TPS22981RGPR datasheet(10/27 Pages) TI1

10 / 27 page

LIMMAX

SET

41571

+ 0.0161 A

LIMMIN

SET

38429

– 0.0161 A

SET

LIMTYP

40 k

Amps

W ´

-25%

-20%

15%

10%

-5%

10%

15%

20%

25%

100

150

200

250

300

350

400

450

RSET_S0/S3/V3P3 (k )

min

typ

max

200

400

600

800

1000

1200

1400

1600

1800

100

150

200

250

300

350

400

450

RSET_S0/S3/V3P3 (k )

min

typ

max

TPS22981

SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015

www.ti.com

Feature Description (continued)

7.3.2 Current Limit Threshold

Figure 3. ILIM vs RSET for VHV and V3P3

Figure 4. % Variance from Minimum ILIM vs RSET

Figure 3 shows the minimum, typical, and maximum current limit for either supply versus its corresponding RSET

value. Equation 1 is used to determine the RSET needed to set a typical ILIM for a given supply and mode.

Figure 4 shows the percent variation from the typical ILIM value to the minimum and maximum ILIM values.

SPACE

where

•

RSET = external resistor used to set the current limit for V3P3, VHV (S0), or VHV (S3)

•

ILIMTYP = typical current limit for V3P3, VHV (S0), or VHV (S3) set by the external RSET resistor.

(1)

SPACE

Each resistor is placed between the corresponding ISET pin and GND, as shown in Figure 2, providing a

minimum current limit between 100mA and 1.5A. For a given RSET the minimum current limit and the maximum

current limit are determined by Equation 2 and Equation 3.

SPACE

(2)

SPACE

(3)

SPACE

7.3.3 Maximum Current Limit Threshold

The TPS22981 has a maximum current limit ILIMVHVMAX and ILIM3P3MAX. This prevents excessive current in the

case of an ISET pin being shorted to ground.

7.3.4 Transition Delays

Output transitions of the TPS22981 voltages are shown in Figure 5. When the device transitions from VHV to V3P3

at the output, the power switches both turn off until the output falls to near the V3P3 voltage. During this time, a

discharge current of IDIS pulls OUT down. If a load is also pulling current from OUT, the output will drop to near 0

V due to the switch OFF-time of T3P3OFF.

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