The LM4938 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4Ω with less than 1.0% THD or 2.2W into 3Ω with less than 1.0% THD.
Boomer audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4938 incorporates a DC volume control, stereo bridged audio power amplifiers and a selectable gain or bass boost, making it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications.
The LM4938 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance.
Note 1: When properly mounted to the circuit board, LM4938MH will deliver 2W into 4Ω. See Application Information section for more information.
Note 2: An LM4938MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.
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| Audio input type | Analog Input |
| Architecture | Class-AB |
| Speaker channels (max) | Stereo |
| Rating | Catalog |
| Power stage supply (max) (V) | 5.5 |
| Power stage supply (min) (V) | 2.7 |
| Load (min) (Ω) | 3 |
| Output power (W) | 2.2 |
| THD + N at 1 kHz (%) | 0.05 |
| Iq (typ) (mA) | 11 |
| Control interface | GPIO |
| Closed/open loop | Open |
| Analog supply (min) (V) | 2.7 |
| Analog supply voltage (max) (V) | 5.5 |
| PSRR (dB) | 78 |
| Operating temperature range (°C) | -20 to 85 |
| HTSSOP (PWP) | 28 | 62.08 mm² 9.7 x 6.4 |
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