Class-D Speaker Amplifier for Digital Input with Built-in DSP - BM5446EFV

BM5446EFV is a Class D Speaker Amplifier with built-in DSP (Digital Sound Processor) designed for Flat-panel TVs inparticular for space-saving and low-power consumption, delivers an output power of 20W+20W. This IC employsstate-of-the-art Bipolar, CMOS, and DMOS (BCD) process technology that eliminates turn-on resistance in the output powerstage and internal loss due to line resistances up to an ultimate level. With this technology, the IC can achieve highefficiency of 86% (10W+10W output with 8O load). In addition, the IC is packaged in a compact reverse heat radiation typepower package to achieve low power consumption and low heat generation and eliminates necessity of external heat-sinkup to a total output power of 40W. This product satisfies both needs for drastic downsizing, low-profile structures and manyfunction, high quality playback of sound system.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BM5446EFV-E2 Active HTSSOP-B54 1500 1500 Taping Yes
Vcc(Min.)[V] 10.0
Vcc(Max.)[V] 26.0
Iq[mA] 60.0
Ext. Gain No
I/F 2 wire port
Digital Audio I/F I2S / LJ / RJ
Additional Feature P²Volume P²Bass P²Treble Volume 7 Band EQ 3 Band Tone Surround
Speaker Amp Outputs 2.0
Speaker Amp THD+N[%] 0.07
Speaker Amp Input Type Digital Signal
Speaker Amp Type Class D
Speaker Amp Output Power(Max.)[W] 20
Operating Temperature (Min.)[°C] -25
Operating Temperature (Max.)[°C] 85
  • ・ This IC includes the DSP (digital sound processor) for Audio signal processing for Flat TVs.
    ・ This IC has two input systems of digital audio interface. (I2S/LJ/RJ format, LRCLK: 32 kHz/ 44.1kHz / 48kHz, SYS_CLK: 256fs / 512fs, BCLK: 48fs / 64fs, SDATA: 16 / 20 / 24bit)
    ・ With wide range of power supply voltage, it is possible to operate with single power supply. (Vcc = 10~26V)
    ・ With high efficiency and low heat dissipation contributing to miniaturization, slim design, and also power saving of the system.
    ・ S/N of the system can be optimized by adjusting the gain selection in 16 steps. (20~35dB,1dB/step)
    ・ With built-in feedback circuitry at the output, prevents the decrease in sound quality due to change in power supply voltage. In addition, low noise and low distortion are achieved.
    ・ With a built-in DAC provides best stereo-output for headphone function. As a result, the selection of output of the digital input in two systems is possible.
    8) It has additional S/PDIF output for the LINE output usage.
    9) Eliminates pop-noise generated during the power supply on/off. High quality muting performance is realized by using the soft-muting technology.
    10) This IC is built-in with various protection functions for highly reliability design. (High temperature protection, Under voltage protection, Output short protection, Output DC-Voltage protection and Clock stop protection).
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Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.