TPS22970YZPR datasheet(10/22 Pages) TI1

Part #	TPS22970YZPR

Description	3.6-V, 4-A, 5.3-m(ohm) On-Resistance Load Switch

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SMPS

ON

OFF

TPS22970

V

IN

V

OUT

R

L

C

L

GND

ON

GND

C

IN

J(max)

A

D(max)

JA

T

P

-

=

θ

10

TPS22970

SLVSDF2 – MAY 2017

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Product Folder Links: TPS22970

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9 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.

9.1 Application Information

9.1.1 Input Capacitor (CIN)

It is recommended to use a capacitor between VIN and GND close to the device pins. This helps limit the voltage

droop on the input supply caused by transient inrush currents when the switch is turned on into a discharged

capacitor at the load. A 1-μF ceramic capacitor, CIN, is usually sufficient. Higher values of CIN can be used to

further reduce the voltage droop.

9.1.2 Output Capacitor (CL)

A CIN greater than CL is highly recommended due to the integrated body diode in the NMOS switch. A CL greater

than CIN can cause VOUT to exceed VIN when the system supply is removed. This could result in current flow

through the body diode from VOUT to VIN.

9.1.3 Thermal Consideration

It is recommended to limit the junction temperature (TJ) to below 125°C. To calculate the maximum allowable

dissipation, PD(max) for a given output current and ambient temperature, use Equation 1 as a guideline:

where

•

PD(max) is maximum allowable power dissipation

•

TJ(max) is maximum allowable junction temperature

•

TA is ambient temperature of the device

•

ΘJA is junction to air thermal impedance. See the Thermal Information section. This parameter is highly

dependent upon board layout

(1)

9.2 Typical Application

Figure 3. Typical Application Circuit

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