TPS65280

SLVSBE4 – JUNE 2012

www.ti.com

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

component count for a fixed 5-V output voltage. A wide 5.5-V to 18-V input supply range to buck encompasses

most intermediate bus voltages operating off a 9-V, 12-V or 15-V power bus. Constant frequency peak current

mode control simplifies the compensation and fast transient response. Equipped with enable and soft-start pins,

the DC/DC can be precisely sequenced and ramp up in order to align with other rails in the system. Cycle-by-

cycle over-current protection and operating in hiccup mode limit MOSFET power dissipation during buck output

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 the ROSC pin. With the ROSC pin connecting to the V7V pin,

floating, or grounding, a default fixed switching frequency can be selected to reduce the external component. The

internal oscillator can be synchronized with a free-run external clock in frequency.

When continuous heavy overload or short circuit increases power dissipation in the buck converter or power

switches, the internal thermal protection circuit shuts off both the buck regulator and power switches to prevent

damage. Recovery from a thermal shutdown is automatic once the device has cooled sufficiently.

The TPS65280 is available in a 24-lead thermally enhanced QFN (RGE) 4-mm x 4-mm thin package.

ORDERABLE PART NUMBER

TOP-SIDE MARKING

Reel 3000

TPS65280RGER

–40°C to 85°C

24-Pin QFN (RGE)

TPS65280

Reel 250

TPS65280RGET

(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 Link(s): TPS65280