TK11232B (TOKO)
VOLTAGE REGULATOR

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TK112xxB
VOLTAGE REGULATOR WITH ON/OFF SWITCH
FEATURES
s High Voltage Precision at ± 2.0%
s Active High On/Off Control
s Very Low Dropout Voltage 80 mV at 30 mA
s Very Low Noise
s Very Small SOT-23L or SOT-89-5 Surface Mount
Packages
s Internal Thermal Shutdown
s Short Circuit Protection
DESCRIPTION
The TK112xxB is a low dropout linear regulator with a built-
in electronic switch. The internal switch can be controlled
by TTL or CMOS logic levels. The device is in the ON state
when the control pin is pulled to a logic high 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
TK112xxB 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 shutdown circuitry
limits the junction temperature to below 150 °C. The load
current is internally monitored and the device will shutdown
in the presence of a short circuit or overcurrent condition at
the output.
ORDERING INFORMATION
TK112 B C
Voltage Code
Tape/Reel Code
Package Code
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 TK112xxB is available in either 6 pin SOT-23L or 5 pin
SOT-89-5 surface mount packages.
TK112XXB
CONTROL 1
6 VIN
20P
GND 2
5 GND
NOISE
BYPASS
3
4 VOUT
NOISE
BYPASS 1
GND 2
CONTROL 3
6 VOUT
5 GND
4 VIN
BLOCK DIAGRAM
VOLTAGE CODE
13 = 1.3 V 33 = 3.3 V
14 = 1.4 V 34 = 3.4 V
15 = 1.5 V 35 = 3.5 V
16 = 1.6 V 36 = 3.6 V
17 = 1.7 V 37 = 3.7 V
18 = 1.8 V 38 = 3.8 V
19 = 1.9 V 39 = 3.9 V
20 = 2.0 V 40 = 4.0 V
21 = 2.1 V 41 = 4.1 V
22 = 2.2 V 42 = 4.2 V
23 = 2.3 V 43 = 4.3 V
24 = 2.4 V 44 = 4.4 V
25 = 2.5 V 45 = 4.5 V
26 = 2.6 V 46 = 4.6 V
27 = 2.7 V 47 = 4.7 V
28 = 2.8 V 48 = 4.8 V
29 = 2.9 V 49 = 4.9 V
30 = 3.0 V 50 = 5.0 V
31 = 3.1 V 55 = 5.5 V
32 = 3.2 V 80 = 8.0 V
NOTE:
1.3 V to 1.9 V available in
the SOT-23L package only
PACKAGE CODE
M: SOT-23L
U: SOT-89-5
TAPE/REEL CODE
L : Tape Left
(SOT-23L)
B : Tape Bottom
(SOT-89-5)
VIN
CONTROL S S
S
S SS
THERMAL
PROTECTION
S+
S
S
S
S
SS
BANDGAP
REFERENCE
SS
S
+
NOISE BYPASS
S VOUT
S
S GND
May, 1997 TOKO, Inc.
Page 1


TK11232B (TOKO)
VOLTAGE REGULATOR

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TK112xx B
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................... 16 V
Output Current .................................................... 260 mA
Power Dissipation ............................................... (Note 1)
SOT-23L ......................................................... 600 mW
SOT-89-5 ....................................................... 900 mW
Reverse Bias ............................................................ 10 V
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-30 to +80 °C
Voltage Range ............................................ 1.8 to 14.5 V
Junction Temperature ........................................... 150 °C
TK112XXB ELECTRICAL CHARACTERISTICS
Test conditions: TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
IQ
ISTBY
VO
Line Reg
Load Reg
VDROP
IOUT
RR
Quiescent Current
Standby Current
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
Continuous Output Current
Ripple Rejection
IOUT = 0 mA, Except ICONT
VIN = 8 V, at output off
IOUT = 30 mA
VO 5.5 V (Note 2)
IOUT = 1 mA 60 mA (Note 3)
IOUT = 1 mA 100 mA (Note 3)
IOUT = 60 mA
IOUT when VOUT drops 0.3 V
from VO (typ) (Note 3)
f = 400 Hz, CL= 10 µF, CN = 0.1 µF
VIN = VOUT + 1.5 V, IOUT = 30 mA,
(Note 4)
170 250
0.1
See table 1
3.0 20
6 30
18 90
0.12 0.24
150
µA
µA
V
mV
mV
mV
V
mA
55 dB
VNO
Output Noise Voltage
10 Hz f 80 KHz,
VCN = VOUT + 1.5 V, IOUT = 60 mA,
CL = 10 µF, CN = 0.1 µF, (Notes 4,5)
30
µVrms
IOUT (PULSE) Pulse Output Current
5 ms pulse, 12.5% duty cycle
VREF
Noise Bypass Terminal Voltage
Control Terminal Specification
200 mA
1.25 V
ICONT
VCONT
VO/TA
Control Current
Control Voltage
Output on, VCONT = 1.8 V
Output on
Output off
Output Voltage Temperature IOUT = 10 mA
Coefficient
12
1.8
0.09
35 µA
V
0.6 V
mV/°C
Note 1: When mounted as recommended. Derate at 4.8 mW/°C for SOT-23L and 6.4 mW/°C for SOT-89-5 packages when ambient
temperatures are over 25 °C.
Note 2: For Line Regulation VO > 5.6 V, Typ and Max values are 15 and 40 mV.
Note 3: Refer to Definition of Terms.
Note 4: Ripple Rejection and noise voltage are affected by the value and characteristics of the capacitor used.
Note 5: 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
May, 1997 TOKO, Inc.


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VOLTAGE REGULATOR

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TK112xxB ELECTRICAL CHARACTERISTICS (Table 1)
TK112xxB
Output
Voltage
1.3 V
1.4 V
1.5 V
1.6 V
1.7 V
1.8 V
1.9 V
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
Voltage
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
VOUT Min
1.24 V
1.34 V
1.44 V
1.54 V
1.64 V
1.74 V
1.84 V
1.94 V
2.04 V
2.14 V
2.24 V
2.34 V
2.44 V
2.54 V
2.64 V
2.74 V
2.84 V
2.94 V
3.04 V
3.14 V
3.24 V
3.335 V
3.435 V
3.535 V
VOUT Max
1.36 V
1.46 V
1.56 V
1.66 V
1.76 V
1.86 V
1.96 V
2.06 V
2.16 V
2.26 V
2.36 V
2.46 V
2.56 V
2.66 V
2.76 V
2.86 V
2.96 V
3.06 V
3.16 V
3.26 V
3.36 V
3.465 V
3.565 V
3.665 V
Test
Voltage
2.4 V
2.4 V
2.4 V
2.4 V
2.4 V
2.4 V
2.4 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
Output
Voltage
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.5
8.0
Voltage
Code
37
38
39
40
41
42
43
44
45
46
47
48
49
50
55
80
VOUT Min
3.630
3.725
3.825
3.920
4.020
4.120
4.215
4.315
4.410
4.510
4.605
4.705
4.800
4.900
5.390
7.840
VOUT Max
3.770
3.875
3.975
4.080
4.180
4.280
4.385
4.485
4.590
4.690
4.795
4.895
5.000
5.100
5.610
8.160
Test
Voltage
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6.0
6.5
9.0
May, 1997 TOKO, Inc.
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TK11232B (TOKO)
VOLTAGE REGULATOR

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TK112xx B
VIN +
_
IIN
AS
+
1 µF
TEST CIRCUITS
SOT-23L
VIN
65
S
+
VOUT
4
S
2.2 µF IO
VO
V
VIN
V
S
IO
SOT-89-5
VO
S
+
2.2 µF
VIN
65 4
IIN
SA
+
1.0 µF
+
_
VIN
VCONT
+
_
S
V
123
CONT
A
Noise Bypass
0.1 µF
ICONT
Transient Response
V
IN
Cont
112XXB
Rs
+
1 µF
C+
P
0.1 µF
V
OUT
C = 10 µF
L to 0.22
NOISE
BYPASS 1 2 3 CONT
0.1 µF
ICONT
A
•Connect pin 5 to
ground for heat sink
S
V
+
_ VCONT
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT VOLTAGE RESPONSE
(OFFON)
TA = 25 °C unless otherwise specified
LOAD REGULATION
SHORT CIRCUIT CURRENT
CL = 2.2 µF
VO (5 mV/Div)
5
Cn = 0.01 µF
4
3
Cn = 0.1 µF
ILOAD = 30 mA
T=0 200 400 600 800
TIME ( µS)
2
1
0
0
50 100
0
150 300
IOUT (mA)
IO (mA)
OUTPUT VOLTAGE vs. INPUT
VOLTAGE
VOUT (25mV/Div)
VO TYP
IO = 0 mA
IO = 30 mA
IO = 50 mA
IO = 90 mA
LINE REGULATION
50 mV/Div
VO TYP
0
-100
-200
-300
-400
OUTPUT CURRENT vs.
DROPOUT VOLTAGE
0 VIN = VOUT
Page 4
VIN (V)
(50 mV/Div)
0 10 20
VIN (V)
0 100 200
IO (mA)
May, 1997 TOKO, Inc.


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VOLTAGE REGULATOR

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TK112xxB
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C unless otherwise specified
OUTPUT CURRENT vs.
QUIESCENT CURRENT
REVERSE BIAS CURRENT
(VIN = 0 V)
VIN vs. QUIESCENT CURRENT
(OFF MODE)
10 500 100
1.9 V
8 400
6 300
2.0 V
50
4 200 1.3 V
2 100
00
0 100 200 0
0
10 20 0
10 20
IO (mA)
VREV (V)
VCC (V)
VIN vs. QUIESCENT CURRENT
(ON MODE)
2 IO = 0 mA
VO =
1 3V
5V
2V 4V
VO = 1.3 to 1.8 V
0
0 5 10
VIN (V )
VIN vs. QUIESCENT CURRENT
(ON MODE)
1.0 IO = 0 mA
VO
VO = 1.9 V
0.5
0 VO = 1.3 to 1.8 V
0 2.5 5
VIN (V )
QUIESCENT CURRENT
2
IO = 60 mA
1
0
-50
IO = 30 mA
0 50
TA (°C)
100
DROPOUT VOLTAGE
500
400
300
200
100
0
-50
IO = 150 mA
IO = 60 mA
IO = 30 mA
0 50
TA (°C)
100
May, 1997 TOKO, Inc.
CONTROL CURRENT
50
40
30
20
10
0
-50
VCONT = 5 V
VCONT = 1.8 V
0 50
TA (°C)
100
VCONT (VOUT, ON POINT)
2.0 RC = 0 V
1.0
0
-50
0 50
TA (°C)
100
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VOLTAGE REGULATOR

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TK112xx B
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C unless otherwise specified
MAXIMUM OUTPUT CURRENT
OUTPUT VOLTAGE VARIATION
LINE VOLTAGE STEP RESPONSE
280
270
260
250
240
-50
VOUT = 2.7 V
VOUT = 2 to 2.6 V
VOUT = 1.9 V
VOUT = 1.3 V
0 50
TA (°C)
100
10
2V
0
-10 3 V
5V
-20
4V
-30
-50
0 50
TA (°C)
100
VO +2
50 µs/Div
VO +1
VIN
Cn = 0.001, CL = .22 µF
VOUT 10 mV/Div
Cn = 0.01, CL = 2.2 µF
IOUT
LOAD CURRENT STEP
RESPONSE
100 mA
50 µs/Div
50 mA
VOUT
Cn = 0.01, CL = 2.2 µF
50 mV/Div
Cn = 0.1, CL = 10 µF
NOISE SPECTRUM
0
-50
-100
0
CL = 3.3 µF, Cn = None
CL = 3.3 µF, Cn = 0.1 µF
Spectrum Analyzer Background Noise
500 k
Frequency (Hz)
1M
NOISE LEVEL vs. CN
250
200
150
CL = 3.3 µF
VO = 3 V
IO = 60 mA
CL = 2.2 µF
100 CL = 10 µF
50
0
1 pF 10
100 1000 .01 µF .1
Cn
Page 6
May, 1997 TOKO, Inc.


TK11232B (TOKO)
VOLTAGE REGULATOR

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TK11213B
TK112xxB
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
VIN vs VOUT
TA = 25 °C unless otherwise specified
IOUT vs VOUT
1.3 IO = 0 mA
30 mA
60 mA
1.2
150 mA
90 mA
1.1 120 mA
1.6 1.7 1.8 1.9 2.0 2.1
VIN (V)
1.3
1.9 V
1.2 VIN = 1.8 V
2.1 V
2.4 V
1.1
0
2.0 V
100 200
IO (mA)
300
TK11214B
VIN vs VOUT
IOUT vs VOUT
1.4 IO = 0 mA
30 mA
60 mA
1.3
90 mA
150 mA
1.2 120 mA
1.6 1.7
1.8 1.9
VIN (V)
2.0
2.1
TK11215B
VIN vs VOUT
1.4
1.9 V
1.3 VIN = 1.8 V
2.1 V
2.4 V
1.2
0
2.0 V
100 200
IO (mA)
300
IOUT vs VOUT
1.5
IO = 0 mA
30 mA
60 mA
1.4
150 mA
120 mA
1.3 90 mA
1.6 1.7 1.8 1.9 2.0 2.1
VIN (V)
May, 1997 TOKO, Inc.
1.5
1.9 V
1.4 VIN = 1.8 V
2.1 V
2.4 V
1.3
0
2.0 V
100 200
IO (mA)
300
Page 7


TK11232B (TOKO)
VOLTAGE REGULATOR

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TK112xx B
TK11216B
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C unless otherwise specified
VIN vs VOUT
IOUT vs VOUT
1.6 IO = 0 mA
30 mA
60 mA
1.5
90 mA
150 mA
1.4 120 mA
1.6 1.7 1.8 1.9 2.0 2.1
VIN (V)
TK11217B
VIN vs VOUT
1.6
1.9 V
1.5 VIN = 1.8 V
2.4 V
2.1 V
1.4
0
2.0 V
100 200
IO (mA)
IOUT vs VOUT
300
1.7
IO = 0 mA
30 mA
60 mA
1.6
90 mA
150 mA
1.5 120 mA
1.6 1.7 1.8 1.9 2.0 2.1
VIN (V)
TK11218B
VIN vs VOUT
1.7
1.9 V
1.6
VIN = 1.8 V
2.4 V
2.1 V
2.0 V
1.5
0
100 200
IO (mA)
300
IOUT vs VOUT
1.8
IO = 0 mA
30 mA
1.7
90 mA 150 mA
60 mA
1.6 120 mA
1.7 1.8 1.9 2.0 2.1 2.2
VIN (V)
Page 8
1.8
1.9 V 2.0 V 2.1 V
2.4 V
1.7
VIN = 1.8 V
1.6
0 100 200
IO (mA)
300
May, 1997 TOKO, Inc.


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VOLTAGE REGULATOR

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TK112xxB
TK11219B
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
VIN vs VOUT
TA = 25 °C unless otherwise specified
IOUT vs VOUT
1.9
IO = 0 mA
1.8
1.9
2.0 V 2.1 V 2.2 V
2.4 V
1.8
30 mA
150 mA
1.7
90 mA
60 mA
120 mA
1.7 1.8 1.9 2.0 2.1
VIN (V)
2.2
VIN = 1.9 V
1.7
0 100 200
IO (mA)
300
May, 1997 TOKO, Inc.
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VOLTAGE REGULATOR

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TK112xx B
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (VO)
RIPPLE REJECTION RATIO
The output voltage is specified with VIN = (VO(TYP) + 1 V)
and IO = 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 tempera-
ture.
OUTPUT CURRENT (IO MAX)
The rated output current is specified under the condition
where the output voltage drops 0.3 V below the value
specified with IO = 30 mA. The input voltage is set to VO +1
V, and the current is pulsed to minimize temperature effect.
CONTINUOUS OUTPUT CURRENT (IO)
Normal operating output current. This is limited by package
power dissipation.
PULSE OUTPUT CURRENT (IO (PULSE))
Max pulsewidth 5ms, 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 = VO + 1V to VIN = VO + 6v.
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 = VO +1 V. The load
regulation is specified under two output current step condi-
tions 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 (IO = 0 mA).
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 = VO+ 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
Standby current is the current which flows into the regulator
when the output is turned off by the control function (VCONT
= 0 V). It is measured with VIN = 8 V (9 V for the 8 V output
device.)
SENSOR CIRCUIT
Over current 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 tempera-
ture exceeds the safe value. As the junction tempera-
tures 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.
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 capaci-
tor 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 10
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VOLTAGE REGULATOR

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TK112xxB
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
CONTROL FUNCTION
VIN
C
SW
65 4
64
VIN
C
SW
123
RC CNP
123
CNP
RC
SOT-23L
SOT-89-5
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 (Rc) between the control terminal and VIN. The value of this resitor should
be determined from the graph below.
CONTROL PIN VOLTAGE vs.
CURRENT
50
40 VOUT
30
20
RC = 0
10
0
01
RC =100k
23
VCONT (V)
4
5
May, 1997 TOKO, Inc.
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VOLTAGE REGULATOR

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TK112xx B
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 graph 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)
CL = 0.33
1.0 µF
1.5 µF
0.47 µF
-5 5 15 25 35 45
ILOAD = 10 mA, CNP = 1000 pF
OUTPUT VOLTAGE RESPONSE
(OFFON)
CN = 0.1 µF
CN = 0.1 µF
0 200 400 600 800
ILOAD = 30 mA, CL = 2.2 µF
LOAD CURRENT STEP
R20E0SPmOVN/DSIVE
B
C
A CL = 0.33 µF
-5 5 15 25 35 45
TIME( µS)
ILOAD
A = 0 to 30, B = 5 to 35, C = 30 to 60 mA
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.
Page 12
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VOLTAGE REGULATOR

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TK112xxB
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
INPUT-OUTPUT CAPACITORS
Linear regulators require an output capacitor in order to maintain regulator loop stability. This capacitor should be selected
to insure stable operation over the desired temperature and load range. The graphs below show the effects of capacitance
value and equivalent series resistance (ESR) on the stable operation area.
112xxB
CL
2.0 V
3.0 V
5.0 V
CL = 1 µF
1000
100
CL = 2.2 µF
1000
100
CL = 3.3 µF
1000
100
CL = 10 µF
1000
100
10
STABLE
OPERATION
AREA
1
10
STABLE
OPERATION
AREA
1
10
STABLE
OPERATION
AREA
1
10
STABLE
OPERATION
AREA
1
0.1 0.1
0.1
0.1
0 .01
Q1
50 100
IOUT (mA)
150 0.01
Q1
50 100
IOUT (mA)
0.01
Q1
150
50 100
IOUT (mA)
0.01
150 Q 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.
ESR AlumEinSuRm
Capacitor
Capacitance
Tantalum
Capacitor
ESR
1.0 µF
2.2
3.3
ES
10.0
2.4
2.0
4.6
1.4
2.3
1.9
1 .0
0.5
Note: ESR is measured at 10 KHz.
Ceramic
Capacitor
0.14
0.059
0.049
0.025
May, 1997 TOKO, Inc.
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VOLTAGE REGULATOR

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TK112xx B
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 shutdown. 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-89-5 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:
150 °C = 0JA X PD + 25 °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 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 currents usable can also be found from the graph below.
(mW)
PD
3
Dpd 6
4
5
Procedure:
25 50 75
150
1.) Find PD
T (°C)
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.
Page 14
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TK11232B (TOKO)
VOLTAGE REGULATOR

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The maximum operating current is:
IOUT = (DPD/(VIN(MAX) - VOUT).
VIN
+
VO
+
ON/OFF
GND
SOT-23L Board Layout
750
600 Mounted as shown
450
300
150
Unmounted
0
0 50 100
TA (°C)
150
SOT-23L Power Dissipation Curve
May, 1997 TOKO, Inc.
TK112xxB
VO VIN
++
ON/OFF
SOT-89-5 Board Layout
1.0
0.8
0.6
0.4
0.2
0
0
Mounted as
shown
Unmounted
50 100
TA (°C)
150
SOT-89-5 Power Dissipation Curve
APPLICATION HINTS
A
Copper pattern should be as large as possible. Power dissi-
pation is 600 mW for SOT-23L and 900 mV for SOT-89-5. A
low 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 recom-
mended capacitance is 2.2 µF.
Page 15


TK11232B (TOKO)
VOLTAGE REGULATOR

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TK112xx B
SOT-23L
PACKAGE OUTLINE
65
+ 0.15
- 0.05
0.4
4
0.1
M
Marking
0.6
Voltage Code
1
Product Code
2
e
0.95
3
e
0.95
+ 0.15
- 0.05
5-0.32
0.1
M
e 0.95 e 0.95
Recommended Mount Pad
(Pin 2 and pin 5 should be
grounded for heat dissipation)
+ 0.3
3.4 - 0.1
SOT-89-5
4.5
1.6
0.49max 0.49max 0.49max
65
4
± 0.2
2.2
3.3 ± 0.3
0.44max
Product Code
Voltage Code
1
0.49max
23
0.54max
e 1.5
e 1.5
e' 3.0
0.49max
0.44max
0.7max 1.0
0.7max
0.4 ± 0.2
45fl
Marking Information
Product Code
P
TK11213B
TK11214B
TK11215B
TK11216B
TK11217B
TK11218B
TK11219B
TK11220B
TK11221B
TK11222B
TK11223B
TK11224B
TK11225B
TK11226B
TK11227B
TK11228B
TK11229B
TK11230B
TK11231B
TK11232B
TK11233B
TK11234B
TK11235B
TK11236B
TK11237B
TK11238B
TK11239B
TK11240B
TK11241B
TK11242B
TK11243B
TK11244B
TK11245B
TK11246B
TK11247B
TK11248B
TK11249B
TK11250B
TK11255B
TK11280B
Voltage Code
13
14
15
16
17
18
19
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
80
e 1.5
2.0
e 1.5
Recommended Mount Pad
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.
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
Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: (203) 748-6871
Fax: (203) 797-1223
http://www.tokoam.com
Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: (719) 528-2200
Fax: (719) 528-2375
IC-215-TK112B
0597O2500
Page 16
© 1997 Toko, Inc.
All rights reserved
Printed in the USA
May, 1997 TOKO, Inc.




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