ROHM BD5424EFS Data Sheet

Middle Power Class-D Speaker Amplifiers

Analog Input / BTL Output Class-D Speaker Amplifier

No.10075EBT04

BD5424EFS

●Description BD5424EFS is a 20W + 20W 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 91% (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 40W. This product satisfies both needs for drastic downsizing, low-profile structures and powerful, high-quality playback of the sound system.

●Features 1) A high efficiency of 91% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation. 2) An output of 20W + 20W (17V, with 8Ω load) is allowed without an external heat radiator. 3) Driving a lowest rating load of 3.6Ω is allowed. 4) Pop noise upon turning power on/off and power interruption has been reduced. 5) High-quality audio muting is implemented by soft-switching technology. 6) An output power limiter function limits excessive output to speakers. 7) 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 (350k Hz to 500k Hz) 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)

●Absolute Maximum Ratings A circuit must be designed and evaluated not to exceed absolute maximum rating in any cases and even momentarily, to prevent reduction in functional performances and thermal destruction of a semiconductor product and secure useful life and reliability. The following values assume Ta =25℃. For latest values, refer to delivery specifications.

Parameter Symbol Ratings Unit Conditions

Supply voltage VCC +20 V Pin 7, 8, 15, 16, 29, 30, 37, 38, 40

(Note 1, 2) (Note 3)

Power dissipation Pd 2.0

4.5 (Note 4)

Input voltage for signal pin VIN -0.2 ~ +7.2 V Pin 1, 44 (Note 1)

Input voltage for control pin VCONT -0.2 ~ Vcc+0.2 V Pin 20, 24 (Note 1)

Input voltage for clock pin VOSC -0.2 ~ +7.2 V Pin 23 (Note 1)

Operating temperature range Topr -40 ~ +85 ℃

Storage temperature range Tstg -55 ~ +150 ℃

Maximum junction temperature Tjmax +150 ℃ (Note 1) A voltage that can be applied with reference to GND (pins 11, 12, 33, 34, and 43) (Note 2) Pd and Tjmax=150℃ must not be exceeded. (Note 3) 70mm × 70mm × 1.6mm FR4 One-sided glass epoxy board (Back copper foil 0%) installed. If used under Ta=25℃ or higher, reduce 16m W for increase of every 1℃. The board is provided with thermal via. (Note 4) 70mm × 70mm × 1.6mm FR4 Both-sided glass epoxy board (Back copper foil 100%) installed. If used under Ta=25℃ or higher, reduce 36m W for increase of every 1℃. The board is provided with thermal via.

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