TPS715xx
www.ti.com .................................................................................................................................................... SLVS338P–MAY 2001–REVISED NOVEMBER 2008
APPLICATION INFORMATION
The TPS715xx family of LDO regulators has been optimized for ultra-low power applications such as the
MSP430 microcontroller. Its ultra-low supply current maximizes efficiency at light loads, and its high input voltage
range makes it suitable for supplies such as unconditioned solar panels.
TPS71533
VIN
VOUT
IN
OUT
GND
C1
µ
0.47
F
µ
0.1
F
Figure 15. Typical Application Circuit (Fixed Voltage Version)
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 TPS715xx 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. X7R type capacitors are recommended, but X5R and others may be used.
Power Dissipation and Junction Temperature
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
within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD,
which must be less than or equal to PD(max)
.
The maximum-power-dissipation limit is determined using the following equation:
T max * T
J
+
A
P
D(max)
R
qJA
(1)
where:
•
•
•
TJmax is the maximum allowable junction temperature.
θJA is the thermal resistance junction-to-ambient for the package (see the Dissipation Ratings table).
TA is the ambient temperature.
R
The regulator dissipation is calculated using:
ǒ
Ǔ
PD + VIN*VOUT IOUT
(2)
For a higher power package version of the TPS715xx, see the TPS715Axx.
Regulator Protection
The TPS715xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input
voltage drops below the output voltage (e.g., during power-down). Current is conducted from the output to the
input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be
appropriate.
The TPS715xx features internal current limiting. During normal operation, the TPS715xx limits output current to
approximately 500 mA. When current limiting engages, the output voltage scales back linearly until the
overcurrent condition ends. Take care not to exceed the power dissipation ratings of the package.
Copyright © 2001–2008, Texas Instruments Incorporated
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