Overview
The LM4673SD/NOPB is a high-efficiency, 2.65W, mono, Class D audio power amplifier designed by Texas Instruments. This device is part of the Boomer and PowerWise series, known for its advanced features and reliability in modern audio systems. The LM4673SD/NOPB operates within a wide supply voltage range of 2.4V to 5.5V, making it versatile for various battery-powered and line-powered applications. It is housed in a compact 8-WSON (3x3) package, suitable for surface-mount assembly, and is ideal for space-constrained designs in portable audio equipment, such as mobile phones, PDAs, and other consumer electronics.
Key Specifications
| Parameter | Conditions | Typical | Limit |
|---|---|---|---|
| Efficiency at 3.6V, 400mW into 8Ω Speaker | - | 88% | - |
| Efficiency at 3.6V, 100mW into 8Ω Speaker | - | 80% | - |
| Efficiency at 5V, 1W into 8Ω Speaker | - | 86% | - |
| Quiescent Current, 3.6V Supply | - | 2.1mA | - |
| Total Shutdown Power Supply Current | - | 0.01µA | - |
| Single Supply Range | - | 2.4V to 5.5V | - |
| PSRR, f = 217Hz | - | 78dB | - |
| Output Power | Into 8Ω Load | 2.65W | - |
| THD + N at 1 kHz | - | 0.03% | - |
| SNR | - | 97dB | - |
| Operating Temperature Range | - | -40°C to 85°C | - |
Key Features
- Mono Class D Operation
- No Output Filter Required for Inductive Loads
- Externally Configurable Gain
- Very Fast Turn On Time: 17μs (typ)
- Minimum External Components
- 'Click and Pop' Suppression Circuitry
- Micro-Power Shutdown Mode
- Comprehensive protection mechanisms including short-circuit and thermal protection
- Differential inputs to reduce noise and distortion
- PWM interface
- Ultra-low standby current of less than 1µA
Applications
The LM4673SD/NOPB is typically suited for a variety of audio applications, particularly in portable devices. Key applications include:
- Mobile phones
- PDAs
- Portable audio systems
- Headphones
- Other consumer electronics requiring high efficiency and small footprint
Q & A
- What is the maximum output power of the LM4673SD/NOPB?
The LM4673SD/NOPB can deliver up to 2.65W of continuous output power into an 8Ω load.
- What is the supply voltage range for the LM4673SD/NOPB?
The device operates within a supply voltage range of 2.4V to 5.5V.
- What is the efficiency of the LM4673SD/NOPB at 3.6V and 400mW into an 8Ω speaker?
The efficiency is typically 88% at 3.6V and 400mW into an 8Ω speaker.
- Does the LM4673SD/NOPB require an output filter for inductive loads?
No, the LM4673SD/NOPB does not require an output filter for inductive loads due to its filterless PWM architecture.
- What is the quiescent current of the LM4673SD/NOPB in shutdown mode?
The quiescent current in shutdown mode is typically 0.01µA.
- What protection mechanisms are included in the LM4673SD/NOPB?
The device includes comprehensive protection mechanisms such as short-circuit protection, thermal protection, and under-voltage lockout.
- What is the operating temperature range of the LM4673SD/NOPB?
The operating temperature range is from -40°C to 85°C.
- Is the LM4673SD/NOPB RoHS compliant?
- What is the typical turn-on time for the LM4673SD/NOPB?
- Can the gain of the LM4673SD/NOPB be externally configured?
