Datasheet

UCC28950
SLUSA16B –MARCH 2010– REVISED OCTOBER 2011 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
TEMPERATURE RANGE, T
A
=
PACKAGE TAPE AND REEL QTY. PART NUMBER
T
J
250 UCC28950PW
-40°C to 125°C Plastic 24-pin TSSOP (PW)
2000 UCC28950PWR
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
(1)(2)
PARAMETER VALUE UNIT
Input supply voltage range, V
DD
(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
Operating virtual junction temperature range, T
J
-40 to 150
Operating ambient temperature range, T
A
-40 to 125
°C
Storage temperature, T
stg
-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
R
θJC
R
θJA
PACKAGE
(°C/W) (°C/W)
ABOVE T
A
=
T
A
< 25°C T
A
= 70°C T
A
= 85°C
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 RθJA of practical design is specific.
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