WAS4736
WAS4736
MIC/GND Cross-point Switch for CITA and
OMTP Mobile Audio Key Application
Descriptions
The WAS4736 is an audio jack detection switch for
CITA and OMTP 4-pole accessories. The pin MIC is on
audio key side, as WAS4736' O1/O2 is plugged into
audio jack of cell phone, it will detect the locations of
ground (GND) and microphone (MIC) poles on the
audio plug and automatically routes them to the
appropriate connections.
The MIC switch' Ron is 5 Ω (typical) while the Ground
switch has a low Ron of 0.5 Ω (typical) to minimize
voltage drop across it, preventing undesired increase
in ground reference voltage.
As VCC is power-up, WAS4736 is enabled and it
consumes ultra-low quiescent current, less than 600nA
(typical). The range of signal swing in transmission can
be rail-to-rail (0~VCC), even WAS4736 can tolerate
signal swing higher than VCC but less than VCC+3V
with very little inverse leakage into VCC supply and not
any damage of the device. The speed of signal is
recommended not more than 300KHz.
The WAS4736 is available in SOT-353 package.
Standard product is Pb-Free and halogen-Free.
1
2
3
5
4
http://www.sh-willsemi.com
SOT-353(SC70-5)
Pin configuration (Top view)
36*
36 = Device code
Features
Supply voltage range : 2.3 ~ 5.5V
Detects polarity of GND and MIC on 4-pole plugs
Automatically routes GND and MIC to audio jack
terminals
low R
DSON
for MIC Switch (5 Ω) and GND switch
(0.5 Ω)
Ultra-Low quiescent current, < 600nA (typical)
ESD Rating (MIL-STD-883J / Method 3015.8)
IO to GND
Power to GND
:
±8KV
:
±8KV
Device
WAS4736B-5/TR
* = Month (A~Z)
Marking
Order information
Package
SOT-353
Shipping
3000/Reel&Tape
Applications
Mobile Audio Key
Will Semiconductor Ltd.
1
Feb, 2015 - Rev. 1.1
WAS4736
Pin descriptions
Pin Number
1
2
3
4
5
Symbol
O1
GND
O2
VCC
MIC
Ground
Output Two that connects to pole 3(or 4) of Audio Jack
Power Supply that supports 2.3v ~ 5.5v
MIC input from Audio Key
Descriptions
Output One that connects to pole 4(or 3) of Audio Jack
Functional Block
Typical Applications
Audio Jack
VBAT
R
1 GND/MIC
3 MIC/GND
L
Audio Key MCU
MIC
GND
4
MIC 5
GND 2
Auto Switch
Will Semiconductor Ltd.
2
Feb, 2015 - Rev. 1.1
WAS4736
Absolute Maximum Ratings
(1)
Parameter
Supply Voltage
Control Input Voltage
DC Input Voltage
(2)
Continuous Current through COMx
Storage Temperature Range
Junction Temperature under Bias
Lead Temperature (Soldering, 10 seconds)
Power Dissipation
HBM (MIL-STD-883H/Method 3015.8)
ESD
MM (JESD22-A115)
IO to GND
Power to GND
IO to GND
Power to GND
T
STG
T
J
T
L
P
D
Symbol
V
CC
VIN
X
V
INPUT
Value
-0.3 ~ 6.5
-0.3 ~ 6.5
-0.3 ~ 6.5
±100
-65 ~ 150
150
260
250
±8
±8
±900
±900
Unit
V
V
V
mA
o
o
o
C
C
C
mW
KV
KV
V
V
Recommend operating ratings
(3)
Parameter
Supply Voltage Operating
Control Input Voltage
Input Signal Voltage
Operating Temperature
Input Raise and Fall Time(Control Input V
CC
=2.3~5.5V)
Thermal Resistance
Symbol
V
CC
V
IN
V
IS
T
A
t
r
,t
f
R
θJA
Value
2.3 ~ 5.5
0.0 ~ V
CC
0.0 ~ V
CC
-40 ~ 85
0 ~ 10
350
o
Unit
V
V
V
o
C
ns/V
C/W
Note:
1.
“Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating
and operation of the device at these or any other conditions beyond those indicated in the operational
sections of this specification is not implied.
2.
The input and output negative voltage ratings may be exceeded if the input and output diode current
ratings are observed.
Will Semiconductor Ltd.
3
Feb, 2015 - Rev. 1.1
WAS4736
DC Electronics Characteristics
(Ta=25
o
C, VCC=3.6V, unless otherwise noted)
Parameter
Supply quiescent current
GND path On-Resistance
MIC path On-Resistance
Symbol
I
CC
R
ON-GND
R
ON-MIC
Conditions
VCC is power-up
Min.
Typ.
600
0.5
5
Max.
Unit
nA
Ω
Ω
AC Electronics Characteristics
(Ta=25
o
C, VCC=3.6V, unless otherwise noted)
Parameter
MIC path -3dB Bandwidth
Symbol
BW
Conditions
MIC Bias=1.8V
MIC pull-up resistor =2K
Min.
Typ.
50
Max.
Unit
MHz
(Not tested but guaranteed by design)
Capacitance
(Ta=25
o
C unless otherwise noted)
Parameter
Off capacitance
On capacitance
Symbol
C
OFF
C
ON
Conditions
F=100KHz, VCC=3.3
F=100KHz, VCC=3.3
Min.
Typ.
100
140
Max.
Unit
pF
pF
Will Semiconductor Ltd.
4
Feb, 2015 - Rev. 1.1
WAS4736
Typical Characteristics
(Ta=25
o
C, unless otherwise noted)
0.50
500
400
V
CC
= 3V
I
CC
I
MIC
Quiescent Current ( uA )
Input Pin Current ( uA )
5.5
0.45
0.40
0.35
0.30
0.25
0.20
2.5
V
CC
= 5.0V
3.0
3.5
4.0
4.5
5.0
300
200
100
0
-100
-200
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage ( V )
MIC Input Voltage ( V )
Quiescent Current vs. Input Voltage
Input Pin Current vs. MIC Input Voltage
CTIA_USA Test (Square
Wave)
CTIA_USA Test (Sine
Wave)
OMTP_EUR Test (Square
Wave)
OMTP_EUR Test (Sine
Wave)
Will Semiconductor Ltd.
5
Feb, 2015 - Rev. 1.1
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