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TPS76601 Datasheet(PDF) 16 Page - Texas Instruments

Part No. TPS76601
Description  ULTRALOW QUIESCENT CURRENT 250-mA LOW DROPOUT VOLTAGE REGULATORS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS76601 Datasheet(HTML) 16 Page - Texas Instruments

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POWER-GOOD INDICATOR
REGULATOR PROTECTION
POWER DISSIPATION AND JUNCTION TEMPERATURE
(3)
(4)
TPS76615
,, TPS76618,, TPS76625
TPS76627, TPS76628, TPS76630
TPS76633, TPS76650, TPS76601
SLVS237C – AUGUST 1999 – REVISED JANUARY 2009................................................................................................................................................. www.ti.com
The TPS766xx features a power-good (PG) output that can be used to monitor the status of the regulator. The
internal comparator monitors the output voltage: when the output drops to between 92% and 98% of its nominal
regulated value, the PG output transistor turns on, taking the signal low. The open-drain output requires a pullup
resistor. If not used, it can be left floating. PG can be used to drive power-on reset circuitry or used as a
low-battery indicator.
The TPS766xx PMOS-pass transistor has a built-in back diode that conducts reverse currents when the input
voltage drops below the output voltage (for example, during power down). Current is conducted from the output
to the input and is not internally limited. When extended reverse voltage is anticipated, external limiting may be
appropriate.
The TPS766xx also features internal current limiting and thermal protection. During normal operation, the
TPS766xx limits output current to approximately 0.8 A (typ). 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. If the
temperature of the device exceeds +150°C (typ), thermal-protection circuitry shuts it down. Once the device has
cooled below +130°C (typ), regulator operation resumes.
Specified regulator operation is assured to a junction temperature of +125°C; the maximum junction temperature
should be restricted to +125°C under normal operating conditions. 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:
Where:
• T
Jmax is the maximum allowable junction temperature;
• Rθ
JA is the thermal resistance junction-to-ambient for the package (that is, 176°C/W for the 8-terminal SOIC);
and
• T
A is the ambient temperature.
The regulator dissipation is calculated using:
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal
protection circuit.
16
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Copyright © 1999–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS76615 TPS76618 TPS76625 TPS76627 TPS76628 TPS76630 TPS76633 TPS76650
TPS76601


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