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Class-AB Speaker Amplifiers
1.1W to1.5W Monaural Speaker Amplifiers
BH7824FVM,BH7826FVM
No.10077EAT04
Description The BH7824FVM and BH7826FVM are speaker amplifier ICs for low-voltage drives and low power consumption audio, specialized for mobile telephones and other mobile audio devices. Features 1) BTL monaural speaker amplifier 2) Capable of high power 500mW/8/BTL output 3) Wide power supply voltage range 4) Supports active/shutdown modes 5) Built-in anti-pop circuit 6) Built-in thermal shutdown circuit Applications Mobile telephones, PDAs, notebook computers, DSC, DVC, and other mobile audio devices. Product lineup Part No. Input type Supply voltage(V) BH7824FVM Unbalanced input 2.4 ~ 5.5 BH7826FVM Balanced input 2.6 ~ 5.5
Absolute maximum ratings(Ta=25) Parameter Supply voltage Power dissipation Operating temperature Storage temperature
*1 *2
Symbol VCCmax. Pd Topr Tstg
Limits 6.0 470(*1) -30 ~ +85(*2) -55 ~ +125
Unit V mW
Reduced by 4.7 mW/C at 25C or higher, when mounted on a 70mmx70mmx1.6mm PCB board. Topr=70 ~ 85 is the range for performing basic operations and does not guarantee characteristics or rated output. Moreover, TSD (Thermal Shutdown) may become operable if input signals occurring in this range are excessive.
500 Power dissipation Pd[mW] 400 300 200 100 0 0 50 100 150 Temperature Ta[]
Fig.1 Ta-Pd (when mounted on a PCB board)
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1/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Operating conditions Parameter Supply voltage (Ta=25) Ratings BH7824FVM 2.4V ~ 5.5V BH7826FVM 2.6 ~ 5.5
Technical Note
* Note: This IC is not designed to be radiation-resistant.
Electrical characteristics Parameter Circuit current 1 Circuit current 2 Voltage gain 1 Voltage gain 2
(Unless otherwise noted Ta=25, Vcc=3.6V, f=1kHz, RL=8) Limits(Typ.) Symbol Unit BA7824FVM BA7826FVM ICC1 ICC2 GV1 GV2 VOM1 VOM2 DSTN VNO GS VBIAS VSH1 VSH2 3.5 0 +11.5 0 +6.0 0.07 -94 -107 1.8 VCCx0.8 ~ VCC 0 ~ 0.5 3.5 0 +11.5 +6.0 +5.1 0.2 -94 -107 1.8 2.0 ~ VCC 0 ~ 0.5 mA A dB dB dBV dBV % dBV dBV V V V
Conditions
No signal , Active mode No signal, Suspend mode VIN=-20dBV,1st Op-amp gain 2nd Op-amp gain DSTN=1% ,BTL *1 VCC=3.4V,DSTN=1%,BTL *1 VIN=-20dB,V SE *1 No signal, SE Active mode *2 VIN=-20dB,V BTL *2 3pin DC voltage Active mode, Hold voltage Suspend mode, Hold voltage
Maximum output voltage1 Maximum output voltage2 Output distortion Output noise level Suspend attenuation Bias setting voltage Suspend hold voltage / H Suspend hold voltage / L
*1 : B.W.=0.4 ~ 30kHz *2 : DIN AUDIO
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2/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Measurement circuit
Technical Note
1 A/S 2 3 4 600 22k
100k
BIAS
8 7 6 5 8
V
0.1 1.0
0.1
V
0.1
100
Fig.2 BH7824FVM
100k VIN2 0.1 22k 1 600 2 A/S
3
BIAS
8 7 6 5 100k 8
100
V
0.1 VCC
VIN1
0.1
1 22k 4
V
600
Fig.3 BH7826FVM
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3/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Block diagram
Technical Note
SUSPEND CTRL 1
A/S
8 SP OUT 2
BIAS OUT 2
7 GND
BIAS IN
3 4
BIAS
6
VCC
SP IN
5 SP OUT 1
Fig.4 BH7824FVM
SP IN 2 1
8 SP OUT 2 7 GND
BIAS
SUSPEND CTRL 2 A/S
BIAS
3
6 VCC 5 SP OUT 1
SP IN 1 4
Fig.5 BH7826FVM
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4/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Equivalent circuit
Technical Note
Pin No.
BH7824FVM Pin name Equivalent circuit Pin name
BH7826FVM Equivalent circuit
1
SUSPEND CTRL
01
50k 50k
1k
SUSPEND CTRL
01
100k
2
BIAS OUT
30k 487k 30k
02
BIAS OUT
02
100k
3
BIAS IN
30k 57k 30k
03
BIAS IN
30k 150k 30k
03
4
SP IN
1k
04
SP IN
1k
04
5
SP OUT1
05
SP OUT1
05
6
VCC
VCC
7
GND
GND
8
SP OUT2
08
SP OUT2
08
Note: Numerical values in figures are design values, and do not guarantee ratings.
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5/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Application circuit
Technical Note
BH7824FVM
Co SUSPEND 01 A/S 02 03 04 R1 R2
BIAS
08 07 SPEAKER 06 05
SP_IN(L+R)
Co
Cf
Fig.6
BH7826FVM
Cf
R2 SP_IN
0.1 R1
01 08 07 1 03
BIAS
SUSPEN 1
02
SPEAKER
06 05
SP_IN
0.1
04 R1 R2
Cf
Fig.7
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6/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Cautions for use
Technical Note
1) Set within the ranges below. Parameter R1 R2 Cf Co fcutoff 8, 12speaker BH7824FVM/26FVM 10k R1 120k 47k R1 120k Cf560pF (G+6dB) Cf270pF(0G+6dB) Co 100pF fcutoff 4kHz fcutoff = 1/(2R2Cf ) [Hz] 16speaker BH7824FVM

Co 47pF
2) Do not use this IC without a load. 3) Do not connect a capacitive load greater than 100 pF between an output pin (pin 5 or 8) and GND. Because of the multiple feedback configurations, if a large capacitive load were connected, the amplifier might oscillate. 4) This IC is compatible with dynamic speaker loads (8/12/16: BH7824FVM, 8/12: BH7826FVM) and is not compatible with loads other than these mentioned. 5) A soft mute setting becomes effective on connecting a resistor and capacitor to the SUSPEND pin (1pin: BH7824FVM, 2pin: BH7826FVM). VCC
R C
1
Recommend R:100k C:0.47F
Fig.8 BH7824FVM Soft mute
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7/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Reference data
14 CIRCUIT CURRENT : ICCA[mA]
Technical Note
4.5 CIRCUIT CURRENT : ICCS[uA] 4
13
12 10 8 6 4 2 0 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE : VCC[V]
3 2.5 2 1.5 1 0.5 0 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE : VCC[V]
VOLTAGE GAIN : Gv[dB]
3.5
12
11
10
9
8 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 SUPPLY VOLTAGE : VCC[V]
Fig.9 Circuit current (ACTIVE) vs Supply voltage
Fig.10 Circuit current (SUSPEND) vs Supply voltage
Fig.11 Voltage gain vs Supply voltage
TOTAL HARMONIC DISTORTION : THD[%]
1
0.1
0.01 0 2 4 6 8 SUPPLY VOLTAGE : VCC[V]
Fig.12 Total harmonic distortion vs Supply voltage
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8/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Notes for use
Technical Note
1) Numbers and data in entries are representative design values and are not guaranteed values of the items. 2) Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for sufficient margins when determining circuit constants. 3) Absolute maximum ratings Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr), may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at times where the absolute maximum ratings may be exceeded. 4) GND potential Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at any time, regardless of whether it is a transient signal or not. 5) Thermal design Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in actual states of use. 6) Short circuit between terminals and erroneous mounting Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other components on the circuits, can damage the IC. 7) Operation in strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction.
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9/10
2010.06 - Rev.A
BH7824FVM,BH7826FVM
Ordering part number
Technical Note
B
Part No.
H
7
Part No. 7824 7826
8
2
4
F
V
M
-
T
R
Package FVM: MSOP8
Packaging and forming specification TR: Embossed tape and reel
MSOP8

2.90.1 (MAX 3.25 include BURR)
8765
Tape
0.290.15 0.60.2
Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
+6 4 -4
Quantity Direction of feed
4.00.2
2.80.1
( reel on the left hand and you pull out the tape on the right hand
1pin
)
1 234
1PIN MARK 0.475
0.9MAX
+0.05 0.145 -0.03 S
0.750.05
0.080.05
+0.05 0.22 -0.04 0.08 S 0.65
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
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10/10
2010.06 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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http://www.rohm.com/contact/
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R1010A

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