Overview
The LM4889MAX/NOPB is a 1 Watt audio power amplifier designed by Texas Instruments, primarily for demanding applications in mobile phones and other portable communication devices. This amplifier is notable for its low power consumption, making it ideal for applications where minimal power usage is crucial. It features an ultra-low current shutdown mode and advanced pop & click circuitry to eliminate noise during turn-on and turn-off transitions.
Key Specifications
| Parameter | Conditions | Typical | Limit |
|---|---|---|---|
| Supply Voltage (VDD) | 2.2V to 5.5V | - | - |
| Operating Temperature Range | -40°C to 85°C | - | - |
| Quiescent Power Supply Current (IDD) at VDD = 5V | VIN = 0V, Io = 0A, no Load | 4 mA | 8 mA (max) |
| Quiescent Power Supply Current (IDD) at VDD = 3.3V | VIN = 0V, Io = 0A, no Load | 3.5 mA | 7 mA (max) |
| Shutdown Current (ISD) | Vshutdown = GND | 0.01 µA | 2 µA (max) |
| Output Power at VDD = 5V & 2% THD | f = 1kHz, 8Ω load | 1.0 W | - |
| Output Power at VDD = 3.3V & 1% THD | f = 1kHz, 8Ω load | 400 mW | - |
| Total Harmonic Distortion + Noise (THD+N) | Po = 0.25Wrms; f = 1kHz | 0.1 % | - |
| Power Supply Rejection Ratio (PSRR) at 217Hz | Vripple = 200mV sine p-p | 60 dB | - |
Key Features
- Unity-gain stable and can be configured by external gain-setting resistors.
- Ultra-low current shutdown mode achieved by driving the shutdown pin with a logic low.
- Advanced pop & click circuitry to eliminate noise during turn-on and turn-off transitions.
- Internal thermal shutdown protection mechanism.
- No snubber or bootstrap capacitors required.
- Improved PSRR at 217Hz and 1kHz.
Applications
- Mobile Phones
- PDAs
- Portable Electronic Devices
- Other low-voltage applications where minimal power consumption is a primary requirement.
Q & A
- What is the primary application of the LM4889MAX/NOPB?
The LM4889MAX/NOPB is primarily designed for demanding applications in mobile phones and other portable communication devices. - What is the supply voltage range for the LM4889MAX/NOPB?
The supply voltage range is from 2.2V to 5.5V. - What is the typical output power at VDD = 5V and 2% THD?
The typical output power at VDD = 5V and 2% THD is 1.0 W. - How is the shutdown mode achieved in the LM4889MAX/NOPB?
The shutdown mode is achieved by driving the shutdown pin with a logic low. - What is the typical quiescent power supply current at VDD = 3.3V?
The typical quiescent power supply current at VDD = 3.3V is 3.5 mA. - Does the LM4889MAX/NOPB require snubber or bootstrap capacitors?
No, the LM4889MAX/NOPB does not require snubber or bootstrap capacitors. - What is the improved PSRR at 217Hz?
The improved PSRR at 217Hz is 60 dB. - What is the total harmonic distortion + noise (THD+N) at Po = 0.25Wrms and f = 1kHz?
The THD+N at Po = 0.25Wrms and f = 1kHz is 0.1%. - What is the operating temperature range for the LM4889MAX/NOPB?
The operating temperature range is from -40°C to 85°C. - Does the LM4889MAX/NOPB have internal thermal shutdown protection?
Yes, the LM4889MAX/NOPB has an internal thermal shutdown protection mechanism.
