3A, 900kHz Buck Regulator
Data Sheets OBS (Obsolete)


Information 3A 900kHz Buck Regulator
# of Outputs 1
IOUT (A) 3
VIN MIN (V) 2.5
VIN MAX (V) 20
IQ (µA) 1500
VOUT MIN (V) 0.8
Frequency (kHz) 900
Accuracy (%) 1.0
Efficiency (%) 92
Package DFN-26
X x Y Package Dimension (mm) 7x4
Control Mode Voltage Mode PWM
Special Features Enable, Power Sequencing, Synchronous Rectification, Thermal Shutdown, UVLO Adjustable, Soft Start Adjustable
Operating Temperature (°C) -40 to 125
Show more

The SP7651 is a high voltage synchronous step-down switching regulator optimized for high efficiency. The part is designed to be especially attractive for dual supply, 12V step-down with 5V used to power the controller. This lower VCC voltage minimizes power dissipation in the part. The SP7651 is designed to provide a fully integrated buck regulator solution using a fixed 900kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output short-circuit protection. The SP7651 is available in the space saving 7mm X 4mm DFN package.

  • 2.5V to 20V step-down achieved using dual input
  • Output voltage down to 0.8V
  • 3A output capability (up to 5A with air flow)
  • Built in low RDSON power FETs (40 mΩ typ)
  • Highly integrated design, minimal components
  • 900 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 92% 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 SP7651 Wide Input Voltage Range 3Amp 900kHz Buck Regulator 1.0.0 March 2007 1 MB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Design Solutions DS-65, SP7651 First Generation PowerBlox Creates 2A Peak Current off Adapter 12V Secondary (10V to 15V Input) June 2007 113.4 KB
Spice Models - Generic Generic Spice Model November 2007 4.2 KB
Spice Models - OrCAD Orcad Spice Model November 2007 20.3 KB
Product Brochures Power Management Brochure October 2020 2.4 MB
SIMPLIS Models SP7651 SIMPLIS Model May 2011 12.9 MB
Symbols & Footprints SP7651ER-L/TR CAD File (.bxl) September 2018 46 KB
SIMPLIS Models Powerlab Netlists
Register for a myMxL account or Login to myMxL to view all Technical Documentation & Design Tools.

Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SP7651ER-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 PDN
SP7651BER-L DFN26 7x4 -40 85 OBS
SP7651ER DFN26 7x4 -40 85 OBS
SP7651ER-L DFN26 7x4 -40 85 OBS SP7651ER-L/TR
SP7651ER-L/TR DFN26 7x4 -40 85 OBS SP7652ER-L/TR
SP7651ER/TR DFN26 7x4 -40 85 OBS
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
01/12/2021 Product Discontinuation Notice
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

Visit the product page for the part you are interested in.  The part's status is listed in the Parts & Purchasing section.  You can also view Product Lifecycle and Obsolescence Information including PDNs (Product Discontinuation Notifications).
To visit a product page, type the part into the search window on the top of the MaxLinear website.
In this example, we searched for XRA1201.  Visit the product page by clicking the part number or visit the orderable parts list by clicking "Orderable Parts". 



The Parts & Purchasing section of the product page shows the Status of all orderable part numbers for that product.  Click Show obsolete parts, to see all EOL or OBS products.