TPS7248QD

TPS7248QD Application Field and Working Principle

The TPS7248QD is a positive adjustable low-drop out (LDO) linear regulator which is derived from Texas Instruments. The regulator has an advanced voltage accuracy with an output voltage range of 0.85 V to 5.25 V that is set by two external resistors. This device features excellent line and load regulation, wide bandwidth, and fast transient response. It also has a wide temperature range of -40°C to 125°C.

Features and Benefits

• Low noise: Vnoise max = 30μVrms
• High current capability: 1.3A
• Low dropout voltage: 240mV @ 1.3A
• Excellent transient response
• Wide temperature range
• High PSRR: 60dB @ 1.3A
• Output voltage range: 0.85 V to 5.25 V
• Output current of 1.3 A
• Integrated protection circuitry

Applications

• Portable devices
• Notebook computers
• Wireless LANs
• GPSs
• Digital cameras
• Bluetooth devices
• MP3 players
• High-end audio systems

Working Principle

The TPS7248QD utilizes an advanced current-mode control architecture to regulate the output voltage. The device has a built-in reference voltage of 2.5V, which is used as a reference for the output voltage. The feedback voltage is set by two external resistors, meanwhile, the regulator compares the feedback voltage with the reference voltage. The error amplifier uses this comparison to adjust the gate voltage of the pass transistor, thus regulating the output voltage. The parameter of the switching frequency is set by an external capacitor.

The TPS7248QD also has built-in protection circuitry to prevent damage from over-current and over-temperature. The ET/U-pin (over temperature pin) can be used to detect the temperature of the device and signal the external system when it goes above the over-temperature threshold. The device also includes a current limiter circuit to prevent damage from excessive overload.

Overall, the TPS7248QD is an excellent choice for applications that require a high-performance, efficient, and low-noise voltage regulator. It has advanced features such as wide bandwidth, excellent line and load regulation, low dropout voltage, and integrated protection circuitry. It is also cost-effective due to its low- impedance layout, wide temperature range, and long-term stability.