供应微源 LPA4891 3W音频功率放大器

LPSemi/微源半导体 LPA4891 MSOP-8 3W无滤波器单声道音频功率放大器

General Description

The LPA4891 is an audio power amplifier designed for portable applications such as GPS trackers. The LPA4891 is capable of delivering 3W of continuous average power to a 4? load from a 5.2V power supply with less than 10% distortion (THD+N).The LPA4891 is designed specifically to provide high quality output audio power with a minimal number of external components. The LPA4891 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited where minimal board or solution size is a primary requirement. It features a low-power shutdown mode, which is achieved by driving the /SHDN pin with logic low. Additionally, the device features an internal thermal shutdown protection.The device contains circuitry to prevent “pop and click” noise that would occur during turn-on and turn-off transitions. For maximum flexibility, the device provides an externally controlled gain (with resistors), as well as an externally controlled turn-on and turn-off times (with the bypass capacitor). The device is available in a MSOP-8 package.

Features
◆ 2.5-5.5V Operation Voltage
◆ 0.1μA Ultra-low Current Shutdown Mode
◆ Improved Pop & Click Circuitry
◆ Unique Modulation Scheme Reduces EMI Emissions
◆ No Output Filter Required
◆ Output Power (PO) at 10% THD+N:
VDD=5V, 4Ω load, 2.9W(typ)
VDD=5V, 8Ω load, 1.7W(typ)
◆ External Gain Configuration Capability
◆ 0.4V Compatible Threshold for /SHDN Pin
◆ BTL Output Supporting Capacitive Loads
◆ RoHS Compliant and 100% Lead(Pb)-Free
◆ Package: SOP-8

Applications
◆ PMP
◆ PSP
◆ Game Machine
◆ GPS Tracker
◆ Portable Electronic Devices

产品规格书（部分）