Call us: +86 0755-82563503

Currency: $ US Dollar

Items : %s%s

Power Supply Control ICs

Compare Image Name Manufacturer Pricing(USD) Quantity Weight(Kg) Size(LxWxH) Datasheet Factory Lead Time Lifecycle Status Mount Packaging Published Series Pbfree Code Part Status Moisture Sensitivity Level (MSL) Number of Terminations ECCN Code Max Operating Temperature Min Operating Temperature Operating Supply Voltage Length RoHS Status Lead Free Contact Plating Radiation Hardening Number of Pins Additional Feature Package / Case Max Supply Voltage REACH SVHC Reach Compliance Code Min Supply Voltage Frequency Height Width Thickness Mounting Type Weight Operating Temperature Technology Operating Supply Current Max Supply Current Current - Supply Height Seated (Max) HTS Code Number of Functions Nominal Supply Current Max Frequency JESD-609 Code Terminal Finish Terminal Position Terminal Form Peak Reflow Temperature (Cel) Supply Voltage Time@Peak Reflow Temperature-Max (s) Base Part Number Pin Count Temperature Grade Surface Mount Terminal Pitch JESD-30 Code Supply Voltage-Min (Vsup) Number of Channels Subcategory Qualification Status Power Supplies Supply Voltage-Max (Vsup) Max Power Dissipation Output Voltage Output Current-Max Number of Outputs Output Current Voltage - Input Output Power Input Voltage-Nom Analog IC - Other Type Applications Supply Current-Max (Isup) Interface IC Type Watchdog Timer Number of Voltages Monitored Threshold Voltage Output Current Flow Direction Adjustable Threshold Min Reset Threshold Voltage Max Reset Threshold Voltage Undervoltage Threshold Overvoltage Threshold Quiescent Current Accuracy Control Mode Switching Frequency Input Voltage (Min) Input Voltage (Max) Telecom IC Type Reference Voltage Voltage - Supply Control Technique Switcher Configuration Switching Frequency-Max uPs/uCs/Peripheral ICs Type Max Duty Cycle Duty Cycle Number of Monitored Inputs
TEA88182HT/1J TEA88182HT/1J NXP Semiconductors 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 2 Weeks Tape & Reel (TR) Active 3 (168 Hours) ROHS3 Compliant
SI8250-IM SI8250-IM Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tube 1997 yes Obsolete 1 (Unlimited) 28 5mm Non-RoHS Compliant Contains Lead 28 28-VFQFN Exposed Pad 5mm Surface Mount 67.75536mg -40°C~125°C CMOS 26mA QUAD 2.5V SI825 28 0.5mm Digital Power Controller No 2.25V~2.75V MICROPROCESSOR CIRCUIT 1
LTC4151IMS#PBF LTC4151IMS#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 3 weeks ago) Tube 2012 Active 1 (Unlimited) 10 EAR99 3mm ROHS3 Compliant No 10 10-TFSOP, 10-MSOP (0.118, 3.00mm Width) 3mm Surface Mount -40°C~85°C CMOS 1.2mA 1 e3 Matte Tin (Sn) DUAL GULL WING 260 48V 30 LTC4151 10 YES 0.5mm 7V 1 Power Management Circuits 7/80V 80V 7V~80V POWER SUPPLY SUPPORT CIRCUIT Power Supply Monitor NO 1 % 7V~80V
LTC2954IDDB-1#TRPBF LTC2954IDDB-1#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 10 Weeks Tape & Reel (TR) 2011 Active 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant 8-WFDFN Exposed Pad 2mm Surface Mount -40°C~85°C CMOS 6μA 0.8mm 8542.39.00.01 1 e3 Matte Tin (Sn) DUAL NO LEAD 260 30 LTC2954 8 YES 0.5mm R-PDSO-N8 2.7V 1 Power Management Circuits Not Qualified 3/24V 26.4V POWER SUPPLY SUPPORT CIRCUIT Push Button, On/Off Controller 0.012mA YES 2.7V~26.4V
SI8251-IM SI8251-IM Silicon Labs 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Tube 2006 yes Obsolete 1 (Unlimited) 28 5mm Non-RoHS Compliant Contains Lead 28 28-VFQFN Exposed Pad 5mm Surface Mount 67.75536mg -40°C~125°C CMOS 26mA 1mm 8542.31.00.01 QUAD 2.5V SI825 28 YES 0.5mm Digital Power Controller No 2.25V~2.75V MICROPROCESSOR CIRCUIT
MAX16053AUT/GG8 MAX16053AUT/GG8 Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Bulk Active 1 (Unlimited)
MAX17606AZT+T MAX17606AZT+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 6 Weeks Surface Mount Tape & Reel (TR) 2016 yes Active 1 (Unlimited) ROHS3 Compliant SOT-23-6 Thin, TSOT-23-6 Surface Mount -40°C~125°C 320μA NOT SPECIFIED NOT SPECIFIED MAX17606 Secondary-Side Controller HALF BRIDGE BASED MOSFET DRIVER 4.5V~36V
UCC2839DG4 UCC2839DG4 Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tube no Obsolete 2 (1 Year) 14 EAR99 8.65mm ROHS3 Compliant Contains Lead 14 14-SOIC (0.154, 3.90mm Width) 1MHz 3.9mm Surface Mount 122.413241mg -40°C~85°C BICMOS 1.3mA 1 DUAL GULL WING NOT SPECIFIED NOT SPECIFIED UCC2839 14 YES Switching Regulator or Controllers Not Qualified 7.5V 1 10mA 7.5V SWITCHING CONTROLLER Secondary-Side Controller CURRENT-MODE 1MHz 20V 7.5V~15V PULSE WIDTH MODULATION SINGLE 100 %
LM5115AMT LM5115AMT Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tube no Obsolete 1 (Unlimited) 16 EAR99 75V 5mm Non-RoHS Compliant Contains Lead No 16 CURRENT MODE TECHNIQUE IS ALSO POSSIBLE 16-TSSOP (0.173, 4.40mm Width) 4.4mm Surface Mount -40°C~125°C 4mA 1 1MHz e0 Tin/Lead (Sn/Pb) DUAL GULL WING 260 LM5115 16 0.65mm Switching Regulator or Controllers 13.5V 1 20A 5V~30V 300W 12V SWITCHING CONTROLLER Secondary-Side Controller VOLTAGE-MODE 1MHz 5V~7.5V PULSE WIDTH MODULATION PUSH-PULL 85 % 85 %
LTC3766HGN LTC3766HGN Linear Technology/Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 Tube Direct Flux Limit™, PolyPhase® Obsolete 1 (Unlimited) 28 EAR99 9.893mm Non-RoHS Compliant 8.5V OUTPUT VOLTAGE AVAILABLE, ALSO HAS CONTROL MODE OF IPK 28-SSOP (0.154, 3.90mm Width) 3.899mm Surface Mount -40°C~150°C CMOS 5mA 1.75mm 8542.39.00.01 1 e3 Matte Tin (Sn) DUAL GULL WING NOT SPECIFIED NOT SPECIFIED 28 YES 0.635mm R-PDSO-G28 Switching Regulator or Controllers Not Qualified 7V 5V~32V 15V SWITCHING CONTROLLER Synchronous Forward Controller VOLTAGE-MODE 5V~10V PULSE WIDTH MODULATION PUSH-PULL 316kHz
MAX34451ETN+ MAX34451ETN+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Tray 2013 yes Obsolete 1 (Unlimited) 56 EAR99 ROHS3 Compliant 56 56-WFQFN Exposed Pad Unknown Surface Mount -40°C~85°C 18mA 8542.39.00.01 QUAD 3.3V MAX34451 YES 0.4mm Power Management Circuits 3.3V POWER SUPPLY MANAGEMENT CIRCUIT Base Station-Networking Line Cards, Servers No 2.048V 3V~3.6V 12
ADM1168ASTZ ADM1168ASTZ Analog Devices Inc. 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 2 weeks ago) Surface Mount Tray Super Sequencer® no Active 3 (168 Hours) 32 EAR99 7mm ROHS3 Compliant Contains Lead Tin 32 32-LQFP No SVHC 1.4mm 7mm Surface Mount -40°C~85°C 4.2mA 1 4.2mA e3 QUAD GULL WING 260 4.75V 30 ADM1168 32 2.7V 1 Power Management Circuits Not Qualified 3/14.43.3/5V 5.4V 3V~14.4V POWER SUPPLY MANAGEMENT CIRCUIT Power Supply Monitor, Sequencer Yes 14.4V NO 573mV 1.375V 6V 8.4V 2.048V 3V~14.4V 8
LT3804EFE#PBF LT3804EFE#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Tube 2003 Active 1 (Unlimited) 28 EAR99 9.7mm ROHS3 Compliant 28-TSSOP (0.173, 4.40mm Width) Exposed Pad 4.4mm Surface Mount -40°C~125°C 9mA 1.2mm 8542.39.00.01 1 e3 Matte Tin (Sn) DUAL GULL WING 260 30 LT3804 28 YES 0.65mm R-PDSO-G28 Not Qualified 1A 11V SWITCHING CONTROLLER Secondary-Side Controller VOLTAGE-MODE 8V 25V 8V~25V PULSE WIDTH MODULATION PUSH-PULL 570kHz
LM2640MTC-ADJ/NOPB LM2640MTC-ADJ/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 2 days ago) Surface Mount Tube yes Active 3 (168 Hours) 28 EAR99 30V 9.7mm ROHS3 Compliant Lead Free No 28 28-TSSOP (0.173, 4.40mm Width) 1.2mm 4.4mm 1mm Surface Mount 0°C~125°C 1 GULL WING 260 LM2640 28 0.65mm 3 6V 2 20A 5.5V~30V 10V DUAL SWITCHING CONTROLLER Dual Power Supply Controller 600μA CURRENT-MODE 200kHz 5.5V~30V PULSE WIDTH MODULATION PUSH-PULL
LTC3766HGN#TRPBF LTC3766HGN#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 12 Weeks PRODUCTION (Last Updated: 3 weeks ago) Tape & Reel (TR) 2011 Direct Flux Limit™, PolyPhase® Active 1 (Unlimited) 28 EAR99 9.893mm ROHS3 Compliant 28 8.5V OUTPUT VOLTAGE AVAILABLE, ALSO HAS CONTROL MODE OF IPK 28-SSOP (0.154, 3.90mm Width) 3.899mm Surface Mount -40°C~150°C CMOS 5mA 1 e3 Matte Tin (Sn) DUAL GULL WING NOT SPECIFIED NOT SPECIFIED LTC3766 28 YES 0.635mm 1 Switching Regulator or Controllers Not Qualified 7V 5V~32V 15V SWITCHING CONTROLLER Synchronous Forward Controller VOLTAGE-MODE 5V~10V PULSE WIDTH MODULATION PUSH-PULL
ISL68124IRAZ-T7A ISL68124IRAZ-T7A Renesas Electronics America 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 4 Weeks Tape & Reel (TR) Active 3 (168 Hours) 40 EAR99 5mm ROHS3 Compliant 40-WFQFN Exposed Pad 1MHz 5mm Surface Mount -40°C~85°C TA 0.8mm 8542.39.00.01 1 e3 MATTE TIN QUAD NO LEAD NOT SPECIFIED NOT SPECIFIED 40 YES 0.4mm S-PQCC-N40 3.05V 3.3V DUAL SWITCHING CONTROLLER 3.135V 3.465V PULSE WIDTH MODULATION
LTC2920-1CS5#TRM LTC2920-1CS5#TRM Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Cut Tape (CT) 2008 Discontinued 1 (Unlimited) 5 EAR99 2.9mm Non-RoHS Compliant SOT-23-5 Thin, TSOT-23-5 not_compliant 1.625mm Surface Mount 0°C~70°C 230μA 1mm 8542.39.00.01 1 e0 Tin/Lead (Sn/Pb) GULL WING 235 20 LTC2920-1 5 YES 0.95mm R-PDSO-G5 2.3V Not Qualified 6V ANALOG CIRCUIT Single/Dual Power Supply Controller 2.3V~6V
MAX16066ETL+ MAX16066ETL+ Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 17 Weeks Surface Mount Tube 2011 yes Obsolete 1 (Unlimited) 40 EAR99 6mm ROHS3 Compliant No 48 40-WFQFN Exposed Pad 6mm Surface Mount -40°C~85°C BICMOS 4.5mA 1 4.5mA e3 Matte Tin (Sn) QUAD 260 3.3V MAX16066 40 0.5mm S-XQCC-N40 8 Power Management Circuits 14V 2.105W POWER SUPPLY MANAGEMENT CIRCUIT Power Supply Monitor, Sequencer 14mA 8 YES 2.7V 2.8V~14V
LTC2954CDDB-1#TRMPBF LTC2954CDDB-1#TRMPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks PRODUCTION (Last Updated: 1 week ago) Tape & Reel (TR) 2011 Active 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant Lead Free No 8 8-WFDFN Exposed Pad 2mm Surface Mount 0°C~70°C CMOS 6μA 1 e3 Matte Tin (Sn) DUAL 260 30 LTC2954 8 YES 0.5mm 2.7V 1 Power Management Circuits 3/24V 26.4V POWER SUPPLY SUPPORT CIRCUIT Push Button, On/Off Controller 0.012mA YES 2.7V~26.4V
LTC2977CUP#PBF LTC2977CUP#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks PRODUCTION (Last Updated: 2 weeks ago) Tube 2013 Active 1 (Unlimited) 64 EAR99 9mm ROHS3 Compliant Lead Free 64 ALSO OPERATES IN 3.3V 64-WFQFN Exposed Pad No SVHC Surface Mount 0°C~70°C CMOS 10mA 0.8mm 8542.39.00.01 1 e3 Matte Tin (Sn) QUAD NO LEAD NOT SPECIFIED 12V NOT SPECIFIED LTC2977 64 YES 0.5mm 4.5V 8 15V POWER SUPPLY MANAGEMENT CIRCUIT Power Supply Controller/Monitor YES 3.3V 4.5V~15V
SIP11204DLP-T1-E3 SIP11204DLP-T1-E3 Vishay Siliconix 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 2013 Obsolete 1 (Unlimited) 16 EAR99 ROHS3 Compliant 16 PowerPAK® MLP44-16 Surface Mount -40°C~85°C 15.5mA QUAD NO LEAD SIP11204 16 Not Qualified 1 Secondary-Side Controller, Synchronous Rectifier HALF BRIDGE BASED PERIPHERAL DRIVER SOURCE SINK 5.5V~13V
ISL6121LIB ISL6121LIB Intersil (Renesas Electronics America) 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount 2001 Discontinued 1 8 EAR99 85°C -40°C 4.9mm Non-RoHS Compliant Contains Lead SOIC not_compliant 3.9mm 1.75mm 8542.39.00.01 1 e0 Tin/Lead (Sn/Pb) DUAL GULL WING 240 5V 30 8 INDUSTRIAL 1.27mm R-PDSO-G8 2.5V 1 Power Management Circuits Not Qualified 3/5V 5.5V POWER SUPPLY SUPPORT CIRCUIT 0.2mA NO
MAX16066ETL+T MAX16066ETL+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 14 Weeks Surface Mount Tape & Reel (TR) 2015 yes Obsolete 3 (168 Hours) 40 EAR99 6mm ROHS3 Compliant 40 40-WFQFN Exposed Pad 6mm Surface Mount -40°C~85°C BICMOS 4.5mA 1 QUAD NO LEAD NOT SPECIFIED 3.3V NOT SPECIFIED MAX16066 40 0.5mm 8 Power Management Circuits Not Qualified 14V 2.105W POWER SUPPLY MANAGEMENT CIRCUIT Power Supply Monitor, Sequencer 14mA 8 YES 2.7V 2.8V~14V
LTC1698ES#TRPBF LTC1698ES#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Tape & Reel (TR) 2003 Active 1 (Unlimited) 16 EAR99 9.9mm ROHS3 Compliant 16-SOIC (0.154, 3.90mm Width) 3.9mm Surface Mount -40°C~85°C 1.8mA 1.75mm 8542.39.00.01 1 e3 Matte Tin (Sn) DUAL GULL WING 260 30 LTC1698 16 YES 1.27mm R-PDSO-G16 Not Qualified 8V SWITCHING CONTROLLER Secondary-Side Controller, Synchronous Rectifier CURRENT-MODE 6V 12.6V 6V~12.6V PULSE WIDTH MODULATION SINGLE
LTC2922CF#TRPBF LTC2922CF#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 16 Weeks Tape & Reel (TR) 2004 Active 1 (Unlimited) 20 EAR99 6.5mm ROHS3 Compliant 20-TSSOP (0.173, 4.40mm Width) 4.4mm Surface Mount 0°C~70°C 2mA 1.1mm 8542.39.00.01 1 e3 Tin (Sn) DUAL GULL WING 250 5V 40 LTC2922 20 YES 0.65mm R-PDSO-G20 4.5V 4 Not Qualified 5.5V POWER SUPPLY SUPPORT CIRCUIT Five Power Supply Monitor YES 4.5V~5.5V
LTC2950CDDB-2#TRMPBF LTC2950CDDB-2#TRMPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 2005 Active 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant 8-WFDFN Exposed Pad 2mm Surface Mount 0°C~70°C CMOS 6μA 0.8mm 8542.39.00.01 1 e3 Matte Tin (Sn) DUAL NO LEAD 260 3.3V 30 LTC2950 8 YES 0.5mm R-PDSO-N8 2.7V 1 Power Management Circuits Not Qualified 3/24V 26.4V POWER SUPPLY SUPPORT CIRCUIT Push Button, On/Off Controller 0.012mA NO 2.7V~26.4V
LTC2951CTS8-1#TRPBF LTC2951CTS8-1#TRPBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 8 Weeks Tape & Reel (TR) 2010 Active 1 (Unlimited) 8 EAR99 2.9mm ROHS3 Compliant SOT-23-8 Thin, TSOT-23-8 1.625mm Surface Mount 0°C~70°C CMOS 6μA 1mm 8542.39.00.01 1 e3 Matte Tin (Sn) DUAL GULL WING 260 30 LTC2951 8 YES 0.65mm R-PDSO-G8 2.7V 1 Power Management Circuits Not Qualified 3/24V 26.4V POWER SUPPLY SUPPORT CIRCUIT Push Button, On/Off Controller 0.012mA YES 2.7V~26.4V
MAX4972EBC+T MAX4972EBC+T Maxim Integrated 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download Surface Mount Tape & Reel (TR) 2008 Obsolete 1 (Unlimited) ROHS3 Compliant 12 12-WFBGA, WLCSP 28V 2.2V Surface Mount -40°C~85°C 60μA 107μA 8542.39.00.01 MAX4972 519mW 2.2V~28V Overvoltage Protection Controller No 4.35V 5.05V SURGE PROTECTION CIRCUIT
LM3881MM/NOPB LM3881MM/NOPB Texas Instruments 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 6 Weeks ACTIVE (Last Updated: 3 days ago) Surface Mount Tape & Reel (TR) yes Active 1 (Unlimited) 8 EAR99 3mm ROHS3 Compliant Lead Free Tin 8 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) No SVHC 1.07mm 3mm 970μm Surface Mount -40°C~125°C 80μA 1 80μA e3 DUAL GULL WING 260 3.3V LM3881 8 0.65mm 2.7V 1 Power Management Circuits 5.5V 400mV 3 ANALOG CIRCUIT Power Supply Sequencer 0.11mA No 1.22V 300mV 1.4V 500mV 1.22V 80μA 2.7V~5.5V
LTC2978IUP#PBF LTC2978IUP#PBF Linear Technology / Analog Devices 0.0000
RFQ

Min: 1

Mult: 1

0.00000000 download 10 Weeks Tube 2012 yes Obsolete 1 (Unlimited) 64 EAR99 9mm RoHS Compliant 64-WFQFN Exposed Pad compliant 9mm Surface Mount -40°C~85°C CMOS 10mA 0.8mm 8542.39.00.01 1 e3 Matte Tin (Sn) QUAD NO LEAD 260 12V 30 LTC2978 64 YES 0.5mm S-PQCC-N64 4.5V 8 Power Management Circuits Not Qualified 3.312V 15V POWER SUPPLY MANAGEMENT CIRCUIT Power Supply Controller/Monitor 13mA YES 3.3V 4.5V~15V
Settings Need Help?
Top FAQ's

How can I quickly find answers to my questions?

Please visit the Help & Support area of our website to find information regarding ordering, shipping, delivery and more.

What is my Order Status?

Registered users can track orders from their account dropdown, or click here. *Order Status may take 12 hours to update after initial order is placed.

How do I return product?

Users can begin the returns process by starting with our Returns Page.

How do I find price and availability?

Quotes can be created by registered users in myLists.

How do I create a 'HK JDW' Account?

Visit the Registration Page and enter the required information. You will receive an email confirmation when your registration is complete.

United Kingdom/GBP Summary
Fast Shipping Fast Delivery

Orders are typically delivered to United Kingdom within 48 hours depending on location.

Free Shipping Free Shipping

Free delivery to United Kingdom on orders of £33 or more. A delivery charge of £12 will be billed on all orders less than £33.

Incoterms Incoterms

DDP (Duty and customs paid by HK JDW)

Payment Options Payment Types

Credit account for qualified institutions and businesses

Payment in Advance by Wire Transfer

Visa Mastercard American Express PayPal Apple Pay Google Pay

Marketplace Marketplace Product

More Products From Fully Authorized Partners

Average Time to Ship 1-3 Days, extra ship charges may apply. Please see product page, cart, and checkout for actual ship speed.

Incoterms: CPT (Duty, customs, and applicable VAT/Tax due at time of delivery)

For more information visit Help & Support