Preamplifier + Power Amplifier

for 3V Headphone Stereos

Overview

The LA4581MB is an auto reverse-supported preamplifier +

power amplifier IC that is intended for use in 3V headphone

stereos.

Features

.

Preamplifier muting and preamplifier output on/off can be

implemented with one pin. This IC can easily be used to

construct a set with a radio.

.

The power amplifier needs no input/output coupling

capacitor.

.

A high-frequency cut capacitor is connected to the

preamplifier input pin and the power amplifier input pin.

(Anti-buzz provision)

.

grounding impedance is about 10

Ω. This eliminates the

need for a large capacitor.

.

8

Ω speaker drivable.

Package Dimensions

unit : mm

3112-MFP24S

[LA4581MB]

SANYO : MFP24S

Specifications

Maximum Ratings at Ta=25 °C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

4.5

V

Allowable power dissipation

Pd max

530

mW

Operating temperature

Topr

–20 to +75

°C

Storage temperature

Tstg

–40 to +125

°C

Operating Conditions at Ta=25 °C

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

3.0

V

Operating supply voltage range

1.8 to 3.6

V

Parameter

Symbol

Output

min

typ

max

Unit

[Pre + Power]

Quiescent current

Rg = 2.2 k

17

27

mA

Voltage gain (Closed)

65

68

71

dB

Continued on next page.

Ordering number: EN3535A

Monolithic Linear IC

LA4581MB

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

22896HA(II) No.3535-1/8