TPS73701DRVR IC

Technical Specifications of TPS73701DRVR

Datasheet	TPS73701DRVR datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Voltage Regulators – Linear
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Regulator Topology	Positive Adjustable
Voltage – Output	1.2 V ~ 5.5 V
Current – Output	1A
Voltage – Dropout (Typical)	0.13V @ 1A
Number of Regulators	1
Voltage – Input	2.2 V ~ 5.5 V
Current – Limit (Min)	1.05A
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	6-WDFN Exposed Pad
Supplier Device Package	6-SON (2×2)

TPS73701DRVR Description

The TPS737xx series of LDO voltage regulators utilize an NMOS pass element arranged in a voltage-follower configuration. This design is not particularly affected by changes in output capacitor value or ESR, enabling it to function with a wide range of load configurations. The regulators demonstrate excellent load transient response, even when a small 1-μF ceramic output capacitor is utilized. Additionally, the NMOS topology permits very low dropout. The TPS737xx family delivers high precision with minimal dropout voltages and ground pin current using an advanced BiCMOS process. These regulators consume less than 20 nA of current when not enabled, making them ideal for portable applications. Thermal shutdown and foldback current limit features protect these devices from damage.

TPS73701DRVR Features

• Stable With Ceramic Output Capacitor of 1 F or Greater.
• Range of Input Voltage: 2.2 V to 5.5 V.
• 130 mV is the typical ultralow dropout voltage at 1 A.
• Even with a single 1-F output capacitor, the response to load transients is excellent.
• NMOS Topology Delivers Low Reverse Leakage Current.
• Initial Accuracy of 1%.
• Over line, load, and temperature, there is a 3% overall accuracy.
• Typical IQ in shutdown mode is less than 20 nA.
• Current Limit and Thermal Shutdown for Fault Protection.

TPS73701DRVR Detailed Description

To provide ultralow dropout performance, reverse current blockage, and freedom from output capacitor limitations, the TPS737xx belongs to a family of new-generation LDO regulators that use an NMOS pass transistor. Thanks to these capabilities and an enabled input, the TPS737xx is best suited for portable applications. Numerous fixed-output voltage and one adjustable-output version are available in this family of regulators. Thermal and overcurrent protection and foldback current limit is present in all versions.

TPS73701DRVR Feature Description

The NR pin is unavailable in the TPS73701 adjustable version. However, reducing output noise and enhancing load transient performance can be achieved by connecting a feedback capacitor (CFB) from the output to the feedback pin (FB). The maximum value for this capacitor should be 0.1 F. The TPS737xx’s internal charge pump generates an internal supply voltage high enough to drive the NMOS pass element’s gate above VOUT. At a frequency of about 4 MHz, the charge pump produces a switching noise of about 250 V; however, for most IOUT and COUT values, the contribution of charge-pump noise is insignificant at the regulator’s output.

Reverse Current

When the gate of the pass device is pulled low, the NMOS pass element of the TPS737xx automatically protects against the current flow from the regulator’s output to the input. The EN pin must be driven low before removing the input voltage to ensure all charge has been discharged from the pass element’s gate.

The pass element may remain on if the EN pin is not pulled low due to accumulated charge on the gate. No bias voltage is required on any pins for reverse current blocking after the EN pin has been driven low. When voltage is provided to the OUT pin, reverse current is defined as the current that flows out of the IN pin. The inbuilt 80-k resistor divider to ground causes more current to flow into the OUT pin.

Application Information

To achieve ultra-low dropout performance, avoid reverse current blockage, and be free of output capacitor restrictions, the TPS737xx family of LDO regulators uses an NMOS pass transistor. The TPS737xx is perfect for mobile applications thanks to these capabilities, low noise, and an enabled input. Numerous fixed-output voltage and one adjustable-output version are available in this family of regulators. Thermal and overcurrent protection and foldback current limit is present in all versions.

● Input and Output Capacitor Requirements

Although a very low input impedance does not necessitate using an input capacitor for stability, it is still advisable to connect a 0.1- to 1-F low equivalent series resistance (ESR) capacitor across the input supply close to the regulator. This capacitor enhances transient response, noise rejection, and ripple rejection by compensating for reactive input sources. If large, quick rise-time load transients are predicted or the device is several inches from the power supply, a higher-value capacitor might be required.

For stability, the TPS737xx needs a 1-F output capacitor. It is intended to be stable for all capacitor kinds and values currently on the market. The ringing may happen in applications with several low-ESR capacitors connected in parallel when the COUT and total ESR product falls below 50 nF. Total ESR is the sum of all parasitic resistances, including capacitor ESR, board, socket, and solder joint resistance. The combination of trace resistance and capacitor ESR typically satisfies this criterion.

● Transient Response

In a voltage follower design, the low open-loop output impedance afforded by the NMOS pass element enables operation without a 1-F output capacitor. Like with any regulator, the undershoot magnitude is decreased, but the duration is lengthened by adding more capacitance from the OUT pin to the ground. The transient responsiveness will also be improved in the adjustable version by connecting a capacitor, CFB, from the OUT pin to the FB pin.

When the output is overvoltage, the TPS737xx does not have active pulldown. Applications that link higher voltage sources, like alternative power supply, to the output are supported by this architecture. If a capacitor is attached to the output and the load current rapidly decreases to zero, this architecture also causes an output overshoot of several per cent. By including a load resistor, overshoot can be minimized in duration. The internal/external load resistance and output capacitor COUT influence how quickly the overshoot decays.

Power Supply Recommendations

The device’s intended operating voltage supply range is 2.2 V to 5.5 V. For the device to have a controlled output, there is enough headroom in the input voltage range. This input supply needs to be tightly controlled. Additional input capacitors with low ESR help to improve the output noise performance if the input supply is noisy.

Layout Guidelines

TI advises designing the printed circuit board (PCB) with distinct ground planes for VIN and VOUT, with each ground plane linked only at the GND pin of the device, to optimize AC performance, such as PSRR, output noise, and transient responsiveness. Additionally, the GND pin of the component should be directly connected to the ground connection for the bypass capacitor.

● Thermal Protection

When the junction temperature reaches roughly 160°C, thermal protection turns off the output, allowing the device to cool. The output circuitry is reactivated when the junction temperature drops to about 140°C. The thermal protection circuit may switch on and off based on power dissipation, thermal resistance, and ambient temperature. This cycling prevents the regulator from overheating-related harm by limiting the regulator’s energy dissipation. Any tendency for the thermal protection circuit to activate denotes an insufficient heatsink or high power dissipation. The junction temperature should be kept to a maximum of 125°C for reliable operation.

Until the thermal protection is activated, raising the ambient temperature, use the worst-case loads and signal conditions to estimate the margin of safety in the entire design (including the heatsink). For optimal dependability, thermal protection should activate at least 35°C above the highest ambient temperature that your application can tolerate. At the worst-case load and highest anticipated ambient temperature, this results in a worst-case junction temperature of 125°C. The internal protective circuitry of the TPS737xx is built to guard against overload situations. It wasn’t meant to be a substitute for adequate heatsinking. Device dependability is decreased by repeatedly putting the TPS737xx into thermal shutdown.

Conclusion

In conclusion, the TPS737xx series of LDO voltage regulators is a highly advanced family of regulators that utilizes an NMOS pass element in a voltage-follower configuration. As a result, these regulators offer exceptional load transient response and low dropout voltages. They are an ideal choice for portable applications with a quiescent current consumption of less than 20 nA. Additionally, these regulators offer thermal shutdown and foldback current limit protection to protect them from damage. They are also highly stable with a 1 F or greater ceramic output capacitor. Their reverse current blockage capabilities and freedom from output capacitor limitations make them a perfect choice for mobile applications. Therefore, if you’re looking for high precision, stability, and reliability in your power supply design, the TPS737xx family of regulators is an excellent choice.

Specifically, the TPS73701DRVR is highly reliable and effective for meeting your power management needs. Whether you’re looking to purchase a MOSFET or any other electronic component, ICRFQ offers a wide variety of parts, making it an excellent resource for all your electronics needs.

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