Rohm BD7836EFV Technisches Datenblatt

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www.rohm.com 2010.07 - Rev.

Class-AB Speaker Amplifiers

1.9W+1.9W

Stereo Speaker Amplifier

BD7836EFV

●Description

BD7836EFV is a Class-AB stereo speaker amplifier, developed for note-book PC, desktop PC, portable devices and others.

Class-AB amplifier has no EMI noise. Power package HTSSOP-B20 can realize high output power.

Low circuit current at active mode reduce consumption of battery. Shutdown current is 0.1µA typically, and pop noise level

when shutdown turns on and off is very small. This device is suitable for the application that often changes mode between

“shutdown state” and “active state”.

●Features

1) High power 1.9W typ. (VDD=5V, RL=4Ω, THD+N=1%, stereo input)

High power 1.2W typ. (VDD=5V, RL=8Ω, THD+N=1%, stereo input)

2) Gain selectable by the external control (6,10,15.6,21.6dB)

3) Pop noise suppression circuitry

4) Shutdown function (also Mute function) [Isd=0.1µA(typ.)]

5) Protection circuitry (Thermal shutdown, Under voltage lockout)

6) Power Package with thermal pad HTSSOP-B20

●Applications

Note-book PC, Desktop PC, etc.

●Absolute maximum ratings (Ta=+25℃)

Parameter Symbol Ratings Unit

Power Supply Voltage VDDmax 7.0 V

Power Dissipation Pd 1 *1 W

3.2

*2 W

Storage Temperature Tstg -55 ～+150 ℃

Input Terminal Input Voltage Range *3 Vin -0.3～VDD+0.3 V

Control Terminal Input Voltage Range *4 Vctl -0.3～VDD+0.3 V

*1 70mm×70mm×1.6mm FR4 1-layer glass epoxy board(Copper on top layer 0%)

Derating in done at 8mW/℃for operating above Ta=25℃. There are thermal via on the board.

*2 70mm×70mm×1.6mm FR4 4-layer glass epoxy board (Copper on bottom 2 and 3 layer 100%)

Derating in done at 25.6mW/℃for operating above Ta=25℃. There are thermal via on the board.

*3 Input Terminal (LIN+, LIN-, RIN+, RIN-)

*4 Control Terminal ( SHUTDOWN , GAIN0, GAIN1)

●Operating conditions

Parameter Symbol Range Unit

Power Supply Voltage VDD +4.5 ～+5.5 V

Temperature Topr -40 ～+85 ℃

* These products aren’t designed for protection against radioactive rays.

No.10077EAT07

Technical Note

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BD7836EFV

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●Electric characteristic (Unless otherwise specified, Ta=+25℃, VDD=+5.0V, RL=8Ω, AC stereo input)

Parameter Symbol Limits Unit Condition

Min. Typ. Max.

Circuit current (Active) Icc ―5 10 mA

IC active, No load

SHUTDOWN =Hi

Circuit current (Shutdown) Isd ―0.1 2.0 µA

IC Shutdown

SHUTDOWN =Lo

Output power 1 PO1 0.7 1.2 ―W RL=8Ω, BTL, f=1kHz, THD+N=1% *1

Output power 2 PO2 ―1.9 ―W RL=4Ω, BTL, f=1kHz, THD+N=1% *1

Gain GV

5.5 6.0 6.5 dB BTL, GAIN0=GAIN1=L

9.5 10 10.5 dB BTL, GAIN0=L, GAIN1=H

14.6 15.6 16.5 dB BTL, GAIN0=H, GAIN1=L

20.6 21.6 22.6 dB BTL, GAIN0=GAIN1=H

Input resistance RIN

63 90 117 kΩGAIN0=GAIN1=L

49 70 91 kΩGAIN0=L, GAIN1=H

31 45 59 kΩGAIN0=H, GAIN1=L

17 25 33 kΩGAIN0=GAIN1=H

Supply ripple rejection ratio PSRR 62 68 ―dB Vripple=0.2Vp-p,CBYP=0.47µF

f=1kHz, BTL

Output noise Vnoise ―16 80 µVrms BTL, f=1kHz, 20-20kHz

S/N SN―105 ―dB BTL, Po=1W, BTL, f=1kHz, 20-20kHz

Output DC offset voltage ⊿Vo ―0 ±25 mV

Control terminal

Input voltage Hi level VIH 2.0 ―VDD V

Lo level VIL 0 ―0.8 V

*1: B.W.=400～30kHz，BTL：The voltage between 4pin and 8pin, 14pin and 18pin.

●Control terminal’s settings

SHUTDOWN IC condition

Hi Active

Lo Shutdown

GAIN0 GAIN1 Gain Input resistance

Lo Lo 6dB 90kΩ(TYP.)

Lo Hi 10dB 70kΩ(TYP.)

Hi Lo 15.6dB 45kΩ(TYP.)

Hi Hi 21.6dB 25kΩ(TYP.)

Technical Note

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BD7836EFV

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Lot No.

(unit : mm)

BD7836

●Package outlines

Fig.1 HTSSOP-B20

●Block diagram ●Pin assignment table

No. Terminal name Function

1 GND Ground

2 GAIN0 Bit 0 of gain select

3 GAIN1 Bit 1 of gain select

4 LOUT+ Left channel positive output

5 LIN- Left channel negative differential input

6 PVDD Supply voltage terminal

7 RIN+ Right channel negative differential input

8 LOUT- Left channel negative output

9 LIN+ Left channel positive differential input

10 BYPASS Tap to voltage divider for internal

midsupply bias generator

11 GND Ground

12 NC No connection

13 GND Ground

14 ROUT- Right channel negative output

15 PVDD Supply voltage terminal

16 VDD Supply voltage terminal

17 RIN- Right channel negative differential input

18 ROUT+ Right channel positive output

19 SHUTDOWN Places IC in shutdown mode when

held low

20 GND Ground

Power

Management

Depop

Circuitry

Gain

Control

RIN-

RIN+

ROUT+

ROUT-

GAIN0

GAIN1

PVDD

VDD

BYPASS

GND

SHUTDOWN

LIN+

LIN-

LOUT-

LOUT+

Fig.2

Technical Note

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BD7836EFV

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●Measurement circuit diagram

Fig.3

Gain

Control

Power

Management

ROUT+ 18

ROUT- 14

RIN-

RIN+

GAIN0

GAIN1

LIN-

LIN+

Right

Line

Input

Signal

CRIN-

0.47µＦ

CRIN+

0.47µＦ7

6.15

VDD

BYPASS

SHUT-

DOWN

GND To

System Control

CSR

0.47µＦ

CBYP

0.1µＦ

CSR

1,11,

13,20

LOUT+

LOUT-

Left

Line

Input

Signal

CLIN-

CLIN+

0.47µＦ

VDD

PVDD

Technical Note

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BD7836EFV

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●Application circuit example

Fig.4 Single Ended inputs

Fig.5 Differential inputs

Gain

Control

Power

Management

ROUT+ 18

ROUT- 14

RIN-

RIN+

GAIN0

GAIN1

LIN-

LIN+

Right

Line

Input

Signal CRIN-

0.47µＦ

CRIN+

0.47µＦ7

6.15

VDD

BYPASS

SHUT-

DOWN

GND ToSystem Control

CSR

0.47µＦ

CBYP

0.1µＦ

CSR

1,11,

13,20

LOUT+

LOUT-

Left

Line

Input

Signal CLIN-

CLIN+

0.47µＦ

VDD

PVDD

Gain

Control

Power

Management

ROUT+ 18

ROUT- 14

RIN-

RIN+

GAIN0

GAIN1

LIN-

LIN+

Right

Line

Input

Signal CRIN-

0.47µＦ17

CRIN+

0.47µＦ7

6.15

VDD

BYPASS

SHUT-

DOWN

GND ToSystem Control

CSR

0.47µＦ

CBYP

0.1µＦ

CSR

1,11,

13,20

LOUT+

LOUT-

Left

Line

Input

Signal CLIN-

CLIN+

0.47µＦ

VDD

PVDD

Technical Note

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BD7836EFV

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●Evaluation board circuit diagram

Fig .6

●Evaluation board partts list

Number Part name Type, Value SMD size Manufacturer/

Part number

4 CLIN+/-,CRIN+/- Capacitor, 0.47μF 1608 Murata

GRM188R71C474KA01D

2 CSR Capacitor, 0.1μF 1608 Murata

GRM188R71C104KA01D

1 CBYP Capacitor, 0.47μF 1608 Murata

GRM188R71C474KA01D

1 U1 IC, BD7836EFV,

Class-AB stereo speaker Amplifier PKG:HTSSOP-B20 ROHM

BD7836EFV-E2

1 PCB1 Printed-circuit board

BD7836EFV ――

Please connect to GND.

Please connect to

Power Supply

(VDD=+4.5～5.5V) line.

Please connect ito

input signal line.

Please connect speaker.

Use these solder jumper

for connecting the control

terminal to GND.

Use these solder jumper

for connecting the control

terminal to VDD.

Gain

Control

Power

Management

ROUT+ 18

ROUT- 14

RIN-

RIN+

GAIN0

GAIN1

LIN-

LIN+

CRIN-

0.47μＦ

CRIN+

0.47μＦ 7

6.15

VDD

BYPASS

SHUT-

DOWN

GND

CSR

0.47μＦ

CBYP

0.1μＦ

CSR

1,11,

13,20

LOUT+

LOUT-

CLIN-

CLIN+

0.47μＦ

PVDD

Technical Note

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BD7836EFV

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●Description of external parts

①Input coupling capacitors Ci (CLIN+/-,CRIN+/-)

It sets cutoff frequency fc by the following formula by input coupling capacitors Ci(CLIN+/-,CRIN+/-) and input impedance Zi.

It makes an input coupling capacitors of evaluation board 0.47μF on evaluation board..

Input impedance Zi and cutoff frequency fc in each gain settings are given in Table1.

Table1. The relations in the gain settings and cutoff frequency fc.

GAIN0 GAIN1 Gain [dB] Ri Ω] Zi [Ω] fc [Hz]

Lo Lo 6 90k 45k 7.5

Lo Hi 12 70k 35k 9.7

Hi Lo 18 45k 22.5k 15

Hi Hi 24 25k 12.5k 27

②The power decoupling capacitors (CSR)

It makes a power decoupling capacitors 0.1μF. Because power decoupling capacitors influences total harmonic distortion

(THD) and some audio characteristics, please place a good low equivalent-series-resistance (ESR) capacitors as close

as possible to IC.

③BYPASS capacitor (CBYP)

Because BYPASS capacitor influences THD, PSRR and some audio characteristics, please place good low

equivalent-series-resistance (ESR) capacitor as close as possible to IC.

The value of BYPASS capacitor determines the turn on time and turn off time.

Refer to the following section of “Turn ON and Turn OFF”.

It makes BYPASS capacitor of evaluation board 0.47μF.

④Control terminal

Each control terminal (SHUTDOWN , GAIN0, GAIN1) don’t have pull-down resistance internal circuit.

Connect to GND line or VDD line or input Low or high level voltage to terminals in order to avoid the terminals

made high Impedance.

Using IC under the control terminal let high impedance, operation fault may occur.

[Hz]

CiiZ2π

fc 



Technical Note

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BD7836EFV

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●Evaluation board PCB layer

Fig.7 Top layer

Fig.8 Bottom Layer

Technical Note

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BD7836EFV

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●Turn on and Turn off

This IC has the circuit that reduces pop noise at “turn on” and “turn off”.

Reducing pop noise is realized in controlling to adjust the turn on and turn off time.

(a)TurnON (b)TurnOFF

Fig. 9

The following table show the Turn ON time and Turn OFF time when It makes the BYPASS capacitor 0.47uF.

CBYP Turn ON Turn OFF

0.47uF 280ms 340ms

Turn ON time is defined as the time until BYPASS terminal voltage reaches the 90% of VDD/2 after SHUTDOWN L→H.

Turn OFF time is defined as the time until BYPASS terminal voltage reaches the 10% of VDD/2 after SHUTDOWN H→L.

The values of above table are typical characteristics. These values will shift by 30% at some conditions.

●Input terminal

This IC can be inputed signal by differntial inputs or single ended inputs.

When sing the single ended inputs, connect the terminal of not signal inputed line to AC GND with input couppling

capacitors.

Please makes the value of all input capacitors same because of preventing pop noise.

If they are not same value, for example, LOUT+=0.47µF, LOUT-=0.33µF, it caused pop noise increase and characteristics

become worse.

SHUTDOWN

5V/div.

BYPASS

1V/div.

LOUT-

1V/div.

Turn ON time Turn OFF time

Technical Note

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BD7836EFV

www.rohm.com 2010.07 - Rev.

●About the thermal design by the IC

Characteristics of an IC have a great deal to do with the temperature at which it is used, and exceeding absolute maximum

ratings may degrade and destroy elements. Careful consideration must be given to the heat of the IC from the two

standpoints of immediate damage and long-term reliability of operation. Pay attention to points such as the following.

Since an maximum junction temperature (TjMAX.)or operating temperature range (Topr) is shown in the absolute maximum

ratings of the IC, to reference the value, find it using the Pd-Ta characteristic (temperature derating curve).

If an input signal is too great when there is insufficient radiation, TSD (thermal shutdown) may operate.

TSD, which operates at a chip temperature of approximately +180℃, is canceled when this goes below approximately

+100℃.

Since TSD operates persistently with the purpose of preventing chip damage, be aware that long-term use in the vicinity

that TSD affects decrease IC reliability.

Temperature Derating Curve

Fig.10 Power dissipation vs. Ambient temperature

Power dissipation values vary according to the board on which the IC is mounted. The Power dissipation of this IC when

mounted on a multilayer board designed to radiate is greater than the values in the graph above.

Note) Values are actual measurements and are not guaranteed.

Reference Data

HTSSOP-B20

2.5

2.0

1.0

0.5

0.0 0 25 50 75 100 125

150

Ambient Temperature Ta(℃)

Power dissipation Pd(W)

①1W

Measurement conditions: IC unit Rohm standard board mounted

Board ：70mm×70mm×1.6mmt

board①FR4 1-layer glass epoxy board (Copper on top layer 0%)

board②FR4 2-layer glass epoxy board (Copper on top layer 0%)

board③FR4 3-layer glass epoxy board (Copper on top layer 100%)

board④FR4 4-layer glass epoxy board (Copper on top layer 100%)

1.5

2.3 ③2.3W

3.5

3.2 ④3.2W

②1.45W

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