Overview
The REG101UA-5 is a low-dropout linear voltage regulator from Texas Instruments (formerly Burr-Brown), part of the REG101 family. This regulator is known for its high performance and low noise characteristics, making it suitable for a variety of applications. The REG101UA-5 features a new DMOS topology that provides significant improvements over traditional low-dropout regulators, including ultra-low dropout voltage and fast transient response.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Output Voltage | - | - | 5.0 | - | V |
| Input Voltage Range | VIN > 1.8V | - | - | 10 | V |
| Dropout Voltage | - | - | 60mV | - | mV |
| Ground Pin Current | IOUT = 100mA | - | 500 | 650 | µA |
| Enable Pin Current | VENABLE ≤ 0.5V | 0.01 | 0.2 | - | µA |
| Operating Temperature Range | - | -40 | - | 85 | °C |
| Package Type | - | - | - | SOIC (D) 8-pin | - |
Key Features
- Ultra Low Dropout Voltage: 60mV typical at 100mA load.
- No Output Capacitor Required for Stability: Unlike conventional low-dropout regulators, no minimum output capacitor is needed for stability.
- Fast Transient Response: Ensures quick recovery from load changes.
- Very Low Noise: Typically 23µVrms for VOUT = 3.3V with CNR = 0.01µF.
- High Accuracy: ±1.5% maximum over temperature, line, and load variations.
- High Efficiency: Ground pin current of 500µA at IOUT = 100mA and drops to 10nA when not enabled.
- Multiple Output Voltages Available: 2.5V, 2.8V, 2.85V, 3.0V, 3.3V, 5.0V, and adjustable versions.
- Foldback Current Limit and Thermal Protection: Protects the load from damage due to overcurrent and excessive temperature.
- Small Surface-Mount Packages: Available in SOT23-5 and SO-8 packages.
Applications
- Portable Communication Devices: Ideal for use in mobile phones, tablets, and other portable communication equipment.
- Battery-Powered Equipment: Suitable for devices that require efficient power management.
- Personal Digital Assistants: Used in PDAs and other handheld devices.
- Modems: Applicable in modem designs requiring stable and low-noise power supply.
- Bar-Code Scanners: Used in barcode scanners and other similar devices.
- Backup Power Supplies: Can be used in backup power systems requiring reliable voltage regulation.
Q & A
- What is the typical dropout voltage of the REG101UA-5?
The typical dropout voltage is 60mV at a 100mA load.
- Is an output capacitor required for stability?
No, the REG101UA-5 does not require an output capacitor for stability, although it can improve transient response.
- What is the ground pin current when the regulator is enabled and disabled?
The ground pin current is typically 500µA at IOUT = 100mA and drops to 10nA when not enabled.
- What are the available output voltage options for the REG101 family?
The available output voltages are 2.5V, 2.8V, 2.85V, 3.0V, 3.3V, 5.0V, and adjustable versions.
- What kind of protection does the REG101UA-5 offer?
The regulator features foldback current limit and thermal protection to prevent damage from overcurrent and excessive temperature.
- What are the typical applications of the REG101UA-5?
It is used in portable communication devices, battery-powered equipment, personal digital assistants, modems, bar-code scanners, and backup power supplies.
- What is the operating temperature range of the REG101UA-5?
The operating temperature range is -40°C to +85°C.
- What package types are available for the REG101UA-5?
The regulator is available in SOT23-5 and SO-8 surface-mount packages.
- How does the noise performance of the REG101UA-5 compare to other regulators?
The REG101UA-5 has very low output noise, typically 23µVrms for VOUT = 3.3V with CNR = 0.01µF.
- Can the output voltage of the adjustable version be customized?
