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Ordering number : EN4090C

Monolithic Linear IC

LA4450
Two Channel Power IC for Bus or Track
Use in TV and Home Audio Applications

Overview

Package Dimensions

The LA4450 is a single package two channel power IC
that supports an operating voltage of 26 V. It is particularly well suited for use as the bus or track power IC in
car stereo applications. Additionally, since the LA4450
can drive 4 Ohm loads, it can be used effectively in highpower high-end products. Furthermore, since it supports a
high operating voltage and has low distortion, it is also
optimal for use in TV and home audio products.

unit: mm
3023A-SIP14H
[LA4450]

Functions
o
o
o
o

Standby switch (active on high (+5 V) input)
On-chip impulse noise protection circuit
On-chip thermal protection circuit
On-chip overvoltage and surge protection circuits

SANYO: SIP-14H

Features
o
o
o
o
o
o

Two channels in a single package
PO = 12 W × 2 (VCC = 26.4 V, RL = 8 Ohm, THD = 10%)
PO = 20 W × 2 (VCC = 26.4 V, RL = 4 Ohm, THD = 10%)
Can drive 4 Ohm speakers
Built-in standby switch
Minimizes impulse noises

Specifications
Maximum Ratings at Ta = 25°C
Parameter

Symbol

Maximum supply voltage

VCC max

Maximum output current

Pd max*

Ratings

Unit

IO peak

Allowable power dissipation

Conditions
Rg = 0 (no signal)

37

Infinite heat sink

V

4

A

25

W

Operating temperature

Topr

-35 to +80

°C

Storage temperature

Tstg

-40 to +150

°C

Ratings

Unit

Note: * Set VCC and RL within ranges that do not cause Pd max to exceed 25 W.
(When VCC is 37 V, RL should be 6 Ohm or larger and when VCC is 35 V, RL should be 4 Ohm or larger.)

Operating Conditions at Ta = 25°C
Parameter

Symbol

Recommended supply voltage

VCC

Recommended load resistance

RL

Operating supply voltage range

VCCop

Conditions

26.4

V

8

Ohm

10 to 30

V

SANYO
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
43098HA (OT)/10794TS B8-0618/1102 No. 4090-1/7

LA4450

Operating Characteristics at Ta = 25°C, VCC = 26.4 V, RL = 8 Ohm, f = 1 kHz, Rg = 600 Ohm
Ratings
Parameter
Standby current
Quiescent current
Output power
Voltage gain

Symbol
Ist

Conditions

min

typ

Standby switch off
Rg = 0

50
10

PO1

THD = 10%
THD = 10%, RL = 4 Ohm

VG

VO = 0 dBm

30

uA

80

140

mA

49

12

W

20

W

THD

Output noise voltage

VNO

Rg = 0, BPF-BW = 20 Hz to 20 kHz

53
0.4

%

0.4

PO = 1 W

51
0.07

Total harmonic distortion

1.0

mV

Ripple exclusion ratio

SVRR

Rg = 0, fR = 100 Hz, VR = 0 dBm

45

55

Channel separation

CHsep

VO = 0 dBm, Rg = 10 kOhm

45

55

With a 10 kOhm resistor connected at pin 12

2.5

Standby control voltage

Vst

dB

dB
dB
VCC

V

?f - Sf

Pd max - Ta

Heat sink thermal resistance, ?f - °C/W

Allowable power dissipation, Pdmax - W

Unit

1

ICCO
PO2

max

Ambient temperature, Ta - °C

Heat sink surface area, Sf - cm2

No. 4090-2/7

LA4450

Test Circuit

Unit (resistance : Ohm, capacitance : F)

1. Features and Usage Notes
o Pin 12 is the standby pin. The IC operates when a voltage of 2 V or higher is applied through the external resistor
R1. Note that the maximum influx current to pin 12 is 500 uA.
o Changing the voltage gain

The voltage gain VG can be lowered by connecting an external resistor in series between the NF pin (pins 8 and
14) and CNF.
VG = 20 log

30 kOhm
75 + RNf'

However, since the IC may oscillate if VG is 30 dB or lower, use a VG of 36 dB or higher.
o The LA4450 includes a thermal protection circuit to prevent damage to or destruction of the IC due to abnormal
overheating. As a result, the output may be attenuated or cut off if the application heat sinking is inadequate.
o The LA4450 includes an overvoltage protection circuit to protect the IC against power supply surges and abnormal
voltages. This circuit has hysteresis characteristics: it operates at between 39 and 40 V, and recovers at around 34 V.
o Although the LA4450 includes a current limiter circuit to prevent damage due to abnormal currents, care must still
be exercised to prevent load shorts and other excessive current conditions.
No. 4090-3/7

LA4450

Sample Application Circuit

Unit (resistance : Ohm, capacitance : F)

No. 4090-4/7

LA4450

Printed Circuit Board Pattern Example

C opper foiled side
90 × 100 mm2

PO - VCC

Output power, PO - W

Output power, PO - W

PO - VCC

THD - PO

THD - PO

Total harmonic distortion, THD - %

Supply voltage, VCC - V

Total harmonic distortion, THD - %

Supply voltage, VCC - V

Output power, PO - W

Output power, PO - W
No. 4090-5/7

LA4450

No. 4090-6/7

LA4450

s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
ΠAccept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s 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 April, 1998. Specifications and information herein are subject to change
without notice.
No. 4090-7/7


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