The LM4675 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4675 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4? speaker load at a continuous average output of 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency.

The LM4675 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8? speaker, the IC's efficiency for a 100mW power level is 80%, reaching 89% at 400mW output power.

The LM4675 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).

The gain of the LM4675 is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions.

• Spread Spectrum Architecture Reduces EMI
• Mono Class D Operation
• No Output Filter Required for Inductive Loads
• Externally Configurable Gain
• Very Fast Turn On Time: 17μs (typ)
• Minimum External Components
• "Click and Pop" Suppression Circuitry
• Micro-Power Shutdown Mode
• Available in Space-Saving 0.5mm Pitch DSBGA and WSON Packages

Key Specifications

• Efficiency at 3.6V, 400mW into 8? Speaker: 89% (typ)
• Efficiency at 3.6V, 100mW into 8? Speaker: 80% (typ)
• Efficiency at 5V, 1W into 8? Speaker: 89% (typ)
• Quiescent Current, 3.6V Supply: 2.2mA (typ)
• Total Shutdown Power Supply Current: 0.01μA (typ)
• Single Supply Range: 2.4V to 5.5V
• PSRR, f = 217Hz: 82dB

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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)
• 2.4
• Load (Min) (ohms)
• 4
• Output power (W)
• 2.7
• SNR (dB)
• 97
• THD + N @ 1 kHz (%)
• 0.03
• Iq (Typ) (mA)
• 2.8
• Control interface
• Hardware
• Closed/open loop
• Open
• Analog supply (Min) (V)
• 2.4
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 82
• Operating temperature range (C)
• -40 to 85

LM4675的完整型号有：LM4675SD/NOPB、LM4675SDX/NOPB、LM4675TL/NOPB、LM4675TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM4675SD/NOPB，工作温度：PropertyValue，封装：WSON (NGQ)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4675SD/NOPB的批量USD价格：.702（1000+）

LM4675SDX/NOPB，工作温度：PropertyValue，封装：WSON (NGQ)-8，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM4675SDX/NOPB的批量USD价格：.585（1000+）

LM4675TL/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LM4675TL/NOPB的批量USD价格：.702（1000+）

LM4675TLX/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LM4675TLX/NOPB的批量USD价格：.585（1000+）

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The LM4675 is a class D filterless BOOMER audio amplifier with ultra low EMI. National's new spread spectrum technology has been integrated with the latest BOOMER performance characteristics in a 0.5mm pitch, micro SMD package. The LM4675 is designed for high output, low EMI and space saving (...)

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