LM4675

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Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum

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Product details

Parameters

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 Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

DSBGA (YZR) 9 4 mm² 1.572 x 1.572 WSON (NGQ) 8 9 mm² 3 x 3 open-in-new Find other Speaker amps

Features

  • 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 8Ω Speaker: 89% (typ)
  • Efficiency at 3.6V, 100mW into 8Ω Speaker: 80% (typ)
  • Efficiency at 5V, 1W into 8Ω 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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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.

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Technical documentation

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No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet Ultra-Low EMI, Fltrles, 2.65W, Mono, ClassD Audio Pwr Amp w/Sprd Spectrum datasheet (Rev. C) May 01, 2013
Application notes Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) Aug. 26, 2019
Application notes AN-1849 An Audio Amplifier Power Supply Design (Rev. C) Jun. 27, 2019
Application notes AN-1737 Managing EMI in Class D Audio Applications (Rev. A) May 01, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
$149.00
Description

The LM4675 is a class D filterless BOOMER audio amplifier with ultra low EMI. TI'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 (...)

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 (...)
EVALUATION BOARDS Download
$149.00
Description

The LM4675 is a class D filterless BOOMER audio amplifier with ultra low EMI. TI'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 (...)

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 (...)

Design tools & simulation

CALCULATION TOOLS Download
Coefficient Calculator For Digital Biquad Filters
COEFFICIENT-CALC COEFFICIENT-CALC (TIBQ) calculates the coefficients for the digital filter biquad transfer function implemented in TI audio codecs. The characteristics of the digital filter are adjusted by selecting a filter type and moving a control point within a window that shows the transfer function gain and (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 9 View options
WSON (NGQ) 8 View options

Ordering & quality

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