Overview
The LM4951ASD/NOPB is a high-quality audio power amplifier designed by Texas Instruments. It is part of the Boomer audio power amplifier series, known for providing high-quality output power with a minimal amount of external components. This amplifier is capable of delivering 1.8W continuous average power with less than 1% THD+N into a bridge-connected 8Ω load when operating from a 7.5VDC power supply. The LM4951A features a wide supply voltage range from 2.7V to 9V, making it versatile for various applications.
Key Specifications
| Parameter | Description | Typical Value | Limit |
|---|---|---|---|
| Supply Voltage Range | Operating voltage range | 2.7V to 9V | 2.7V to 9V |
| Quiescent Power Supply Current (VDD = 7.5V) | Current drawn when idle | 2.5mA | 4.5mA (max) |
| Power Output BTL at 7.5V, 1% THD | Output power in bridge-tied load configuration | 1.8W | - |
| Shutdown Current | Current in shutdown mode | 0.01µA | 5µA (max) |
| Fast Turn on Time | Time to turn on from shutdown | 25ms | - |
| Operating Temperature Range | Temperature range for operation | -40°C to 85°C | -40°C to 85°C |
Key Features
- Pop & Click Circuitry: Eliminates noise during turn-on and turn-off transitions.
- Wide Supply Voltage Range: Operates from 2.7V to 9V.
- Low Current, Active-Low Shutdown Mode: Low power consumption in shutdown mode.
- Low Quiescent Current: Minimal current draw when idle.
- Thermal Shutdown Protection: Protects against overheating.
- Short Circuit Protection: Protects against short circuits.
- Unity-Gain Stable: Stable operation without external components.
- External Gain Configuration Capability: Gain can be set using external resistors.
Applications
- Portable Devices: Suitable for handheld and portable electronic devices.
- Cell Phones: Ideal for mobile phone audio systems.
- Laptop Computers: Used in laptop computer speaker systems.
- Computer Speaker Systems: Suitable for desktop computer speakers.
- MP3 Player Speakers: Used in portable music players.
Q & A
- What is the supply voltage range of the LM4951ASD/NOPB?
The LM4951ASD/NOPB operates from a supply voltage range of 2.7V to 9V.
- How much power can the LM4951ASD/NOPB deliver?
The LM4951ASD/NOPB can deliver up to 1.8W continuous average power into a bridge-connected 8Ω load.
- What is the quiescent power supply current of the LM4951ASD/NOPB?
The quiescent power supply current is typically 2.5mA when VDD = 7.5V.
- Does the LM4951ASD/NOPB have thermal shutdown protection?
- Can the gain of the LM4951ASD/NOPB be configured externally?
- What is the shutdown current of the LM4951ASD/NOPB?
The shutdown current is typically 0.01µA.
- What is the turn-on time of the LM4951ASD/NOPB from shutdown mode?
The turn-on time is typically 25ms.
- Does the LM4951ASD/NOPB have short circuit protection?
- What is the operating temperature range of the LM4951ASD/NOPB?
The operating temperature range is from -40°C to 85°C.
- What package type is the LM4951ASD/NOPB available in?
The LM4951ASD/NOPB is available in a WSON (DPR) package with 10 pins.
