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APPLICATION INFORMATION

C1

0.1

µF

OUT

4

3

IN

NC

GND

2

5

0.47

µF

1

NC/FB

External Capacitor Requirements

Power Dissipation and Junction Temperature

P

D(max) +

T

J

max * TA

R

q

JA

(1)

P

D +

V

I *

V

O

I

O

(2)

TPS71501-Q1

TPS71525-Q1, TPS71530-Q1

TPS71533-Q1, TPS71550-Q1

SGLS272C – OCTOBER 2004 – REVISED APRIL 2007

The TPS715xx family of LDO regulators has been optimized for ultra-low power applications such as the

MSP430 microcontroller. Its ultralow supply current maximizes efficiency at light loads and its high input voltage

range makes it suitable for supplies such as unconditioned solar panels.

Figure 15. Typical Application Circuit (Fixed Voltage Version)

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 TPS715xx requires an output capacitor connected between OUT and GND to stabilize the internal control

loop. Any capacitor (including ceramic and tantalum)

≥0.47 µF properly stabilizes this loop.

To ensure reliable operation, worst-case junction temperature should not exceed 125

°C. This restriction limits

the power dissipation the regulator can handle in any given application. To ensure the junction temperature is

The maximum-power-dissipation limit is determined using the following equation:

where:

The regulator dissipation is calculated using:

Power dissipation resulting from quiescent current is negligible.

7

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