UCC28521, UCC28528

SLUS608D − JANUARY 2005 REVISED NOVEMBER 2005

3

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ABSOLUTE MAXIMUM RATINGS

Supply voltage VCC

Idle

20 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating

18 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Gate drive current (GT1, GT2)

Continuous

0.4 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pulsed

Sourcing

−2.5 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sinking

3.5 A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum GT1, GT2 voltage

−0.5 V to VCC+0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage

VSENSE

0 V to 11 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

D_MAX, SS2, CAOUT, ISENSE1, MOUT, VFF

−0.5 V to VREF+0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VAOUT, CT_BUFF, ISENSE2, PKLMT

−0.5 V to 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pin Current

RT

−0.5 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VFF

−5 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CT_BUFF

1 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VAOUT, VERR, ISENSE2, SS2, CAOUT, IAC

10 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum pin capacitance

ISENSE2

220 pF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1.6mm (1/16 inch from case for 10 seconds)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† 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 reliability.

‡ Currents are positive into, negative out of the specified terminal. All voltages are referenced to GND.

ELECTROSTATIC DISCHARGE (ESD) PROTECTION

PARAMETER

MAX

UNITS

Human body model

2.5

kV

CDM

0.5

kV

AVAILABLE OPTIONS

{}

OPTIONS

PACKAGED

DEVICES

PFC:PWM

FREQUENCY

RATIO

UVLO

TURN-ON (V)

UVLO

HYSTERESIS (V)

PWM UVLO2

TURN-OFF (V)

PWM UVLO2

HYSTERESIS (V)

SOIC W−20

(DW)

1:1

10.2

0.5

5.30

1.45

UCC28521DW

1:1

10.2

0.5

−

−

UCC28528DW

† The DW package is available taped and reeled. Add R suffix to device type (e.g. UCC28512DWR) to order quantities of 2,000 devices per reel.

‡ All devices are rated from −40°C to +105°C.

AVAILABLE OPTIONS

{

PACKAGE

THERMAL

IMPEDANCE

JUNCTION TO

AMBIENT

THERMAL

IMPEDANCE

JUNCTION TO

CASE

TA < 25°C

POWER RATING

TA < 25°C

DERATING

FACTOR

TA < 105°C

POWER RATING

8-pin plastic SOIC

(DW)

84.3

°C/W

16.4

°C/W

1.5 W

84.3 mW/

°C

0.5 W

† Based on low−K PCB ∅ LFM.