Datasheet
Table Of Contents
- FEATURES
- CONTENTS
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DISSIPATION RATINGS
- RECOMMENDED OPERATING CONDITIONS
- ELECTROSTATIC DISCHARGE (ESD) PROTECTION
- ELECTRICAL CHARACTERISTICS
- TYPICAL CHARACTERISTICS
- DEVICE INFORMATION
- APPLICATION INFORMATION
- DESIGN EXAMPLES
- ADDITIONAL REFERENCES
- Revision History
TPS40303, TPS40304, TPS40305
www.ti.com
SLUS964A –NOVEMBER 2009–REVISED AUGUST 2012
Power Good
The TPS4030x provides an indication that output is good for the converter. This is an open drain signal and pulls
low when any condition exists that would indicate that the output of the supply might be out of regulation. These
conditions include the following:
• V
FB
is more than ±12.5% from nominal
• Soft-start is active
• A short circuit condition has been detected
NOTE
When there is no power to the device, PGOOD is not able to pull close to GND if an
auxiliary supply is used for the power good indication. In this case, a built in resistor
connected from drain to gate on the PGOOD pull down device makes the PGOOD pin
look approximately like a diode to GND.
Thermal Shutdown
If the junction temperature of the device reaches the thermal shutdown limit of 145°C, the PWM and the oscillator
are turned off and HDRV and LDRV are driven low. When the junction cools to the required level (125°C typical),
the PWM initiates soft start as during a normal power-up cycle.
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Product Folder Links :TPS40303 TPS40304 TPS40305