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Ordering number: EN4087C
Monolithic Linear IC
LA4598
Two-channel Power Amplifier for Radio Cassette
Players (No Heat Sink Needed during 9 V Operation)
Overview
The LA4598 is a two-channel power IC that is intended for
use in portable audio equipment. Needing no heat sink during
9 V operation facilitates set design with a small footprint.
Functions
. Thermal shutdown protector built in.
. Standby switch built in.
Package Dimensions
unit : mm
3113-SIP14HZ
[LA4598]
Features
. No heat sink needed during 9 V operation
. PO = 2.9 W × 2 (VCC = 9 V, RL = 3.2 , THD = 10%).
. Less quiescent current. (VCC = 9 V, 20 mA, typ).
. Operating voltage range: VCC op = 4.2 to 16 V.
SANYO : SIP14HZ
With arbitrarily large heat
sink
Al heat sink tightening
torque 4kg.cm
With silicone grease
applied
With Sanyo-
recommended board
Independent IC
Specifications
Ambient temperature, Ta − °C
Maximum Ratings at Ta = 25 °C
Parameter
Maximum supply voltage
Allowable power dissipation
Junction temperature
Operating temperature
Storage temperature
Symbol
VCC max
Pd max*
Tj max
Topr
Tstg
Conditions
No heat sink
* With Sanyo-recommended board (9.0 cm × 8.5 cm × 1.5 mm (thickness))
Ratings
18
3.6
+150
–20 to +75
–40 to +150
Unit
V
W
°C
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
D3095HA/N1792TS(II) No.4087-1/9

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LA4598
Operating Conditions at Ta = 25 °C
Parameter
Recommended supply voltage
Recommended load resistance
Operating voltage range
Symbol
VCC
RL
VCC op
Conditions
Ratings
9
3.2
4.2 to 16.0
Unit
V
V
Operating Characteristics at Ta = 25 °C, VCC = 9 V, f = 1 kHz, Rg = 600 , RL = 3.2
Parameter
Symbol
Conditions
min typ max
Quiescent current
Voltage gain
ICCO
VG
10 20
47 49
40
51
Output power
Total harmonic distortion
Input resistance
PO1
PO2
THD
ri
THD = 10%
THD = 10%, RL = 4
VO = 2 V
2.2 2.9
2.3
0.3
20 30
1.0
Output noise voltage
Ripple rejection ratio
Channel separation
Standby current
VNO1
VNO2
Rr
CH Sep
Isd
Rg = 0, B.P.F = 20 Hz to 20 kHz
Rg = 10 k, B.P.F = 20 Hz to 20 kHz
Rg = 0, fr = 100 Hz, VCCr = 150 mV
Rg = 10 k, VO = 0 dB
0.4
0.6
40 50
45 55
1.0
2.0
10
unit
mA
dB
W
W
%
k
mV
mV
dB
dB
µA
Block Diagram
ch1 Input
ch1 NF
Pre GND
D.C
Input
amplifier
Predrive
amplifier
Power
amplifier
Bias circuit
Thermal shutdown
protector
Standby switch
ch1 BS
ch1 output
Power GND
VCC
Standby
ch2 Input
ch2 NF
Input
amplifier
Predrive
amplifier
Power
amplifier
ch2 output
ch2 BS
Sample Print Pattern
Copper-foiled side 85 × 90 mm2
Unit (resistance: , capacitance: F)
No.4087-2/9

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Sample Application Circuit
To large signal GND
LA4598
Mylar capacitor
Unit (resistance:, capacitance:F)
Mylar capacitor
C + R can be added to the negative side of the output capacitor.
However, this is true only for a Sanyo-recommended board; for a set board, artwork must also be
considered.
Description of External Components
C1, C8: Bootstrap capacitors
These capacitors affect low-region output; if the capacitor value is reduced, the low-region output decreases. Therefore,
47 µF or more is desirable.
C2, C6: Output capacitors
If the capacitor value is reduced, low-region roll-off frequency fL and low-region Po worsen.
C3, C7: Oscillation blocking capacitors
Mylar capacitor, which is excellent in temperature characteristics and frequency characteristics is used.
C4: Power supply capacitor
The capacitor values depends on the power supply line loads (motor, and the like.) and transformer ripple component.
1000 µF to 2200 µF is recommended.
C5: Standby capacitor
Pop noise reduction capacitor
C9, C11: Feedback capacitors
In addition to affecting low-region roll-off frequency fL, if the capacitor value is increased, the start-up time is extended.
C10: Decoupling capacitor
This capacitor absorbs power supply ripples; 220 µF is recommended.
R1, R2: Oscillation blocking resistors
The resistor value may be varied 3.3 to 1.0 .
No.4087-3/9

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LA4598
Frequency, f − Hz
Pd when VCC=12 V
Pd when 9 V
Output power, PO − W
Output power, PO − W
Output power, PO − W
Supply voltage, VCC − V
Supply voltage, VCC − V
No.4087-4/9

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LA4598
CH2 to CH1
leak
CH1 to CH2
leak
Frequency, f − Hz
Supply voltage, VCC − V
Frequency, f − Hz
Output power, PO − W
DIN Audio with
20 Hz to 20 kHz BPF
Supply voltage, VCC − V
Supply voltage, VCC − V
No.4087-5/9