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TPS22810 Datasheet(PDF) 18 Page - Texas Instruments

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

TPS22810 Datasheet(HTML) 18 Page - Texas Instruments

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Power
Supply
EN/
UVLO
GND
VIN
CT
VOUT
OFF
ON
TPS22810
QOD
Copyright © 2016, Texas Instruments Incorporated
CL
RL
CIN
18
TPS22810
SLVSDH0B – DECEMBER 2016 – REVISED MAY 2017
www.ti.com
Product Folder Links: TPS22810
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
This section highlights some of the design considerations when implementing this device in various applications.
A PSPICE model for this device is also available in the product page of this device on www.ti.com (See the
Device Support section for more information).
10.1.1 ON and OFF Control
The EN/UVLO pin controls the state of the switch. Asserting EN/UVLO high enables the switch. EN/UVLO is
active high and has a low threshold, making it capable of interfacing with low-voltage signals. The EN/UVLO pin
is compatible with standard GPIO logic thresholds. It can be used with any microcontroller with 1.2 V or higher
GPIO voltage. This pin cannot be left floating and must be driven either high or low for proper functionality.
10.1.2 Input Capacitor (Optional)
To limit the voltage drop on the input supply caused by transient inrush currents when the switch turns on into a
discharged load capacitor, a capacitor needs to be placed between VIN and GND. A 1-μF ceramic capacitor, CIN,
placed close to the pins, is usually sufficient. Higher values of CIN can be used to further reduce the voltage drop
during high current applications. When switching heavy loads, it is recommended to have an input capacitor
about 10 times higher than the output capacitor to avoid excessive voltage drop.
10.1.3 Output Capacitor (Optional)
Due to the integrated body diode in the NMOS switch, a CIN greater than CL is highly recommended. A CL
greater than CIN can cause VOUT to exceed VIN when the system supply is removed. This can result in current
flow through the body diode from VOUT to VIN. A CIN to CL ratio of 10 to 1 is recommended for minimizing VIN
dip caused by inrush currents during startup; however, a 10 to 1 ratio for capacitance is not required for proper
functionality of the device. A ratio smaller than 10 to 1 (such as 1 to 1) can cause slightly more VIN dip upon
turnon due to inrush currents.
This can be mitigated by increasing the capacitance on the CT pin for a longer rise time.
10.2 Typical Application
This typical application demonstrates how the TPS22810 can be used to power downstream modules.
Figure 21. Typical Application Schematic


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