Semtech Extends Buck Regulator Platform with Ultra Compact 1A, 1.5A and 2A Devices

1.5A SC189 is Industry's Smallest, Measuring 2mm x 2mm x 0.6mm; All Three Regulators Offer High Efficiency

Camarillo, California - August 25, 2009

Semtech Corp. (Nasdaq: SMTC), a leading supplier of analog and mixed-signal semiconductors, today announced three new small form-factor buck (step down) DC-DC regulators that provide a compact, high-efficiency solution to demanding point of load applications in a wide range of printer, networking, medical and other systems. The SC4626, SC189 and SC183 are small form factor products that deliver 1 A, 1.5 A and 2 A of load current, respectively, with excellent transient response.

The devices are the newest members of Semtech's platform of point of load buck regulators. The combination of internal compensation and a high switching frequency of 2.5 MHz yields a solution foot print of 25mm² with under 1mm profile, which is crucial for many space constrained applications. They are offered in SOT23-5 (2 x 2 x 0.6 mm) package, or a MLP (3 x 3 x 0.6 mm) package, depending on the output current required.

Each of the regulators also delivers a high conversion efficiency for demanding point of load regulation applications. The SC183 is a 2 A buck regulator that offers four VID pins to select from sixteen output voltages, which may be adjusted on the fly (Dynamic Voltage Scaling) for energy efficiency. This feature also reduces inventory management cost.

Each of these new products also caters to complex dynamic loads with excellent load transient response and settling time. All step-down regulators are compatible with multi-layer ceramic input and output filter capacitors that reduce system cost and improve reliability. Low noise and ripple, a critical requirement for deep sub-micron CMOS loads, is inherent in the combination of higher switching frequency, control loop bandwidth and multi-layer ceramic filter capacitors. In certain cases chip filter inductors may be used to increase power density without compromising electrical performance.

Key Features of the SC4626, SC189 & SC183

  • 2.9 V to 5.5 V input voltage range
  • Fixed VOUT options (1.0 V to 3.3 V) or adjustable
  • Available in 1.0 A, 1.5 A and 2.0 A output current
  • 2.5 MHz switching frequency (above ADSL2+ band)
  • 100% duty cycle, low drop-out operation
  • Over-current, over-voltage, over-temperature and short-circuit protection
  • Four VID pins to select from sixteen different output voltages (SC183 Only)
  • Dynamic voltage scaling (SC183 Only)
  • Start-up into pre-bias loads
  • 2x2x0.6 mm MLPD-UT6, 3x3x0.6 mm MLPQ-UT16 or SOT23-5 packages

Pricing and Availability

All of the new buck regulators are available immediately in production quantities. The SC4626 (order code: SC4626XSKTRT) is priced at $0.38 each in 3,000-piece lots. The SC189 with SOT23-5 package (order code: SC189XSKTRT) is priced at $0.39 each in 3,000-piece lots; the same part in the MLPD-UT6 package (order code: SC189XULTRT) is priced at $0.42 each. And, the SC183 (order code: SC183CULTRT) is priced at $0.46 each in 3,000-piece lots. Semtech offers comprehensive design assistance, including field- and factory-based support. Data sheets, volume pricing, and delivery quotes, as well as evaluation kits and samples, are available by contacting

About Semtech

Semtech Corporation is a leading supplier of analog and mixed-signal semiconductors for high-end consumer, computing, communications and industrial equipment. Products are designed to benefit the engineering community as well as the global community. The company is dedicated to reducing the impact it, and its products, have on the environment. Internal green programs seek to reduce waste through material and manufacturing control, use of green technology and designing for resource reduction. Publicly traded since 1967, Semtech is listed on the NASDAQ Global Select Market under the symbol SMTC. For more information, visit

Press Contact

Pauline Cadena, Public Relations, Telephone: (805) 389-2755


  • 2014
    6 Announcements
  • 2013
    18 Announcements
  • 2012
    20 Announcements
  • 2011
    23 Announcements
  • 2010
    29 Announcements