| Output power (W) | 0.097 |
| Analog supply (Min) (V) | 1.4 |
| Analog supply (Max) (V) | 3.6 |
| PSRR (dB) | 70 |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 85 |
| Headphone channels | Stereo |
| Volume control | No |
| Shutdown current (ISD) (uA) | 0.01 |
| Architecture | Class-AB (ground-centered) |
| Iq per channel (Typ) (mA) | 5.5 |
- Ground Referenced Outputs
- High PSRR
- Available in Space-Saving TSSOP Package
- Ultra Low Current Shutdown Mode
- Improved Pop and Click Circuitry eliminates Noises During Turn-On and Turn-Off Transitions
- 1.4 – 3.6V Operation
- No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors
- Shutdown Either Channel Independently
Key Specifications
- Improved PSRR at 1kHz: 70dB (Typ)
- Power Output at VDD = 3V, RL = 16?, THD ≦ 1%: 95mW (Typ)
- Shutdown Current: 0.01μA (Typ)
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The LM4917 is a stereo, output capacitor-less headphone amplifier capable of delivering 95mW of continuous average power into a 16? load with less than 1% THD+N from a single 3V power supply.
The LM4917 provides high quality audio reproduction with minimal external components. A ground referenced output eliminates the output coupling capacitors typically required by single-ended loads, reducing component count, cost and board space consumption. This makes the LM4917 ideal for mobile phones and other portable equipment where board space is at a premium. Eliminating the output coupling capacitors also improves low frequency response.
The LM4917 operates from a single 1.4V to 3.6V power supply, features low 0.02% THD+N and 70dB PSRR. Independent right/left channel low-power shutdown controls provide power saving flexibility for mono/stereo applications. Superior click and pop suppression eliminates audible transients during start up and shutdown. Short circuit and thermal overload protection protects the device during fault conditions.