BM5446EFV Datasheet, PDF (1/33 Pages) Rohm – 20W+20W Class-D Speaker Amplifier for Digital Input with built-in DSP

High Performance Class-D Speaker / Headphone Amplifier Series
20W+20W Class-D Speaker Amplifier
for Digital Input
with built-in DSP
BM5446EFV
No.10075EAT13
●Overview
BM5446EFV is a Class D Speaker Amplifier with built-in DSP (Digital Sound Processor) designed for Flat-panel TVs in
particular for space-saving and low-power consumption, delivers an output power of 20W+20W. This IC employs
state-of-the-art Bipolar, CMOS, and DMOS (BCD) process technology that eliminates turn-on resistance in the output power
stage and internal loss due to line resistances up to an ultimate level. With this technology, the IC can achieve high
efficiency of 86% (10W+10W output with 8Ω load). In addition, the IC is packaged in a compact reverse heat radiation type
power package to achieve low power consumption and low heat generation and eliminates necessity of external heat-sink
up to a total output power of 40W. This product satisfies both needs for drastic downsizing, low-profile structures and many
function, high quality playback of sound system.
●Features
1) This IC includes the DSP (digital sound processor) for Audio signal processing for Flat TVs.
2) This IC has two input systems of digital audio interface.
(I²S/LJ/RJ format,LRCLK: 32kHz /44.1kHz / 48kHz,SYS_CLK: 256fs / 512fs,BCLK: 48fs / 64fs,SDATA: 16 / 20 / 24bit)
3) With wide range of power supply voltage, it is possible to operate with single power supply. (Vcc = 10~26V)
4) With high efficiency and low heat dissipation contributing to miniaturization, slim design, and also power saving of the
system.
5) S/N of the system can be optimized by adjusting the gain selection in 16 steps. (20~35dB,1dB/step)
6) 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.
7) 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).
●Applications
Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc.,
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