UCC28950

SLUSA16 – MARCH 2010

www.ti.com

DESCRIPTION (CONT.)

The UCC28950 also offers multiple light-load management features including burst mode and dynamic SR on/off

control when transitioning in and out of Discontinuous Current Mode (DCM) operation, ensuring ZVS operation is

extended down to much lighter loads.

In addition, the UCC28950 includes support for peak current along with voltage mode control, programmable

switching frequency up to 1 MHz and a wide set of protection features including cycle-by-cycle current limit,

UVLO and thermal shutdown. A 90-degree phase-shifted interleaved synchronized operation can be easily

arranged between two converters.

The UCC28950 is available in TSSOP-24 package.

ORDERING INFORMATION

PACKAGE

TAPE AND REEL QTY.

PART NUMBER

250

UCC28950PW

-40°C to 125°C

Plastic 24-pin TSSOP (PW)

2000

UCC28950PWTR

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range (unless otherwise noted)

(1) (2)

PARAMETER

VALUE

UNIT

(3)

-0.4 to 20.0

OUTA, OUTB, OUTC, OUTD, OUTE, OUTF

-0.4 to VDD + 0.4

Inputs voltages on DELAB, DELCD, DELEF, SS/EN, DCM, TMIN, RT, SYNC, RSUM, EA+, EA-,

-0.4 to VREF +

COMP, CS, ADEL, ADELEF

0.4

V

Output voltage on VREF

-0.4 to 5.6

ESD rating, HBM

2 k

ESD rating, CDM

500

Continuous total power dissipation

See dissipation rating table

-40 to 150

-40 to 125

°C

-65 to 150

Lead temperature (soldering, 10 sec.)

300

(1)

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating

conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

These devices are sensitive to electrostatic discharge; follow proper device handling procedures.

(3)

All voltages are with respect to GND unless otherwise noted. Currents are positive into, negative out of the specified terminal. See

Packaging Section of the datasheet for thermal limitations and considerations of packages.

DISSIPATION RATINGS

(1)

DERATING

POWER RATING

FACTOR

PACKAGE

(°C/W)

(°C/W)

25°C

PW

18.5

89.3

11.2 mW/ °C

1.12 W

0.615 W

0.448 W

(1)

These thermal data are taken at standard JEDEC test conditions and are useful for the thermal performance comparison of different

packages. The cooling condition and thermal impedance RqJA of practical design is specific.

2

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