900KHz PWM Switching Controller


The SP6137 is a 900kHz constant frequency, voltage mode, synchronous PWM step-down controller optimized for high efficiency.

The SP6137 is adequately suited for split plane applications utilizing a low power 5V rail to power the controller circuitry, minimizing power dissipation. Its wide input voltage range of 3V to 15V allows for conversions from the standard 3.3V, 5V, 9.6V and 12V power rails to an output voltage adjustable down to 0.8V. Developed around a wide bandwidth internal amplifier, the SP6137 can accommodate type II and type III compensation schemes.

Protection features include a programmable UVLO, thermal shutdown and output short circuit protection.

The SP6137 is part of a larger family of step-down controllers operating at various switching frequencies up to 1300kHz and input voltages up to 28V. Refer to Exar’s SP6132, SP6132H, SP6134, SP6134H and SP6139 for complete details.

The SP6137 is available i-n lead free, RoHS compliant, space saving 10-pin MSOP package.

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  • 2.5V to 20V step-down achieved using dual input
  • On-board 1.5Ω sink (2Ω source) NFET drivers
  • Up to 25A output capability
  • Small 10-PiMSOP package
  • Highly integrated design, minimal components
  • UVLO detects both VCC and VIN
  • Short circuit protection with auto restart
  • Programmable soft-start
  • Fast transient response
  • High efficiency: greater than 94% possible
  • Asynchronous startup into a pre-charged output


Design Tools

Reference Designs


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-187
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 214.0ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack:
  • Quantity per Reel: 2500
  • Quantity per Tube: 50
  • 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: 3
  • Width: 3
  • Thickness: 0.85
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
SP6137CU MSOP10 0 70 OBS
SP6137CU/TR MSOP10 0 70 OBS
SP6137CU-L MSOP10 0 70 OBS Suggested:
SP6137CU-L/TR MSOP10 0 70 OBS Suggested:
SP6137EU MSOP10 -40 85 OBS
SP6137EU/TR MSOP10 -40 85 OBS
SP6137EU-L MSOP10 -40 85 OBS Suggested:
SP6137EU-L/TR MSOP10 -40 85 OBS Suggested:
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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.
Distribution Date Description File
07/20/2015 Product discontinuation notification PDN_15-0105-01-1033.pdf
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand PDN_090304-01-1033.pdf
01/20/2009 Datasheet Changes Refer to PCN for more details. PCN_09-0120-01-1033.pdf
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued. POL_022807-1033.pdf