LM4990 - 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level

LM4990是TI德州仪器公司的一款扬声器放大器（AB类/D类）产品，LM4990是2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level，本站介绍了LM4990的封装应用图解、特点和优点、功能等，并给出了与LM4990相关的TI元器件型号供参考。

LM4990 - 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level - 扬声器放大器（AB类/D类） - 低功耗放大器 - 德州仪器

产品描述

The LM4990 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1.25 watts of continuous average power to an 8? BTL load and 2 watts of continuous average power (NGZ and DGQ only) to a 4? BTL load with less than 1% distortion (THD+N+N) from a 5VDC power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4990 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.

The LM4990 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown pin to be driven in a likewise manner to enable shutdown.

The LM4990 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions.

The LM4990 is unity-gain stable and can be configured by external gain-setting resistors.

产品特性

Available in Space-Saving Packages: WSON, Exposed-DAP MSOP-PowerPAD, VSSOP, and DSBGA
Ultra Low Current Shutdown Mode
Improved Click and Pop Circuitry Eliminates Noise During Turn-On and Turn-Off Transitions
2.2 - 5.5V Operation
No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required
Unity-Gain Stable
External Gain Configuration Capability
User Selectable Shutdown High or Low Logic Level

Key Specifications

Improved PSRR at 217Hz & 1KHz: 62dB
Power Output at 5.0V, 1% THD+N,
- 4? (NGZ and DGQ only): 2W (Typ)
Power Output at 5.0V, 1% THD+N, 8?: 1.25W (Typ)
Power Output at 3.0V, 1% THD+N, 4?: 600mW (Typ)
Power Output at 3.0V, 1% THD+N, 8?: 425mW (Typ)
Shutdown Current: 0.1µA (Typ)

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