BD5423AEFS is a 17W + 17W stereo class-D power amplifier IC, developed for space-saving and low heat-generation applications such as low-profile TV sets. The 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 has achieved high efficiency of 90% (10W + 10W output with 8Ω load), which is the top class in the industry. The IC, in addition, employs a compact back-surface heat radiation type power package to achieve low power consumption and low heat generation and eliminates necessity of installing an external radiator, up to a total output of 34W. This product satisfies both needs for drastic downsizing, low-profile structures and powerful, high- quality playback of the sound system.
The BD5423AEFS is a 17 W + 17 W stereo Class‑D power‑amplifier IC designed for low‑profile TV sets and other space‑saving applications. It offers high efficiency (up to 90 %) and operates without an external heat sink, thanks to its compact back‑surface heat‑radiation package.
The document includes detailed electrical characteristics, absolute maximum ratings, operating conditions, pin assignments, package dimensions, and ordering information. Graphs illustrate output power, efficiency, THD, and noise performance across supply voltages and load conditions.
| Output Power (per channel) | 17 W |
|---|---|
| Supply Voltage Range | +10 V to +16.5 V |
| Load Resistance Range | 4 Ω to 16 Ω |
| Maximum Junction Temperature | +150 °C |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | HTSSOP‑A44 (6 mm × 7.5 mm × 1.0 mm, 0.8 mm pitch) |
| THD+N | 0.1 % |
| Input Voltage (signal pin) | -0.2 V to +7.2 V |
| Output Noise Voltage | 80 µV rms |
The IC can deliver up to 17 W per channel (17 W + 17 W) into a 4 Ω load.
The device operates with a supply voltage from +10 V to +16.5 V.
It is supplied in an HTSSOP‑A44 package (6 mm × 7.5 mm × 1.0 mm, 0.8 mm pitch).