LMS4684
0.5
Low-Voltage, Dual SPDT Analog Switch
General Description
The LMS4684 is a low on-resistance, low voltage dual SPDT
(Single-Pole/Double-Throw) analog switch that operates
from a 1.8V to 5.5V supply. The LMS4684 features a 0.5
R
ON
for its NC switch and 0.8
R
ON
for its NO switch at a
2.7V supply. The digital logic inputs are 1.8V logic-
compatible with a 2.7V to 3.3V supply.
The LMS4684 is available in the 12 bump micro SMD and
the 10 lead LLP miniature packages. These PCB real estate
saving packages offer extreme performance while saving
money with small footprints.
Features
n
NC switch R
ON
0.5
max
@
2.7V
n
NO switch R
ON
0.8
max
@
2.7V
n
50nA (max) supply current
T
A
= 25C
n
1.8 to 5.5V single supply operation
n
12-Bump micro SMD package
n
LLP-10 package, 3x4mm
n
See AN-1112 for micro SMD package considerations
n
See AN-1187 for LLP package considerations
Applications
n
Power routing
n
Battery-operated equipment
n
Communications circuits
n
Modems
n
Cell phones
Connection Diagrams
10-LLP Package
12-Bump micro SMD Package
20077501
DAP needs to be connected to pin 6 on the board
Top View
20077502
Center Bumps B2 and C2 are Not Electrically Connected
Top View
(Bumped Side Down)
IN
NO
NC
0
Off
On
1
On
Off
Switches shown for Logic "0" input
June 2004
LMS4684
0.5
Low-V
oltage,
Dual
SPDT
Analog
Switch
2004 National Semiconductor Corporation
DS200775
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
+
, IN
-0.3V to 6.0V
COM, NO, NC
-0.3V to (V
+
+ 0.3V)
Continuous Current NO, NC,
COM
400mA
ESD Tolerance (Note 2)
Human Body Model
2000V
Machine Model
200V
Storage Temperature Range
-65C to 150C
Junction Temperature (Note 3)
150C Max
Operating Ratings
Nominal Supply Voltage
1.8V to 5.5V
Temperature Range
-40C to 85C
Thermal Resistance
JA
LLP-10
TBD
micro SMD-12
TBD
Electrical Characteristics
Unless otherwise specified, V
+
= 2.7 to 3.3V, V
IH
= 1.4V, V
IL
= 0.5V. Typical values are measured at 3V, and T
J
= 25C.
Boldface limits apply at temperature extremes.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
NO
,
V
NC
,
V
COM
Analog Signal Range
0
V
+
V
R
ON (NC)
NC-On-Resistance (Note 4)
V
+
=2.7, I
COM
=100ma,
V
NC
=0 to V
+
0.3
0.5
R
ON (NO)
NO-On-Resistance (Note 4)
V
+
=2.7, I
COM
=100ma,
V
NO
=0 to V
+
0.45
0.8
R
ON
On-Resistance Match Between
Channels (Note 4), (Note 5)
V
+
=2.7, I
COM
=100ma,
V
NC
or V
NO
=1.5V
0.06
R
FLAT(NC)
NC-On-Resistance Flatness (Note 6)
V
+
=2.7V,
I
COM
=100mA,
V
NC
=0 to V
+
LLP
T
J
=0C to 85C
0.15
micro SMD
T
J
=0C to 85C
0.17
LLP
T
J
= -40C to +85C
0.18
micro SMD
T
J
= -40C to +85C
0.20
R
FLAT(NO)
NO-On Resistance Flatness (Note 6)
V
+
=2.7V, I
COM
=100mA,
V
NO
= 0 to V
+
0.35
I
NO(OFF)
or
I
NC(OFF)
NO or NC Off-Leakage Current
V
+
=3.3V, V
NO
or V
NC
=3V,
0.3V; V
COM
=0.3V, 3V
-1
1
nA
-10
10
I
COM
(ON)
COM On-Leakage Current
V
+
=3.3V, V
NO
or V
NC
=3V,
0.3V, or floating; V
COM
=3V, or floating
-2
2
nA
-20
20
Dynamic Characteristics
t
ON
Turn-On Time
V
+
=2.7V, V
NO
or V
NC
=1.5V;
R
L
=50
; C
L
=35pF;
35
55
ns
65
t
OFF
Turn-Off Time
V
+
=2.7V, V
NO
or V
NC
=1.5V;
R
L
= 50
; C
L
=35pF;
25
30
ns
40
t
BBM
Break-Before-Make-Delay
V
+
=2.7V, V
NO
or V
NC
=1.5V;
R
L
=50
; C
L
=35pF;
2
15
ns
Q
Charge Injection
COM =0; R
S
=0; C
L
= 1nF;
200
pC
Digital I/O
V
IH
Input Logic High
1.4
V
V
IL
Input Logic Low
0.5
V
I
IN
IN Input Leakage Current
V
IN
=0 or V
+
-1
1
A
LMS4684
www.national.com
2
Electrical Characteristics
(Continued)
Unless otherwise specified, V
+
= 2.7 to 3.3V, V
IH
= 1.4V, V
IL
= 0.5V. Typical values are measured at 3V, and T
J
= 25C.
Boldface limits apply at temperature extremes.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Power Supply
V
+
Power-Supply Range
1.8
5.5
V
I+
Supply Current (Note 4)
-50
0.04
50
nA
-200
200
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed.
Note 2: Human body model: 1.5k
in series with 100pF. Machine model, 0 in series with 200pF.
Note 3: The maximum power dissipation is a function of T
J(max)
JA
and T
A
.
Note 4: Guaranteed by design.
Note 5:
R
ON
is equal to the difference between NC1/NC2 R
ON
or NO1/NO2 R
ON
at a specified voltage.
Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges.
Symbolic Diagram
20077503
Ordering Information
Package
Part Number
Package Marking
Transport Media
NSC Drawing
12-Bump
micro SMD
LMS4684ITL
F09A
250 Units Tape and Reel
TLA12DPA
LMS4684ITLX
3k Units Tape and Reel
10-Pin LLP
LMS4684LD
L4684
1k Units Tape and Reel
LDA10B
LMS4684LDX
4.5k Units Tape and Reel
Pin Descriptions
Name
Pin ID
Description
LLP
micro SMD
NC
5, 7
D3, D1
Analog switch normally closed terminal
IN
4, 8
C3, C1
Digital control input
COM
3, 9
B3, B1
Analog switch common terminal
NO
2, 10
A3, A1
Analog switch normally open terminal
V
+
1
A2
Positive supply voltage
GND
6, GND
D2
Ground
B2, C2
Not electrically connected. Can be used to help dissipate heat by connecting to GND
pin.
LMS4684
www.national.com
3
Typical Performance Characteristics
Supply Current vs. Supply Voltage
NO ON Resistance vs. COM Voltage
20077504
20077505
NC ON Resistance vs. COM Voltage
Logic Threshold Voltage vs. Supply Voltage
20077506
20077507
Turn-on / Turn-off Times vs. Temperature
Charge Injection vs. COM Voltage
20077508
20077509
LMS4684
www.national.com
4
Typical Performance Characteristics
(Continued)
NC On-Resistance vs. COM Voltage
NC On-Resistance vs. COM Voltage
20077515
20077516
NO On-Resistance vs. COM Voltage
NO On-Resistance vs. COM Voltage
20077517
20077518
LMS4684
www.national.com
5
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