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 1 MHz.
Two selectable feedback networks allow the LM48511 regulator to dynamically switch between two different output voltages, improving efficiency by optimizing the amplifier’s supply voltage based on battery voltage and output power requirements.
The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5V, extends battery life when compared to boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high output power is not required.
| Manufacturer | Texas Instruments |
|---|---|
| Category | Audio Amplifiers |
| Eval Board Part Number | 296-35152-ND |
| Eval Board Supplier | Texas Instruments |
| Eval Board |
Normally In Stock
|
| Amplifier Type |
Class D
|
| Number of Outputs |
Mono
|
| Output Power (RMS) @ Load |
6.7 W @ 4 Ω
|
| Voltage In |
3 ~ 5.5 V
|
| THD+N (1kHz) @ Conditions |
< 0.03% @ 2 W (8 Ω, 5V)
< 0.04% @ 3W (4Ω, 5V) |
| Features |
Click and Pop Suppression
Filterless Output Frequency Jitter for EMI Short Circuit Protection Shutdown, Enable, Standby Soft Start Thermal Protection |
| Efficiency @ Conditions |
>70%, 0.5 ~ 3.5 W @ 8Ω, 5V
>70%, 0.2 ~ 1.2W @ 8Ω, 3V |
| Standby Current [Typical] |
110 nA
|
| Quiescent Current [Typical] |
13.5 mA (FF), 14.5 mA (SS)
|
| Component Count + Extras |
13 + 0
|
| Application / Target Market |
Audio: MP3 Players
Cell Phones Digital Cameras GPS Handheld games Portable Devices Tablets |
| Design Author |
Texas Instruments
|
| Main I.C. Base Part |
LM48511
|
| Quiescent Current [Maximum] |
22 mA
|
| Standby Current [Maximum] |
1 µA
|
| Date Created By Author | 2008-11 |
| Date Added To Library | 2013-03 |
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