TPS22916_17 Datasheet, PDF (17/29 Pages) Texas Instruments – 1-V – 5.5-V, 2-A, 60-m(ohm) Ultra-Low Leakage Load Switch

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TPS22916
SLVSDO5A – JULY 2017 – REVISED SEPTEMBER 2017
Feature Description (continued)
The output fall time is determined by how quickly the load capacitance is discharged and can be found using
Equation 1 .
t_FALL = - (R_DIS) × C_L × ln(V_10%/V_90%)
Where
• V_10% is 10% of the initial output voltage
• V_90% is 90% of the initial output voltage
• R_DIS is the result of the QOD resistance in parallel with the Load Resistance R_L
• C_L is the load capacitance
(1)
With the Quick Output Discharge feature, the QOD resistance is in parallel with R_L. This provides a lower total
load resistance as seen from the load capacitance which discharges the capacitance faster resulting in a smaller
t_FALL.
8.3.3 Full-Time Reverse Current Blocking
In a scenario where the device is enabled and V_OUT is greater than V_IN there is potential for reverse current to
flow through the pass FET or the body diode. When the reverse current threshold (I_RCB) is exceeded, the switch
is disabled within t_RCB. The Switch will remain off and block reverse current as long as the reverse voltage
condition exists. Once V_OUT has dropped below the V_RCB release threshold the TPS22916xx will turn back on
with slew rate control.
8.4 Device Functional Modes
Table 1 describes the state for each variant as determined by the ON pin
ON
≤ V_IL
≥ V_IH
TPS22916B
Disabled
Enabled
Table 1. Device Function Table
TPS22916C
Disabled
Enabled
TPS22916CN
Disabled
Enabled
Table 2 shows when QOD is active for each variant.
TPS22916CL
Enabled
Disabled
Device
Enabled
Disabled
TPS22916B
No
Yes
Table 2. QOD Function Table
TPS22916C
No
Yes
TPS22916CN
No
No
Table 3 shows when the ON Pin Smart Pull Down is active.
TPS22916CL
No
Yes
Table 3. Smart-ON Pull Down
V_ON
≤ V_IL
≥ V_IH
Pull Down
Connected
Disconnected
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