Datasheet

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Push-Button ON-OFF (PB-ON-OFF)
PB_IN
PB_IN
PB_OUT
Debounce
32ms
MinPulse
Width32ms
32ms
JK-
Flipflop
Default
Low
Vbat
RESPWRON
Short-Circuit Protection
Thermal Shutdown
TPS65050, TPS65051, TPS65052
TPS65054, TPS65056
SLVS710A – JANUARY 2007 – REVISED AUGUST 2007
The TPS65050 provides a PB-ON-OFF functionality instead of supervising a voltage with the threshold and
hysteresis inputs. The output at PB_OUT is held low after voltage is applied at V
CC
. Only after the input at PB-IN
is pulled high once, the output driver at PB_OUT goes to its inactive state, driven high with its external pullup
resistor. Further low-high pulses at PB-IN toggles the status of the PB_OUT output, and can be used to
shutdown and start the converter with a single push on a button by connecting the PB_OUT output to the enable
input of the converters.
Figure 22. Push-Button Circuit
All outputs are short-circuit protected with a maximum output current as defined in the Electrical Characteristics.
As soon as the junction temperature, T
J
, exceeds 150 ° C (typically) for the DC/DC converters, the device goes
into thermal shutdown. In this mode, the P and N-Channel MOSFETs are turned-off. The device continues its
operation when the junction temperature falls below the thermal shutdown hysteresis again. A thermal shutdown
for one of the DC/DC converters disables both converters simultaneously.
The thermal shutdown temperature for the LDOs are set to typically 140 ° C. Therefore, a LDO which may be
used to power an external voltage never heats up the chip high enough to turn off the DC/DC converters. If one
LDO exceeds the thermal shutdown temperature, all LDOs turns off simultaneously.
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Product Folder Link(s): TPS65050, TPS65051, TPS65052 TPS65054, TPS65056