800mA 1.5MHz Synchronous Step-Down Converter
Data Sheet


The SP6669 is a synchronous current mode PWM step-down (buck) converter capable of delivering up to 800mA of current. It features a Pulse Skip Mode (PSM) for light load efficiency and an LDO mode for 100% duty cycle.


With a 2.5V to 5.5V input voltage range and a 1.5MHz switching frequency, the SP6669 allows the use of small surface mount inductors and capacitors ideal for battery powered portable applications. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The SP6669 is available in an adjustable output voltage version, using an external resistor divider circuit, as well as fixed output voltage versions of 1.2V, 1.5V and 1.8V.

Built-in over temperature and output overvoltage lock-out protections ensure safe operation under abnormal operating conditions.


The SP6669 is offered in a RoHS compliant, green/halogen free 5-pin SOT-23 package.


  • Guaranteed 800mA Output Current
    • Input Voltage: 2.5V to 5.5V
  • 1.5MHz PWM Current Mode Control
    • 100% Duty Cycle LDO Mode Operations
  • 0.6V 2% Accurate Reference
  • Excellent Line/Load Transient Response
  • 30µA Quiescent Current
  • Over Temperature Protection
  • RoHS Compliant “Green”/Halogen Free 5-Pin SOT23 Package


  • Portable Equipment
  • Battery Operated Equipment
  • Audio-Video Equipment
  • Networking & Telecom Equipment

Design Tools

Symbols & Footprints


Pkg Code Details Quantities Dimensions PDF
SOT-23-5 OPT3
  • JEDEC Reference: MO-178
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 191ºC/W
  • Bulk Pack Style: Canister
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 180 x 8 x 12
  • Tape & Reel Unit Orientation: 3 Pins at sprocket hole
  • Dimensions: mm
  • Length: 2.90
  • Width: 1.60
  • Thickness: 1.45
  • Lead Pitch: 0.95

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
SP6669AEK-L SOT-23-5 OPT3 -40 85 OBS
SP6669AEK-L/TR SOT-23-5 OPT3 -40 85 OBS
SP6669AEK-L/TRR3 SOT-23-5 OPT3 -40 85 Active Order
SP6669BEK-L SOT-23-5 OPT3 -40 85 OBS
SP6669BEK-L/TR SOT-23-5 OPT3 -40 85 OBS
SP6669BEK-L/TRR3 SOT-23-5 OPT3 -40 85 OBS Suggested:
SP6669CEK-L SOT-23-5 OPT3 -40 85 OBS
SP6669CEK-L/TR SOT-23-5 OPT3 -40 85 OBS
SP6669CEK-L/TRR3 SOT-23-5 OPT3 -40 85 OBS Suggested:
SP6669DEK-L SOT-23-5 OPT3 -40 85 OBS
SP6669DEK-L/TR SOT-23-5 OPT3 -40 85 OBS
SP6669DEK-L/TRR3 SOT-23-5 OPT3 -40 85 OBS Suggested:
SP6669DK-L/TR SOT-23-5 OPT3 -40 85 OBS
SP6669EB Board -40 85 Active
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
SP6669AEK-L/TRR3 N Y Y Y L3 / 260ᵒC SOT-23-5

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.
Distribution Date Description File
12/05/2020 ADDENDUM: Changes originally planned for SP6669 have been cancelled at this time.
02/19/2020 Process change. Refer to PCN for details.
02/14/2018 Product Discontinuation Notice
07/26/2016 Product discontinuation notification. Discontinued.
09/29/2015 HHNEC as alternate foundry Addition of an alternate foundry qualification
08/13/2015 Reactivation of previously announced discontinued products due to continuing customer demand. Product Reactivation
07/20/2015 Product discontinuation notification
10/23/2014 Material change and alternate assembly site, Greatek Taiwan, in addition to existing assembly site, Hana China. Qualified Greatek for assembly of the SOT23 package using copper wire bonding. Qualified die attach epoxy Sumitomo CRM-1076DJ-G.
06/06/2011 Addition of the alternate assembly supplier. Capacity enhancement.
08/07/2009 Notice of Obsolescence – Selected Power Management Parts Discontinued due to low market demand, effective immediately.
07/15/2009 These products will be dry packed to eliminate possible moisture related failures at board assembly. There is no change to Form, Fit, or Function as stated in the applicable datasheets. Products having moisture sensitivity greater than level 1 require dry packs according to the internal procedures and JEDEC guidelines.
10/27/2008 Four (4) part numbers were modified to reflect the exact Tape and Reel packaging method. SP6669xEK-L/TR to become SP6669xEK-L/TRR3 with x=A to D. Current part number did not reflect the actual Tape & Reel packing method.


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Frequently Asked Questions

Find the product page of the part that you want to get an evaluation board for and click on Parts & Purchasing. Example:


Find the icons under Buy Now or Order Samples:


Click on the Buy Now icon and see who has stock and click on the Buy button:


Alternatively, you can click on the Order Samples


If the icons are missing, then contact Customer Support.

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:


Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:


And then Product Change Notifications:


Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.

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