TPS22981RGPR datasheet(9/19 Pages) TI

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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 (kΩ)

min

typ

max

TPS22981

www.ti.com

SLVSBM6 – DECEMBER 2012

CURRENT LIMIT THRESHOLD

Figure 6. ILIM vs RSET for VHV and V3P3

Figure 7. % Variance from min ILIM vs RSET

Figure 6 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 7 shows the percent variation from the typical ILIM value to the minimum and maximum ILIM values.

(1)

Where

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

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

Each resistor is placed between the corresponding ISET pin and GND, as shown in Figure 5, 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.

(2)

(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.

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