Analog Input / BTL Output Class-D Speaker Amplifier - BD5426EFS

BD5426EFS is a 10W + 10W 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 87% (9W + 9W output with 8O load). The IC, inaddition, employs a compact back-surface heat radiation type power package to achieve low power consumption and lowheat generation and eliminates necessity of installing an external radiator, up to a total output of 20W. This product satisfiesboth needs for drastic downsizing, low-profile structures and powerful, high-quality playback of the 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
BD5426EFS-E2 Active HTSSOP-A44 1500 1500 Taping Yes
Vcc(Min.)[V] 10.0
Vcc(Max.)[V] 16.5
Iq[mA] 25.0
Ext. Gain No
Maximum Output Gain[dB] 28.0
I/F Stand alone
Additional Feature Soft clip
Speaker Amp Outputs 2.0
Speaker Amp THD+N[%] 0.1
Speaker Amp Input Type Analog Signal
Speaker Amp Type Class D
Speaker Amp Output Power(Max.)[W] 10
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 85
  • ・ A high efficiency of 87% (9W + 9W output with 8Ω load), which is the highest grade in the industry and low heat-generation.
    ・ An output of 10W + 10W (13V, with 8Ω load) is allowed without an external heat radiator.
    ・ Driving a lowest rating load of 6Ω 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 )
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Technical Data
Application Note

BD5426EFS Evaluation Board Information

Application Note

Thermal Resistance