TPS730xx
www.ti.com
SBVS054E – NOVEMBER 2004 – REVISED AUGUST 2005
APPLICATION INFORMATION (continued)
OUTPUT VOLTAGE
PROGRAMMING GUIDE
V
IN
1µF
IN
EN
NR
0.01µF
GND
FB
R2
OUT
TPS730xx
V
OUT
R1
C1
1
µ
F
OUTPUT
VOLTAGE
1.22 V
2.5 V
3.3 V
3.6 V
R1
short
R2
open
C1
0 pF
22 pF
15 pF
15 pF
31.6 k
Ω
30.1 k
Ω
51 k
Ω
30.1 k
Ω
59 k
Ω
30.1 k
Ω
Figure 17. TPS73001 Adjustable LDO Regulator Programming
Regulator Protection
The TPS730xx 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 TPS730xx features internal current limiting and thermal protection. During normal operation, the TPS730xx
limits output current to approximately 400 mA. When current limiting engages, the output voltage scales back
linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure,
care should be taken not to exceed the power dissipation ratings of the package or the absolute maximum
voltage ratings of the device. If the temperature of the device exceeds approximately 165°C, thermal-protection
circuitry shuts it down. Once the device has cooled down to below approximately 140°C, regulator operation
resumes.
9
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