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Power Circuits / Switching Regulator or Controllers / L4981BD
Datasheets
L4981BD by:
STMicroelectronics
Honest Han
SGS Semiconductor Ltd
STMicroelectronics
Not Found

L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode

Part Details for L4981BD by STMicroelectronics

Results Overview of L4981BD by STMicroelectronics

Tip: Data for a part may vary between manufacturers. You can filter for manufacturers on the top of the page next to the part image and part number.

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L4981BD Information

L4981BD by STMicroelectronics is a Switching Regulator or Controller.
Switching Regulator or Controllers are under the broader part category of Power Circuits.

A power circuit delivers electricity in order to operate a load for an electronic device. Power circuits include transformers, generators and switches. Read more about Power Circuits on our Power Circuits part category page.

Price & Stock for L4981BD

Part # Distributor Description Stock Price Buy
DISTI # 24M4229
Newark Power Factor Corrector, Soic-20, Pfc Mode Of Operation:Continuous Conduction Mode, Control Mode:Av... erage Current, Frequency Mode:Variable, Supply Voltage Min:18V, Supply Voltage Max:19.5V, Ic Case/Package:Soic, No. Of Pins:20Pins Rohs Compliant: Yes |Stmicroelectronics L4981BD more RoHS: Compliant Min Qty: 1 Package Multiple: 1 Date Code: 1 Container: Bulk 2231
  • 1 $2.6900
  • 10 $1.7700
  • 25 $1.7200
  • 50 $1.6800
  • 100 $1.6300
  • 250 $1.5500
  • 500 $1.5000
$1.5000 / $2.6900 Buy Now
DISTI # 497-5338-5-ND
DigiKey IC PFC CTR AVER CURR 100KHZ 20SO Min Qty: 1 Lead time: 25 Weeks Container: Tube 748
In Stock
  • 1 $2.6900
  • 10 $2.0040
  • 40 $1.7608
  • 120 $1.6251
  • 280 $1.5455
  • 520 $1.4982
  • 1,000 $1.4564
  • 2,520 $1.4091
  • 5,000 $1.3811
$1.3811 / $2.6900 Buy Now
DISTI # L4981BD
Avnet Americas PFC Controller IC, Continuous Conduction Mode, 12 V to 19.5 V, 100 kHz, 20 Pins, SOIC - Rail/Tube (A... lt: L4981BD) more RoHS: Compliant Min Qty: 1000 Package Multiple: 1000 Lead time: 25 Weeks, 0 Days Container: Tube 0
  • 1,000 $1.2965
  • 2,000 $1.2883
  • 4,000 $1.2644
  • 6,000 $1.2415
  • 8,000 $1.2193
$1.2193 / $1.2965 Buy Now
DISTI # 511-L4981BD
Mouser Electronics Power Factor Correction - PFC Very High Power RoHS: Compliant 1653
  • 1 $2.6900
  • 10 $2.0100
  • 25 $1.7400
  • 100 $1.6100
  • 250 $1.5400
  • 500 $1.5000
  • 1,000 $1.4900
  • 2,000 $1.3900
  • 5,000 $1.3600
$1.3600 / $2.6900 Buy Now
DISTI # E02:0323_00207157
Arrow Electronics Power Factor Correction and PWM Controller 0.3mA 115kHz 20-Pin SO Tube RoHS: Compliant Min Qty: 1 Package Multiple: 1 Lead time: 25 Weeks Date Code: 2508 Europe - 1325
  • 1 $2.7493
  • 10 $1.9965
  • 25 $1.7646
  • 100 $1.6309
  • 250 $1.4767
  • 500 $1.4208
  • 1,000 $1.4041
$1.4041 / $2.7493 Buy Now
STMicroelectronics L4981A: Fixed Frequency Average Current Mode, L4981B: Line Modulated Frequency Average Current Mode RoHS: Compliant Min Qty: 1 1653
  • 1 $2.6400
  • 10 $1.9700
  • 25 $1.5600
  • 100 $1.4800
  • 250 $1.4400
  • 500 $1.4000
$1.4000 / $2.6400 Buy Now
DISTI # 7946454
Verical Power Factor Correction and PWM Controller 0.3mA 115kHz 20-Pin SO Tube RoHS: Compliant Min Qty: 4 Package Multiple: 1 Americas - 1324
  • 4 $2.7213
  • 10 $1.9761
  • 25 $1.7466
  • 100 $1.6143
  • 250 $1.4616
  • 500 $1.4063
  • 1,000 $1.3898
$1.3898 / $2.7213 Buy Now
DISTI # L4981BD
TME IC: driver, boost, PFC controller,SMPS controller, SO20, 100kHz Min Qty: 1 225
  • 1 $3.3400
  • 3 $3.0100
  • 10 $2.6600
  • 40 $2.3900
$2.3900 / $3.3400 Buy Now
DISTI # L4981BD
Avnet Silica PFC Controller IC Continuous Conduction Mode 12 V to 195 V 100 kHz 20 Pins SOIC (Alt: L4981BD) RoHS: Compliant Min Qty: 40 Package Multiple: 40 Lead time: 17 Weeks, 0 Days Silica - 7920
Buy Now
DISTI # L4981BD
Avnet Silica Amplifier Kit Includes 18 Operational Amplifier 3 Comparator Product Portfolio Card (Alt: L4981BD) RoHS: Compliant Min Qty: 40 Package Multiple: 40 Lead time: 53 Weeks, 0 Days Silica - 0
Buy Now
DISTI # L4981BD
EBV Elektronik PFC Controller IC Continuous Conduction Mode 12 V to 195 V 100 kHz 20 Pins SOIC (Alt: L4981BD) RoHS: Compliant Min Qty: 40 Package Multiple: 40 Lead time: 26 Weeks, 0 Days EBV - 400
Buy Now
LCSC 100kHz 14.5V19.5V SOIC-20-300mil AC-DC Controllers and Regulators ROHS 6
  • 1 $2.3246
  • 10 $2.2680
  • 30 $2.2298
  • 100 $2.1915
$2.1915 / $2.3246 Buy Now
Vyrian Other Function Semiconductors 1386
RFQ
Win Source Electronics IC PFC CTRLR AVERAGE CURR 20SOIC 2370
  • 24 $2.1285
  • 58 $1.7465
  • 89 $1.6919
  • 123 $1.6374
  • 158 $1.5828
  • 212 $1.4190
$1.4190 / $2.1285 Buy Now

Part Details for L4981BD

L4981BD CAD Models

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L4981BD Part Data Attributes

Parametric Data
L4981BD STMicroelectronics
Buy Now Datasheet
Compare Parts:
L4981BD STMicroelectronics L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode
Select a part to compare:
Rohs Code Yes
Part Life Cycle Code Active
Ihs Manufacturer STMICROELECTRONICS
Part Package Code SOIC
Package Description SO-20
Pin Count 20
Reach Compliance Code compliant
ECCN Code EAR99
HTS Code 8542.39.00.01
Factory Lead Time 25 Weeks
Samacsys Manufacturer STMicroelectronics
Analog IC - Other Type POWER FACTOR CONTROLLER
Control Mode CURRENT-MODE
Control Technique PULSE WIDTH MODULATION
Input Voltage-Max 19.5 V
Input Voltage-Min 11 V
Input Voltage-Nom 18 V
JESD-30 Code R-PDSO-G20
JESD-609 Code e4
Length 12.8 mm
Moisture Sensitivity Level 3
Number of Functions 1
Number of Terminals 20
Operating Temperature-Max 125 °C
Operating Temperature-Min -40 °C
Output Current-Max 2 A
Package Body Material PLASTIC/EPOXY
Package Code SOP
Package Equivalence Code SOP20,.4
Package Shape RECTANGULAR
Package Style SMALL OUTLINE
Peak Reflow Temperature (Cel) 260
Qualification Status Not Qualified
Seated Height-Max 2.65 mm
Surface Mount YES
Switcher Configuration SINGLE
Switching Frequency-Max 115 kHz
Technology BCDMOS
Temperature Grade AUTOMOTIVE
Terminal Finish Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal Form GULL WING
Terminal Pitch 1.27 mm
Terminal Position DUAL
Time@Peak Reflow Temperature-Max (s) 30
Width 7.5 mm

Alternate Parts for L4981BD

This table gives cross-reference parts and alternative options found for L4981BD. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of L4981BD, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.

Part Number Manufacturer Composite Price Description Compare
L4981BD013TR STMicroelectronics $1.5446 L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode L4981BD vs L4981BD013TR
L4981AD STMicroelectronics $2.0125 L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode L4981BD vs L4981AD

L4981BD Related Parts

L4981BD Frequently Asked Questions (FAQ)

  • The L4981BD can handle input voltages up to 60V, but it's recommended to keep it below 50V for reliable operation.

  • The inductor value depends on the output voltage, output current, and switching frequency. A good starting point is to use the inductor value calculation formula provided in the datasheet, and then adjust based on the specific application requirements.

  • The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage. The recommended value is 10nF to 100nF, but it may need to be adjusted based on the specific application requirements and the value of the high-side MOSFET.

  • To ensure stability, make sure to follow the layout guidelines in the datasheet, use a low-ESR output capacitor, and add a small ceramic capacitor (e.g., 10nF) between the VCC pin and GND to filter out noise.

  • The L4981BD can deliver up to 5A of output current, but it's recommended to derate the output current based on the ambient temperature and the thermal design of the application.