LM49270SQ/NOPB
Active2.3-W, STEREO CLASS-D AUDIO AMP WITH 155-MW HEADPHONE AMP & 3D ENHANCEMENT
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LM49270SQ/NOPB
Active2.3-W, STEREO CLASS-D AUDIO AMP WITH 155-MW HEADPHONE AMP & 3D ENHANCEMENT
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Technical Specifications
Parameters and characteristics for this part
| Specification | LM49270SQ/NOPB |
|---|---|
| Features | Volume Control, Short-Circuit and Thermal Protection, Shutdown, I2C, 3D, Depop |
| Max Output Power x Channels @ Load [custom] | 2.2 W, 177 mW |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Output Type | 2-Channel (Stereo) with Stereo Headphones |
| Package / Case | 28-WFQFN Exposed Pad |
| Supplier Device Package | 28-WQFN (5x5) |
| Type | Class D |
| Voltage - Supply [Max] | 5.5 V |
| Voltage - Supply [Min] | 2.4 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 5.41 | |
| Digi-Reel® | 1 | $ 5.41 | ||
| Tape & Reel (TR) | 1000 | $ 2.86 | ||
| 2000 | $ 2.71 | |||
| Texas Instruments | LARGE T&R | 1 | $ 4.27 | |
| 100 | $ 3.48 | |||
| 250 | $ 2.73 | |||
| 1000 | $ 2.32 | |||
Description
General part information
LM49270 Series
The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo headphone amplifier, volume control, headphone sense, and National’s unique 3D sound enhancement into a single device. The LM49270 uses flexible I2C control interface for multiple application requirements.
The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers.
The IC features a headphone sense input (HPS) that automatically detects the presence of a headphone and configures the device accordingly. The LM49270 can automatically switch from OCL headphone output to a line driver output. If the VOC pin is pulled to GND, the VOC amplifier is disabled and the VOC pin is internally set to GND. This feature allows the LM49270 to be used as a line driver in OCL mode without a GND conflict on the headphone jack sleeve. Additionally, the headphone amplifier can be configured as capacitively coupled (CC).
Documents
Technical documentation and resources