Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E 2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and simplifies design.

The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V to 5.5V. The E 2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power shutdown mode reduces supply current consumption to 0.04μA.

The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain of the amplifier to limit the output as the battery voltage decreases.

Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

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Key Specifications

■  Power Output at VDD = 3.6V   RL = 8Ω, THD+N ≤ 1%	1.8W (typ)
■   Efficiency at 3.6V, 800mW into 8Ω	82% (typ)
■  Quiescent Power Supply Current   at 3.6V	14.5mA
■  Shutdown current	0.04μA (typ)

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E 2 S System Reduces EMI while Preserving Audio Quality and Efficiency

Integrated Boost Converter

Supply Voltage Level Detection on Boost Converter

Low Power Shutdown Mode

"Click and Pop" suppression

• Audio input type
• Analog Input
• Architecture
• Class-D Boosted
• Speaker channels (Max)
• Mono
• Power stage supply (Max) (V)
• 5.5
• Power stage supply (Min) (V)
• 2.3
• Load (Min) (ohms)
• 4
• Output power (W)
• 2.7
• SNR (dB)
• 97
• THD + N @ 1 kHz (%)
• 0.03
• Iq (Typ) (mA)
• 14.5
• Control interface
• GPIO
• Closed/open loop
• Closed
• Analog supply (Min) (V)
• 2.3
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 90
• Operating temperature range (C)
• -40 to 85

LM48512的完整型号有：LM48512TL/NOPB、LM48512TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM48512TL/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-16，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LM48512TL/NOPB的批量USD价格：.654（1000+）

LM48512TLX/NOPB，工作温度：-40 to 85，封装：DSBGA (YZR)-16，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LM48512TLX/NOPB的批量USD价格：.545（1000+）

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