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## TPS22810 Datasheet(PDF) 14 Page - Texas Instruments

 Part # TPS22810 Description 2.7-18-V, On-Resistance Load Switch With Thermal Protection Download 35 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

## TPS22810 Datasheet(HTML) 14 Page - Texas Instruments

 14 / 35 page14TPS22810SLVSDH0B – DECEMBER 2016 – REVISED MAY 2017www.ti.comProduct Folder Links: TPS22810Submit Documentation FeedbackCopyright © 2016–2017, Texas Instruments IncorporatedFeature Description (continued)•QOD pin is unused and left floating. Using this method, there is no quick output discharge functionality, andthe output remains floating after the switch is disabled.Note that during thermal shutdown, the QOD functionality is not available. The device does not discharge theload as RPD does not become engaged.The fall times of the device depend on many factors including the total resistance of the QOD, VIN, and theoutput capacitance. When QOD is connected to VOUT, the fall time changes over VIN as the internal RPD variesover VIN. To calculate the approximate fall time of VOUT for a given RQOD, use Equation 2 and Table 1.VCAP = VIN × e-t/τwhere•VCAP is the voltage across the capacitor (V)•t is the time since power supply removal (s)•τ is the time constant equal to RQOD × CL(2)The fall times' dependency on VIN becomes minimal as the QOD value increases with additional externalresistance. See Table 1 for QOD fall times.(1)TYPICAL VALUES WITH QOD SHORTED TO VOUTTable 1. QOD Fall TimesVIN (V)FALL TIME (μs) 90% - 10%, CIN = 1 μF, IOUT = 0 A , VIN = 0 V, ON = 0 V(1)TA = 25°CTA = 85°CCL = 1 μFCL = 10 μFCL = 100 μFCL = 1 μFCL = 10 μFCL = 100 μF1847047004700047047004700012450450045000450450045000944044004400044044004400055005000500004804800480003.36006000600005705700570009.3.2.1 QOD when System Power is RemovedThe adjustable QOD can be used to control the power down sequencing of a system even when the systempower supply is removed. When the power is removed, the input capacitor, CIN, discharges at VIN. Past the setUVLO level, the pull-down resistance RPD becomes disabled and the output no longer becomes discharged. Ifthere is still remaining charge on the output capacitor, this results in longer fall times. Care must be taken suchthat CIN is large enough to meet the device UVLO settings.9.3.2.2 Internal QOD ConsiderationsSpecial considerations must be taken when using the internal RPD by shorting the QOD pin to the VOUT pin. Theinternal RPD is a pulldown resistance designed to quickly discharge a load after the switch has been disabled.Care must be used to ensure that excessive current does not flow through RPD during discharge so that themaximum TJ of 125°C is not exceeded. When using only the internal RPD to discharge a load, the total capacitiveload must not exceed 200 uF. Otherwise, an external resistor, REXT, must be used to ensure the amount ofcurrent flowing through RPD is properly limited and the maximum TJ is not exceeded. To ensure the device is notdamaged, the remaining charge from CL needs to decay naturally through the internal QOD resistance and mustnot be driven.9.3.3 EN/UVLOAs an input pin, EN/UVLO controls the ON and OFF state of the internal MOSFET. In its high state, the internalMOSFET is enabled. A low on this pin turns off the internal MOSFET. High and Low levels are specified in theparametric table of the datasheetA voltage V(EN/UVLO < V(ENF) on this pin turns off the internal FET, thus disconnecting VIN from VOUT, whilevoltage below V(SHUTF) takes the device into shutdown mode, with IQ less than 1 μA to ensure minimal powerloss.

## Similar Part No. - TPS22810_17

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## Similar Description - TPS22810_17

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