TPS70933

EN

IN

OUT

V

IN

V

OUT

1

F

m

2.2

F

m

GND

NC

TPS709

www.ti.com

SBVS186G – MARCH 2012 – REVISED NOVEMBER 2015

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 TPS709 is a series of devices that belong to a new family of next-generation voltage regulators. These

devices consume low quiescent current and deliver excellent line and load transient performance. This

devices ideal for RF portable applications, current limit, and thermal protection. The TPS709 is specified from

–40°C to +125°C.

8.1.1 Input and Output Capacitor

The TPS709 devices are stable with output capacitors with an effective capacitance of 2.0

μF or greater for

output voltages below 1.5 V. For output voltages equal or greater than 1.5 V, the minimum effective capacitance

for stability is 1.5 µF. The maximum capacitance for stability is 47 µF. The equivalent series resistance (ESR) of

the output capacitor must be between 0

Ω and 0.2 Ω for stability.

The effective capacitance is the minimum capacitance value of a capacitor after taking into account variations

resulting from tolerances, temperature, and dc bias effects. X5R- and X7R-type ceramic capacitors are

recommended because these capacitors have minimal variation in value and ESR over temperature.

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

2.2-µF capacitor from IN to GND. This capacitor counteracts reactive input sources and improves transient

response, input ripple, and PSRR. An input capacitor is necessary if line transients greater than 10 V in

magnitude are anticipated.

8.1.2 Transient Response

As with any regulator, increasing the output capacitor size reduces over- and undershoot magnitude, but

increases transient response duration.

8.2 Typical Application

8.2.1 Design Requirements

Table 1 summarizes the design requirements for Figure 36.

PARAMETER

DESIGN SPECIFICATION

5 V to 20 V

3.3 V

< 5 µA

150 mA

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