Datasheet

ISET_V3P3
ISET_S3
ISET_S0
RSET_V3P3
RSET_S3
RSET_S0
I
REF_HV
I
REF_V3P3
OUT
VHV
4.5 - 18V
3.3V
Switch
CTRL
Logic
TPS22980
SLVSB61C –DECEMBER 2011–REVISED SEPTEMBER 2013 www.ti.com
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, I
REF_HV
and I
REF_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 R
ISET_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,
R
ISET_S0
sets the current limit. When S0 is low, R
ISET_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 R
SET
Resistances to Set Current Limits
CURRENT LIMIT THRESHOLD
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