TPS7A8500ARGRR

TPS7A8500ARGRR

Part Number: TPS7A8500ARGRR

Manufacturer: Texas Instruments

Description: IC REG LINEAR POS ADJ 4A 20VQFN

Shipped from: Shenzhen/HK Warehouse

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TPS7A8500ARGRR Description

To source 4 A with only 240 mV of maximum dropout, the TPS7A85A is a low-noise (4.4 VRMS) low dropout linear regulator (LDO). The device has an external resistor divider that allows the output voltage to be adjusted from 0.8 V to 5.1 V, in addition to the pin-programmable range of 0.8 V to 3.95 V. Because of its high PSRR, low noise (4.4 VRMS), and high output current capabilities. The TPS7A85A is well-suited for noise-sensitive applications involving high-speed communications, video, medicine, testing, and measurement.

The TPS7A85A is well suited for driving high-performance SerDes, ADCs, DACs, and RF components due to its ability to control power-supply-produced phase noise and clock jitter without sacrificing performance. The device’s excellent performance and 5.1-V output capacity are particularly useful in RF amplifiers.

The TPS7A85A’s remote sensing, superb transient performance, soft-start capabilities, and high precision (0.75% overload and temperature) guarantee peak system performance for digital loads (including ASICs, FPGAs, and DSPs) that require low-input, low-output voltage operation. The TPS7A8500A’s adaptability makes it a go-to component for various high-stakes uses.

TPS7A8500ARGRR Features

  • 150 mV (typical) of low dropout at 4 A.
  • Accuracy with BIAS of 0.75% (maximum) over the line, load, and temperature.
  • fantastic load transient response
  • Flexibility in the Soft-Start In-Rush Control.
  • PG (Open Drain) Power Output
  • With a 47-F or Greater Ceramic Output Capacitor, stable.

Detailed Description

Having high precision (0.75%), low noise (4.4 VRMS), low dropout, and high current (up to 4 A), the TPS7A85A is a low-dropout linear voltage regulator (LDO). These characteristics make the equipment a dependable tool for resolving many intricate problems relating to creating a clean and precise power supply. The TPS7A85A can be used successfully in various contexts since it has several properties.

Feature Voltage

Regulation Features

DC Regulation

The only distinction between an LDO and a class-B amplifier in terms of functionality is that an LDO’s input signal is the device’s very own internal reference voltage (VREF). This leads to the conclusion that the reference can be viewed as an input for an impurity-free dc signal. The device’s combination of the output capacitor and the pass element results in the distinctively low output impedance of an LDO. When used as a current source, the pass element has a high input impedance that must be supplied to the source voltage.

A positive LDO can only be a current source because of how the class-B architecture is built. One of the most precise voltage regulators available, this device can achieve an output voltage accuracy of up to 0.75% thanks to the high-precision bandgap voltage (VBG) that generates VREF. The low dropout voltage, also known as VDO, contributes to an increase in the overall system efficiency by lowering the amount of thermal power dissipation required of the device to regulate the output voltage at a given current level. To do this, the device’s power loss as the heat must be reduced. This device is close to a perfect voltage source because it has all of these things in the right amounts.

AC and Transient Response

The LDO responds relatively quickly to a transient, commonly known as a large-signal response, due to its high input and low output impedance throughout the frequency. The output current, also known as a load transient, or the input supply, also known as a line transient, can both experience this. The LDO can approximate an ideal power supply in both ac (small-signal) and large-signal situations thanks to this capability, which also shows that the LDO has a high power-supply rejection ratio (PSRR) and a low internal noise-floor (Vn).

Carefully choosing the values of the external components results in the best small- and large-signal responses. The NR/SS capacitor and the feed-forward capacitor help to reduce the device’s noise floor and enhance the PSRR (CFF).

System Start-Up Features

In many applications, the power supply output must be turned on within a certain timeframe to either assure load function or minimize input supply load, as well as meet other sequencing criteria. The start-up of the LDO can be well controlled and adjusted by the user, providing a straightforward solution to the complex problems that many power-supply design engineers are required to solve.

Undervoltage Lockout (UVLO) Control

The UVLO circuits react rapidly to glitches on the IN or BIAS rails and try to shut the device’s output if any of these rails collapse.

Active Discharge

The gadget discharges the output capacitance whenever EN or UVLO is in a low condition. To achieve this, a resistor with a few hundred ohms of resistance is connected between VOUT and GND. It is not advisable to rely on the active discharge circuit to discharge sizable output capacitors when the input voltage drops below the necessary output voltage. Use a different approach in its place. Current flows reversely, from the output to the input, when VOUT exceeds VIN. Reverse current, which is happening here, can damage the equipment (when VOUT is greater than VIN plus 0.3 V).

Power-Good Output (PG)

Because it indicates when the output is approaching close to its nominal value, the PG signal provides a straightforward method for satisfying tight sequencing constraints. This is because it signals when the output gets close to its nominal value. PG can signal other devices within a system when the value specified for the output voltage (VOUT(nom)) is either approaching, at, or exceeding the value defined for the output voltage.

The PG signal is an open-drain digital output, which means it must be connected to a voltage source using a pullup resistor and has an active high state. Additionally, the signal has a high state while it is in its active position. The PG circuit produces high impedance at the PG pin. This demonstrates that the power supply is operating as it should be. When a large feed-forward capacitor is utilized, the output voltage is reduced in frequency and slowed down in magnitude. In addition, Since the PG circuit monitors the FB pin, The perception of a false positive may be caused by the PG signal.  A basic approach to solving this problem is to use an external voltage detector device like the TPS3890, for example.

Conclusion

The TPS7A85A component is built to function properly from an input voltage supply that falls between 1.1 V to 6.5 V. If the input supply is lower than 1.4 volts, then you will need to utilize a biasing rail that is at least 3 volts. The device’s ability to have regulated output is made possible by the wide range of voltage that it accepts as input. The supply of this input needs to be carefully monitored. If the noise level of the input supply is high, adding more input capacitors with a low equivalent series resistance (ESR) could help enhance output noise performance.

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