RT9737WSC datasheet(6/7 Pages) RICHTEK

6 / 7 page

RT9737

is a registered trademark of Richtek Technology Corporation

www.richtek.com

DS9737-00

February

2014

Application Information

RT9737 is a 5V high quality low-voltage double-pole

double-throw (DPDT) analog switch. RT9737 supply

voltage is designed to operate from 2.5 to 5.5V. Supply

voltage can be smaller than input voltage while keeping

5V input range. With 70m

 turn-on resistance, power-

loss and signal distortion can be minimized. RT9737 is

ideal for switching audio signal from outputs of audio

amplifiers. The break-before-make feature prevents

signal distortion during the transferring of a signal from

one path to another for audio applications.

Analog Input

RT9737 internal topology design for input and output

voltage level can greater than supply voltage.

Low turn-on resistance and excellent channel to

channel matching are ideal for audio applications.

Switch Logic Control

RT9737 can use SEL pin to control internal switches

position for another audio source application. SEL pin

input current is very low.

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and ambient temperature.

The maximum power dissipation can be calculated by

the following formula :

PD(MAX) = (TJ(MAX)  TA) / JA

where TJ(MAX) is the maximum junction temperature,

TA is the ambient temperature, and JA is the junction to

ambient thermal resistance.

For recommended operating condition specifications,

the maximum junction temperature is 125

C. The

junction to ambient thermal resistance,

JA, is layout

dependent.

For

WL-CSP-9B

1.24x1.24

(BSC)

packages, the thermal resistance,

JA, is 78.1C/W on

a standard JEDEC 51-7 four-layer thermal test board.

The maximum power dissipation at TA = 25C can be

calculated by the following formula :

PD(MAX) = (125C  25C) / (78.1C/W) = 1.28W for

WL-CSP-9B 1.24x1.24 (BSC) package

The maximum power dissipation depends on the

operating ambient temperature for fixed TJ(MAX) and

thermal resistance,

JA. The derating curve in Figure 1

allows the designer to see the effect of rising ambient

temperature on the maximum power dissipation.

Figure 1. Derating Curve of Maximum Power

Dissipation

INA1

INA2

INB1

OUTB

INB2

OUTA

GND

Place the capacitor CVDDEN as

close as possible to the VDDEN.

Use blind hole to

connect other strong

ground plane.

CVDDEN

Figure 2. PCB Layout Guide

Four-Layer PCB

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