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PDF LA4581MB Data sheet ( Hoja de datos )
| Número de pieza | LA4581MB | |
| Descripción | Preamplifier Power Amplifier for 3V Headphone Stereos | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number: EN3535A
Monolithic Linear IC
LA4581MB
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)
Because Vref AMP (r0 = 10 Ω) is built in, the virtual
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
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Operating Conditions at Ta = 25 °C
Conditions
Ratings
4.5
530
–20 to +75
–40 to +125
Unit
V
mW
°C
°C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCC op
Conditions
Ratings
3.0
1.8 to 3.6
Unit
V
V
Operating Characteristics at Ta = 25 °C, VCC = 3.0 V, f = 1 kHz, 0.775 V = 0 dBm,
RL = 10 kΩ (preamplifier), RL = 16 Ω (power amplifier)
Parameter
[Pre + Power]
Quiescent current
Voltage gain (Closed)
Symbol
Output
ICCO
VGT
Rg = 2.2 kΩ (preamplifer) VIN = 0 V
VO = –5 dBm
min typ max Unit
17 27 mA
65 68 71 dB
Continued on next page.
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
1 page  
LA4581MB
IC Usage Notes
1. The power amplifier outputs and the common amplifier output are connected through resistors of about 60 Ω. The resistors
are for common amplifier oscillation blocking.
Ω
Ω
2. The preamplifier muting function isolates the preamplifier outputs from SW OUT. The preamplifier is on even when the
preamplifier muting is on.
3. If transient noise is noticeable when the power supply is turned off, add the external circuit described below. Transient noise
when the power is turned off can be improved by rapidly applying the power amplifier muting.
Unit (resistance: Ω, capacitance: F)
4. Internal equivalent circuit for each SW pin.
. Pre-mute
However, the standby current IST flows even when the
power switch is off
IST = (VCC − VBE)/600 kΩ
When VCC = 3.0 V
IST = (3.0 − 0.6)/600 kΩ 7 4 µA
.Power mute
Unit (resistance: Ω)
MUTE ON condition : V8IN ^ VCC – 0.2 V
Inflow current : I8 7 60 µA (when VCC = 3.0 V)
.F/R SW
Unit (resistance: Ω, capacitance: F)
MUTE ON condition : V16 % 0.3 V
Outflow current : I16 7 2.5 µA
REV condition : V17 % 0.2 V
Unit (resistance: Ω, capacitance: F)
No.3535-5/8
5 Page | ||
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