UA7908CKCS

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UA7908CKCS Application Field and Working Principle

UA7908CKCS is an integrated linear voltage regulator, which belongs to PMIC (Power Management Integrated Circuits). It provides low noise and low drop-out voltage, suitable for various loads and operating conditions. The UA7908CKCS offers an excellent power supply feature set, including overcurrent and overtemperature protection, overvoltage protection, and low drop-out voltage.

Features of UA7908CKCS

• Output voltage adjustment range: 0.75V to 8.1V.
• Output voltage range is adjustable with external divider.
• Max output current: 800 mA.
• Low dropout voltage: 175 mV (typical).
• Low quiescent current: 25 μA (typical).
• Overvoltage protection.
• Overcurrent protection.
• Overtemperature protection.
• High PSRR: 70 dB (typical).

Operating Conditions

• Operating ambient temperature range: –40°C to 85°C.
• Operating input voltage range: 2.5V to 20V.
• Max operating frequency is 100 kHz.

Application Field

The UA7908CKCS is mainly used in applications requiring low output voltage, low noise, and high ripple rejection. It is suitable for processors, LCD monitors, digital cameras, PDAs, computer peripherals, mobile phones, CD players, and other portable products.

Working Principle

The UA7908CKCS is a low dropout regulator (LDO). It uses a precision, temperature-compensated reference, along with an internal error amplifier, comparator, and current source to stabilize the output voltage. The output voltage of the regulator is proportional to the difference between the reference voltage and the feedback voltage. The output voltage is adjusted by varying the feedback signal.

The UA7908CKCS also features several protection circuits to ensure safe operation. It includes an overvoltage protection circuit and an overcurrent protection circuit. The overvoltage protection circuit monitors the output voltage and shuts down the device if the voltage exceeds the maximum operating voltage. The overcurrent protection circuit monitors the output current and shuts down the device if the current exceeds the maximum operating current. This provides additional protection against overloading.

The UA7908CKCS also features an overtemperature protection circuit. This monitors the die temperature and shuts down the device if the temperature exceeds the maximum operating temperature. This provides additional protection against thermal runaway.

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