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

Test Circuit

Sample Application Circuit (1)

LA3550M+LA4538M

LA3550M

Sample Application Circuit (2)

When using with the VCC=3V set, lower the power supply voltage to less than 1.7V as shown in the figure below.

No.2871–3/4

LA3550M

Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.

Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.

Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.

This catalog provides information as of February, 2000. Specifications and information herein are subject
to change without notice.

PS No.2871–4/4