Low Voltage Step-Down PWM Controller
Data Sheets EOL (End of Life)


Information Low Voltage Step Down PWM Controller
Max Rec. Output Current (A) 10
IQ (µA) 500
VIN MAX (V) 5.5
VOUT MIN (V) 0.8
VOUT MAX (V) 4.5
Frequency (kHz) 300
Efficiency (%) 95
Control Mode Voltage Mode PWM
Special Features Enable, Synchronous Rectification, Thermal Shutdown, UVLO, Soft Start Built-in, Adustable Current Limit
Operating Temp Range (°C) -40 to 85, -40 to 105
Package TSSOP-14
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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

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets SP6128A Low Voltage, Synchronous Step Down PWM Controller 1.0.0 July 2006 125.9 KB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Application Notes ANP-16, Loop Compensation of Voltage-Mode Buck Converters A January 2008 105.3 KB
Application Notes ANP-18, Selecting Appropriate Compensation: Type-II or Type-III A December 2006 41.3 KB
Application Notes ANP-18, Type II Loop Compensation Calculator A December 2006 589 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-20, Properly Sizing MOSFETs for PWM Controllers A November 2006 526.5 KB
Application Notes ANP-16, Type III Loop Compensation Calculator A October 2006 595 KB
User Guides & Manuals SP6128A Evaluation Board Manual 1.0.0 September 2005 471.3 KB
Spice Models - Generic Generic Spice Model November 2007 3.6 KB
Spice Models - OrCAD Orcad Spice Model November 2007 95.6 KB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints SP6128AEY-L/TR CAD File (.bxl) September 2018 96.4 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SP6128AEY-L/TR N Y 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.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement Buy Now PDN
SP6128ACY TSSOP14 0 70 OBS
SP6128ACY-L TSSOP14 0 70 OBS SP6128AEY-L
SP6128AEY TSSOP14 -40 85 OBS
SP6128AEY-L TSSOP14 -40 85 OBS SP6128AEY-L/TR
SP6128AEY/TR TSSOP14 -40 85 OBS
SP6128AHY TSSOP14 -40 105 OBS
SP6128AHY-L TSSOP14 -40 105 OBS SP6128AHY-L/TR
SP6128AHY-L/TR TSSOP14 -40 105 OBS SP6128AEY-L/TR
SP6128AHY/TR TSSOP14 -40 105 OBS
SP6128ASEY-L TSSOP14 -40 85 OBS SP6128AEY-L
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.


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


Distribution Date Description File
10/10/2023 Product Discontinuation Notice
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

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