BD5423AEFSE2 - ROHM SEMICONDUCTOR

1/17

www.rohm.com 2010.05 - Rev.B

Middle Power Class-D Speaker Amplifiers

Analog Input / BTL Output

Class-D Speaker Amplifier

BD5423AEFS

●Description

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 8 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 generati on 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.

●Features

1) A high efficiency of 90% (10W + 10W output wit h 8 load),

which is the highest grade in the industry and low heat-generation.

2) An output of 17W + 17W (12V, with 4 loa d) i s allowed without an external heat radiator.

3) Driving a lowest rating load of 4 is allowed.

4) Pop noise upon turning power on/off and power interruption has been reduced.

5) High-quality audio muti ng 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 circ uits against high temperatures,

against VCC shorting and GND shortin g, aga inst reduced-voltage, and against applyi ng DC voltage to speaker.

8) A master/slave function allo wing synchronization of multiple devices reduces beat noises.

9) Adjustment of internal PWM sampling clock frequencies (25 0kHz 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 performanc es and thermal d estruction of a semicon ductor product and secure usefu l 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 temper ature 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 16mW 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 36mW for increase of every 1℃. The board is provided with thermal via.

No.10075EBT02

Technical Note

2/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Operating Conditions

The following values assume Ta =25℃. Check for latest values in delivery specifications.

Parameter Symbol Ratings Unit Conditions

Supply voltage VCC +10～+16.5 V Pin 7, 8, 15, 16, 29, 30, 37, 38, 40

Load resistance RL 4 ～ 16  (Note 5)

(Note 5) Pd should not be exceeded.

●Electrical Characteristics

Except otherwise specified Ta = 25℃, VCC = 12V, fIN = 1kHz, Rg = 0, RL = 8、MUTEX="H", MS="L"

For latest values, refer to delivery specifications.

Parameter Symbol Limits Unit Conditions

Whole circuit

Circuit current 1

(Sampling mode) ICC1 25 mA With no signal

Circuit current 2

(Muting mode) ICC2 10 mA MUT EX = “L”

Control circuit

“H” level input voltage VIH 2.3～12 V SDX, MUTEX, MS

“L” level input voltage VIL 0～0.8 V SDX, MUTEX, MS

Audio circuit

Voltage gain GV 28 dB PO = 1W

Maximum output power 1 (Note 6) PO1 10 W THD+N = 10%, RL = 8

Maximum output power 2 (Note 6) PO2 17 W THD+N = 10%, RL = 4

Total harmonic distortion (Note 6) THD 0.1 % PO = 1W, BW=20Hz～20kHz

Crosstalk CT 85 dB PO = 1W, Rg = 0, BW = IHF-A

Output noise voltage

(Sampling mode) VNO 80 µVrms Rg = 0, BW = IHF-A

Residual noise voltage

(Muting mode) VNOM 1 µVrms Rg = 0, BW = IHF-A, MUTEX = “L”

Internal sampling clock frequency FOSC 250 kHz MS = “L” (In master operation)

(Note 6) The rated values of items above indicate average performances of the device, which largely depend on circuit layouts, components,

and power supplies. The reference values are those applicable to the dev ice and components directly installed on a board specified by us.

Technical Note

3/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

10 100 1000 10000 100000

FREQUENCY (Hz)

VOLTAGE GAIN (dB)

Vcc=12V

RL=8Ω

Po=1W

L=33µH

C=0.47µF

Cｇ=0.1µF

-100

-80

-60

-40

-20

10 100 1000 10000 100000

FREQUENCY (Hz)

CROSSTALK (dB)

Vcc=12V

RL=8Ω

Po=1W

BW=20～20kHz

-100

-80

-60

-40

-20

0.001 0.01 0.1 1 10 100

OUTPUT POWER (W)

CROSSTALK (dB)

Vcc=12V

RL=8Ω

fin=1kHz

BW=20～20kHz

8 1012141618

VCC (V)

OUTPUT POWER (W)

THD=10%

THD=1%

RL=8Ω

fin=1kHz

0.01

0.1

100

10 100 1000 10000 100000

FREQUENCY (Hz)

THD+N (%)

Vcc=12V

RL=8Ω

Po=1W

BW=20～20kHz

0.01

0.1

100

0.001 0.01 0.1 1 10 100

OUTPUT POWER (W)

THD+N (%)

100Hz

1kHz

6kHz

Vcc=12V

RL=8Ω

BW=20～20kHz

●Electrical characteristic curves (Reference data)

(1) Under Stereo Operation(RL=8)

Fig. 1 THD+N － Output power Fig. 2 THD+N － Frequency

Fig. 3 Voltage gain - Frequenc y Fig. 4 Crosstalk - Frequency

Fig. 5 Crosstalk - Output power Fig. 6 Output power - Power supply voltage

Technical Note

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BD5423AEFS

www.rohm.com 2010.05 - Rev.B

100

0 5 10 15 20

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=12V

RL=8Ω

fin=1kHz

100

0 5 10 15 20

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=10V

RL=8Ω

fin=1kHz

100

0 5 10 15 20

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=16.5V

RL=8Ω

fin=1kHz

0 5 10 15 20 25 30 35 40

TOTAL OUTPUT POWER (W)

ICC (A)

Vcc=10V

Vcc=12V

Vcc=16.5V

RL=8Ω

fin=1kHz

●Electrical characteristic curves (Refer ence data) – Continued

Fig. 7 Efficiency - Output power Fig. 8 Efficiency - Output power

Fig. 9 Efficiency - Output power Fig. 10 Current consumption - Output power

Fig. 11 Current consumption - Power supply voltage Fig. 12 FFT of Output Noise Voltage

Without

-140

-120

-100

-80

-60

-40

-20

10 100 1000 10000 100000

FREQUENCY (Hz)

NOISE FFT (dBV)

Vcc=12V

RL=8Ω

無信号時

BW=20～20kHz

100

8 1012141618

VCC (V)

ICC (mA)

Sampling

Mute

RL=8Ω

無信号時

L=8Ω

Without signal Vcc =12V

RL=8Ω

Without signal

BW=20 ～ 20kHz

Technical Note

5/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Electrical characteristic curves (Refer ence data) – Continued

MUTEX

Pin 20

Pin 26

Speaker

Output

10msec/div

2V/div

5V/div

10V/div Vcc=12V

RL=8Ω

Po=500mW

fin=500Hz

MUTEX

Pin 20

Pin 26

10msec/div

2V/div

5V/div

10V/div Vcc=12V

RL=8Ω

Po=500mW

fin=500Hz

Speaker

Output

Fig. 13 Wave form when Releasing Soft-mute Fig. 14 Wave form when Activating Soft-mute

VCCA

VHOLD

Pin 27 Vcc=12V

RL=8Ω

Po=500mW

fin=3kHz

20msec/div

2V/div

5V/div

Pin 26

VCCA

VHOLD

Pin 27 Vcc=12V

RL=8Ω

Po=500mW

fin=3kHz

2msec/div

2V/div

5V/div

Pin 26

Speaker

Output Speaker

Output

Fig. 15 Wave form on Instantaneous Po wer Interruption

(20msec / div) Fig. 16 Wave form on Instantaneous Power Interruption

(2msec / div)

Speaker

Output

Vcc=12V

RL=8Ω

Po=5W

THD+n=10%

fin=1kHz

R2=91kΩ

R3=22kΩ

200μsec/div

5V/div

Soft Clip

Fig. 17 Wave form on Output Power Limiter function

(Po = 5W)

Technical Note

6/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

8 1012141618

VCC (V)

OUTPUT POWER (W)

THD=10%

RL=6Ω

fin=1kHz

100

0 5 10 15 20 25

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=10V

RL=6Ω

fin=1kHz

100

0 5 10 15 20 25

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=12V

RL=6Ω

fin=1kHz

0 5 10 15 20 25 30 35 40 45 50

TOTAL OUTPUT POWER (W)

ICC (A)

Vcc=10V

Vcc=12V

Vcc=16.5V

RL=6Ω

fin=1kHz

100

0 5 10 15 20 25

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=16.5V

RL=6Ω

fin=1kHz

●Electrical characteristic curves (Refer ence data) – Continued

(2)Under Stereo Operatio n(RL=6)

Fig. 18 Output power - Power supply voltage

Fig. 19 Efficiency - Output power Fig. 20 Efficiency - Output power

Fig. 21 Efficiency - Output power Fig. 22 Current consumption - Output power

Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing

additional heat sinks.

Technical Note

7/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

8 1012141618

VCC (V)

OUTPUT POWER (W)

THD=10%

RL=4Ω

fin=1kHz

100

0 5 10 15 20

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=10V

RL=4Ω

fin=1kHz

100

0 5 10 15 20

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=12V

RL=4Ω

fin=1kHz

100

0 5 10 15 20

OUTPUT POWER (W/ch)

EFFICIENCY (%)

Vcc=16.5V

RL=4Ω

fin=1kHz

0 5 10 15 20 25 30 35 40

TOTAL OUTPUT POWER (W)

ICC (A)

Vcc=10V

Vcc=12V

Vcc=16.5V

RL=4Ω

fin=1kHz

●Electrical characteristic curves (Refer ence data) – Continued

(3) Under Stereo Operation(RL=4Ω)

Fig. 23 Output power - Power supply voltage

Fig. 24 Efficiency - Output power Fig. 25 Efficiency - Output power

Fig. 26 Efficiency - Output power Fig. 27 Current consumption - Output power

Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing

additional heat sinks.

Technical Note

8/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Pin Assignment Top View

IN1

PLM T1

PLM T2

BSP1P

VCCP1P

OUT1P

GNDP1

OUT1N

VCCP1N

BSP1N

WARNING

ERROR

MUTEX

N.C.

IN2

GNDA

FILA

FILP

VCCA

BSP2P

VCCP2P

OUT2P

GNDP2

OUT2N

VCCP2N

BSP2N

VHOLD

ROSC

OSC

VCCP1N

Output DC Voltage Protection

Output Short Protection

DRIVER

1P DRIVER

Power

Limit

Soft M ute

FILP

PW M 1 PW M 2

DRIVER

2P DRIVER

FILA

ERROR

Mute

Control

Under Voltage Protection

High TemperatureProtection Ramp

Generator

Clock

Control

N.C.

Protections & Logic Power-off

Detector

VCCA

GNDA

WARNING

PLM T3

PLM T4

Fig. 28 Pin Assignment Diagram

●Outer Dimensions and Inscriptions

Fig. 29 Outer Dimensions and Inscriptions of HT SSOP-A44 Package

0.8

BD5423

EFS

(MAX 18.85 include BURR)

18.

0.1

Lot No.

TYPE

1PIN MARK

(6.0)

(5.0)

0.85

44 23

1 22

1.0 MAX

(Unit: mm)

Technical Note

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BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Explanation of Pin Functions (Provided pin voltages are typical values.)

No. Symbol Pin voltage Pin description Internal equalizing circuit

44 IN1

IN2 3.5V

ch1 Analog signal input pin

ch2 Analog signal input pin

Input audio signal via a capacitor.

2 PLMT1 3.5V

Voltage-to-current conversion pin for

output power limiter function

Connect a register.

3 PLMT2 -

Current-to-voltage conversion pin for

output power limiter function

Connect a register.

4 PLMT3 -

Current-to-voltage conversion pin for

output power limiter function

Connect a register.

5 PLMT4 3.5V

Bias pin for output power limiter function

Connect a register and a capacitor.

Technical Note

10/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Explanation of Pin Functions (continued)

No. Symbol Pin voltage Pin description Internal equalizing circuit

6 BSP1P - ch1 positive bootstrap pin

Connect a capacitor.

7, 8 VCCP1P Vcc ch1 positive power system power supply pin

9, 10 OUT1P Vcc～0V ch1 positive PW M signal output pin

Connect with output LPF.

11, 12 GNDP1 0V ch1 power system GND pin

13, 14 OUT1N Vcc～0V ch1 negative PWM signal output pin

Connect with output LPF.

15, 16 VCCP1N Vcc ch1 negative power system power supply pin

17 BSP1N - ch1 negative bootstrap pin

Connect a capacitor.

18 WARNING H: 5V

L: 0V

Warnin g output pin

Pin to notify operation warning.

H: Under warning

L: Normal operation

Connect a resister.

19 ERROR H: 5V

L: 0V

Error output pin

A pin for notifying operation errors.

H: Error

L: Normal operation

Connect a resister.

Technical Note

11/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Explanation of Pin Functions (continued)

No. Symbol Pin voltage Pin description Internal equalizing circuit

20 MUTEX -

Audio mute control pin

H: Mute off

L: Mute on

21, 22 N.C. - N.C. pin

Nothing is connected with IC internal circuit.

23 OSC -

Sampling clock signal inp ut/ou tput pin

When using two or more samplin g clocks,

connect via a capacitor.

24 MS -

Master/Slave switching pin

Switching of master/slave functions on a

sampling clock signal.

H: Slave operation

L: Master operation

25 ROSC 5.6V

Internal PWM sampling clock

frequency setting pin

Usually the pin is used open.

To adjust an internal sampling clock

frequency, connect a resister.

26 TM 0～5V Audio muting constant setting pin

Connect a capacitor.

Technical Note

12/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Explanation of Pin Functions (continued)

No. Symbol Pin voltage Pin description Internal equalizing circuit

27 VHOLD 0.68×Vcc

Instantaneous power interruption

detecting voltage setting pin

Connect a capacitor.

To adjust a detecting voltage, connect a

resister.

28 BSP2N - ch2 negative bootstrap pin

Connect a capacitor.

29, 30 VCCP2N Vcc ch2 negative power system power supply pin

31, 32 OUT2N Vcc～0V ch2 negative PWM signal output pin

Connect an output LPF.

33, 34 GNDP2 0V ch2 power system GND pin

35, 36

OUT2P

Vcc～0V ch2 positive PWM signal output pin

Connect an output LPF.

37, 38 VCCP2P Vcc ch2 positive power system power supply pin

39 BSP2P - ch2 positive bootstrap pin

Connect a capacitor.

40 VCCA Vcc Analog system power pin

41 FILP Vcc+35

12 PWM system bias pin

Connect a capacitor.

Technical Note

13/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Explanation of Pin Functions (continued)

No. Symbol Pin voltage Pin description Internal equalizing circuit

42 FILA 3.5V Analog signal system bi as pin

Connect a capacitor.

43 GNDA 0V Analog system power supply pin

Technical Note

14/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Application Circuit Diagram.

・Vcc=10V～16.5V

GNDA VCCA

GNDA

INPUT

VCCP

GNDP

SP ch1

MUTE

WARNING OUTPUT

SLAVE

MASTER

CLK I/O

C26

Output DC Voltage Protection

Output Short Protection

DRIVER

1P DRIVER

Power

Limit

Soft M ute

FILP

PWM 1 PW M 2

DRIVER

2P DRIVER

FILA

ERROR

Mute

Control

Under Voltage Protection

High Temperature Protection Ramp

Generator

Clock

Control

ch-1

L13

C17

C9 C13

N.C.

C10

VCCP

GNDP

SP ch2

C39

L35

L31

C28

C35 C31

C38

C32

C23

INPUT

ch-2

2.2µF C44

C42

C40

C43

C37 C29

C7 C15

GNDD

C41

C27

Protections & Logic

GNDA

R18

ERROR OUTPUT R19

Power-off

Detector

VCCA

GNDA

WARNING

OPEN

2.2µ F

10µ F

0.1µ F

1µ F

10µ F

0.68µ F

10µ F

0.1µ F 0.1µ F

0.22µ F 0.22µ F

1µ F

15µ H

0.68µ F

3.3µ F

0.1µ F

100kΩ

0.68µ F

15µ H

0.22µ F

0.1µ F

0.22µ F

1µ F

15µ H

10µ F

0.1µ F

0.68µ F

22kΩ

0.1µ F

22kΩ

4Ω4Ω

Fig. 30 Circuit diagram under stereo operatio n with 4- load

Technical Note

15/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

Table 1 BOM list for stereo operation with 4- load

No. Item Part Number Vendor Configuration Value Rated

voltage Tolerance Temperature

characteristics Quantity Reference

mm inch

1 IC BD5423AEFS ROHM HTSSOP-A44 - - - - 1 IC1

2 C GRM219B31E684KA88D MURATA 2012 0805 0.68µF 25V ±10% ±10% 4 C6, C17, C28, C39

3 C GRM188R11H104KA93 MURATA 1608 0603 0.1µF 50V ±10% ±10% 5 C7, C15, C29, C37, C40

4 C GRM31MB11H224KA01 MURATA 3216 1206 0.22µF 50V ±10% ±10% 4 C9, C13, C31, C35

5 C 25ST225M3216 Rubycon 3225 1210 2.2µF 25V ±20% ±5% 2 C1, C44

6 C 50ST105M3225 Rubycon 3225 1210 1µF 50V ±20% ±5% 2 C10, C32

7 C GRM21BB31E335KA75 MURATA 2012 0805 3.3µF 25V ±10% ±10% 1 C27

8 C GRM188B11E104KA MURATA 1608 0603 0.1µF 25V ±10% ±10% 3 C5, C23, C26

9 C GRM21BB11C105KA MURATA 2012 0805 1µF 16V ±10% ±10% 1 C41

10 C GRM21BB31C106KE15 MURATA 2012 0805 10µF 16V ±10% ±10% 1 C42

11 C 25SVPD10M SANYO 6666 2626 10µF 25V ±20% ±25% 3 C8, C38, C43

12 R MCR01MZPF2202 ROHM 1005 0402 22k50V ±1% ±200ppm/℃3 R2, R3, R4

13 R MCR01MZPF1003 ROHM 1005 0402 100k50V ±1% ±200ppm/℃2 R18, R19

No. Item Part Number Vendor Configuration Value Tolerance DC

Resistance Rated

DC Current Quantity Reference

14 L 7G09B-150M SAGAMI 10×9×10 15µH×2 ±20% 44mmax. 4.1A max. 2 L9, L13, L31, L35

Technical Note

16/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Notes for use

1. About absolute maximum r atings

If an applied voltage or an operating temperature exceeds an absolute maximum rating, it may cause destruction of a

device. A result of destruction, whether it is short mode or open mode, is not predictable. Therefore, provide a physical

safety measure such as fuse, against a special mode that may violate conditions of absolute maximum ratings.

2. About power supply line

As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between

power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each

property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the

connected power supply do es not have sufficient current absorption capacity, regenerative current wi ll cause the voltage

on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute

maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp

diode between the po wer suppl y and GND pins.

3. Potential of GND (11, 12, 33, 34, and 43 pins)

Potential of the GND terminal must be the lowest under any operating conditions.

4. About thermal design

Perform thermal design with sufficient margins, in consideration of ma ximum po wer dissipation Pd under actual operati ng

conditions. This product has an exposed frame on the bac k of the package, and it is assumed that the frame is used with

measures to improve efficiency of heat dissi pation. In addition to front surf ace of board, p rovide a h eat dissipation pattern

as widely as possible on the back also.

A class-D power amplifier has heat diss ipation efficiency far higher than that of conventional analog power ampl ifier and

generates less heat. However, extra attention must be paid in thermal design so that a power dissipation Pdiss should n ot

exceed the maximum power dissipation Pd.

Maximum power dissipation





Ta-T

Pd aj

jmax

 Tjmax: Maximum temperature junction = 150[℃]

Ta: Operating ambient temper ature [℃]

θja: Package thermal resistance [℃/W]

Po: Output power [W]

η: Efficiency

Power dissipation



W 1-



PP Odiss 















5. About operations in strong electric field

Note that the device may malfunction in a strong electric field.

6. Thermal shutdown (TSD) circuit

This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the outpu t

transistors are placed under open status. The thermal shutdown circuit is primarily intend ed to shut down 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. Accordingly, do not use this circuit function to protect a customer's electrical

appliance.

7. About shorting bet ween pin s and installation failure

Be careful about direction and displacement of an LSI when installing it onto the board. Faulty installation may destroy

the LSI when the device is energized. In addition, a fore ign matter getting in between LSI pins, pins and po wer supply,

and pins and GND may cause shorting and destruction of th e LSI.

8. About power supply startup and sh utdo wn

When starting up a power supply, be sure to place the MUTEX pin (pin 20) at “L” level. When shutting down a power

supply also, be sure to plac e the pin at “L” level. Those processes red uce pop noises generated upon turning on and off

the power supply. In addition, all power supply pins must be started up and shut down at the same time.

9. About WARNING output pin (pin 18) and ERROR output pin (pin 19)

A WARNING flag is output from the WARNING output pin upon operation of the high-temperatur e protection function and

under-voltage protection function. And an E RROR flag is o utput from the ERRO R output pin up on oper ation of VCC/G ND

shorting protection function and spe aker DC voltage applying protection function. These flags are the function which the

condition of this product is shown in. The use which aimed at the protection except for this product is prohibition.

10. About N.C. pins (pins 21 and 22)

The N.C. (Non connection) pins are not connected with an internal circuit. Leave the pins open or connec t them to GND.

Technical Note

17/17

BD5423AEFS

www.rohm.com 2010.05 - Rev.B

●Ordering part number

B D 5 4 2 3 A

E F S -E 2

Part No.

Package

EFS:HTSSOP-44 Packaging and forming specification

E2: Embossed tape and reel

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tape (with dry pack)Tape

Quantity

Direction

of feed

The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand

1500pcs

()

Direction of feed

Reel 1pin

(Unit : mm)

HTSSOP-A44

(5.0)

(6.0)

0.85

9.5±0.2

7.5±0.1

44 23

(MAX 18.85 include BURR)

18.5±0.1

1PIN MARK

0.8

1.0MAX

0.85±0.05

0.08±0.05

0.08

0.37+0.05

0.04

0.08

0.5±0.15

1.0±0.2

0.17+0.05

0.03

4°

6°

−

4°

Datasheet

Notice - GE Rev.002

Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN USA EU CHINA

CLASSⅢ CLASSⅢ CLASSⅡb CLASSⅢ

CLASSⅣ CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which

a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way

responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any

special or extraordinary environments or conditions. If you intend to use our Products under any special or

extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of

product performance, reliability, etc, prior to use, must be necessary:

[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents

[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust

[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,

H2S, NH3, SO2, and NO2

[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves

[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items

[f] Sealing or coating our Products with resin or other coating materials

[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of

flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning

residue after soldering

[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual

ambient temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the

ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Datasheet

Notice - GE Rev.002

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

characteristics of the Products and external components, including transient characteristics, as well as static

characteristics.

2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

responsible for it and you must exercise your own independent verification and judgment in the use of such information

contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses

incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be

applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,

isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

which storage time is exceeding the recommended storage time period.

Precaution for Product Label

QR code printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition

When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act

Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,

please consult with ROHM representative in case of export.

Precaution Regarding Intellectual Property Rights

1. All information and data including but not limited to application example contained in this document is for reference

only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any

other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable

for infringement of any intellectual property rights or other damages arising from use of such information or data.:

2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any

third parties with respect to the information contained in this document.

Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

DatasheetDatasheet

Notice – WE Rev.001

General Precaution

1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.

ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny

ROHM’s Products against warning, caution or note contained in this document.

2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior

notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s

representative.

3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all

information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or

liable for any damages, expenses or losses incurred b y you or third parties resulting from inaccuracy or errors of or

concerning such information.

Datasheet

Part Number bd5423aefs

Package HTSSOP-A44

Unit Quantity 1500

Minimum Package Quantity 1500

Packing Type Taping

Constitution Materials List inquiry

RoHS Yes

bd5423aefs - Web Page

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