LA4820M.PDF

Ordering number: EN5205A

Monolithic Linear IC

LA4820M

Monaural Speaker/Stereo Headphone

Power Amplifier

Overview

The LA4820M compound power IC is designed for portable

information processing equipment, such as electronic book

players and personal notebook computers, and provides on chip

headphone stereo amplifier and monaural speaker amplifier

functions required of such devices. This system IC also

provides on chip a power-saving headphone jack plug-in/out

detection function, which automatically switches the amplifiers,

and an optimum volume level controller.

Package Dimensions

unit : mm

3112-MFP24S

[LA4820M]

Features

c Power-saving headphone jack plug-in/out detection function

on chip that electronically switches between the stereo

headphone amplifier and the monaural BTL amplifier

according to jack plug-in/out.

c The monaural amplifier has, as output control functions, a

built-in output limiter that permits adjustment in accordance

with the speaker impedance and a non-clipping circuit that

outputs a sine wave suited to the output D range, while the

headphone amplifier has a built-in user-friendly PVSS (Peak

Volume Select System).

c On-chip ripple filter with a high ripple rejection ratio in

order to reduce power line noise.

c Less external components needed thanks to system and

circuit technology, and low-capacitance design (22 µF or

less) allowing support for chip components.

12.6

0.15

0.35

1.0

0.8

SANYO : MFP24S

Sanyo recommended board

Functions

c Monaural BTL power amplifier

c Headphone OCL power amplifier (16 W) ´ 2

c Output control functions:

Headphone power PVSS

Monaural power Non-clipping circuit and output

limiter

c Headphone jack plug-in/out detection function

(monaural amplifier/headphone amplifier switching)

c Ripple filter

c Power mute switch

c Common amplifier on/off switching

Independent IC

Ambient temperature, Ta – ° C

Any and all SANYO products described or contained herein do not have specifications that can handle

applications that require extremely high levels of reliability, such as life-support systems, aircraft’s

control systems, or other applications whose failure can be reasonably expected to result in serious

physical and/or material damage. Consult with your SANYO representative nearest you before using

any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other

parameters) listed in products specifications of any and all SANYO products described or contained

herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

22896HA(II) No.5205-1/21

LA4820M

Specifications

Maximum Ratings atTa=25 ° C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

V CC 1,2 max

8.0

Allowable power dissipation

Pd max

580

With Sanyo evaluation board (84.2 ´ 92.6 mm 2 )

1.1

Operating temperature

Topr

–20 to +75

° C

Storage temperature

Tstg

–40 to +150

° C

Operating Conditions atTa=25 ° C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

V CC 1

6.0

Operating voltage range

V CC 1 op

2.5 to 7.2

V CC 2 op

2.0 to 7.2

Operating Characteristics atTa=25 ° C, V CC 1 = 6.0 V, fi = 1 kHz, 0.775 V = 0 dBm,

R L =16

: monaural amplifier, R L =16

: headphone amplifier

Parameter

Symbol

Conditions

min typ max Unit

[Total]

Quiescent current

I CCO 1 Rg=0k

, monaural amplifier

7.0 11.5 21.0 mA

I CCO 2 Rg=0k W , headphone amplifier

5.5 9.0 14.0 mA

I CCO 3 Headphone common amplifier off

4.0 6.3 10.0 mA

Input resistance

10 13 16 k W

[Monaural Amplifier]

Output power

P O 1 THD = 10%, pin 12 connected to GND

500 760

Voltage gain (closed)

VG1 V O = 0 dBm

36.0 39.0 42.0 dB

Total harmonic distortion

THD1 P O = 100 mW

0.1 1.0 %

Output noise voltage

V NO 1 Rg=0

, BPF = 20 to 20 kHz

170 300 µV

Ripple rejection ratio

Rr1 Rg = 0

, Vr = –10 dBm, fr = 100 Hz

60 77

DC offset voltage

V OFF 1 Between pin 19 and pin 21

–80 0 +80 mV

[Non-clipping + Monaural Amplifier]

Output power

P O 2 Vi = 0 dBm

300 450

Total harmonic distortion

THD2 Vi = 0 dBM

1.2 2.0 %

[Output Limiter + Monaural Amplifier]

Output power

P O 3 Vi = 0 dBm, output limiter input resistance 220 W

120 200 300 mW

Total harmonic distortion

THD3 Vi = 0 dBm, output limiter input resistance 220 W

0.5 1.2 %

[Headphone Amplifier]

Output power

P O 4 THD = 10%

30 120

Voltage gain (closed)

VG2 V O = –10 dBm

15.3 18.3 21.3 dB

Total harmonic distortion

THD4 P O = 1 mW

0.1 0.5 %

Interchannel crosstalk

CT VO = –5 dBm, Rg = 0 W

30 39

Output noise voltage

V NO 2 Rg=0

, BPF = 20 to 20 kHz

16 35 µV

Ripple rejection ratio

Rr2 Rg = 0 W , Vr = –10 dBm, fr = 100 Hz

70 92

DC offset voltage

V OFF 2 Between pin 15 and pin 16, and pin 16 and pin 17 –40 0 +40 mV

[PVSS + Headphone Amplifier]

PVSS voltage

V O Vi = –30 dBm, PVSS2

–39 –36 –33 dBm

PVSS distortion factor

THD5 Vi = –30 dBm, PVSS2

0.25 1.6 %

PVSS start input

V OPi PVSS2

–59 –55 –51 dBm

Input width from the starting point to the point

where the output is +4 dB, PVSS ON

PVSS width

W PVSS

28 35

[Ripple Filter]

Output voltage

V RF I RF = 300 mA, 2SB1295 h FE 6 used

5.30 5.49 5.70 V

Ripple rejection ratio

Rr3

Vr = –10 dBm, fr = 100 Hz, I RF = 300 mA,

2SB1295 h FE 6 used

30 34

No.5205-2/21

LA4820M

Block Diagram

No.5205-3/21

LA4820M

Test Circuit Diagram

No.5205-4/21

LA4820M

Sample Application Circuit 1

*1 A Tantalum capacitor is recommended.

*2 A polyester film or ceramic capacitor (of which capacitance specified must be independent of temperature changes) is

recommended.

No.5205-5/21

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