TPS73HD301, TPS73HD318, TPS73HD325

DUALOUTPUT LOW DROPOUT VOLTAGE REGULATORS

SLVS167C − SEPTEMBER 1998 − REVISED − MAY 1999

3

POST OFFICE BOX 655303

−0.3 V to 11 V

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

2 V

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

2 A

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

Continuous total power dissipation

See Dissipation Rating Tables

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

−40

°C to 125°C

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

−65

°C to 150°C

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

Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds

260

°C

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

† 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.

NOTE 1: All voltages are with respect to GND.

DISSIPATION RATING TABLE 1 − FREE-AIR TEMPERATURES‡

PACKAGE

AIR FLOW

(CFM)

TA < 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

PWP‡

0

2.9 W

23.5 mW/

°C

1.9 W

1.5 W

PWP‡

300

4.3 W

34.6 mW/

°C

2.8 W

2.2 W

PWP§

0

3 W

23.8 mW/

°C

1.9 W

1.5 W

PWP§

300

7.2 W

57.9 mW/

°C

4.6 W

3.8 W

‡ This parameter is measured with the recommended copper heat sink pattern on a 1-layer PCB, 5-in × 5-in PCB, 1 oz. copper,

2-in

× 2-in coverage (4 in2).

§ This parameter is measured with the recommended copper heat sink pattern on a 8-layer PCB, 1.5-in × 2-in PCB, 1 oz. copper

with layers 1, 2, 4, 5, 7, and 8 at 5% coverage (0.9 in2) and layers 3 and 6 at 100% coverage (6 in2).

recommended operating conditions

MIN

MAX

UNIT

Input voltage, VI†

Adjustable output (regulator #1)

2.97

10

V

Input voltage, VI†

3.3−V output (regulator #2)

3.97

10

V

High-level input voltage at EN, VIH

2

V

Low-level input voltage at EN, VIL

0.5

V

Total output current range (per regulator), IO

0

750

mA

Operating virtual junction temperature range, TJ

−40

125

°C

† Minimum input voltage defined in the recommended operating conditions is the maximum specified output voltage plus dropout voltage, VDO,

at the maximum specified load range (750 mA). Since dropout voltage is a function of output current, the usable range can be extended for lighter

loads. To calculate the minimum input voltage for the maximum load current used in a given application, use the following equation:

V

I(min) +

V

O(max) )

V

DO(max load)

Because regulator 1 of the TPS373HD301 is programmable, rDS(on) should be used to calculate VDO before applying the above equation. The

equation for calculating VDO from rDS(on) is given in Note 3 in the TPS73HD301 electrical characteristics table. The minimum value of 3.5 V is

the absolute lower limit for the recommended input voltage range for the TPS73HD301. With 2.97-V input voltage, the LDO may be in dropout

and will not meet the 3% regulaotr output or 750-mA load current specification.