Analog Input / BTL Output Class-D Speaker Amplifier - BD5423AEFS

BD5423AEFS is a 17W + 17W stereo class-D power amplifier IC, developed for space-saving and low heat-generationapplications such as low-profile TV sets. The IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD) processtechnology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up to anultimate level. With this technology, the IC has achieved high efficiency of 90% (10W + 10W output with 8O load), which isthe top class in the industry. The IC, in addition, employs a compact back-surface heat radiation type power package toachieve low power consumption and low heat generation and eliminates necessity of installing an external radiator, up to atotal output of 34W. This product satisfies both needs for drastic downsizing, low-profile structures and powerful, highqualityplayback of the sound system.

* This is a standard-grade product.
For Automotive usage, please contact Sales.
Part Number | BD5423AEFS-E2
Status | Active
Package | HTSSOP-A44
Unit Quantity | 1500
Minimum Package Quantity | 1500
Packing Type | Taping
RoHS | Yes








Ext. Gain


Maximum Output Gain[dB]



Stand alone

Additional Feature

Soft clip

Speaker Amp Outputs


Speaker Amp THD+N[%]


Speaker Amp Input Type

Analog Signal

Speaker Amp Type

Class D

Speaker Amp Output Power(Max.)[W]


Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]



・ A high efficiency of 90% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation.
・ An output of 17W + 17W (12V, with 4Ω load) is allowed without an external heat radiator.
・ Driving a lowest rating load of 4Ω is allowed.
・ Pop noise upon turning power on/off and power interruption has been reduced.
・ High-quality audio muting is implemented by soft-switching technology.
・ An output power limiter function limits excessive output to speakers.
・ High-reliability design provided with built-in protection circuits against high temperatures, against VCC shorting and GND shorting, against reduced-voltage, and against applying DC voltage to speaker.
8) A master/slave function allowing synchronization of multiple devices reduces beat noises.
9) Adjustment of internal PWM sampling clock frequencies (250kHz to 400kHz) allows easy protective measures against unwanted radio emission to AM radio band.
10) A compact back-surface heat radiation type power package is employed.
HTSSOP-A44 (5mm × 7.5mm × 1.0mm, pitch 0.8mm )