LM48312TLX

Boomer™ Audio Power Amplifier Series 2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power Amplifier with E2S

General Description

The LM48312 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48312 features National’s Enhanced Emissions Suppression E2S system, that features a unique patented ultra low EMI, spread spectrum, PWM architecture, that significantly reduces RF emissions while preserving audio quality and efficiency. The E2S system improves battery life, reduces external component count, board area consumption, and system cost, simplifying design.

Key Specifications

■ Efficiency at 3.6V, 400mW into 8Ω 84% typ

■ Efficiency at 5V, 1W into 8Ω 88% typ

■ Quiescent Power Supply Current at 5V 3.1mA

■ Power Output at VDD = 5V, RL = 4Ω

THD+N ≤ 10% 2.6W typ

THD+N ≤ 1% 2.1W typ

■ Power Output at VDD = 5V, RL = 8Ω

THD+N ≤ 10% 1.6W typ

THD+N ≤ 1% 1.3W typ

■ Shutdown current 0.01μA typ

Features

■ Passes FCC Class B Radiated Emissions with 20 inches of cable

■ E2S System Reduces EMI while Preserving Audio Quality and Efficiency

■ Output Short Circuit Protection with Auto-Recovery

■ No output filter required

■ Improved Audio Quality

■ Minimum external components

■ Five Logic Selectable Gain Settings 0, 3, 6, 9, 12dB

■ Low Power Shutdown Mode

■ Click and Pop suppression

■ Available in space-saving microSMD package

Applications

■ Mobile phones

■ PDAs

■ Laptops