Part Number: TPS7A8400ARGRR

Manufacturer: Texas Instruments

Description: Linear Voltage Regulator IC Positive Adjustable/Programmable 1 Output

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TPS7A8400ARGRR Description

The TPS7A84A is a low-noise, low-dropout linear regulator (LDO) with a maximum dropout of only 180 mV and the capacity to source 3 A of current. For this device, there are two alternative output voltage ranges available. The pin-programming range for the TPS7A8400A’s output voltage is 0.8 V to 3.95 V with a resolution of 50 mV. An external resistor divider can also change the output voltage from 0.8 V to 5.15 V. The pin-programming range for the TPS7A8401A’s output voltage is 0.5 V to 2.075 V with a resolution of 25 mV. An external resistor divider can also change the output voltage from 0.5 V to 5.15 V.

Due to its low noise level, high power supply rejection ratio (PSRR), and high output current capabilities, the TPS7A84A is ideally suited to power noise-sensitive components used in high-speed communications, video, medical, test, and measurement applications. The TPS7A84A’s low phase noise and clock jitter make it ideal for powering high-performance SerDes, ADCs, DACs, and RF components. The device’s strong performance and output capabilities, which is larger than 5 V, can significantly benefit RF amplifiers. For digital loads [such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and digital signal processors (DSPs), the TPS7A84A ensures optimal system performance due to its exceptional accuracy (0.75 percent over the line, load, and temperature), remote sensing, excellent transient performance, and soft-start capabilities. Due to its adaptability, the TPS7A84A is an ideal component for many demanding applications.

TPS7A8400ARGRR Features

  • Low dropout: BIAS at 3 A, 180 mV (maximum) 0.75% (maximum) accuracy over line, load, and temperature using BIAS Low churn:
  • Noise in the output voltage: 4.4 VRMS

Detailed Description

With high precision (0.75%), low noise (4.4 VRMS), low dropout, and high current (3 A), the TPS7A84A 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 TPS7A84A can be successfully used in various scenarios since it has several properties.

Features Description

Voltage Control Features

A DC regulation

An LDO serves the same function as a class-B amplifier, with the device’s internal reference voltage serving as the input signal (VREF).

VREF was designed to have a minimum bandwidth at the error amplifier’s input by incorporating a low-pass filter known as VNR/SS into its construction. As a result, the reference can be considered an entirely clean dc signal input. The characteristically low output impedance of an LDO is due to the interaction between the output capacitor and the pass element. The pass element exhibits a high input impedance to the source voltage when operating as a current source.

A positive LDO can only function as a source of current because of the way the class-B architecture is built. Thanks mainly to the high-precision band-gap voltage (VBG) that generates VREF, this device can achieve an output voltage accuracy of up to 0.75%. By reducing the amount of thermal power dissipation necessary for the device to regulate the output voltage at a specific current level, the low dropout voltage, also known as VDO, contributes to increasing the overall system efficiency. Due to the combination of these features, this device is a good approximation of an ideal voltage source.

● Alternating Current and Momentary Reaction

Because of its high input impedance and low output impedance throughout frequency, the LDO responds quickly to a transient on either the input supply, known as a line transient or the output current, known as a load brief.

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 feed-forward capacitor (CFF), which also contributes to improving PSRR, and the NR/SS capacitor (CNR/SS) make it simple to lower the device’s noise floor.

● Activities Offered During the Boot Process

In a wide range of applications, the power supply’s output must be turned on within a defined window of time to ensure that the load will function adequately or limit the load imposed on the input supply and satisfy other sequencing criteria. The user may easily manage and modify how the LDO starts up, offering a simple answer to the challenging issues that several power-supply design engineers must tackle.

● Programmable Start Softly (NR/SS)

Soft start allows for direct control of the output start-up time and indirect control of the output current during startup (inrush current).

● Internal Recursion

Given the high-power levels present in a PDN and the inherent variability of each power source, it might be difficult to exert control over when a single power supply switches on inside the PDN. The under-voltage lockout circuits (UVLO1, 2(IN), and UVLOBIAS), along with the enable circuit (EN), determine whether the LDO is on or off.

● Activate (EN) (EN)

The enable signal (VEN) is an active-high digital control that turns on the LDO when the boost voltage exceeds the increasing threshold. In contrast, when the enable voltage is lower than the dropping threshold, the enable signal (VEN) functions as a passive-low digital control that turns off the LDO. The precise enable threshold is between VIH(EN) and VIL because EN is a digital control (EN). Connect EN to VIN if you don’t want the enabling feature.

● Undervoltage Lockout (UVLO) System Control

When there are issues with the IN or BIAS rails, the UVLO circuits respond quickly and attempt to shut off the device’s output.

● Static Electric Charge

When either EN or UVLO is in its low state, the gadget discharges the output capacitance. To do this, join ground, VOUT, and a resistor in series with several hundred ohms. You shouldn’t rely on the active discharge circuit to discharge large output capacitors when the input voltage drops below the necessary output voltage. You should choose a different approach instead. When VOUT exceeds VIN, the current moves from the output to the input in the opposite way. When VOUT is more than VIN plus 0.3 V, this is referred to as reverse current, and it may be damaging to the device;

Internal safeguards and mitigation strategies Fault occurrences are possible in many applications and could destroy the system’s hardware. Short circuits and overheating are the two most common power supply problems. The TPS7A84A will activate protection circuitry during these occurrences to protect both the device and the load. Operating the device continually under these fault conditions or at a junction temperature higher than 125 degrees Celsius is not recommended since it reduces the device’s reliability over time.

● The Current Limit Should Be Retracted (ICL)

The internal current limit circuit’s task is to shield the LDO against faults that result in high load current or shorting incidents. The output voltage will drop with the load impedance because the LDO can source a steady current when a current-limit event happens. A thermal shutdown may be initiated during a current limit incident due to the significant power dissipation typically present in conditions like these. If possible, reduce the inductances linked to the input and load to ensure that the current restriction operates as intended. Continuous operation within the existing limit is not advised.


The TPS7A8400A can be programmed to function between 0.8 V and 3.95 V using the ANY-OUT network, whereas the TPS7A8401A can be programmed to operate between 0.5 V and 2.075 V. To obtain an output voltage range more than 2.075 V for the TPS7A8401A and 3.95 V for the TPS7A8400A and up to 5.15 V, extra resistors must be used. We shall refer to this specific TPS7A84A setup as the flexible configuration for the duration of this document.

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