Sanyo LA3550M Specifications

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.

Monolithic Linear IC

Auto-Loudness Controller

for Headphone Stereo Systems

Ordering number:ENN2871B

LA3550M

SANYO Electric Co.,Ltd. Semiconductor Company

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

Overview

The LA3550M Auto-Loudness Controller IC pro vides user­selectable boosting of up to approximately 24dB for low­frequency sound components in the range of 30 to 50Hz.
Boosting gain for low frequencies can be controlled in pro­portion to the level of an external input signal. High fre­quencies are also boosted by a fixed 6dB. The result gives
natural and dynamic boosting at all sound levels, and real­istic audio reproduction.
The LA3550M operates on a 1.5V power supply and boosts
a super bass adopting the external CR circuit. The boosting
feature can be selected “ON/OFF” by means of an elec­tronic switch on the chip.

Features

• User-selectable low-frequency boost levels from 5.5 to

23.5dB (max).

• 6dB (fixed) high-frequency boosting.

• Low-frequency boost gain level control circuit on-chip.

• Output signal detection circuit on-chip.

• Boost select/deselect switching.

• Built-in AGC circuit prevents clipping.

• Reduced noise levels.

• Reduced parts’ count.

• Low-power operation.

• 14-pin MFP package (1mm pitch pins).

Package Dimensions

unit:mm

3111-MFP14S

[LA3550M]

14

1

8.0

0.35

8

7

1.0

0.625

4.4

0.15

1.8max

1.50.1

1.0

SANYO : MFP14S

5.15

6.4

Specifications

Absolute Maximum Ratings at Ta = 25˚C

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egatloVylppuSmumixaMV

noitapissiDrewoPelbawollAxamdP 051Wm

erutarepmeTgnitarepOrpoT 57+ot02–

erutarepmeTegarotSgtsT 521+ot04–

xamtnecseiuQ 5.4V

CC

21000TH (KT)/7102TS/4041TS/9018YT/2168TA, TA No.2871–1/4

˚C
˚C

Operating Conditions at Ta = 25˚C

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egatloVylppuSdednemmoceRV

egnaRegatloVgnitarepOV

ecnatsiseRdaoLdednemmoceRR

LA3550M

CC
CC

L

5.1V

0.3ot9.0V
01kΩ

Operating Characteristics at Ta = 25˚C, Rg=600Ω, RL=10kΩ, f

retemaraPlobmySsnoitidnoC

tnerruCtnecseiuQ

niaGegatloV

tsooB*

egatloVtuptuOoVVNIV,mBd81–=

noitrotsiDcinomraHlatoTDHTV,mBd02–=oV

klatssorCTCV,0=gR,mBd02–=oV

egatloVesioNtuptuOV

noitcejeRelppiRRRVS

1occIV,tnecseiuQ

2occIV,tnecseiuQ
1GVV
2GVV

ON

CC
CC

1tsooBV
2tsooBV
3tsooBV

TED
TED
TED

CC

TED

V,mBd03–=

CC

V,mBd51–=

CC

V,mBd01–=

CC

CC

CC

f,0=gR

R

NOtsooB

V,zH001=

R

Note ) *VG2 → 0dB

Equivalent Circuit Block Diagram

=1kHz, See specified Test Circuit.

DET

sgnitaR

nimpytxam

FFOtsooB,V5.1=4.10.2Am

V,mBd01–=

CC

FFOtsooB,zHk1=f,V1.1=2.3–7.1–2.0–Bd

NOtsooB,zHk1=f,V1.1=2.3–7.1–2.0–Bd

CC

V,zHk02otzH02=F.P.B,0=gR

CC

V,mBd03–=

CC

NOtsooB,V5.1=1.20.3Am

NOtsooB,zH05=f,V1.1=0.125.320.62Bd
NOtsooB,zH05=f,V1.1=0.015.210.51Bd
NOtsooB,zH05=f,V1.1=0.35.50.8Bd

NOtsooB,zH05=f,V5.1=021071022Vm

NOtsooB,zHk1=f,V1.1=1.00.1%

NOtsooB,zHk1=f,V1.1=62Bd

FFOtsooB,V5.1=5.35.5Vµ

,V0.1=

0282Bd

tinU

No.2871–2/4