Overview
The REG103GA-AG4, produced by Texas Instruments, is a low-noise, low-dropout linear regulator that features a new DMOS topology. This regulator is part of the REG103 family, which includes fixed output versions and an adjustable output version. It is designed to provide significant improvements over previous designs, including ultra-low dropout voltage, fast transient response, and low ground pin current. The REG103GA-AG4 is ideal for use in portable communications equipment and other applications requiring high output voltage accuracy and low noise.
Key Specifications
| Parameter | Condition | Min | Max | Units | |
|---|---|---|---|---|---|
| Supply Input Voltage, VIN | -0.3V | 16V | V | ||
| Enable Input Voltage, VEN | -0.3V | VIN | V | ||
| Output Voltage Range (REG103GA) | 3.0 | 3.0 | 3.0 | V | |
| Dropout Voltage | IOUT = 500mA | 115mV | mV | ||
| Ground Pin Current | IOUT = 500mA | 1mA | mA | ||
| Ground Pin Current (Not Enabled) | 0.5µA | µA | |||
| Output Noise Voltage | VOUT = 3.3V, CNR = 0.01µF | 33µVrms | µVrms | ||
| Operating Temperature Range | -55°C | 125°C | °C | ||
| Storage Temperature Range | -65°C | 150°C | °C | ||
| ESD Rating (HBM, VOUT to GND) | 1.5kV | V | |||
| ESD Rating (HBM, All other pins) | 2kV | V |
Key Features
- Ultra-Low Dropout Voltage: Typically 115mV at 500mA and 3.3V output.
- No Output Capacitor Required: Stability is maintained without the need for an output capacitor.
- Fast Transient Response: Excellent line and load transient performance.
- Low Ground Pin Current: Only 1mA at full load and drops to 0.5µA in not-enabled mode.
- Low Output Noise: Typically 33µVrms for VOUT = 3.3V with CNR = 0.01µF.
- High Output Voltage Accuracy: Maintained over temperature, line, and load variations.
- Internal Current Limit and Thermal Protection: Protects the regulator from damage due to excessive current or temperature.
- Error Flag (SO-8 Package): Provides a power good flag indicating the regulator is in regulation.
Applications
- Portable Communications Equipment: Ideal due to its low noise and high output voltage accuracy.
- Low-Power Systems: Suitable for systems requiring low dropout voltage and low ground pin current.
- Embedded Systems: Can be used in various embedded systems requiring stable and low-noise power supply.
- Aerospace and Defense: Applicable in critical systems where high reliability and stability are essential.
Q & A
- What is the typical dropout voltage of the REG103GA-AG4?
The typical dropout voltage is 115mV at 500mA and 3.3V output.
- Is an output capacitor required for stability?
No, the REG103GA-AG4 does not require an output capacitor for stability.
- What is the ground pin current at full load?
The ground pin current is typically 1mA at full load.
- What is the output noise voltage of the REG103GA-AG4?
The output noise voltage is typically 33µVrms for VOUT = 3.3V with CNR = 0.01µF.
- Does the REG103GA-AG4 have thermal protection?
Yes, it has thermal shutdown circuitry that protects the regulator from damage due to excessive temperature.
- What is the operating temperature range of the REG103GA-AG4?
The operating temperature range is -55°C to 125°C.
- Is there an error flag feature available?
Yes, the SO-8 package version includes an error flag pin that indicates when the regulator is out of regulation.
- How does the internal current limit protect the regulator?
The internal current limit has a typical value of 700mA and includes a fold-back feature to limit short-circuit current to 40mA, protecting the regulator from damage.
- What are the package options available for the REG103GA-AG4?
The REG103GA-AG4 is available in SO-8, DDPAK, and SOT223-5 packages.
- How does the REG103GA-AG4 handle transient line and load conditions?
The REG103GA-AG4 has excellent transient response to line and load conditions, which can be further improved with the addition of specific capacitors.
