TPS782xx

GND

EN

IN

OUT

V

IN

V

OUT

1 F

m

1 F

m

On

Off

TPS782

SBVS115D – AUGUST 2008 – REVISED JANUARY 2015

www.ti.com

7.4.3 Disabled

The device is disabled under the following conditions:

•

The enable voltage is less than the enable falling threshold voltage or has not yet exceeded the enable rising

threshold.

•

The device junction temperature is greater than the thermal shutdown temperature (TJ > TSD).

8 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.

8.1 Application Information

The TPS782 family of LDOs is factory-programmable to have a fixed output. Note that during startup or steady-

state conditions, it is important that the EN pin voltage never exceed VIN + 0.3V.

8.2 Typical Application

Figure 23. Typical Application Circuit

8.2.1 Design Requirements

Select the desired device based on the output voltage.

Provide an input supply with adequate headroom to account for dropout and output current to account for the

GND pin current, and power the load. Select input and output capacitors based on application needs.

8.2.2 Detailed Design Procedure

8.2.2.1 Input and Output Capacitor Requirements

Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1-

μF to

1.0-

μF low equivalent series resistance (ESR) capacitor across the input supply near the regulator. This

capacitor counteracts reactive input sources and improves transient response, noise rejection, and ripple

rejection. A higher-value capacitor may be necessary if large, fast rise-time load transients are anticipated, or if

the device is not located near the power source. If source impedance is not sufficiently low, a 0.1-

μF input

capacitor may be necessary to ensure stability.

The TPS782 series is designed to be stable with standard ceramic capacitors with values of 1.0

μF or larger at

the output. X5R- and X7R-type capacitors are best because they have minimal variation in value and ESR over

temperature. Maximum ESR should be less than 1.0

Ω. With tolerance and dc bias effects, the minimum

capacitance to ensure stability is 1

μF.

12

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