Overview
The TPA301DGNRG4 is a 350-mW mono audio power amplifier developed by Texas Instruments, specifically designed for low-voltage applications where internal speakers are required. This bridge-tied load (BTL) amplifier is optimized for narrow band applications such as cellular communications and is characterized for operation up to 20 kHz. It features a shutdown mode for power-sensitive applications, reducing the quiescent current to 0.15 µA. The device is available in an 8-pin MSOP PowerPAD package, which reduces board space and height significantly.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.5 | - | 5.5 | V |
| Output Power (RL = 8 Ω, VDD = 5 V) | - | - | 350 | mW |
| Output Power (RL = 8 Ω, VDD = 3.3 V) | - | - | 250 | mW |
| Quiescent Current in Shutdown Mode | - | - | 0.15 | µA |
| Operating Free-Air Temperature Range | -40 | - | 85 | °C |
| Power Supply Rejection Ratio (PSRR) | - | - | 78 | dB |
| Total Harmonic Distortion + Noise (THD+N) | - | - | 1% | - |
Key Features
- Fully specified for 3.3-V and 5-V operation with a wide power supply compatibility range of 2.5 V to 5.5 V.
- Ultra-low quiescent current in shutdown mode of 0.15 µA.
- Thermal and short-circuit protection.
- Surface-mount packaging options including SOIC and PowerPAD MSOP, reducing board space and height.
- No need for external coupling capacitors on the output in most applications due to BTL configuration.
- High supply ripple rejection ratio of 78 dB.
- Low noise output voltage of 15 µV(rms).
Applications
The TPA301DGNRG4 is particularly suited for low-voltage audio applications, such as:
- Cellular communications devices.
- Portable audio equipment.
- Handheld devices requiring internal speakers.
- Battery-powered audio systems where power efficiency is crucial.
Q & A
- What is the maximum output power of the TPA301DGNRG4 at 5 V supply voltage?
The maximum output power is 350 mW into an 8-Ω load at 5 V supply voltage.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is 0.15 µA.
- What is the operating free-air temperature range of the TPA301DGNRG4?
The operating free-air temperature range is from -40°C to 85°C.
- Does the TPA301DGNRG4 require external coupling capacitors on the output?
No, the BTL configuration typically eliminates the need for external coupling capacitors on the output.
- What is the power supply rejection ratio (PSRR) of the TPA301DGNRG4?
The PSRR is 78 dB.
- What are the packaging options for the TPA301DGNRG4?
The device is available in 8-pin SOIC and PowerPAD MSOP packages.
- How does the TPA301DGNRG4 handle thermal and short-circuit protection?
The device features built-in thermal and short-circuit protection.
- What is the typical noise output voltage of the TPA301DGNRG4?
The typical noise output voltage is 15 µV(rms).
- What are some common applications for the TPA301DGNRG4?
Common applications include cellular communications devices, portable audio equipment, and handheld devices requiring internal speakers.
- How does the supply voltage affect the output power of the TPA301DGNRG4?
The output power is reduced at lower supply voltages; for example, it delivers 250 mW at 3.3 V supply voltage into an 8-Ω load.
