The LM48312 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48312 features TI’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.

The LM48312 is designed to meet the demands of portable multimedia devices. Operating from a single 5V supply, the device is capable of delivering 2.6W of continuous output power to a 4? load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48312 features both a spread spectrum modulation scheme, and an advanced, patented edge rate control (ERC) architecture that significantly reduces emissions, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%).

The LM48312 features high efficiency compared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving an 8? speaker from a 5V supply, the device operates with 88% efficiency at P_O = 1W. The LM48312 features five gain settings, selected through a single logic input, further reducing solution size. A low power shutdown mode reduces supply current consumption to 0.01µA.

Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

• 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 DSBGA Package

Key Specifications

• Efficiency at 3.6V, 400mW into 8?, 84% (Typ)
• Efficiency at 5V, 1W into 8?, 88% (Typ)
• Quiescent Power Supply Current at 5V, 3.1mA
• Power Output at VDD = 5V, RL = 4?
  • THD+N ≤ 10%, 2.6W (Typ)
  • THD+N ≤ 1%, 2.1W (Typ)
• Power Output at VDD = 5V, RL = 8?
  • THD+N ≤ 10%, 1.6W (Typ)
  • THD+N ≤ 1%, 1.3W (Typ)
• Shutdown Current, 0.01μA (Typ)

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• Audio input type
• Analog Input
• Architecture
• Class-D
• Speaker channels (Max)
• Mono
• Power stage supply (Max) (V)
• 5.5
• Power stage supply (Min) (V)
• 2.7
• Load (Min) (ohms)
• 4
• Output power (W)
• 2.6
• SNR (dB)
• 95
• THD + N @ 1 kHz (%)
• 0.03
• Iq (Typ) (mA)
• 3.1
• Control interface
• Hardware
• Closed/open loop
• Open
• Analog supply (Min) (V)
• 2.5
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 71
• Operating temperature range (C)
• -40 to 85

LM48312的完整型号有：LM48312TLE/NOPB、LM48312TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM48312TLE/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-9，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM48312TLE/NOPB的批量USD价格：.702（1000+）

LM48312TLX/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-9，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM48312TLX/NOPB的批量USD价格：.585（1000+）

LM48312 TINA-TI Reference Design

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