View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching Regulators

PMIC - Voltage Regulators - DC DC Switching Regulators

10,664 Products Found

Product list

1...164165166167168169170...214
Compare Image Part # Manufacturer Description Inventory ECAD Model RoHS Number of Outputs Output Configuration Topology Voltage - Output (Min/Fixed) Voltage - Output (Max) Synchronous Rectifier Voltage - Input (Min) Frequency - Switching Base Product Number Package Operating Temperature Series Mounting Type Voltage - Input (Max) Output Type Package / Case Supplier Device Package Function Current - Output Quantity
TPS54160ADRCR TPS54160ADRCR Texas Instruments IC REG BUCK ADJ 1.5A 10VSON In stock14280 pcs 1 Positive Buck 0.8V 58V No 3.5V 100kHz ~ 2.5MHz TPS54160 Tape & Reel (TR) -40°C ~ 150°C (TJ) Eco-Mode™ Surface Mount 60V Adjustable 10-VFDFN Exposed Pad 10-VSON (3x3) Step-Down 1.5A
TPS61200DRCTG4 TPS61200DRCTG4 Texas Instruments IC REG BOOST ADJ 1.2A 10VSON In stock8540 pcs 1 Positive Boost 1.8V 5.5V Yes 0.3V 1.25MHz ~ 1.65MHz TPS61200 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable 10-VFDFN Exposed Pad 10-VSON (3x3) Step-Up 1.2A (Switch)
AOZ1253PI AOZ1253PI Alpha & Omega Semiconductor Inc. IC REG BUCK ADJ 3A 8SO In stock4870 pcs 1 Positive Buck 0.6V 26V Yes 4.5V 620kHz - Tape & Reel (TR) -40°C ~ 85°C (TA) EZBuck™ Surface Mount 26V Adjustable 8-SOIC (0.154', 3.90mm Width) Exposed Pad 8-SO-EP Step-Down 3A
L4971D013TR L4971D013TR STMicroelectronics IC REG BUCK ADJ 1.5A 16SOIC In stock12243 pcs 1 Positive Buck 3.3V 50V No 8V 100kHz ~ 300kHz L4971 Tape & Reel (TR) -40°C ~ 150°C (TJ) - Surface Mount 55V Adjustable 16-SOIC (0.295', 7.50mm Width) 16-SO W Step-Down 1.5A
SC189LSKTRT SC189LSKTRT Semtech Corporation IC REG BUCK 1.8V 1.5A SOT23-5 In stock80510 pcs 1 Positive Buck 1.8V - Yes 2.9V 2.5MHz SC189 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 5.5V Fixed SC-74A, SOT-753 SOT-23-5 Step-Down 1.5A
MAX1830EEE+T MAX1830EEE+T Analog Devices Inc./Maxim Integrated IC REG BUCK ADJ/PROG 3A 16QSOP In stock5533 pcs 1 Positive Buck 1.1V (1.5V, 1.8V, 2.5V) 5.5V Yes 3V 1MHz MAX1830 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable (Programmable) 16-SSOP (0.154', 3.90mm Width) 16-QSOP Step-Down 3A
XC9236A30DMR-G XC9236A30DMR-G Torex Semiconductor Ltd IC REG BUCK 3V 600MA SOT25 In stock36390 pcs 1 Positive Buck 3V - Yes 2V 3MHz XC9236 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 6V Fixed SC-74A, SOT-753 SOT-25-5 Step-Down 600mA
AOZ2367QI-11 AOZ2367QI-11 Alpha & Omega Semiconductor Inc. IC REG BUCK ADJ 20A 28QFN In stock23468 pcs 1 Positive Buck 0.6V 20.4V Yes 4.5V 1MHz AOZ2367 Tape & Reel (TR) -40°C ~ 85°C (TA) EZBuck™ Surface Mount 24V Adjustable 28-PowerTFQFN 28-QFN (5x5) Step-Down 20A
LT1425IS#PBF LT1425IS#PBF Analog Devices Inc. IC REG FLYBACK 135MA 16SOIC In stock6502 pcs 1 Positive or Negative, Isolation Capable Flyback - - No 2.8V 285kHz LT1425 Tube -40°C ~ 100°C (TJ) - Surface Mount 20V - 16-SOIC (0.154', 3.90mm Width) 16-SO Step-Up/Step-Down 135mA (Switch)
LT1374IR#PBF LT1374IR#PBF Analog Devices Inc. IC REG BUCK SEPIC ADJ 4.5A D2PAK In stock4435 pcs 1 Positive Buck, SEPIC 2.42V 21.5V No 5V 500kHz LT1374 Tube -40°C ~ 125°C (TJ) - Surface Mount 25V Adjustable TO-263-8, D²Pak (7 Leads + Tab), TO-263CA 7-DDPAK Step-Down 4.5A (Switch)
LTC3548EDD#TRPBF LTC3548EDD#TRPBF Analog Devices Inc. IC REG BUCK BST ADJ DL 10DFN In stock9129 pcs 2 Positive Buck, Buck-Boost 0.6V 5V Yes 2.5V 2.25MHz LTC3548 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable 10-WFDFN Exposed Pad 10-DFN (3x3) Step-Down, Step-Up/Step-Down 400mA, 800mA
LT3480HMSE#PBF LT3480HMSE#PBF Analog Devices Inc. IC REG BUCK ADJUSTABLE 2A 10MSOP In stock5181 pcs 1 Positive Buck 0.79V 20V No 3.6V 200kHz ~ 2.4MHz LT3480 Tube -40°C ~ 150°C (TJ) - Surface Mount 36V Adjustable 10-TFSOP, 10-MSOP (0.118', 3.00mm Width) Exposed Pad 10-MSOP-EP Step-Down 2A
LTC3603IMSE#TRPBF LTC3603IMSE#TRPBF Analog Devices Inc. IC REG BUCK ADJ 2.5A 16MSOP In stock6954 pcs 1 Positive Buck 0.6V 14.5V Yes 4.5V 1MHz LTC3603 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 15V Adjustable 16-TFSOP (0.118", 3.00mm Width) Exposed Pad 16-MSOP-EP Step-Down 2.5A
LT1374CS8#TRPBF LT1374CS8#TRPBF Analog Devices Inc. IC REG BUCK SEPIC ADJ 4.5A 8SOIC In stock3443 pcs 1 Positive Buck, SEPIC 2.42V 21.5V No 5V 500kHz LT1374 Tape & Reel (TR) 0°C ~ 125°C (TJ) - Surface Mount 25V Adjustable 8-SOIC (0.154', 3.90mm Width) 8-SO Step-Down 4.5A (Switch)
MAX1536ETI+ MAX1536ETI+ Analog Devices Inc./Maxim Integrated IC REG BUCK ADJ 3.6A 28TQFN In stock4704 pcs 1 Positive Buck 0.7V 5.5V Yes 3V Up to 1.4MHz MAX1536 Tube -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable 28-WFQFN Exposed Pad 28-TQFN (5x5) Step-Down 3.6A
FAN53555BUC18X FAN53555BUC18X Fairchild Semiconductor SWITCHING REGULATOR, VOLTAGE-MOD In stock68630 pcs 1 Positive Buck 0.6V 1.23V Yes 2.5V 2.4MHz - Bulk -40°C ~ 85°C (TA) TinyBuck® Surface Mount 5.5V Programmable 20-UFBGA, WLCSP 20-WLCSP (1.96x1.56) Step-Down 5A
IR3846MTRPBF IR3846MTRPBF Infineon Technologies IC REG BUCK ADJ 35A 34PQFN In stock16090 pcs 1 Positive Buck 0.6V 18.06V Yes 1.5V 300kHz ~ 1.5MHz - Tape & Reel (TR) -40°C ~ 125°C (TJ) SupIRBuck® Surface Mount 21V Adjustable 34-PowerVFQFN 34-PQFN (5x7) Step-Down 35A
MAX1970EEE+T MAX1970EEE+T Analog Devices Inc./Maxim Integrated IC REG BUCK ADJ/PROG DL 16QSOP In stock3031 pcs 2 Positive Buck 1.2V (1.5V, 1.8V, 2.5V, 3.3V) 5.5V Yes 2.6V 1.4MHz MAX1970 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable (Programmable) 16-SSOP (0.154', 3.90mm Width) 16-QSOP Step-Down 750mA
LM2575HVT-ADJ/LF03 LM2575HVT-ADJ/LF03 Texas Instruments IC REG BUCK ADJ 1A TO220-5 In stock11218 pcs 1 Positive Buck 1.23V 57V No 4V 52kHz LM2575 Tube -40°C ~ 125°C (TJ) SIMPLE SWITCHER® Through Hole 60V Adjustable TO-220-5 Formed Leads TO-220-5 Step-Down 1A
LM2675LDX-ADJ LM2675LDX-ADJ Texas Instruments IC REG BUCK ADJUSTABLE 1A 16WSON In stock9490 pcs 1 Positive Buck 1.21V 37V No 6.5V 260kHz LM2675 Tape & Reel (TR) -40°C ~ 125°C (TJ) SIMPLE SWITCHER® Surface Mount 40V Adjustable 16-WFDFN Exposed Pad 16-WSON (5x5) Step-Down 1A
RT34063AGS RT34063AGS Richtek USA Inc. IC REG BUCK BST ADJ 1.5A 8SOP In stock13860 pcs 1 Positive or Negative Buck, Boost 1.25V 30V (Switch) No 3V 38kHz - Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 30V Adjustable 8-SOIC (0.154", 3.90mm Width) 8-SOP Step-Up, Step-Down 1.5A
TPS62400DRCT TPS62400DRCT Texas Instruments IC REG BUCK ADJ DL 10VSON In stock24956 pcs 2 Positive Buck 0.6V 6V Yes 2.5V 2.25MHz TPS62400 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 6V Adjustable 10-VFDFN Exposed Pad 10-VSON (3x3) Step-Down 400mA, 600mA
MAX1595EUA50+T MAX1595EUA50+T Analog Devices Inc./Maxim Integrated IC REG CHARG PUMP 5V 125MA 8UMAX In stock15335 pcs 1 Positive Charge Pump 5V - No 1.8V 1MHz MAX1595 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Fixed 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 8-uMAX/uSOP Step-Up/Step-Down 125mA
ICL7660SCPA ICL7660SCPA Renesas Electronics America Inc IC REG CHARGE PUMP INV 45MA 8DIP In stock8630 pcs 1 Positive or Negative Charge Pump -Vin, 2Vin - No 1.5V 10kHz ~ 35kHz ICL7660S Tube 0°C ~ 70°C (TA) - Through Hole 12V Fixed 8-DIP (0.300', 7.62mm) 8-PDIP Ratiometric 45mA
AOZ2262AQI-10 AOZ2262AQI-10 Alpha & Omega Semiconductor Inc. IC REG BUCK ADJ 10A 22QFN In stock47630 pcs 1 Positive Buck 0.8V 23.8V Yes 4V 1MHz AOZ2262 Tape & Reel (TR) -40°C ~ 85°C (TA) EZBuck™ Surface Mount 28V Adjustable 22-PowerVFQFN 22-QFN (4x4) Step-Down 10A
MAX1920EUT+T MAX1920EUT+T Analog Devices Inc./Maxim Integrated IC REG BUCK ADJ 400MA SOT23-6 In stock12759 pcs 1 Positive Buck 1.25V 4V Yes 2V 1.2MHz MAX1920 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable SOT-23-6 SOT-6 Step-Down 400mA
LT1373HVIS8#PBF LT1373HVIS8#PBF Analog Devices Inc. IC REG MULT CONFG ADJ 1.5A 8SOIC In stock4587 pcs 1 Positive or Negative Buck, Boost, Cuk, Flyback, Forward Converter, SEPIC 1.245V 42V (Switch) No 2.7V 250kHz LT1373 Tube -40°C ~ 125°C (TJ) - Surface Mount 30V Adjustable 8-SOIC (0.154", 3.90mm Width) 8-SO Step-Up, Step-Down, Step-Up/Step-Down 1.5A (Switch)
LT3991IMSE-5#TRPBF LT3991IMSE-5#TRPBF Analog Devices Inc. IC REG BUCK 5V 1.2A 10MSOP In stock5387 pcs 1 Positive Buck 5V - No 4.3V 200kHz ~ 2MHz LT3991 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 55V Fixed 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad 10-MSOP-EP Step-Down 1.2A
MIC4575WU MIC4575WU Microchip Technology IC REG BUCK BST ADJ 1.7A TO263-5 In stock11569 pcs 1 Positive Buck, Buck-Boost 1.23V 20V No 4V 200kHz MIC4575 Tube -40°C ~ 85°C (TA) - Surface Mount 24V Adjustable TO-263-6, D²Pak (5 Leads + Tab), TO-263BA TO-263-5 Step-Down, Step-Up/Step-Down 1.7A (Switch)
LM2831XMFX LM2831XMFX Texas Instruments IC REG BUCK ADJ 1.5A SOT23-5 In stock7540 pcs 1 Positive Buck 0.6V 4.5V No 3V 1.6MHz LM2831 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 5.5V Adjustable SC-74A, SOT-753 SOT-23-5 Step-Down 1.5A
NN30310AAVB NN30310AAVB Panasonic Electronic Components IC REG BUCK ADJUSTABLE 3A 24QFN In stock7870 pcs 1 Positive Buck 0.75V 5.5V Yes 6V 250kHz, 750kHz, 1.25MHz NN30310 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 30V Adjustable 24-WFQFN Exposed Pad 24-HQFN (4x4) Step-Down 3A
XC6372A551PR-G XC6372A551PR-G Torex Semiconductor Ltd IC REG BOOST 5.5V 400MA SOT89 In stock56540 pcs 1 Positive Boost 5.5V - No 0.9V 100kHz XC6372 Tape & Reel (TR) -30°C ~ 80°C (TA) - Surface Mount 10V Fixed TO-243AA SOT-89 Step-Up 400mA (Switch)
RT7276GQW RT7276GQW Richtek USA Inc. IC REG BUCK ADJUSTABLE 3A 10WDFN In stock38205 pcs 1 Positive Buck 0.765V 8V Yes 4.5V 700kHz RT7276 Tape & Reel (TR) -40°C ~ 85°C (TA) ACOT™ Surface Mount 18V Adjustable 10-WFDFN Exposed Pad 10-WDFN (3x3) Step-Down 3A
MAX1921EUT18 MAX1921EUT18 Analog Devices Inc./Maxim Integrated 400MA, STEP-DOWN DC-DC CONVERTER In stock20968 pcs 1 Positive Buck 1.8V - Yes 2V Up to 1.2MHz - Bulk -40°C ~ 85°C - Surface Mount 5.5V Fixed SOT-23-6 SOT-23-6 Step-Down 400mA
LTC3221EDC#TRPBF LTC3221EDC#TRPBF Analog Devices Inc. IC REG CHARGE PUMP ADJ 60MA 6DFN In stock10600 pcs 1 Positive Charge Pump 1.23V 11V No 1.8V 600kHz LTC3221 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable 6-WFDFN Exposed Pad 6-DFN (2x2) Step-Up 60mA
TPS61288LRQQR TPS61288LRQQR Texas Instruments IC REG BOOST ADJ 11VQFN In stock32170 pcs 1 Positive Boost 4.5V 18V Yes 2V 500kHz - Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 18V Adjustable 11-VFQFN 11-VQFN-HR (2.5x3) Step-Up -
MIC4682BM MIC4682BM Microchip Technology IC REG BUCK ADJUSTABLE 2A 8SOIC In stock13360 pcs 1 Positive Buck 1.23V 32.3V No 4V 200kHz MIC4682 Tube -40°C ~ 125°C (TJ) SuperSwitcher™ Surface Mount 34V Adjustable 8-SOIC (0.154", 3.90mm Width) 8-SOIC Step-Down 2A
TPS62171QDSGRQ1 TPS62171QDSGRQ1 Texas Instruments IC REG BUCK 1.8V 500MA 8WSON In stock69080 pcs 1 Positive Buck 1.8V - Yes 3V 2.25MHz TPS62171 Tape & Reel (TR) -40°C ~ 125°C (TJ) Automotive, AEC-Q100, DCS-Control™ Surface Mount 17V Fixed 8-WFDFN Exposed Pad 8-WSON (2x2) Step-Down 500mA
MAX1697UEUT+T MAX1697UEUT+T Analog Devices Inc./Maxim Integrated IC REG CHARG PUMP INV 60MA SOT23 In stock21145 pcs 1 Positive or Negative Charge Pump -Vin, 2Vin - No 1.6V 120kHz ~ 400kHz MAX1697 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Fixed SOT-23-6 SOT-6 Ratiometric 60mA
TPS61004DGSR TPS61004DGSR Texas Instruments IC REG LINEAR SWITCHING REG In stock23218 pcs - - - - - - - - - Bulk - * - - - - - - -
MAX1920EUT-T MAX1920EUT-T Analog Devices Inc./Maxim Integrated 400MA, STEP-DOWN DC-DC CONVERTER In stock21539 pcs 1 Positive Buck 1.25V 4V Yes 2V Up to 1.2MHz - Bulk -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable SOT-23-6 SOT-23-6 Step-Down 400mA
TPS65130RGERG4 TPS65130RGERG4 Texas Instruments IC REG BUCK BST ADJ DL 24VQFN In stock13490 pcs 2 Positive and Negative (Dual Rail) Boost, Buck-Boost 3.2V, -2V 15V, -15V No 2.7V 1.38MHz TPS65130 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 5.5V Adjustable 24-VFQFN Exposed Pad 24-VQFN (4x4) Step-Up, Step-Up/Step-Down 700mA (Switch)
MAX744ACPA+ MAX744ACPA+ Analog Devices Inc./Maxim Integrated IC REG BUCK 5V 500MA 8DIP In stock13320 pcs 1 Positive Buck 5V - No 6V 185kHz MAX744 Tube 0°C ~ 70°C (TA) - Through Hole 16V Fixed 8-DIP (0.300', 7.62mm) 8-PDIP Step-Down 500mA
LT3689IUD-5#TRPBF LT3689IUD-5#TRPBF Analog Devices Inc. IC REG BUCK 5V 700MA 16QFN In stock7767 pcs 1 Positive Buck 5V - No 3.6V 500kHz ~ 2MHz LT3689 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 36V Fixed 16-WFQFN Exposed Pad 16-QFN (3x3) Step-Down 700mA
LT3001ES5#TRPBF LT3001ES5#TRPBF Analog Devices Inc. 36VIN 4W NO-OPTO ISO FLYBACK CON In stock12100 pcs 1 Positive Flyback 5V - No 4V 10kHz LT3001 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 36V Fixed SOT-23-5 Thin, TSOT-23-5 TSOT-23-5 Step-Up/Step-Down 1.2A
NCP3284MNTXG NCP3284MNTXG onsemi IC GATE DRVR 25A INTEG POL In stock13040 pcs 1 Positive Buck 0.8V 15.3V Yes 4.5V 500kHz, 600kHz, 800kHz, 1MHz NCP3284 Tape & Reel (TR) -40°C ~ 100°C (TA) - Surface Mount 18V Adjustable 37-PowerWFQFN 37-PQFN (5x6) Step-Down 30A
R1286K103M-TR R1286K103M-TR Nisshinbo Micro Devices Inc. PWM STEP-UP/INVERTING DCDC CONVE In stock39355 pcs 2 Positive and Negative Buck, Boost -6V 5.8V Yes 2.3V 1.75MHz R1286 Tape & Reel (TR) -40°C ~ 85°C (TA) R1286K Surface Mount 5.5V Adjustable 12-UFDFN Exposed Pad DFN(PL)2730-12 Step-Up/Inverted 300mA
UCD74111RVFR UCD74111RVFR Texas Instruments IC REG BUCK 15A 40LQFN In stock12022 pcs 1 Positive Buck - - Yes 4.7V Up to 2MHz UCD74111 Tape & Reel (TR) -40°C ~ 125°C (TJ) - Surface Mount 14V - 40-PowerLFQFN 40-LQFN-CLIP (7x5) Step-Down 15A
LT1073CN8#PBF LT1073CN8#PBF Analog Devices Inc. IC REG BUCK BST ADJ 1.5A 8DIP In stock6495 pcs 1 Positive Buck, Boost 1V 50V (Switch) No 1V 19kHz LT1073 Tube 0°C ~ 70°C (TA) - Through Hole 30V Adjustable 8-DIP (0.300', 7.62mm) 8-PDIP Step-Up, Step-Down 1.5A (Switch)
RT8298ZQW RT8298ZQW Richtek USA Inc. IC REG BUCK ADJUSTABLE 6A 14WDFN In stock14780 pcs 1 Positive Buck 0.8V 15V No 4.5V 600kHz RT8298 Tape & Reel (TR) -40°C ~ 85°C (TA) - Surface Mount 24V Adjustable 14-WFDFN Exposed Pad 14-WDFN (4x3) Step-Down 6A
1...164165166167168169170...214
0 RFQ
Shopping cart (0 Items)
It is empty.
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB