Datasheet

 
 
SLVS325C − MARCH 2001 − REVISED MAY 2002
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12
OUTPUT VOLTAGE
PROGRAMMING GUIDE
V
O
V
I
OUT
FB
R1
R2
GND
EN
IN
TPS79101
1 µF
BYPASS
0.01 µF
1 µF
C1
22 pF
15 pF
15 pF
OUTPUT
VOLTAGE
R1 R2
2.5 V
3.3 V
3.6 V
C1
31.6 kΩ
51 kΩ
59 kΩ
30.1 kΩ
30.1 kΩ
30.1 kΩ
≤ 0.7 V
≥ 2 V
Figure 33. TPS79101 Adjustable LDO Regulator Programming
REGULATOR PROTECTION
The TPS791xx 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 TPS791xx features internal current limiting and thermal protection. During normal operation, the TPS791xx
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.