3A, 300kHz Buck Regulator


Information 3A 300kHz Buck Regulator
Package DFN-26
IQ (µA) 1500
Special Features Enable, Power Sequencing, Synchronous Rectification, Thermal Shutdown, UVLO Adjustable, Soft Start Adjustable
VIN MIN (V) 2.5
VIN MAX (V) 28
# of Outputs 1
VOUT MIN (V) 0.8
Frequency (kHz) 300
Efficiency (%) 95
Accuracy (%) 1.0
IOUT (A) 3
X x Y Package Dimension (mm) 7x4
Control Mode Voltage Mode PWM
Operating Temperature (°C) -40 to 125
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The SP7650 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed to be especially attractive for dual supply, 12V or 24V distributed power systems stepped-down with 5V used to power the controller. This lower VCC voltage minimizes power dissipation in the part and is used to drive the top switch. The SP7650 is designed to provide a fully integrated buck regulator solution using a fixed 300kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short circuit protection. The SP7650 is available in the space saving DFN package.

  • 2.5V to 28V step-down achieved using dual input
  • Output voltage down to 0.8V
  • 3A output capability
  • Built in low RDSON power switches (40 mΩ typ)
  • Highly integrated design, minimal components
  • 300 kHz fixed frequency operation
  • UVLO detects both VCC and VIN
  • Over temperature protection
  • Short circuit protection with auto restart
  • Wide BW Amp allows type II or III compensation
  • Programmable soft-start
  • Fast transient response
  • High efficiency: greater than 95% possible
  • Nonsynchronous start up into a pre-charged output
  • Small 7mm x 4mm DFN package

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets SP7650 Wide Input Voltage Range 3A, 300kHz, Buck Regulator 1.0.0 June 2007 1.8 MB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Application Notes ANP-25, PowerBlox™ Thermal Analysis A January 2007 2.5 MB
Application Notes ANP-06, PowerBloxTM in Distributed Power Architectures A November 2006 328.9 KB
Application Notes ANP-04, CAD Layout Recommendations for the PowerBlox™ Family A November 2006 115.9 KB
Application Notes ANP-15, Voltage Mode Control: The Modulator in Continuous Current Mode (CCM) of operation D November 2006 430 KB
Application Notes ANP-05, Thermal Resistance on SP765x Devices A June 2005 387.7 KB
User Guides & Manuals SP7650 Evaluation Board Manual 1.0.0 February 2007 355.4 KB
Design Solutions DS-44, Converting Up to 16V Input to 2.5V Output With PowerBlox To Achieve With Over 88% Peak Efficiency November 2007 106 KB
Design Solutions DS-50, 600kHz Point-Of-Load Converter Provides 10A at 1.2V from 3.3V Supply With Power Good, UVLO and Enable, With 87% Efficiency at Maximum Output Current November 2007 329.4 KB
Spice Models - Generic Generic Spice Model November 2007 4.2 KB
Spice Models - OrCAD Orcad Spice Model November 2007 19.1 KB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints SP7650ER-L/TR CAD File (.bxl) September 2018 46 KB
SIMPLIS Models SP7650 SIMPLIS Model May 2011 12.9 MB
SIMPLIS Models Powerlab Netlists
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SP7650ER-L/TR N Y Y Y Y L3 / 260ᵒC DFN26 7x4

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

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement Buy Now Order Samples PDN
SP7650BER-L DFN26 7x4 -40 85 EOL
SP7650ER DFN26 7x4 -40 85 OBS
SP7650ER/TR DFN26 7x4 -40 85 OBS
SP7650ER-L DFN26 7x4 -40 85 OBS SP7650ER-L/TR
SP7650ER-L/TR DFN26 7x4 -40 85 Active Order
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.


Pkg Code Details Quantities Dimensions PDF
DFN26 7x4
  • JEDEC Reference: n/a
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 36ºC/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): 330 x 16 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 7
  • Width: 4
  • Thickness: 1.00
  • Lead Pitch: 0.5


Distribution Date Description File
02/07/2022 MaxLinear has qualified an alternate FET fab location to ensure continuity of supply.
05/01/2017 Embedded FETs updated to latest production version.
01/05/2017 Addition of an alternate qualified location, ANST, China.
07/26/2016 Product discontinuation notification. Discontinued.
10/16/2013 Qualified PPF (NiPdAu) lead termination finish in assembly to replace matte-tin plating. Material change.
10/04/2013 Addition of an alternate qualified assembly site, UTAC Thailand, for assembly using copper or gold wire bonding. Material change and alternate assembly site.
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.

FAQs & Support

Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.

Submit a Technical Support Question As a New Question

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.