The LM48511 device integrates a boost converter with a high-efficiency Class D audio power amplifier to provide 3-W continuous power into an 8-Ω speaker when operating from a 5-V power supply.

When operating from a 3-V to 4-V power supply, the LM48511 can be configured to drive 1 to 2.5 W into an 8-Ω load with less than 1% distortion (THD+N). The Class D amplifier features a low-noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further reducing the need for output filters.

The switching regulator of the LM48511 is a current-mode boost converter operating at a fixed frequency of 1 MHz. Two selectable feedback networks allow the LM48511 regulator to dynamically switch between two different output voltages, improving efficiency by optimizing the amplifier’s supply voltage based on battery voltage and output power requirements.

The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5 V, extends battery life when compared to Boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high-output power is not required.

The gain of the LM48511 is set by external resistors, 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. Superior click and pop suppression eliminates audible transients during power-up and shutdown.

• 3-W Output into 8 ? at 5 V With THD+N = 1%
• Selectable spread spectrum mode reduces EMI
• 80% Efficiency
• Independent regulator and amplifier shutdown controls
• Dynamically Selectable Regulator Output Voltages
• Filterless Class D
• 3-V to 5.5-V Operation
• Low shutdown current
• Click and pop suppression
• Key specifications
  • Quiescent power supply current
    • VDD = 3 V 9 mA (Typical)
    • VDD = 5 V 13.5 mA (Typical)
  • PO at VDD = 5 V, PV1 = 7.8 V, RL = 8 ?, THD+N = 1% 3 W (Typical)
  • PO at VDD = 3 V, PV1 = 4.8 V, RL = 8 ?, THD+N = 1% 1 W (Typical)
  • PO at VDD = 5 V, PV1 = 7.8 V, RL = 4 ?, THD+N = 1% 5.4 W (Typical)
  • Shutdown Current at VDD = 3 V, 0.01 μA (Typical)

• 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)
• 3
• Load (Min) (ohms)
• 4
• Output power (W)
• 6.7
• SNR (dB)
• 97
• THD + N @ 1 kHz (%)
• 0.04
• Iq (Typ) (mA)
• 13.5
• Control interface
• Hardware
• Closed/open loop
• Open
• Analog supply (Min) (V)
• 3
• Analog supply (Max) (V)
• 5.5
• PSRR (dB)
• 88
• Operating temperature range (C)
• -40 to 85

LM48511的完整型号有：LM48511SQ/NOPB、LM48511SQX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM48511SQ/NOPB，工作温度：-40 to 85，封装：WQFN (NHZ)-24，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LM48511SQ/NOPB的批量USD价格：1.121（1000+）

LM48511SQX/NOPB，工作温度：-40 to 85，封装：WQFN (NHZ)-24，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LM48511SQX/NOPB的批量USD价格：.951（1000+）

LM48511SQBD — LM48511 集成了高效升压转换器

This LM48511SQDB is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM48511SQ. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load.

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