TPS65281, TPS65281-1

SLVSBH7B – JULY 2012 – REVISED DECEMBER 2012

www.ti.com

The buck DC/DC converter integrates power MOSFETs for optimized power efficiency and reduced external

component count. A wide 4.5-V to 18-V input supply range to buck encompasses most intermediate bus voltages

operating off 5-V, 9-V, 12-V or 15-V power bus. Constant frequency peak current mode control simplifies the

compensation and provides fast transient response. The buck can be precisely sequenced and ramp up in order

to align with other rails in the system with the soft-start pin. With SS pin floating, the built-in 1ms soft-start time

prevents in-rush current. Cycle-by-cycle over current protection and hiccup operation limit MOSFET power

dissipation in short circuit or over loading fault conditions. The switching frequency of the converter can be

programmed from 300 kHz to 1.4 MHz with an external resistor at ROSC pin. With ROSC pin connecting to V7V

pin, floating, or grounding, a default fixed switching frequency can be selected to reduce an external resistor.

The TPS65281/TPS65281-1 is available in a 16-lead thermally enhanced QFN (RGV) 4-mm x 4-mm thin

package.

ORDERABLE PART NUMBER

TOP-SIDE MARKING

TPS65281RGVR

TPS65281

TPS65281RGVT

–40°C to 85°C

16-Pin QFN (RGV)

TPS65281-1RGVR

TPS65281-1

TPS65281-1RGVT

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

2

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Product Folder Links: TPS65281 TPS65281-1