January 1999 TOKO, Inc.
Page 1
TK70002
CONT 2
GND
OUTPUT 2
CONT 1
INPUT
OUTPUT 1
SW
CIRCUIT
THERMAL
PROTECTION
BASE
CONTROL
CURRENT
BASE
CONTROL
CURRENT
SW
CIRCUIT
FEATURES
s
Internal PNP Power Transistor
s
Reverse Bias Voltage Protection
s
Very Low Input-Output Voltage Difference
s
Very Low Standby Current
s
Overtemperature Protection
s
Single Input with Two Controlled Outputs
s
Active High On/Off Control
APPLICATIONS
s
Battery Powered Systems
s
Radio Control Systems
s
Automatic Test Equipment (ATE)
s
Power Management
s
Process Control Equipment
s
Power Distribution Control
BLOCK DIAGRAM
TK70002
20P
INPUT
OUTPUT 1
CONT 2
CONT 1
OUTPUT 2
GND
DESCRIPTION
The TK70002 is a monolithic bipolar integrated circuit with
high side current switches of low saturation type. The
supply current, including the control current, is virtually
zero (pA level) when the control pin is "off". The impedance
on the output side is high and the reverse current does not
flow when the control pin is "off." These are effective to
decrease the dissipation currents, making the TK70002 a
very efficient device for power management and power
distribution control.
The TK70002 is available in a miniature SOT-23-6 surface
mount package. When mounted as recommended, this
package is capable of dissipating up to 350mW.
ORDERING INFORMATION
TAPE/REEL CODE
B: Tape Left
Tape/Reel Code
TK70002MCB
SINGLE INPUT, TWO OUTPUT SOLID STATE SWITCH
Page 2
January 1999 TOKO, Inc.
TK70002
ABSOLUTE MAXIMUM RATINGS
Storage Temperature Range ................... -55 to +150
°
C
Operating Temperature Range ................... -30 to +80
°
C
Operating Voltage Range ............................... 1.6 to 12 V
Lead Soldering Temperature (10 s) ..................... 235
°
C
TK70002 ELECTRICAL CHARACTERISTICS
Test conditions: V
IN
= 2.5 V, T
A
= 25
°
C, unless otherwise specified.
Note 1: Power dissipation is 350 mW when mounted as recommended. Derate at 2.8 mW/
°
C for operation above 25
°
C. Power dissipation is
150 mW in Free Air. Derate at 1.2 mW/
°
C for operation above 25
°
C.
Note 2: By grounding this terminal, the operation completely stops and the input current decreases to a pA level.
Note 3: Ground current is defined as I
IN
- I
OUT
, excluding control current. Refer to "Definition of Terms."
Gen. Note: Parameters with min. or max. values are 100% tested.
Gen. Note: Exceeding the "Absolute Maximum Ratings" can damage the device.
Supply Voltage ......................................................... 14 V
Output Current .................................................... 130 mA
Power Dissipation (Note 1) ................................ 350 mW
Control Terminal Voltage ........................................... 8 V
Reverse Bias Voltage ................................................. 8 V
L
O
B
M
Y
S
R
E
T
E
M
A
R
A
P
S
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,
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m
0
=
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N
O
C
5
2
.
0
5
6
.
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m
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8
=
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T
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V
0
=
5
.
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)
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=
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.
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5
.
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A
m
V
P
O
R
D
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g
a
t
l
o
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t
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=
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3
.
0
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V
D
s
l
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n
a
h
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,
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c
n
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f
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m
0
5
=
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5
2
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m
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r
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0
=
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=
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=
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.
0
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5
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n
L
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6
.
1
=
7
5
1
A
µ
V
)
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(
T
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)
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g
a
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January 1999 TOKO, Inc.
Page 3
TK70002
TYPICAL PERFORMANCE CHARACTERISTICS
TEST CIRCUIT
IOUT 1
OUTPUT 1
ICONT 2
CONT 1
CONT 2
IOUT 2
ICONT 1
VCONT 2
VCONT 1
OUTPUT 2
CIN
0.1 µF
VIN
IIN
INPUT
VOUT 2
VOUT 1
CL 1 = 0.1 µF
CL 2 = 0.1 µF
RCONT 2
RCONT 1
CONTROL CURRENT 1
VS.
CONTROL VOLTAGE
VCONT (V)
I CONT
(
A)
0
20
40
60
80
100
0 2 4 6 8 10
RCONT = 0
CONTROL CURRENT 2
VS.
CONTROL VOLTAGE
VCONT (V)
I CONT
(
A)
0
10
30
20
40
0 1 2 3 4 5
RCONT = 0
VOUT
100 k
200 k
IOUT (mA)
V
DROP
(mV)
-400
-300
-200
-100
0
0 50 100
VIN = 1.0 V
1.2 V
1.4 V
1.8V
1.6 V
DROPOUT VOLTAGE
VS.
OUTPUT CURRENT
DROPOUT VOLTAGE
VS.
OUTPUT CURRENT
IOUT (mA)
V
DROP
(
m
V)
-400
-300
-200
-100
0
0 100 200
VIN = 2.5 V
PARALLEL
OPERATION
SINGLE
OPERATION
GROUND CURRENT
VS.
OUTPUT CURRENT
IOUT (mA)
I GND
(
m
A)
0
5
10
0 50 100
1.8 V
VIN = 1.0 V
1.2 V
1.4 V
1.6 V
REVERSE CURRENT
VS.
REVERSE VOLTAGE
VREV (V)
I REV
(
n
A)
0
1
2
0 5 10 15
Page 4
January 1999 TOKO, Inc.
TK70002
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
GROUND CURRENT
TA (
°
C)
I GND
(
m
A)
0
2
3
-50 0 50 100
IOUT = 50 mA
DROPOUT VOLTAGE
TA (
°
C)
V
DROP
(mV)
240
-50 0 50 100
200
100
IOUT = 50 mA
OUTPUT CURRENT
TA (
°
C)
I OUT
(mA)
90
140
-50 0 50 100
130
100
VIN = 2.5 V
AT VDROP = 0.5 V
110
120
CONTROL VOLTAGE (VOUT = ON)
TA (
°
C)
V
CONT
(V)
0
1.0
-50 0 50 100
0.5
ON/OFF RESPONSE 1
TIME (µs)
0 1 0 10 20
VCONT
CL = 0.01 µF
ILOAD = 30 mA
CL = 0.1 µF
LOAD STEP RESPONSE
0 4 8 12 16
CL = 0.01 µF
ILOAD = 0 to 30 mA
CL = 0.1 µF
TIME (µs)
100 mV/DIV
CONTROL CURRENT
TA (
°
C)
I CONT
(µA)
0
10
-50 0 50 100
8
6
4
2
VCONT = 1.6 V
ON/OFF RESPONSE 2
TIME (µs)
0 1 2 3 4
VCONT
CL = 0.1 µF
ILOAD = 30 mA
CL = 0.01 µF
CL = NONE
January 1999 TOKO, Inc.
Page 5
TK70002
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
PACKAGE POWER DISSIPATION (P
D
)
This is the power dissipation level at which the thermal
sensor is activated. The IC contains an internal thermal
sensor which monitors the junction temperature. When the
junction temperature exceeds the monitor threshold of
150
°
C, the IC is shut down. The junction temperature
rises as the difference between the input power (V
IN
x I
IN
)
and the output power (V
OUT
x I
OUT
) increases. The rate of
temperature rise is greatly affected by the mounting pad
configuration on the PCB, the board material, and the
ambient temperature. When the IC mounting has good
thermal conductivity, the junction temperature will be low
even if the power dissipation is great. When mounted on
the recommended mounting pad, the power dissipation of
the SOT-23-6 is increased to 350 mW. For operation at
ambient temperatures over 25
°
C, the power dissipation of
the SOT-23-6 device should be derated at 2.8 mW/
°
C. To
determine the power dissipation for shutdown when
mounted, attach the device on the actual PCB and
deliberately increase the output current (or raise the input
voltage) until the thermal protection circuit is activated.
Calculate the power dissipation of the device by subtracting
the output power from the input power. These
measurements should allow for the ambient temperature
of the PCB. The value obtained from P
D
/(150
°
C - T
A
) is the
derating factor. The PCB mounting pad should provide
maximum thermal conductivity in order to maintain low
device temperatures. As a general rule, the lower the
temperature, the better the reliability of the device. The
thermal resistance when mounted is expressed as follows:
T
j
= 0
jA
x P
D
+ T
A
For Toko ICs, the internal limit for junction temperature is
150
°
C. If the ambient temperature (T
A
) is 25
°
C, then:
150
°
C = 0
jA
x P
D
+ 25
°
C
0
jA
= 125
°
C/ P
D
P
D
is the value when the thermal sensor is activated. A
simple way to determine P
D
is to calculate V
IN
x I
IN
when
the output side is shorted. Input current gradually falls as
temperature rises. You should use the value when thermal
equilibrium is reached.
DROPOUT VOLTAGE (V
DROP
)
The output voltage decreases with the increase of output
current. It is dependent upon the load current and the
junction temperature. It measures the differential voltage
between the input voltage and the output voltage when the
input voltage is set to 2.5 V and the output current is set to
50 mA.
OUTPUT CURRENT (I
OUT
)
The rated output current is specified under the condition
where the output voltage drops 0.5 V below the no load
value. The input voltage is set to 2.5 V, and the current is
pulsed to minimize temperature effects.
QUIESCENT CURRENT (I
Q
)
The quiescent current is the current which flows through
the ground terminal under no load conditions (I
OUT
= 0 mA)
with V
IN
= 2.5 V and excludes the control pin current.
STANDBY CURRENT (I
STBY
)
Standby current is the current which flows into the solid
state switch when the output is turned off by the control
function (V
CONT
= 0 V). It is measured with V
IN
= 8 V.
GROUND CURRENT (I
GND
)
Ground current is the current which flows through the
ground pin(s). It is defined as I
IN
- I
OUT
, excluding control
current.
ON/OFF CONTROL
High is "on" (referenced to ground). The input current is at
the pA level by connecting the control terminal to ground.
REVERSE VOLTAGE PROTECTION
Reverse voltage protection prevents damage due to the
output voltage being higher than the input voltage. This
fault condition can occur when the output capacitor remains
charged and the input is reduced to zero, or when an
external voltage higher than the input voltage is applied to
the output side.
Page 6
January 1999 TOKO, Inc.
TK70002
OUTPUT 1
CONT 1
OUTPUT 2
INPUT
CONT 2
GND
The range of usable currents can also be found from the
graph below.
Procedure:
1) Find P
D
2) P
D1
is taken to be P
D
x (~0.8 - 0.9)
3) Plot P
D1
against 25
°
C
4) Connect P
D1
to the point corresponding to the 150
°
C
with a straight line.
5) In design, take a vertical line from the maximum
operating temperature (e.g., 75
°
C) to the derating
curve.
6) Read off the value of P
D
against the point at which the
vertical line intersects the derating curve. This is taken
as the maximum power dissipation, D
PD
.
The maximum operating current is:
I
OUT
= (D
PD
/ (V
IN(MAX)
-
V
OUT
)
SOT-23-6 BOARD LAYOUT
SOT-23-6 POWER DISSIPATION
0 50 100 150
TA (
°
C)
P
D
(mW)
0
250
450
50
150
350
MOUNTED AS
SHOWN
FREE AIR
DEFINITIONS AND TERMS (CONT.)
PD
DPD
25
50
75
150
(mW)
TA (
°
C)
3
6
5
4
BOARD LAYOUT
APPLICATION INFORMATION
January 1999 TOKO, Inc.
Page 7
TK70002
Marking Information
Marking
TK70002
02S
0.95
0.95
0.95
0.95
e
M
0.1
2.9
2.8
1.90
2.4
e
e
1
Recommended Mount Pad
1
2
3
4
6
1.0
0.7
0 ~ 0.1
(0.6)
(0.6)
1.4 max
(1.9)
e
e
e
5
Marking
0.3
+
0.15
0.1
+
0.3
1.1
0.1
+
1.6
0-13
Dimensions are shown in millimeters
Tolerance: x.x = 0.2 mm (unless otherwise specified)
0.1
SOT-26 (SOT-23-6)
PACKAGE OUTLINE
Printed in the USA
© 1999 Toko, Inc.
All Rights Reserved
TOKO AMERICA REGIONAL OFFICES
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
IC-217-TK70002
0798O0.0K
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its
products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of
third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: (203) 748-6871
Fax: (203) 797-1223
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
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