The LM48511 integrates a boost converter with a high efficiency Class D audio power amplifier to provide 3W continuous power into an 8Ω speaker when operating from a 5V power supply. When operating from a 3V to 4V power supply, the LM48511 can be configured to drive 1 to 2.5W into an 8Ω load with less than 1% distortion (THD+N). The Class D amplifier features a low noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further reducing the need for output filters.
The LM48511’s switching regulator is a current-mode boost converter operating at a fixed frequency of 1MHz
| LM48511 | |
| Speaker Channels | Mono |
| Speaker Amp Type | Class-D, Class-D Boosted |
| Output Power (W) | 6.7 |
| PSRR (dB) | 88 |
| Special Features | Digital Input |
| Supply Min (Min) (Volt) | 3 |
| Supply Max (Max) (Volt) | 5.5 |
