TPS22980RGPR datasheet(7/18 Pages) TI1

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RISET_S0/S3/V3P3 - W

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RISET_S0/S3/V3P3 - W

ISET

LIMmin

40 kΩ

Amps

TPS22980

www.ti.com

SLVSB61B – DECEMBER 2011 – REVISED APRIL 2012

CURRENT LIMIT THRESHOLD

Figure 4. ILIM vs RSET for VHV and V3P3

Figure 5. Percent Variance from min ILIM vs RSET

Figure 4 shows the minimum, typical, and maximum current limit for either supply versus its corresponding RISET

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

Figure 5 shows the approximate variation from the set minimum ILIM value to the typical and maximum ILIM

values.

(1)

where:

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

ILIMmin = current limit for V3P3, VHV (S0), or VHV (S3) set by the external RISET resistor.

Each resistor is placed between the corresponding ISET pin and GND, as shown in Figure 3, providing a

minimum current limit between 100mA and 1.5A.

TRANSITION DELAYS

Output transitions of the TPS22980 voltages are shown in Figure 6. 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 (IDIS) pulls OUT down. If a load on the line is also pulling OUT down, the output can

drop to 0V due to the switch off time of T3P3OFF. Figure 7 shows the voltage drop on the output during this

transition with no output capacitance.

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