〇Product structure : Silicon monolithic integrated circuit 〇This product has no designed protection against radioactive rays

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TSZ02201-0C1C0E900620-1-2

© 2016 ROHM Co., Ltd. All rights reserved.

21.Sep.2016 Rev.003

TSZ22111 • 14 • 001

www.rohm.com

Low Power Consumption Class D Amplifier

9W+9W Analog Input

Class D Speaker Amplifier

BD28412MUV

General Description

BD28412MUV is a 9W+9W stereo (or 18W monaural)

class D amplifier, developed for battery equipped

speaker systems such as wireless speakers. This IC is

incorporated with a precise oscillator to generate

multiple switching frequencies that can avoid the AM

radio interference. In addition, 2.1Ch audio system can

be realized by master and slave operation without beat

noise caused by interference between two ICs.

Furthermore,

this

IC

achieves

lower

power

consumption that eliminates the need for an external

heat sink.

Features



Analog Differential Input



Low Standby Current



Output Feedback Circuitry Prevents Sound

Quality Degradation Caused by Power Supply

Voltage Fluctuation, Achieves Low Noise and Low

Distortion, Eliminates the Need of Large

Electrolytic-Capacitors for Decoupling



Power Limit Function

(Linearly-programmable)



Selectable Switching Frequency

(AM Avoidance Function)



Synchronization Control is Supported

(Selectable Master and Slave Operation)



Parallel BTL (PBTL) is Supported





High Efficiency and Low-heat-generation Make

the System Smaller, Thinner, and More

Power-saving



Pop Noise Prevention During Power Supply

ON/OFF



High Reliability Design by Built-in Protection

Circuits

- Overheat Protection

- Under Voltage Protection

- Output Short Protection

- Output DC Voltage Protection



Small Package (VQFN032V5050) Achieves Mount

Area Reduction

Applications



Wireless Speakers, Small Active Speakers,

Portable Audio Equipments, etc.

Key Specifications



Supply Voltage Range:

4.5V to 13V



Speaker Output Power:

9W+9W (Typ)



Speaker Output Power(PBTL):

18W (Typ)



Total Harmonic Distortion Ratio:

0.03% (Typ) @Po=1W



Crosstalk:

100dB (Typ)



PSRR:

55dB (Typ)



Output Noise Voltage:

-80dBV (Typ)



Standby Current:

0.1µA (Typ)



Operating Current:

16mA (Typ)

(No load or filter, No signal)



Operating Temperature Range:

-25°C to +85°C

Package

W(Typ) x D(Typ) x H(Max)

VQFN032V5050

5.00mm x 5.00mm x 1.00mm

Typical Application Circuit

VQFN032V5050

Figure 1. Typical Application Circuit

Datasheet