Features
| • | No output coupling capacitors, snubber networks or bootstrap capacitors required |
| • | Unity gain stable |
| • | Externally configurable gain |
| • | Ultra low current active low shutdown mode |
| • | BTL output can drive capacitive loads up to 100pF |
| • | "Click and pop" suppression circuitry |
| • | 2.7V - 9.0V operation |
| • | Available in space-saving microSMD package |
Description The LM4954 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 2.4 Watts of continuous average power to an 8 BTL load with less than 1% THD+N from a 7VDC power supply.
Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal number of external components. The LM4954 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for lower-power portable applications where minimal space and power consumption are primary requirements.
The LM4954 features a low-power consumption global shutdown mode which is achieved by driving the shutdown pin with logic low. Additionally, the LM4954 features an internal thermal shutdown protection mechanism.
The LM4954 contains advanced pop & click circuitry which eliminates noises that would otherwise occur during turn-on and turn-off transitions.
The LM4954 is unity-gain stable and can be configured by external gain-setting resistors.
Key Specification
| Wide Power Supply Voltage Range | 2.7 <= VDD <= 9V |
| Output Power: VDD = 7V, 1% THD+N | 2.4W (typ) |
| Quiescent power supply current | 3mA (typ) |
| PSRR: VDD = 5V and 3V at 217Hz | 80dB (typ) |
| Shutdown power supply current | 0.01µA (typ) |
Applications
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