Ordering number: ENN6984

Monolithic Linear IC

LA4635B
For General Audio Use
2-Channel BTL AF Power Amplifier

Overview Package Dimensions

The LA4635B is a 2-channel power IC that is pin-compat- unit: mm
ible with the LA4636. 3049B-SIP12H
It represents a new concept in devices of this type by
[LA4635B]
allowing design editing based on common circuit board pin
compatibility for products of different power ranks. It is
26.8 4.0
compatible with VCC = 9 V and VCC = 12 V specifications (20.0)
and is available in two versions with different voltage
gains (LA4635B with VG = 45 dB and LA4635A with VG
= 35 dB).

13.2max
(8.4)

(R1.7)
(11.8)
7.0

1.0min

6.0
1 12
0.4
(2.4) 2.0 0.5 1.0
2.0

SANYO: SIP12H
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max No signal 24 V
Maximum output current Io peak Per channel 2.5 A
Allowable power dissipation Pd max Infinite heat sink 25 W
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +150 °C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 12 V
Recommended load resistance RL op 3 to 8 Ω
Allowable operating voltage range VCC op 5.5 to 22 V
* Set VCC, RL, and output level such that Pd max. is not exceeded for the size of heat sink used.

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.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
70102RM (II) No. 6984-1/3
 LA4635B

Operating Characteristics at Ta = 25°C, VCC = 12 V, RL = 3 Ω, f = 1 kHz, Rg = 600 Ω

Parameter Symbol Conditions Ratings
min typ max Unit
Quiescent current ICCO Rg = 0 18 35 80 mA
Standby current Ist 1 10 µA
Voltage gain VG VO = 0 dBm 43 45 47 dB
Total harmonic distortion THD PO = 1 W 0.25 0.8 %
Output power P O1 THD = 10% 3.0 4.5 W
P O2 VCC = 9 V, THD = 10% 2.0 2.5 W
Output noise voltage VNO Rg = 0, BPF = 20 Hz to 20 kHz 0.15 0.5 mV
Ripple rejection SVRR Rg = 0, fR = 100 Hz, VR = 0 dBm 45 55 dB
Channel separation CH Sep Rg = 10 kΩ, VO = 0 dBm 45 55 dB
Input resistance Ri 20 30 40 kΩ
Standby pin voltage VST Amplifier on (pin 5 voltage) 1.5 5.0 V

Circuit Application Example

LA4635B

(Popping Noise
(Ripple Filter) PRE Eliminator) PWR
DC IN1 GND IN2 STBY P.P VCC OUT2 NC GND NC OUT1
1 2 3 4 5 6 7 8 9 10 11 12 * If voltage is to be
Top view
applied to the Standby
Rx

1000µF

1000µF
100µF

+ + + + + +
4.7µF

pin (pin 5), a resistor

50V

50V
1µF

1µF
16V

16V

16V

16V

(Rx) should be
inserted to limit the
RL
RL

inflow current, as
5V

1000µF

+
required. Please refer
25V

ILA00780
to the information
VCC below.

(Reference) Pin 5 Equivalent Circuit Inside IC • The amplifier can be turned on and off by controlling
the level (high/low) of pin 5.
R2 • Applying a signal equal or greater than 1.5 V and
Rx Ix
800 µA to pin 5 turns on the amplifier. (If 5 V is applied
STBY 2kΩ
5
Standby + directly to pin 5 the inflow current of pin 5 is approxi-
2kΩ

Pin Voltage
R1

Vx Ix=max 4.5mA
mately 4.5 mA.)
• If a voltage, Vx, exceeding 5 V is to be applied, current
limiting resistor (Rx) should be inserted to limit the
ILA00781
inflow current to 4.5 mA. (See following equation.)
Rx = (Vx – 5 V) / 4.5 mA
Pd max -- Ta • If pin 5 is to be controlled by the microprocessor, the
30
pin 5 inflow current (Ix) should be optimized for the
Allowable power dissipation, Pd max – W

AI heat sink
Infinite heat sink Mounting
torque 39N•cm
capacity of the microprocessor by calculating Rx using
25
F l a t wa s h e r
S i l i c o n e gr e a s e
the following equation, as a general guideline, and then
20
applied confirming the inflow current through actual measure-
qjc=3°C / W ment.
15 Rx = (Vx / Ix) – R1 (2 kΩ)
100 ¥ 100 ¥ 1.5 mm3
12.5

10
50 ¥ 50 ¥ 1.5 mm3
7 Note: The LA4635B is basically pin-compatible with the
5
Single IC LA4636, but there are partial differences in
3.2

0
operation and usage, including with regard to
--20 0 20 40 60 80 100 120 140 160
Ambient temperature, Ta – °C
externally connected parts.
ILA00777

No. 6984-2/3
 LA4635B

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 July, 2002. Specifications and information herein are subject to
change without notice.

PS No. 6984-3/3
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