UCC28950-Q1

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SLUSAG4A – APRIL 2011 – REVISED JULY 2012

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

DESCRIPTION (CONT.)

The UCC28950-Q1 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-Q1 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. It is easy to arrange 90-degree phase-shifted interleaved synchronized operation

between two converters.

The UCC28950-Q1 is available in a TSSOP-24 package.

ORDERING INFORMATION

PACKAGE

ORDERABLE PART NUMBER

TOP-SIDE MARKING

–40°C to 105°C

TSSOP (PW)

Reel of 2000

UCC28950TPWRQ1

UCC28950Q

–40°C to 125°C

TSSOP (PW)

Reel of 2000

UCC28950QPWRQ1

U28950Q

ABSOLUTE MAXIMUM RATINGS

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

(1) (2)

PARAMETER

VALUE

UNIT

(3)

–0.4 to 20

OUTA, OUTB, OUTC, OUTD, OUTE, OUTF

V

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

COMP, CS, ADEL, ADELEF

Output voltage on VREF

–0.4 to 5.6

Continuous total power dissipation

See dissipation rating table

–40 to 150

°C

–65 to 150

°C

(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 the

Package Options Addendum of the data sheet for thermal limitations and considerations of packages.

THERMAL INFORMATION

UCC28950-Q1

PW

UNIT

24 PINS

Junction-to-ambient thermal resistance

93.3

°C/W

Junction-to-case (top) thermal resistance

24.2

°C/W

Junction-to-board thermal resistance

47.9

°C/W

Junction-to-top characterization parameter

0.7

°C/W

Junction-to-board characterization parameter

47.4

°C/W

(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

Copyright © 2011–2012, Texas Instruments Incorporated

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