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MAX8880EUT-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX8880EUT-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page 12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POK 6 _______________________________________________________________________________________ Reverse Battery Protection The MAX8880/MAX8881 have a unique protection scheme that limits the reverse supply current to less than 1mA when VIN is forced below ground. The circuit monitors the polarity of IN, disconnecting the internal circuitry and parasitic diodes when the battery is reversed. This feature prevents the device from electri- cal stress and damage when the battery is connected backwards. If reverse battery protection is needed, drive SHDN through a 100k Ω resistor. Current Limiting The MAX8880/MAX8881 include a current limiter. When the output is shorted to ground, drive to the output PMOS is limited. The output can be shorted to ground without damage to the part. Thermal Overload Protection Thermal overload protection limits total power dissipa- tion in the MAX8880/MAX8881. When the internal junc- tion temperature exceeds TJ = +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sen- sor turns the pass transistor on again after the IC’s junction temperature cools by 15°C, resulting in a pulsed output during continuous thermal-overload con- ditions. Thermal-overload protection is designed to protect the MAX8880/MAX8881 in the event of fault conditions. For continuous operation, do not exceed the absolute maxi- mum junction temperature rating of TJ(MAX) = +150°C. Operating Region and Power Dissipation The MAX8880/MAX8881’s maximum power dissipation depends on the thermal resistance of the case and cir- cuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipation in the device is P = IOUT (VIN - VOUT). The maximum power dissipation allowed is: IN OUT FB GND C2 4.7 μF C1 1 μF SHDN 2.5V TO 12V UP TO 200mA R3 R4 REGULATION OK POK MAX8880 VIN VOUT 1.25V TO 5.5V Figure 3. Adjustable Output Using External Feedback Resistors SHUTDOWN LOGIC ERROR AMP 1.25V REF 91% REF P OUT POK GND IN SHDN MAX8881 THERMAL SENSOR REVERSE BATTERY PROTECTION MOS DRIVER WITH ILIMIT POK FB Figure 2. Functional Diagram |
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