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2010.05 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
Middle Power Class-D Speaker Amplifiers
Analog Input / BTL Output
Class-D Speaker Amplifier
BD5426EFS
●Description
BD5426EFS is a 10W + 10W 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 87% (9W + 9W output with 8Ω load). 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 20W. 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 87% (9W + 9W output with 8Ω load), which is the highest grade in the industry and low heat-generation.
2) An output of 10W + 10W (13V, with 8Ω load) is allowed without an external heat radiator.
3) Driving a lowest rating load of 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 (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 )
●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)
Power dissipation Pd
2.0 W (Note 3)
4.5 W (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 × 1.6mmFR4 One-sided glass epoxy board (Back copper foil 0%) installed.
If used under Ta=25℃ or higher, reduce 16mW for increase of every 1℃. The board is provided with thermal via.
(Note 4) 70mm × 70mm × 1.6mmFR4 Both-sided glass epoxy board (Back copper foil 100%) installed.
If used under Ta=25℃ or higher, reduce 36mW for increase of every 1℃. The board is provided with thermal via.
No.10075EBT05
