SP6134 Datasheet, PDF (1/15 Pages) Sipex Corporation – Dual Supply Synchronous Buck Controller

January 2009
SP6134
600kHz Synchronous PWM Step Down Controller
Rev. 2.0.0
GENERAL DESCRIPTION
The SP6134 is a 600kHz constant frequency,
voltage mode, synchronous PWM step down
controller optimized for high efficiency.
The SP6134 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 SP6134 can accommodate type
II and type III compensation schemes.
Protection features include a programmable
UVLO, thermal shutdown and output short
circuit protection.
The SP6134 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 SP6134H,
SP6132, SP6132H, SP6137 and SP6139 for
complete details.
The SP6134 is available in lead free, RoHS
compliant, space saving 10-pin MSOP
package.
APPLICATIONS
• 12V DPA
• Communications Systems
• Graphics Cards
FEATURES
• 3V to 15V Step Down Achieved Using
Dual Input
• On-Board 1.5Ω sink (2Ω source) NFET
Drivers
• Up to 15A Output Capability
• UVLO Detects Both VCC and VIN
• Short-Circuit Protection with Auto-
Restart
• Supports Type II or III Compensation
• Programmable Soft Start
• Fast Transient Response
• High Efficiency: Greater than 94%
• Non-synchronous Start-Up
• Small 10-Pin MSOP Package
• U.S. Patent #6,922,041
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6134 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]