TPS715A33

IN

OUT

V

IN

V

OUT

C1

0.1 mF

0.47 mF

GND

10

TPS715A

SBVS047H – MAY 2004 – REVISED MARCH 2016

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Copyright © 2004–2016, Texas Instruments Incorporated

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 TPS715A family of LDO regulators is optimized for ultralow-power applications such as the MSP430

microcontroller. The ultralow-supply current of the TPS715A device maximizes efficiency at light loads, and its

high input voltage range makes the device suitable for supplies such as unconditioned solar panels.

8.2 Typical Applications

8.2.1 Typical Application (Fixed-Voltage Version)

Figure 16. Typical Application Circuit (Fixed-Voltage Version)

8.2.1.1 Design Requirements

8.2.1.1.1

Power the MSP430 Microcontroller

Several versions of the TPS715A are ideal for powering the MSP430 microcontroller. Table 2 shows potential

applications of some voltage versions.

Table 2. Typical MSP430 Applications

DEVICE

APPLICATION

TPS715A19

1.9 V

TPS715A23

2.3 V

TPS715A30

3 V

TPS715A345

3.45 V

The TPS715A family of devices offers many output voltage versions to allow the supply voltage to be optimized

for the MSP430, thereby minimizing the supply current consumed by the MSP430.

8.2.1.2 Detailed Design Procedure

8.2.1.2.1

External Capacitor Requirements

Although not required, a 0.047-

μF or larger input bypass capacitor, connected between IN and GND and located

close to the device, is recommended to improve transient response and noise rejection of the power supply as a

whole. A higher-value input capacitor may be necessary if large, fast-rise-time load transients are anticipated and

the device is located several inches from the power source.

The TPS715A device requires an output capacitor connected between OUT and GND to stabilize the internal

control loop. Any capacitor (including ceramic and tantalum) greater than or equal to 0.47

μF properly stabilizes

this loop. The X7R- or X5R-type capacitors are recommended because these capacitors have a wider

temperature specification and lower temperature coefficient, but other types of capacitors can be used.