 2 Output 350 kHz 100 % 1.8 V, 2.5 V, 1 V to 5.5 V 600 mA - 40 C + 85 C SMD/SMT QSOP-16 Tube
Analog Devices Switching Controllers L IQ, 60V Sync Boost+Buck Cntr
Datasheet
70In Stock
Min.: 1
Mult.: 1
Max.: 70

Boost, Buck 2 Output 850 kHz 100 % 800 mV to 60 V 20 A - 40 C + 125 C SMD/SMT QFN-32 Tube
Analog Devices Switching Controllers L IQ, 2x, 2-PhSync Buck Cntr
Datasheet
85In Stock
Min.: 1
Mult.: 1
Max.: 104

Buck 2 Output 400 kHz 99 % 800 mV to 10 V 25 A - 40 C + 85 C SMD/SMT SSOP-28 Tube
Analog Devices Switching Controllers L IQ, 60V Sync Boost+Buck Cntr
Datasheet
6In Stock
Min.: 1
Mult.: 1
Max.: 6

Boost, Buck 2 Output 850 kHz 100 % 800 mV to 60 V 20 A - 40 C + 150 C SMD/SMT QFN-32 Tube
Analog Devices Switching Controllers L IQ, 2.25MHz, 3x Out, Buck/Buck/Boost S
Datasheet
30In Stock
Min.: 1
Mult.: 1
Max.: 30

Boost, Buck 3 Output 320 kHz to 2.25 MHz 100 % 800 mV to 60 V 25 A - 40 C + 150 C SMD/SMT QFN-38 Tube
Analog Devices Switching Controllers Bidirectional Synchronous 100V Buck/Boost Controller with Reverse Supply, Reverse Current and Fault Protection
Datasheet
6In Stock
Min.: 1
Mult.: 1
Max.: 6

Boost, Buck 1 Output 80 kHz to 600 kHz 95 % 100 V 40 A - 40 C + 125 C SMD/SMT TSSOP-38 Tube

Analog Devices / Maxim Integrated Switching Controllers Dual Step-Down Controllers with Saturati
Datasheet
58In Stock
Min.: 1
Mult.: 1
Max.: 58

Buck 2 Output 170 kHz to 620 kHz 100 % 700 mV to 5.5 V 7 A - 40 C + 85 C SMD/SMT TQFN-40 Tube

Analog Devices / Maxim Integrated Switching Controllers Adjustable-Output, Switch-Mode Current S
Datasheet
49In Stock
Min.: 1
Mult.: 1
Max.: 49

Buck 1 Output 500 kHz 100 % 2 V to 24 V 1 uA - 40 C + 85 C SMD/SMT QSOP-16 Tube

Analog Devices / Maxim Integrated Switching Controllers Interleaved High-Efficiency, Dual Power-
Datasheet
36In Stock
Min.: 1
Mult.: 1
Max.: 36

Buck 2 Output 500 kHz 99 % 3.3 V, 5 V, 1 V to 5.5 V 5 A - 40 C + 85 C SMD/SMT TQFN-28 Tube
Analog Devices / Maxim Integrated Switching Controllers Multi-Output, Low-Noise Power-Supply Con
Datasheet
25In Stock
Min.: 1
Mult.: 1
Max.: 25

Buck 2 Output 300 kHz 99 % 3.3 V, 5 V, 2.5 V to 5.5 V 1 A - 40 C + 85 C SMD/SMT SSOP-28 Tube

Analog Devices / Maxim Integrated Switching Controllers High-Speed Step-Down Controller for Note
Datasheet
97In Stock
Min.: 1
Mult.: 1
Max.: 97

Buck 1 Output 600 kHz 100 % 1 V to 5.5 V 3 A - 40 C + 85 C SMD/SMT QSOP-16 Tube

Analog Devices / Maxim Integrated Switching Controllers High-Efficiency, PWM, Step-Down DC-DC Co
Datasheet
153In Stock
Min.: 1
Mult.: 1
Max.: 153

Buck 1 Output 300 kHz 99 % 2.5 V to 5.5 V 10 A - 40 C + 85 C SMD/SMT QSOP-16 Tube
Analog Devices Switching Controllers Synch, StepDown DC/DC Cntr w/Volt trking
Datasheet
345In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 345

Buck 1 Output 1.5 MHz 90 % 600 mV to 18 V 25 A - 40 C + 125 C SMD/SMT LFCSP-20 Reel, Cut Tape, MouseReel
Analog Devices Switching Controllers PP, Hi Eff, Sync Buck Sw Reg
Datasheet
66In Stock
Min.: 1
Mult.: 1
Max.: 66

Buck 2 Output 300 kHz 99 % 1.26 V to 2.5 V 240 A 0 C + 70 C SMD/SMT SSOP-28 Tube
Analog Devices / Maxim Integrated Switching Controllers Dual-Synchronous Buck Controllers for Po
Datasheet
142In Stock
Min.: 1
Mult.: 1
Max.: 142

Buck 2 Output 200 kHz to 1.4 MHz 95 % 800 mV to 3.6 V 30 A - 40 C + 85 C SMD/SMT QSOP-28 Tube

Analog Devices / Maxim Integrated Switching Controllers High-Efficiency, 10A, PWM Internal-Switc
Datasheet
57In Stock
Min.: 1
Mult.: 1
Max.: 57

Buck 1 Output 250 kHz to 2.4 MHz 95 % 600 mV to 3.1 V 10 A - 40 C + 85 C SMD/SMT TQFN-32 Tube
Analog Devices Switching Controllers 40V Low IQ Dual Buck CTL w/ 3.3VOUT1
Datasheet
199In Stock
Min.: 1
Mult.: 1
Max.: 199

Buck 1 Output 100 kHz to 3 MHz 99 % 800 mV to 40 V 5 A - 40 C + 125 C SMD/SMT Tube
Analog Devices Switching Controllers L IQ , 60V, Hi Freq Sync Buck Cntr
Datasheet
159In Stock
Min.: 1
Mult.: 1
Max.: 159

Buck 1 Output 320 kHz to 2.25 MHz 98 % 800 mV to 24 V 20 A - 40 C + 125 C SMD/SMT QFN-20 Tube
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
Analog Devices / Maxim Integrated Switching Controllers Versatile Automotive 36V 2.2MHz Buck Controller with 3.5 A IQ
Datasheet
489In Stock
Min.: 1
Mult.: 1
Max.: 489

Buck 1 Output 220 kHz to 2.2 MHz 99 % 5 V, 1 V to 10 V 15 A - 40 C + 125 C SMD/SMT SWTQFN-EP-16 AEC-Q100 Tray
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
Analog Devices Switching Controllers 60V Sync 4-Switch Buck-Boost Cntr w/ SS
Datasheet
122In Stock
Min.: 1
Mult.: 1
Max.: 122

Boost, Buck 1 Output 630 kHz 95 % 0 V to 60 V 25 A - 40 C + 125 C SMD/SMT QFN-28 AEC-Q100 Tube