Low Voltage Step-Down PWM Controller
Data Sheet


The SP6128A is a fixed frequency, voltage mode, synchronous PWM controller designed to work from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high efficiency power conversion. Requiring only few external components, the SP6128A packaged in a 14-pin TSSOP, is especially suited for low voltage applications where cost, small size and high efficiency are critical. The operating frequency is internally set to 300kHz, allowing small inductor values and minimizing PC board space. The SP6128A drives two N-channel power MOSFETs for improved efficiency and includes an accurate 0.8V reference for low output voltage applications.


  • Optimized for single supply, 3V to 5.5V applications
  • High efficiency: greater than 95% possible
  • Discontinuous startup for pre-charged output
  • Accurate fixed 300kHz frequency operation
  • Fast transient response
  • Internal soft-start circuit
  • Accurate 0.8V reference allows low output voltages
  • Resistor programmable output voltage
  • Resistor programmable overcurrent Threshold
  • Loss-less current limit with high side RDS(ON) sensing
  • Hiccup mode current limit protection
  • Dual N-channel MOSFET synchronous driver
  • Quiescent current: 500μA, 30μA in shutdown
  • 14 pin TSSOP


Design Tools

Simulation Models
Symbols & Footprints


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-153
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 100.4ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 2500
  • Quantity per Tube: 94
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 5.00
  • Width: 4.40
  • Thickness: 1.2
  • Lead Pitch: 0.65

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
SP6128ACY TSSOP14 0 70 OBS
SP6128ACY-L TSSOP14 0 70 OBS Suggested:
SP6128ACY-L/TR TSSOP14 0 70 OBS Suggested:
SP6128AEY TSSOP14 -40 85 OBS
SP6128AEY/TR TSSOP14 -40 85 OBS
SP6128AEY-L TSSOP14 -40 85 OBS Suggested:
SP6128AEY-L/TR TSSOP14 -40 85 Active Order
SP6128AHY TSSOP14 -40 105 OBS
SP6128AHY/TR TSSOP14 -40 105 OBS
SP6128AHY-L TSSOP14 -40 105 OBS Suggested:
SP6128AHY-L/TR TSSOP14 -40 105 OBS Suggested:
SP6128ASEY-L TSSOP14 -40 85 OBS Suggested:
SP6128ASEY-L/TR TSSOP14 -40 85 OBS Suggested:
SP6128CY TSSOP14 0 70 OBS
SP6128CY/TR TSSOP14 0 70 OBS
SP6128EY TSSOP14 0 70 OBS
SP6128EY/TR TSSOP14 0 70 OBS
SP6128EB Board 0 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.

Quality & Environmental Data

Part Number RoHS | Exempt RoHS Halogen Free REACH MSL Rating / Peak Reflow Package
SP6128AEY-L/TR N Y Y Y L1 / 260ᵒC TSSOP14

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
07/11/2017 Product Discontinuation Notification
05/10/2017 Qualification of alternate assembly subcon, JCET.
03/17/2017 Qualification of copper wire bonding assembly in Carsem.
02/15/2017 Qualification of alternate assembly subcon, ANST.
07/26/2016 Product discontinuation notification. Discontinued.
07/20/2015 Product discontinuation notification
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.
06/26/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site
02/15/2006 1. Adjusted the level shifter for correct low voltage operation. 2. Reduce bandgap compensation capacitor for better dV/dT performance. Note: There is no change in the data sheet or part functionality. Customer Request
02/02/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site


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.

Frequently Asked Questions

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.

See Application Note ANP-20 (Properly Sizing MOSFETs for PWM Controllers).

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