TPS75825KTTRG3

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TPS75825KTTRG3 Application Field and Working Principle

Linear voltage regulators are used in a variety of electronic systems to control the output voltage by converting an input voltage to the desired voltage. The TPS75825KTTRG3 is a three-terminal positive adjustable linear regulator from Texas Instruments. It is a low-input voltage, low-drop-out linear regulator with an integrated low-side MOSFET to quickly provide a regulated positive output voltage of up to 1.2V from a 4.2V to 18V input supply. This device features a wide adjustable output voltage and power savings.

Features and Benefits

• Wide adjustable output range of 0.65V to 1.2V
• Low quiescent current of 65 μA and standby current of 1 μA
• Uses an advanced BiCMOS process optimized to achieve high efficiency
• Low Input Voltage of 4.2V and High of 18V with 0.7V VIN Hysteresis
• Integrated current-limit and thermal protection
• High power supply rejection ratio (PSRR) of 77dB at 1kHz
• High efficiency of 92% at 5V out
• Load disconnect safety
• Wide range of operating temperature from -40°C to 125°C
• Packages Available: TSSOP-24, SOT-883-2

Typical Applications

• Personal Communications
• Cellular and Cordless Phone Batteries
• Digital Cameras
• Audio and Video Players

Functional Description

The TPS75825KTTRG3 is a low-input voltage, low-drop-out linear voltage regulator with an integrated low-side MOSFET. The regulator is designed to supply a regulated 1.2V output voltage. It utilizes an advanced BiCMOS process with very low quiescent current and very small output voltage noise.

The device operates over a wide input voltage supply range of 4.2V to 18V. It provides high power supply rejection and is ideal for powering loads with low input voltage. The TPS75825KTTRG3 has low quiescent current of 65 μA and standby current of 1 μA.

The output pin features internal current limit and thermal protection for the device. A soft-start ramp limits the inrush current when the supply voltage is connected. The device is protected from any output overload conditions. To protect it from any output short-circuit conditions, the device has inherent current limit. The device also features a wide operating temperature range from -40°C to 125°C.

Working Principle

The TPS75825KTTRG3 input voltage is applied to the output voltage VOUT. A program voltage VADJ is then generated which is compared to the output voltage VOUT. If the output voltage is greater than the program voltage, a signal is sent to the P-Channel MOSFET which is connected to the input voltage. This signals the MOSFET to reduce the current flowing through the MOSFET thereby regulating the output voltage to the desired level.

In addition to the output voltage regulation, the TPS75825KTTRG3 also features a power saving mode (PSM). This mode enables the device to decrease the quiescent current when the load current is low. The power saving mode can be enabled by controlling the enable pins.

Conclusion

The TPS75825KTTRG3 is a three-terminal, adjustable linear regulator from Texas Instruments which uses an advanced BiCMOS process. It has a wide input voltage of 4.2V to 18V and can provide a regulated output voltage of up to 1.2V. It features a low quiescent current, high PSRR and high efficiency of 92%. It is ideal for small size personal communications, cellular and cordless phone batteries and digital cameras. It is available in a TSSOP-24 and SOT-883-2 package.

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