259481A Marking, TPS259481AYWPR datasheet(40/56 Pages) TI

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TPS259480x

OUT

EN/UVLO

VIN1

VOUT

COUT

OVLO

SPLYGD

VLOGIC

TPS259480x

OUT

EN/UVLO

VIN2

OVLO

SPLYGD

FLT

IN1 supply active

IN2 supply active

ILM

dVdt

GND

ITIMER

ILM

dVdt

GND

ITIMER

VLOGIC

Figure 9-14. Priority Power MUXing With 2 × TPS259480x - Option 1

This configuration provides the most compact priority power MUXing solution with multiple benefits, including

active current limit protection on both channels as well as overvoltage protection on primary channel. It also

provides the fastest switchover time from primary to auxiliary, but at the cost of a slightly increased quiescent

current on the auxiliary path while primary path is active. Also, it uses the fewest external components, but at the

cost of bypassing overvoltage protection on auxiliary channel.

The following waveforms illustrate the TPS259480x performance in a priority power MUXing configuration.

Figure 9-15. TPS259480x Power MUX - Switchover

Between Primary and Auxiliary Supplies

Figure 9-16. TPS259480x Power MUX - Switchover

Between Primary and Auxiliary Supplies

ere is a possible variation to the above configuration in case overvoltage protection is needed on both channels.

This needs an additional signal N-FET to drive the OVLO pin of the auxiliary path device as shown in Figure

9-17. The switchover times are similar to the previous configuration.

TPS25948

SLVSGT9A – FEBRUARY 2023 – REVISED SEPTEMBER 2023

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