Available in space-saving 0.5mm pitch micro SMD and LLP packages
Description
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 4Ω 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
8Ω 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.
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 applications such as mobile phones and other portable communication devices. This all new BOOMER delivers typically 1.3 Watts of power output in 8 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply.
The LM4675TLBD and LM4675SDBD are evaluation boards designed for rapid user evaluation and saving customers valuable development expense with faster time to market. The evaluation boards include a measurement filter and are ready-to-use in a stand-alone approach that simply requires power and GND, input signal and an output load.
Features:
Tiny 3.0 x 3.0 mm 0.8 mm pitch 8 pin LLP package
Very low IDDq (1.6mA at 2.4V)
Ultra low EMI suppression of more than 11dB below FCC standard at 6" cable length
PSRR 82dB at 217Hz
CMRR 80dB at 217Hz
SNR 97dB
THD+N 0.02% (Pout = 100mW @ 3.6V)
Applications:
Mobile phones
PDAs
Portable electronic devices and accessories
Contents:
Fully Assembled LM4675 Evaluation Board
Instructions for where to locate and download the datasheet
Please note: application information and board layout can be found in the LM4675 datasheet
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 applications such as mobile phones and other portable communication devices. This all new BOOMER delivers typically 1.3 Watts of power output in 8 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply.
The LM4675TLBD and LM4675SDBD are evaluation boards designed for rapid user evaluation and saving customers valuable development expense with faster time to market. The evaluation boards include a measurement filter and are ready-to-use in a stand-alone approach that simply requires power and GND, input signal and an output load.
Features:
Tiny 1.514 x 1.514 mm 0.5mm pitch micro SMD package
Very low IDDq (1.6mA at 2.4V)
Ultra low EMI suppression of more than 11dB below FCC standard at 6" cable length
PSRR 82dB at 217Hz
CMRR 80dB at 217Hz
SNR 97dB
THD+N 0.02% (Pout = 100mW @ 3.6V)
Applications:
Mobile phones
PDAs
Portable electronic devices and accessories
Contents:
Fully Assembled LM4675 Evaluation Board
Instructions for where to locate and download the datasheet
Please note: application information and board layout can be found in the LM4675 datasheet
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
LM4675
