Overview
The TPS74401RGRR, produced by Texas Instruments, is a 3.0-A ultra-low-dropout (LDO) linear regulator with programmable soft-start. This device is designed to provide robust power management for a wide variety of applications, including those requiring precise voltage regulation and sequencing. The TPS74401 offers high accuracy, low dropout voltage, and adjustable start-up in-rush control, making it ideal for powering processors, field-programmable gate arrays (FPGAs), digital signal processors (DSPs), and other integrated circuits (ICs) with specific start-up requirements.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 1.1 | - | 5.5 | V |
| Output Voltage Range | 0.8 | - | 3.6 | V |
| Output Current | - | - | 3.0 | A |
| Dropout Voltage (Typical) | - | 115mV (legacy), 120mV (new) | - | mV |
| Voltage Accuracy | - | 1% | - | % |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Options | - | 5mm × 5mm × 1mm VQFN (RGW), 3.5mm × 3.5mm VQFN (RGR), DDPAK-7 (KTW) | - | - |
Key Features
- Adjustable start-up in-rush control to minimize stress on the input power source.
- User-programmable soft-start with a monotonic ramp, suitable for various processors and ICs.
- Ultra-low dropout voltage: 115mV (typical) for legacy chips and 120mV (typical) for new chips at 3.0A.
- Stable operation without an output capacitor (legacy chip) or with any capacitor ≥ 2.2µF (new chip).
- Power-good (PG) output for supply monitoring or sequencing signals.
- Precision reference and error amplifier delivering 1% accuracy over line, load, and temperature.
- VBIAS permits low VIN operation with good transient response.
Applications
- Network attached storage - enterprise.
- Rack servers.
- Network interface cards (NIC).
- Merchant network and server power supplies.
- FPGA applications.
- DSP core and I/O voltages.
- Post-regulation applications.
- Applications with special start-up time or sequencing requirements.
- Hot-swap and inrush controls.
Q & A
- What is the input voltage range of the TPS74401RGRR?
The input voltage range is from 1.1V to 5.5V.
- What is the maximum output current of the TPS74401RGRR?
The maximum output current is 3.0A.
- What is the typical dropout voltage of the TPS74401RGRR?
The typical dropout voltage is 115mV for legacy chips and 120mV for new chips at 3.0A.
- Does the TPS74401RGRR require an output capacitor for stability?
No, the device is stable without an output capacitor (legacy chip) or with any capacitor ≥ 2.2µF (new chip).
- What is the purpose of the power-good (PG) output?
The power-good output allows supply monitoring or provides a sequencing signal for other supplies.
- What are the available package options for the TPS74401RGRR?
The available packages are 5mm × 5mm × 1mm VQFN (RGW), 3.5mm × 3.5mm VQFN (RGR), and DDPAK-7 (KTW).
- What is the operating temperature range of the TPS74401RGRR?
The operating temperature range is from -40°C to 125°C.
- How does the adjustable soft-start feature work?
The soft-start is user-programmable using a capacitor connected to the SS pin, allowing for a monotonic ramp to minimize inrush current.
- What is the accuracy of the output voltage over line, load, and temperature?
The output voltage accuracy is 1% over line, load, and temperature.
- Can the TPS74401RGRR be used in safety-critical applications?
It is important to refer to the datasheet and relevant documentation for any disclaimers and guidelines regarding use in safety-critical applications.
