BD5471MUV ROHM Co. Ltd., BD5471MUV Datasheet - Page 4

• Manufacturer Part Number: BD5471MUV
• Description: Stereo Class-d Speaker Amplifier For Notebook Pc
• Manufacturer: ROHM Co. Ltd.

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(1) Absolute maximum ratings
(2) GND terminal’s potential
(3) Shorting between pins and mounting errors
(4) Operation in strong magnetic fields
(5) Thermal design
(6) Thermal shutdown circuit
(7) Load of the output terminal
(8) The short protection of the output terminal
(9) Operating ranges
(10) Electrical characteristics
(11) Power decoupling capacitor
(12) Power supply
Cautions on use
This IC may be damaged if the absolute maximum ratings for the applied voltage, temperature range, or other parameters
are exceeded. Therefore, avoid using a voltage or temperature that exceeds the absolute maximum ratings.
If it is possible that absolute maximum ratings will be exceeded, use fuses or other physical safety measures and
determine ways to avoid exceeding the IC's absolute maximum ratings.
This IC corresponds to dynamic speaker load, and doesn't correspond to the load except for dynamic speakers.
This IC is built in the short protection for a protection of output transistors.
When the short protection is operated, output terminal becomes Hi-Z condition and is stopped with latch.
Once output is stopped with latch, output does not recover automatically by canceling the short-circuiting condition.
The condition of stopping with latch is cancelled, when power supply or standby signal is turned off and turned on again.
The standard value is in mounting device and parts on surface of ROHM’s board directly.
Use single power supply, because power supplies (4,10,15,21pin) of audio amplifier and regulator are
shorted inside.
Try to set the minimum voltage for GND terminal’s potential, regardless of the operation mode.
When mounting the IC chip on a board, be very careful to set the chip's orientation and position precisely.
When the power is turned on, the IC may be damaged if it is not mounted correctly.
The IC may also be damaged if a short occurs (due to a foreign object, etc.) between two pins, between a pin and
the power supply, or between a pin and the GND.
Note with caution that operation faults may occur when this IC operates in a strong magnetic field.
Ensure sufficient margins to the thermal design by taking in to account the allowable power dissipation during actual
use modes, because this IC is power amp. When excessive signal inputs which the heat dissipation is insufficient
condition, it is possible that thermal shutdown circuit is active.
The rated operating power supply voltage range (VDD=+4.5V～+5.5V) and the rated operating temperature range
(Ta=-40℃～+85℃) are the range by which basic circuit functions is operated. Characteristics and rated output power
are not guaranteed in all power supply voltage ranges or temperature ranges.
Because the big peak current flows through the power line, the class-D amplifier has an influence on the audio
characteristic by the capacitance value or the arrangement part of the power decoupling capacitor.
Select enough small value(more than 10uF) of ESR(Equivalent Series Resistance),
and arrange a power decoupling capacitor as close as possible to the terminal of IC.
When a load is less than 8Ω, arrange a capacitor against to each power supply terminal as close as possible.
This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates,
the output transistors are placed under open status. The thermal shutdown circuit is primarily intended to shutdown
the IC avoiding thermal runaway under abnormal conditions with a chip temperature exceeding Tjmax = +150℃,
and is not intended to protect and secure an electrical appliance.
Electrical characteristics show the typical performance of device and depend on board layout, parts, power supply.
REV. A
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