TPS22980RGPR datasheet(6/18 Pages) TI1

6 / 18 page

IREF_HV

IREF_V3P3

OUT

VHV

4.5 - 18V

3.3V

Switch

CTRL

Logic

ISET_V3P3

ISET_S3

ISET_S0

RSET_V3P3

RSET_S3

RSET_S0

TPS22980

SLVSB61B – DECEMBER 2011 – REVISED APRIL 2012

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APPLICATION INFORMATION

CURRENT LIMIT

The TPS22980 provides current limiting in the power switches. Both the VHV supply current limit and the V3P3

supply current limit are adjustable by external resistors.

Figure 2 shows a simplified view of the TPS22980 current limit function. Both the VHV supply current limit and

the V3P3 supply current limit are adjustable by external resistors.

Figure 2. Simplified Current Limit Diagram

The current limit thresholds, IREF_HV and IREF_V3P3, are set with three external resistors as shown in Figure 3.

When the TPS22980 is passes the V3P3 voltage, the current limit is set by RISET_V3P3. The VHV path has two

modes that support two different current limits which are selected by the S0 pin. When S0 is asserted high,

RISET_S0 sets the current limit. When S0 is low, RISET_S3 sets the current limit. This allows the system to have two

separate VHV current limits for different modes such as active and sleep.

Figure 3. External RSET Resistances to Set Current Limits

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TPS22980RGPR Datasheet(PDF) 6 Page - Texas Instruments