1A Synchronous Step-Down Regulator
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Information 1A Synchronous Step-Down Regulator
# of Outputs 1
IOUT (A) 1
VIN MIN (V) 2.5
VIN MAX (V) 5.5
IQ (µA) 30
VOUT MIN (V) 0.6
Frequency (kHz) 1500
Accuracy (%) <3.0
Efficiency (%) 97
Package SOT23-5
X x Y Package Dimension (mm) -
Control Mode Current Mode PWM
Special Features Light Load PFM, Enable, Over Current Protection, Synchronous Rectification, Thermal Shutdown, UVLO, 100% Duty Cycle
Operating Temperature (°C) -40 to 125
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The XRP6658 is a synchronous current mode PWM step-down (buck) converter capable of delivering up to 1Amp of current and optimized for portable battery operated operations.

Based on a current mode 1.5MHz constant frequency PWM control scheme, the XRP6658 reduces the overall component count and solution footprint as well as providing a low output voltage ripple and excellent line and load regulation. It also implements a PFM mode to improve light load efficiency as well as a 100% duty cycle LDO mode. Output voltage is adjustable as low as 0.6V with a better than 3% accuracy while a low quiescent current supports the most stringent battery operations conditions. Built-in over temperature and undervoltage lock-out protections insure safe operations under abnormal operating conditions.

The XRP6658 is offered in a RoHS compliant, “green”/halogen free 5-pin SOT23 package.


  • Guaranteed 1A output current
    • Input voltage: 2.5V to 5.5V
  • 1.5MHz PWM current mode control
    • PFM mode operations at light load
    • 100% duty cycle LDO mode operations
  • As low as 0.6V adjustable output voltage
  • Internal compensation network
  • 30µA quiescent current
  • Over temperature and UVLO protections
  • RoHS compliant “green”/halogen free 5-pin SOT23 package

  • Portable equipment
  • Battery operated equipment
  • Audio video equipment
  • Networking and telecom equipment

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets XRP6658 1A 1.5MHz PFM/PWM Synchronous Step-Down Converter 2.0.0 February 2020 1.4 MB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
User Guides & Manuals XRP6658 Evaluation Board Manual 2.1.0 February 2012 365.4 KB
Product Flyers Power Management & Interface Products for Cable, Satellite and IP STB/Home Gateway March 2018 2 MB
Product Flyers 1A 1.5MHz Synchronous Step-Down Converter September 2010 855.6 KB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints XRP6658ISTR-F CAD File (.bxl) September 2018 82.2 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
XRP6658ISTR-F N Y 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.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Buy Now Order Samples
XRP6658ISTR-F SOT-23-5 -40 85 Active Order
XRP6658EVB Board Active

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-178
  • MSL Pb-Free: L1 @ 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


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.
11/10/2014 Alternate Foundry Site & Process Change. Qualified HHNEC 0.45um 5V process in addition to the existing Foundry Magnachip 0.5um 5V process.
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.
01/11/2012 Hana-JX/China is utilized as an alternate qualified assembly supplier for XRP6658 family in addition to the GTK. Capacity enhancement.

FAQs & Support

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The -F suffix indicates ROHS / Green compliance: