TK11346BU (TOKO)
VOLTAGE REGULATOR

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TK113xxBM/U
VOLTAGE REGULATOR WITH ON/OFF SWITCH
FEATURES
s High Voltage Precision at ± 2.0%
s Active Low On/Off Control
s Very Low Dropout Voltage 80 mV at 30 mA
s Very Low Noise
s Very Small SOT23L or SOT89 Surface Mount
Packages
s Internal Thermal Shutdown
s Short Circuit Protection
DESCRIPTION
The TK113xxB is a low dropout linear regulator with a built-
in electronic switch. The device is in the “on” state when
the control pin is pulled to a low level. An external capacitor
can be connected to the noise bypass pin to lower the
output noise level to 30 µVrms.
An internal PNP pass transistor is used to achieve a low
dropout voltage of 80 mV (typ.) at 30 mA load current. The
TK113xxB has a very low quiescent current of 170 µA at no
load and 1 mA with a 30 mA load. The standby current is
typically 100 nA. The internal thermal shut down circuitry
limits the junction temperature to below 150 °C. The load
current is internally monitored and the device will shut
down in the presence of a short circuit or overcurrent
condition at the output.
ORDERING INFORMATION
TK113 B
Voltage Code
Package Code
Tape/Reel Code
Temp. Code
VOLTAGE CODE
20 = 2.0 V
37 = 3.7 V
21 = 2.1 V
38 = 3.8 V
22 = 2.2 V
39 = 3.9 V
23 = 2.3 V
40 = 4.0 V
24 = 2.4 V
41 = 4.1 V
25 = 2.5 V
42 = 4.2 V
26 = 2.6 V
43 = 4.3 V
27 = 2.7 V
44 = 4.4 V
28 = 2.8 V
45 = 4.5 V
29 = 2.9 V
46 = 4.6 V
30 = 3.0 V
47 = 4.7 V
31 = 3.1 V
48 = 4.8 V
32 = 3.2 V
49 = 4.9 V
33 = 3.3 V
50 = 5.0 V
34 = 3.4 V
55 = 5.5 V
35 = 3.5 V
60 = 6.0 V
36 = 3.6 V
80 = 8.0 V
PACKAGE CODE:
M: SOT23L
U: SOT89
TAPE/REEL CODE
L: Tape Left (SOT23L)
B: Tape Left (SOT89)
TEMP. CODE:
C: -30 to +80 °C
I: -40 to +85°C
APPLICATIONS
s Battery Powered Systems
s Cellular Telephones
s Pagers
s Personal Communications Equipment
s Portable Instrumentation
s Portable Consumer Equipment
s Radio Control Systems
s Toys
s Low Voltage Systems
The TK113xxB is available in either 6-pin SOT23L or 5-pin
SOT89 surface mount packages.
TK113xxB
20P
SOT23L
CONTROL
GND
NOISE BYPASS
VIN
GND
VOUT
SOT89
NOISE BYPASS
GND
CONTROL
BLOCK DIAGRAM
VIN
CONTROL
THERMAL
PROTECTION
BANDGAP
REFERENCE
NOISE
BYPASS
VOUT
GND
VIN
VOUT
GND
February 2001 TOKO, Inc.
Page 1


TK11346BU (TOKO)
VOLTAGE REGULATOR

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TK113xxBM/U
ABSOLUTE MAXIMUM RATINGS (VOUT ³ 2.0 V)
Supply Voltage ......................................................... 16 V Storage Temperature Range ................... -55 to +150 °C
Output Current .................................................... 260 mA Operating Temperature Range .................. -30 to +80 °C
Power Dissipation SOT-23L (Note 1) ................ 600 mW Voltage Range ............................................ 1.8 to 14.5 V
Power Dissipation SOT-23L (Note 1) ................ 900 mW Operating Junction Temperature ......................... 150 °C
Reverse Bias ............................................................ 10 V
TK113xxBM/UC ELECTRICAL CHARACTERISTICS (VOUT ³ 2.0 V)
Test conditions: TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
IQ
ISTBY
VOUT
Quiescent Current
Standby Current
Output Voltage
Line Reg Line Regulation
Load Reg Load Regulation
VDROP
Dropout Voltage
IOUT
IOUT(PULSE)
Continuous Output Current
Pulse Output Current
RR Ripple Rejection
VNO Output Noise Voltage
Vref
Noise Bypass Terminal
Voltage
IOUT = 0 mA, Excluding ICONT
VIN = 8 V, Output OFF
IOUT = 30 mA
VOUT 5.5 V, (Note 2)
VOUT 5.6 V, (Note 2)
IOUT = 1 to 60 mA, (Note 2)
IOUT = 1 to 100 mA, (Note 2)
I = 1 to 150 mA, (Note 2)
OUT
IOUT = 60 mA, (Note 2)
IOUT = 150 mA, (Note 2)
(Note 2)
5 ms pulse, 12.5 % duty cycle
f = 400 Hz, CL = 10 µF, CN = 0.1 µF,
VIN = VOUT + 1.5 V, IOUT = 30 mA,
VRIPPLE = 100 mVrms, (Note 3)
10 Hz f 80 kHz, CL = 10 µF,
CN = 0.1 µF, VCN = VOUT + 1.5 V,
IOUT = 60 mA, (Notes 3,4)
170 250
0.1
See Table 1
3.0 20
15 40
6 30
18 60
23 90
0.12 0.20
0.26 0.39
150
180
60
µA
µA
V
mV
mV
mV
mV
mV
V
V
mA
mA
dB
30 µVrms
1.25 V
VOUT /T Temperature Coefficient
IOUT = 10 mA
CONTROL TERMINAL SPECIFICATIONS
40 ppm/°C
ICONT
Control Current
VCONT = 1.8 V, Output ON
12 35
µA
VCONT(ON) Control Voltage ON
Output ON
VCC-1.8
V
V Control Voltage OFF
CONT(OFF)
Output OFF
VCC-0.6
V
Note 1: When mounted as recommended. Derate at 4.8 mW/°C for SOT-23L and 6.4 mW/°C for SOT-89 packages for operation above 25°C.
Note 2: Refer to “Definition of Terms.”
Note 3: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used.
Note 4: Output noise voltage can be reduced by connecting a capacitor to a noise pass terminal.
Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Page 2
February 2001 TOKO, Inc.


TK11346BU (TOKO)
VOLTAGE REGULATOR

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TK113xxBM/U
ABSOLUTE MAXIMUM RATINGS TK113xxBI (VOUT ³ 2.5 V)
Supply Voltage ......................................................... 16 V Storage Temperature Range ...................... -55 to +150 °C
Power Dissipation SOT-23L (Note1) .................. 600 mW Operating Temperature Range ...................... -40 to +85 °C
Power Dissipation SOT-89 (Note1) .................... 900 mW Operating Voltage Range ............................. 1.8 to 14.5 V
Reverse Bias ............................................................ 10 V Junction Temperature ............................................ 150 °C
TK113xxBM/UI ELECTRICAL CHARACTERISTICS (VOUT ³ 2.5 V)
Test conditions: TA = -40 to 85 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
IQ
ISTBY
V
OUT
Quiescent Current
Standby Current
Output Voltage
Line Reg Line Regulation
Load Reg Load Regulation
VDROP
Dropout Voltage
IOUT
IOUT(PULSE)
Continuous Output Current
Pulse Output Current
RR Ripple Rejection
VNO Output Noise Voltage
Vref
Noise Bypass Terminal
Voltage
IOUT = 0 mA, Excluding ICONT
VIN = 8 V, Output OFF
I = 30 mA
OUT
VOUT 5.5 V,(Note 2)
VOUT • 5.6 V,(Note 2)
IOUT = 1 to 60 mA, (Note 2)
IOUT = 1 to 100 mA, (Note 2)
IOUT = 1 to 150 mA, (Note 2)
IOUT = 60 mA, (Note 2)
IOUT = 150 mA, (Note 2)
(Note 2)
5 ms pulse, 12.5 % duty cycle
f = 400 Hz, CL = 10 µF, CN = 0.1 µF,
VIN = VOUT + 1.5 V, IOUT = 30 mA,
VRIPPLE = 100 mVrms, (Note 3)
10 Hz f 80 kHz, CL = 10 µF,
CN = 0.1 µF, VCN = VOUT + 1.5 V,
I = 60 mA, (Notes 3,4)
OUT
VOUT /T Temperature Coefficient
IOUT = 10 mA
CONTROL TERMINAL SPECIFICATIONS
170 300
0.2
See Table 2
3.0 25
15 40
6 40
18 80
23 110
0.12 0.23
0.26 0.40
150
180
60
µA
µA
V
mV
mV
mV
mV
mV
V
V
mA
mA
dB
30 µVrms
1.25 V
40 ppm/°C
I
CONT
Control Current
V = 1.8 V, Output ON
CONT
12 40
µA
VCONT(ON) Control Voltage ON
Output ON
VCC-2.0
V
VCONT(OFF) Control Voltage OFF
Output OFF
VCC-0.5
V
Note 1: When mounted as recommended. Derate at 4.8 mw/°C for SOT-23L and 6.4 mw/°C for SOT-89 packages for operation above 25 °C.
Note 2: Refer to “Definition of Terms.”
Note 3: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used.
Note 4: Output noise voltage can be reduced by connecting a capacitor to a noise pass terminal.
Gen Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Gen Note: For Line Regulation, typ. and max. is changed to VOUT > 5.6 V.
February 2001 TOKO, Inc.
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VOLTAGE REGULATOR

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TK113xxBM/U
TK113xxBM/UC ELECTRICAL CHARACTERISTICS TABLE 1
Test conditions: TA = 25 °C, IOUT = 30 mA, unless otherwise specified.
Output
Voltage
2.0 V
2.1 V
2.2 V
2.3 V
2.4 V
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 V
3.6 V
Voltage
Code
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
VOUT(MIN)
1.940 V
2.040 V
2.140 V
2.240 V
2.340 V
2.440 V
2.540 V
2.640 V
2.740 V
2.840 V
2.940 V
3.040 V
3.140 V
3.240 V
3.335 V
3.435 V
3.535 V
VOUT(MAX)
2.060 V
2.160 V
2.260 V
2.360 V
2.460 V
2.560 V
2.660 V
2.760 V
2.860 V
2.960 V
3.060 V
3.160 V
3.260 V
3.360 V
3.465 V
3.565 V
3.665 V
Test
Voltage
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 V
3.6 V
3.7 V
3.8 V
3.9 V
4.0 V
4.1 V
4.2 V
4.3 V
4.4 V
4.5 V
4.6 V
Output
Voltage
3.7 V
3.8 V
3.9 V
4.0 V
4.1 V
4.2 V
4.3 V
4.4 V
4.5 V
4.6 V
4.7 V
4.8 V
4.9 V
5.0 V
5.5 V
6.0 V
8.0 V
Voltage
Code
37
38
39
40
41
42
43
44
45
46
47
48
49
50
55
60
80
VOUT(MIN)
3.630 V
3.725 V
3.825 V
3.920 V
4.020 V
4.120 V
4.215 V
4.315 V
4.410 V
4.510 V
4.605 V
4.705 V
4.800 V
4.900 V
5.390 V
5.880 V
7.840 V
VOUT(MAX)
3.770 V
3.875 V
3.975 V
4.080 V
4.180 V
4.280 V
4.385 V
4.485 V
4.590 V
4.690 V
4.795 V
4.895 V
5.000 V
5.100 V
5.610 V
6.120 V
8.160 V
Test
Voltage
4.7 V
4.8 V
4.9 V
5.0 V
5.1 V
5.2 V
5.3 V
5.4 V
5.5 V
5.6 V
5.7 V
5.8 V
5.9 V
6.0 V
6.5 V
7.0 V
9.0 V
Page 4
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VOLTAGE REGULATOR

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TK113xxBM/U
TK113xxBM/UI ELECTRICAL CHARACTERISTICS TABLE 2
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 30 mA, unless otherwise specified.
Output
Voltage
Voltage
Code
Room Temp. Range (T = 25 °C)
A
VOUT(MIN)
VOUT(MAX)
Full Temp. Range (T = -40 to +85 °C)
A
VOUT(MIN)
VOUT(MAX)
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 V
3.6 V
3.7 V
3.8 V
3.9 V
4.0 V
4.1 V
4.2 V
4.3 V
4.4 V
4.5 V
4.6 V
4.7 V
4.8 V
4.9 V
5.0 V
5.5 V
6.0 V
8.0 V
25
2.440 V
2.560 V
2.400 V
2.600 V
26
2.540 V
2.660 V
2.500 V
2.700 V
27
2.640 V
2.760 V
2.600 V
2.800 V
28
2.750 V
2.860 V
2.700 V
2.900 V
29
2.840 V
2.960 V
2.800 V
3.000 V
30
2.940 V
3.060 V
2.900 V
3.100 V
31
3.040 V
3.160 V
3.000 V
3.200 V
32
3.140 V
3.260 V
3.095 V
3.305 V
33
3.240 V
3.360 V
3.190 V
3.410 V
34
3.335 V
3.465 V
3.290 V
3.510 V
35
3.435 V
3.565 V
3.385 V
3.615 V
36
3.535 V
3.665 V
3.485 V
3.720 V
37
3.630 V
3.770 V
3.580 V
3.820 V
38
3.725 V
3.875 V
3.675 V
3.925 V
39
3.825 V
3.975 V
3.770 V
4.030 V
40
3.920 V
4.080 V
3.870 V
4.130 V
41
4.020 V
4.180 V
3.965 V
4.235 V
42
4.120 V
4.280 V
4.060 V
4.335 V
43
4.215 V
4.385 V
4.160 V
4.440 V
44
4.315 V
4.485 V
4.255 V
4.545 V
45
4.410 V
4.590 V
4.350 V
4.645 V
46
4.510 V
4.690 V
4.450 V
4.750 V
47
4.605 V
4.795 V
4.545 V
4.850 V
48
4.705 V
4.895 V
4.640 V
4.955 V
49
4.800 V
5.000 V
4.740 V
5.060 V
50
4.900 V
5.100 V
4.835 V
5.165 V
55
5.390 V
5.610 V
5.320 V
5.680 V
60
5.880 V
6.120 V
5.805 V
6.195 V
80
7.840 V
8.160 V
7.745 V
8.265 V
February 2001 TOKO, Inc.
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VOLTAGE REGULATOR

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TK113xxBM/U
VIN
+
IIN
SOT23L
TEST CIRCUITS
+
1 µF
VIN
VOUT
2.2 µF
IOUT
VOUT
VOUT
SOT89
IOUT
VOUT
+
2.2 µF
VIN
IIN
+
1.0 µF
+
VIN
VCONT +
CONT
ICONT
NOISE
BYPASS
CN
0.1 µF
TRANSIENT RESPONSE
VIN
CONT
RS
1 µF
113XXB
CN
0.1 µF
VOUT
CL = 10 µF to 0.22 µF
NOISE
BYPASS
CN
0.1 µF
CONT
ICONT
Note: Connect pin 5 to
ground for heat sink
+
VCONT 1
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
OUTPUT VOLTAGE RESPONSE
(OFFON)
CL = 2.2 µF
LOAD REGULATION
VOUT(TYP)
SHORT CIRCUIT CURRENT
5
4
CN = 0.01 µF
3
CN = 0.1 µF
ILOAD = 30 mA
0 200 400 600 800
TIME (µs)
2
1
0
50
0
100 0
150 300
IOUT (mA)
IOUT (mA)
OUTPUT VOLTAGE VS. INPUT
VOLTAGE
VOUT(TYP)
IOUT = 0 mA
IOUT = 30 mA
IOUT = 50 mA
IOUT = 90 mA
LINE REGULATION
VOUT(TYP)
DROPOUT VOLTAGE VS. OUTPUT
CURRENT
0
-100
-200
-300
-400
0 VIN = VOUT
VIN (V) (50 mV/DIV)
Page 6
0
10
20 0
100 200
VIN (V)
IOUT (mA)
February 2001 TOKO, Inc.


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VOLTAGE REGULATOR

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TK113xxBM/U
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
GROUND CURRENT VS. OUTPUT
CURRENT
10
8
6
4
2
0 0 100 200
IOUT (mA)
QUIESCENT CURRENT (ON
MODE) VS. INPUT VOLTAGE
2 IOUT = 0 mA
VOUT =
1 3V
5V
2V 4V
0
05
VIN (V )
10
REVERSE BIAS CURRENT
(VIN = 0 V)
500
400
300
200
100
0
0
10
VREV (V)
20
QUIESCENT CURRENT
2
IOUT = 60 mA
1
0
-50
IOUT = 30 mA
0 50
TA (°C)
100
QUIESCENT CURRENT (OFF
MODE) VS. INPUT VOLTAGE
100
50
0
0 10 20
VIN (V)
DROPOUT VOLTAGE
500
400
IOUT = 150 mA
300
200 IOUT = 60 mA
100
0
-50
IOUT = 30 mA
0 50
TA (°C)
100
CONTROL CURRENT
50
40 VCONT = 5 V
30
20
10
0
-50
VCONT = 1.8 V
0 50
TA (°C)
100
February 2001 TOKO, Inc.
VCONT (VOUT, ON POINT)
2.0 RCONT = 0
1.0
0
-50 0
50 100
TA (°C)
MAXIMUM OUTPUT CURRENT
VOUT = 2.7 V
280
VOUT = 2 to 2.6 V
270
260
250
240
-50
0 50
TA (°C)
100
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VOLTAGE REGULATOR

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TK113xxBM/U
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
OUTPUT VOLTAGE VARIATION
10
VOUT = 2 V
0
-10 3 V
5V
-20
4V
-30
-50
0 50
TA (°C)
100
LINE VOLTAGE STEP RESPONSE
VOUT +2 V
VOUT +1 V
CN = 0.001 µF, CL = .22 µF
LOAD CURRENT STEP RESPONSE
100 mA
50 mA
CN = 0.01 F, CL = 2.2 µF
CN = 0.01 µF, CL = 2.2 µF
TIME (50 µs/DIV)
CN = 0.1 F, CL = 10 µF
TIME (50 µs/DIV)
NOISE SPECTRUM
0
-50
-100
0
CL = 3.3 µF, CN = NONE
CL = 3.3 µF, CN = 0.1 µF
SPECTRUM ANALYZER BACK-
GROUND NOISE
500 k
f (Hz)
1M
NOISE LEVEL VS. CN
250
VOUT = 3 V
IOUT = 60 mA
200
CL = 2.2 µF
150 CL = 3.3µF
100 CL = 10 µF
50
0
1 PF 10
100 1000 .01 µF .1
CN
RIPPLE REJECTION
0
I OUT = 30 mA
-20
-40
CN = 0.1 µF
-60
CN = 0.01 µF
-80
-100
0.01 0.1
1 10
f (kHz)
100
Page 8
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VOLTAGE REGULATOR

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TK113xxBM/U
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (VOUT)
The output voltage is specified with VIN = (VOUT(TYP) + 1 V)
and IOUT = 30 mA.
DROPOUT VOLTAGE (VDROP)
The dropout voltage is the difference between the input
voltage and the output voltage at which point the regulator
starts to fall out of regulation. Below this value, the output
voltage will fall as the input voltage is reduced. It is
dependent upon the load current and the junction
temperature.
OUTPUT CURRENT (IOUT(MAX))
This is the maximum continuous output current as specified
under the condition where the output voltage drops 0.3 V
below the value specified with IOUT = 30 mA. The input
voltage is set to VOUT +1 V, and the current is pulsed to
minimize temperature effect.
CONTINUOUS OUTPUT CURRENT (IOUT)
Normal operating output current. This is limited by package
power dissipation.
PULSE OUTPUT CURRENT (IOUT(PULSE))
Max pulse width 5 ms, Duty cycle 12.5%: pulse load only.
LINE REGULATION (Line Reg)
Line regulation is the ability of the regulator to maintain a
constant output voltage as the input voltage changes. The
line regulation is specified as the input voltage is changed
from VIN = VOUT(TYP) + 1 V to VIN = VOUT(TYP) + 6 V.
LOAD REGULATION (Load Reg)
Load regulation is the ability of the regulator to maintain a
constant output voltage as the load current changes. It is
a pulsed measurement to minimize temperature effects
with the input voltage set to VIN = VOUT +1 V. The load
regulation is specified under two output current step
conditions of 1 mA to 60 mA and 1 mA to 100 mA.
QUIESCENT CURRENT (IQ)
The quiescent current is the current which flows through
the ground terminal under no load conditions (IOUT = 0 mA).
GROUND CURRENT (IGND)
Ground current is the current which flows through the
ground pin(s). It is defined as IIN - IOUT, excluding control
current.
RIPPLE REJECTION RATIO (RR)
Ripple rejection is the ability of the regulator to attenuate
the ripple content of the input voltage at the output. It is
specified with 100 mVrms, 400 Hz superimposed on the
input voltage, where VIN = VOUT + 1.5 V. The output
decoupling capacitor is set to 10 µF, the noise bypass
capacitor is set to 0.1 µF, and the load current is set to 30
mA. Ripple rejection is the ratio of the ripple content of the
output vs. the input and is expressed in dB.
STANDBY CURRENT (ISTBY)
Standby current is the current which flows into the regulator
when the output is turned off by the control function
(VCONT = VIN). It is measured with VIN = 8 V (9 V for the
8 V output device).
SENSOR CIRCUITS
Overcurrent Sensor
The overcurrent sensor protects the device in the event
that the output is shorted to ground.
Thermal Sensor
The thermal sensor protects the device in the event that
the junction temperature exceeds the safe value (Tj = 150
°C). This temperature rise can be caused by external heat,
excessive power dissipation caused by large input to
output voltage drops, or excessive output current. The
regulator will shut off when the temperature exceeds the
safe value. As the junction temperatures decrease, the
regulator will begin to operate again. Under sustained fault
conditions, the regulator output will oscillate as the device
turns off then resets. Damage may occur to the device
under extreme fault conditions.
February 2001 TOKO, Inc.
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TK113xxBM/U
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
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.
CONTROL CURRENT
If the control function is not used, connect the control
terminal to VIN. When the control function is used, the
control current can be reduced by inserting a series
resistor (RCONT) between the control terminal and VIN. The
value of this resistor should be determined from the graph
below.
CONTROL PIN CURRENT VS.
VOLTAGE
50
40 VOUT
VIN
RCONT = 0
30
20
SW RC
CN
10
0 RCONT =100K
0 1 2 3 45
VCONT (V)
Note: VCONT = differential voltage from VIN pin to VCONT pin.
SOT23L
VIN
The requirement for the pullup resistor (RPULLUP) is deter-
mined by the external control circuitry. For example, open
collector/open drain logic may require R
over tem-
PULLUP
perature; CMOS logic will not require RPULLUP.
CN RC SW
Page 10
SOT89
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TK113xxBM/U
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
ON/OFF RESPONSE WITH CONTROL AND LOAD TRANSIENT RESPONSE
The turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. The turn-on time will
increase with the value of either capacitor. The graphs below shows the relationship between turn-on time and load
capacitance. If the value of these capacitors is reduced, the load and line regulation will suffer and the noise voltage will
increase. If the value of these capacitors is increased, the turn-on time will increase.
OUTPUT VOLTAGE RESPONSE
(OFFON)
ILOAD = 10 mA, CN = 1000 pF
CL = 0.33 µF
CL = 1.0 µF
CL = 1.5 µF
CL = 0.47 µF
-5 5 15 25 35 45
TIME (µs)
OUTPUT VOLTAGE RESPONSE
(OFFON)
CL = 2.2 µF
CN = 0.01 µF
CN = 0.1 µF
ILOAD = 30 mA
0 200 400 600 800
TIME (µs)
LOAD CURRENT STEP RESPONSE
ILOAD = 5 to 35 mA
30 to 60 mA
0 to 30 mA
CL = 0.33 µF
-5 5 15 25 35 45
TIME( µs)
REDUCTION OF OUTPUT NOISE
Although the architecture of the Toko regulators is designed to minimize semiconductor noise, further reduction can be
achieved by the selection of external components. The obvious solution is to increase the size of the output capacitor.
A more effective solution would be to add a capacitor to the noise bypass terminal. The value of this capacitor should
be 0.1 µf or higher (higher values provide greater noise reduction). Although stable operation is possible without the noise
bypass capacitor, this terminal has a high impedance and care should be taken to avoid a large circuit area on the printed
circuit board when the capacitor is not used. Please note that several parameters are affected by the value of the
capacitors and bench testing is recommended when deviating from standard values.
February 2001 TOKO, Inc.
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TK113xxBM/U
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
PACKAGE POWER DISSIPATION (PD)
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 (VIN x IIN)
and the output power (VOUT x IOUT) 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-23L is increased to 600 mW. For operation at
ambient temperatures over 25 °C, the power dissipation of
the SOT-23L device should be derated at 4.8 mW/°C. The
power dissipation of the SOT-89 package is 900 mW when
mounted as recommended. Derate the power dissipation
at 7.2 mW/°C for operation above 25 °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 PD /(150 °C - TA) 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:
Tj = 0jA x PD + TA
For Toko ICs, the internal limit for junction temperature is
150 °C. If the ambient temperature (TA) is 25 °C, then:
the output side is shorted. Input current gradually falls as
temperature rises. You should use the value when thermal
equilibrium is reached.
The range of usable currents can also be found from the
graph below.
(mW)
PD
DPD
3
6
4
5
25 50 75
TA (°C)
150
Procedure:
1) Find PD
2) PD1 is taken to be PD x (~ 0.8 - 0.9)
3) Plot PD1 against 25 °C
4) Connect PD1 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 PD against the point at which the
vertical line intersects the derating curve. This is taken
as the maximum power dissipation, DPD.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
150 °C = 0jA x PD + 25 °C
0jA x PD = 125 °C
0jA = 125 °C/ PD
PD is the value when the thermal sensor is activated. A
simple way to determine PD is to calculate VIN x IIN when
Page 12
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TK113xxBM/U
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
750
600
MOUNTED AS
SHOWN
450
FREE AIR
300
1000
800
600
400
MOUNTED AS
SHOWN
FREE AIR
150
0
0 50 100 150
TA (°C)
SOT23L POWER DISSIPATION CURVE
200
0
0 50 100 150
TA (°C)
SOT89 POWER DISSIPATION CURVE
VIN
+
VOUT
+
VOUT
+
VIN
+
VCONT
GND
SOT23L BOARD LAYOUT
VCONT
SOT89 BOARD LAYOUT
APPLICATION NOTE
Copper pattern should be as large as possible. Power dissipation is 600 mW for SOT23L and 900 mV for SOT89. A low
Equivalent Series Resistance (ESR) capacitor is recommended. For low temperature operation, select a capacitor with
a low ESR at the lowest operating temperature to prevent oscillation, degradation of ripple rejection and increase in noise.
The minimum recommended capacitance is 2.2 µF.
February 2001 TOKO, Inc.
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TK113xxBM/U
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require an output capacitor in order to maintain regulator loop stability. This capacitor should be selected
to ensure stable operation over the desired temperature and load range. The graphs below show the effects of
capacitance value and ESR on the stable operation area.
VOUT =
113xxB
CL
2.0 V
3.0 V
5.0 V
ESR
CL = 1 µF
1000
100
10
STABLE
OPERATION
AREA
1
CL = 2.2 µF
1000
100
10
STABLE
OPERATION
AREA
1
CL = 3.3 µF
1000
100
10
STABLE
OPERATION
AREA
1
CL = 10 µF
1000
100
10
STABLE
OPERATION
AREA
1
0.1 0 . 1 0.1 0.1
0 .01
1
50 100
IOUT (mA)
0.01
150 1
50 100
IOUT (mA)
150
0.01
1
50 100
IOUT (mA)
150
0.01
1
50 100
IOUT (mA)
150
In general, the capacitor should be at least 1 µF (aluminum electrolytic) and be rated for the actual ambient operating
temperature range. The table below shows typical characteristics for several types and values of capacitance. Please
note that the ESR varies widely depending upon manufacturer, type, size, and material.
Page 14
ESR
Capacitance
1.0 µF
2.2 µF
3.3 µF
10 µF
Aluminum
Capacitor
2.4
2.0
4.6
1.4
Tantalum
Capacitor
2.3
1.9
1.0
0.5
Ceramic
Capacitor
0.140
0.059
0.049
0.025
Note: ESR is measured at 10 kHz.
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NOTES
TK113xxBM/U
February 2001 TOKO, Inc.
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VOLTAGE REGULATOR

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TK113xxBM/U
PACKAGE OUTLINE
SOT23L-6
+0.15
- 0.05
0.4
0.1 M
6
Marking
XXQ
Voltage Code
1
23
e
0.95
e
0.95
Product Code
+0.15
- 0.05
0.32 0.1 M
5 PL
0.6
e 0.95 e 0.95
Recommended Mount Pad
Note: Pin 2 and Pin 5 should be
grounded for heat dissipation
SOT89-5
+0.3
3.5 - 0.1
(3.4)
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
0.49 max
6
4.5
1.6
0.49 max
0.49 max
5
4
2.2
± 0.3
3.3
0.44 max
Lot Code
Product Code
Numeric Code
1
0.49 max
23
0.54 max
e 1.5
e 1.5
e' 3.0
0.49 max
0.44 max
0.7 max
1.0
0.7 max
0.4± 0.2
Marking Information
Product Code
Q
TK11320B
TK11321B
TK11322B
TK11323B
TK11324B
TK11325B
TK11326B
TK11327B
TK11328B
TK11329B
TK11330B
TK11331B
TK11332B
TK11333B
TK11334B
TK11335B
TK11336B
TK11337B
TK11338B
TK11339B
TK11340B
TK11341B
TK11342B
TK11343B
TK11344B
TK11345B
TK11346B
TK11347B
TK11348B
TK11349B
TK11350B
TK11355B
TK11360B
TK11380B
Voltage Code
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
55
60
80
45 °
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
e 1.5
2.0
e 1.5
Recommended Mount Pad
Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: (847) 297-0070 Fax: (847) 699-7864
TOKO AMERICA REGIONAL OFFICES
Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: (847) 297-0070
Fax: (847) 699-7864
Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: (408) 432-8281
Fax: (408) 943-9790
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
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.
Page 16
© 1999 Toko, Inc.
All Rights Reserved
IC-214-TK113B
0798O0.0K
February 2001 TOKO, Inc.
Printed in the USA




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