TOKO TK11123S

TK111xxS
VOLTAGE REGULATOR WITH ON/OFF SWITCH
FEATURES
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APPLICATIONS
High Voltage Precision at ± 2.0% or ± 60 mV
Active High On/Off Control
Very Low Dropout Voltage (85 mV at 30 mA)
Very Low Noise
Miniature Package (SOT-23-5)
Internal Thermal Shutdown
Short Circuit Protection
Excellent Ripple Rejection (70 dB @ 1 kHz)
Reverse Bias Protection
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Battery Powered Systems
Cellular Telephones
Pagers
Personal Communications Equipment
Portable Instrumentation
Portable Consumer Equipment
Radio Control Systems
Toys
DESCRIPTION
The TK111xxS is a low dropout linear regulator with a builtin 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.
TK111xxS
CONTROL
20 P
An internal PNP pass transistor is used to achieve a low
dropout voltage of 85 mV (typ.) at 30 mA load current. The
TK111xxS has a very low quiescent current of 140 µA
(typ.) at no load . The standby current is 100 nA maximum.
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.
GND
NOISE BYPASS
The TK111xxS is available in a miniature SOT-23-5 surface
mount package.
VIN
VOUT
BLOCK DIAGRAM
ORDERING INFORMATION
TK111
VIN
S L
THERMAL
PROTECTION
Tape/Reel Code
Temp. Code
Package Code
Voltage Code
VOUT
5
CONTROL
VOLTAGE CODE
20 = 2.0 V
21 = 2.1 V
22 = 2.2 V
23 = 2.3 V
24 = 2.4 V
25 = 2.5 V
27 = 2.7 V
28 = 2.8 V
29 = 2.9 V
30 = 3.0 V
31 = 3.1 V
32 = 3.2 V
33 = 3.3 V
34 = 3.4 V
35 = 3.5 V
36 = 3.6 V
37 = 3.7 V
38 = 3.8 V
39 = 3.9 V
40 = 4.0 V
41 = 4.1 V
42 = 4.2 V
Note 1: 2.0 to 2.3 V
43 = 4.3 V available in C
44 = 4.4 V temperature code
45 = 4.5 V (-30 to +80 °C) only
46 = 4.6 V
47 = 4.7 V
48 = 4.8 V
49 = 4.9 V
50 = 5.0 V
March 1999 TOKO, Inc.
TAPE/REEL CODE
L: Tape Left
PACKAGE CODE
S: SOT-23-5
BANDGAP
REFERENCE
GND
TEMP. CODE
C: -30 to +80 °C
I: -40 to +85 °C
NOISE
BYPASS
Page 1
TK111xxS
ABSOLUTE MAXIMUM RATINGS TK111xxSCL
Supply Voltage ......................................................... 16 V
Control Terminal Voltage ......................................... 12 V
Noise Bypass Terminal Voltage ................................. 5 V
Power Dissipation (Note 1) ................................ 500 mW
Reverse Bias ............................................................ 10 V
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-30 to +80 °C
Operating Voltage Range ............................... 1.8 to 12 V
Junction Temperature ........................................... 150 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
TK111xxSCL ELECTRICAL CHARACTERISTICS
Test conditions: VIN = VOUT(TYP) + 1 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
IQ
Quiescent Current
IOUT = 0 mA, Excluding ICONT
ISTBY
Standby Current
VIN = 6 V, Output OFF, VCONT ≤ 0.15 V
VOUT
Output Voltage
IOUT = 10 mA, VIN = VOUT(TYP) + 1 V
Line Reg
Line Regulation
VIN = VOUT(TYP) + 1 V to
VOUT(TYP) + 6 V, (Note 2)
Load Reg Load Regulation
MIN
TYP
MAX
UNITS
140
200
µA
0.1
µA
See Table 1
V
0.8
18
mV
IOUT = 1 to 60 mA, (Note 2)
8
30
mV
IOUT = 1 to 100 mA, (Note 2)
14
55
mV
120
200
mV
VDROP
Dropout Voltage
IOUT = 60 mA, (Note 2)
IOUT
Continuous Output Current
(Note 2)
100
mA
IOUT(PULSE)
Pulse Output Current
5 ms pulse, 12.5 % duty cycle, (Note
2)
130
mA
RR
Ripple Rejection
f = 1 kHz, CL = 4.7 µF,
CN = 0.1 µF, VIN = VOUT(TYP) + 2 V, VR =
200 mVrms, IOUT = 10 mA, (Notes
3,4)
70
dB
VNO
Output Noise Voltage
400 Hz ≤ f ≤ 80 kHz, CL = 4.7 µF,
CN = 0.01 µF, VIN = VOUT(TYP) + 2 V,
IOUT = 10 mA, (Notes 3,4)
30
µVrms
Vref
Noise Bypass Terminal
Voltage
1.25
V
∆VOUT /∆T
Temperature Coefficient
25
ppm/° C
IOUT = 10 mA
CONTROL TERMINAL SPECIFICATIONS
ICONT
Control Current
VCONT = 1.8 V, Output ON
VCONT(ON)
Control Voltage ON
Output ON
VCONT(OFF)
Control Voltage OFF
Output OFF
1.2
4
1.5
µA
V
0.35
V
Note 1: Power dissipation is 500 mW when mounted as recommended. Derate at 4.0 mW/°C 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 the noise bypass terminal.
Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Gen. Note: Exceeding the “Absolute Maximum Ratings” can damage the device.
Page 2
March 1999 TOKO, Inc.
TK111xxS
ABSOLUTE MAXIMUM RATINGS TK111xxSIL (VOUT ≥ 2.4 V)
Supply Voltage ......................................................... 15 V
Control Terminal Voltage ......................................... 12 V
Noise Bypass Terminal Voltage ................................. 5 V
Power Dissipation (Note 1) ................................ 500 mW
Reverse Bias ............................................................ 10 V
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ................... -40 to +85 °C
Operating Voltage Range ............................... 2.0 to 12 V
Junction Temperature ........................................... 150 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
TK111xxSIL ELECTRICAL CHARACTERISTICS (VOUT ≥ 2.4 V)
Test conditions: VIN = VOUT(TYP) + 1 V, TA = -40 to +85 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
IQ
Quiescent Current
IOUT = 0 mA, Excluding ICONT
ISTBY
Standby Current
VIN = 6 V, Output OFF, VCONT ≤ 0.15 V
VOUT
Output Voltage
IOUT = 10 mA, VIN = VOUT(TYP) + 1 V
Line Reg
Line Regulation
VIN = VOUT(TYP) + 1 V to
VOUT(TYP) + 6 V, (Note 2)
Load Reg Load Regulation
MIN
TYP
MAX
UNITS
140
200
µA
0.2
µA
See Table 2
V
0.8
18
mV
IOUT = 1 to 60 mA, (Note 2)
8
30
mV
IOUT = 1 to 100 mA, (Note 2)
14
55
mV
120
200
mV
VDROP
Dropout Voltage
IOUT = 60 mA, (Note 2)
IOUT
Continuous Output Current
(Note 2)
100
mA
IOUT(PULSE)
Pulse Output Current
5 ms pulse, 12.5 % duty cycle, (Note
2)
130
mA
RR
Ripple Rejection
f = 1 kHz, CL = 4.7 µF,
CN = 0.1 µF, VIN = VOUT(TYP) + 2 V, VR =
200 mVrms, IOUT = 10 mA, (Notes
3,4)
70
dB
VNO
Output Noise Voltage
400 Hz ≤ f ≤ 80 kHz, CL = 4.7 µF,
CN = 0.01 µF, VIN = VOUT(TYP) + 2 V,
IOUT = 10 mA, (Notes 3,4)
30
µVrms
Vref
Noise Bypass Terminal
Voltage
1.25
V
∆VOUT /∆T
Temperature Coefficient
25
ppm/° C
IOUT = 10 mA
CONTROL TERMINAL SPECIFICATIONS
ICONT
Control Current
VCONT = 1.8 V, Output ON
VCONT(ON)
Control Voltage ON
Output ON
VCONT(OFF)
Control Voltage OFF
Output OFF
1.2
6
1.5
µA
V
0.35
V
Note 1: Power dissipation is 500 mW when mounted as recommended. Derate at 4.0 mW/°C 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 the noise bypass terminal.
Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Gen. Note: Exceeding the “Absolute Maximum Ratings” can damage the device.
March 1999 TOKO, Inc.
Page 3
TK111xxS
TK111xxSCL ELECTRICAL CHARACTERISTICS TABLE 1
Output
Voltage
2.0 V
2.1 V
2.2 V
2.3 V
2.4 V
2.5 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
Page 4
Voltage
Code
20
21
22
23
24
25
27
28
29
30
31
32
33
34
35
VOUT(MIN)
VOUT(MAX)
1.940 V
2.040 V
2.140 V
2.240 V
2.340 V
2.440 V
2.640 V
2.740 V
2.840 V
2.940 V
3.038 V
3.136 V
3.234 V
3.232 V
3.430 V
2.060 V
2.160 V
2.260 V
2.360 V
2.460 V
2.560 V
2.760 V
2.860 V
2.960 V
3.060 V
3.162 V
3.264 V
3.366 V
3.468 V
3.570 V
Test
Voltage
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 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
Output
Voltage
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
Voltage
Code
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
VOUT(MIN)
VOUT(MAX)
3.528 V
3.626 V
3.724 V
3.822 V
3.920 V
4.018 V
4.116 V
4.214 V
4.312 V
4.410 V
4.508 V
4.606 V
4.704 V
4.802 V
4.900 V
3.672 V
3.774 V
3.876 V
3.978 V
4.080 V
4.182 V
4.284 V
4.386 V
4.488 V
4.590 V
4.692 V
4.794 V
4.896 V
4.988 V
5.100 V
Test
Voltage
4.6 V
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
March 1999 TOKO, Inc.
TK111xxS
TK111xxSIL ELECTRICAL CHARACTERISTICS TABLE 2
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 30 mA, unless otherwise specified.
Output
Voltage
Voltage
Code
2.4 V
2.5 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
24
25
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
March 1999 TOKO, Inc.
Room Temp. Range (TA = 25 °C)
VOUT(MIN)
VOUT(MAX)
2.340 V
2.440 V
2.640 V
2.740 V
2.840 V
2.940 V
3.038 V
3.136 V
3.234 V
3.332 V
3.430 V
3.528 V
3.626 V
3.724 V
3.822 V
3.920 V
4.018 V
4.116 V
4.214 V
4.312 V
4.410 V
4.598 V
4.696 V
4.794 V
4.892 V
4.900 V
2.460 V
2.560 V
2.760 V
2.860 V
2.960 V
3.060 V
3.162 V
3.264 V
3.366 V
3.468 V
3.570 V
3.672 V
3.774 V
3.876 V
3.988 V
4.080 V
4.182 V
4.284 V
4.366 V
4.488 V
4.590 V
4.692 V
4.794 V
4.896 V
4.998 V
5.100 V
Full Temp. Range (TA = -40 to +85 °C)
VOUT(MIN)
VOUT(MAX)
2.305 V
2.405 V
2.605 V
2.705 V
2.805 V
2.905 V
3.007 V
3.104 V
3.201 V
3.298 V
3.395 V
3.492 V
3.589 V
3.686 V
3.783 V
3.880 V
3.977 V
4.074 V
4.171 V
4.268 V
4.365 V
4.462 V
4.559 V
4.656 V
4.753 V
4.850 V
2.495 V
2.595 V
2.795 V
2.895 V
2.995 V
3.095 V
3.193 V
3.296 V
3.400 V
3.502 V
3.605 V
3.708 V
3.811 V
3.914 V
4.017 V
4.120 V
4.223 V
4.326 V
4.429 V
4.532 V
4.635 V
4.738 V
4.841 V
4.944 V
5.047 V
5.150 V
Page 5
TK111xxS
TEST CIRCUIT
VIN
VIN
IIN
VOUT
CIN
1 µF
CONT
CL
2.2 µF
TANTALUM
ESR = 1.6 Ω
IOUT
NOISE BYPASS
CN = 0.0047 µF
ICONT
VCONT
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
LOAD REGULATION
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
SHORT CIRCUIT CURRENT
VOUT TYPICAL
VOUT (25 mV/ DIV)
VOUT (5 mV/ DIV)
5
4
VOUT (V)
VOUT TYPICAL
3
2
IOUT = 0 mA
IOUT = 30 mA
IOUT = 60 mA
IOUT = 90 mA
1
0
0
50
100
0
IOUT (mA)
150
300
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
LINE REGULATION
0
10
-100
8
-200
-300
-400
VIN (V)
Page 6
20
6
4
2
-500
10
VIN = VOUT
VIN (V) (50 mV/ DIV)
GROUND CURRENT VS.
OUTPUT CURRENT
IGND (mA)
VDROP (mV)
VOUT (50 mV/ DIV)
VOUT TYPICAL
0
0
IOUT (mA)
0
100
IOUT (mA)
200
0
0
75
150
IOUT (mA)
March 1999 TOKO, Inc.
TK111xxS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
REVERSE BIAS CURRENT
(VIN = 0 V)
STANDBY CURRENT (OFF MODE)
VS. INPUT VOLTAGE
500
QUIESCENT CURRENT (ON MODE)
VS. INPUT VOLTAGE
100
IOUT = 0 mA
2
300
200
IQ (mA)
ISTBY (pA)
IREV (µA)
400
50
VOUT = 3 V
1
100
0
0
10
0
0
20
10
5
VIN (V)
VIN (V)
CONTROL CURRENT VS.
CONTROL VOLTAGE
GROUND CURRENT
DROPOUT VOLTAGE
2
VOUT
IOUT = 60 mA
200
6
4
VDROP (mV)
IGND (mA)
8
1
IOUT = 30 mA
IOUT = 100 mA
IOUT = 60 mA
100
IOUT = 30 mA
2
1
2
3
4
0
-50
5
50
0
-50
100
0
50
100
VCONT (V)
TA (°C)
TA (°C)
CONTROL CURRENT
VCONT (VOUT, ON POINT)
MAXIMUM OUTPUT CURRENT
RCONT = 0 Ω
2
10
VOUT = 2.7 V
OR ABOVE
260
VCONT = 5 V
VCONT (V)
8
ICONT (µA)
0
6
4
IOUT (mA)
0
0
10
VREV (V)
10
ICONT (µA)
0
0
20
1
VCONT = 1.8 V
250
240
230
2
220
0
-50
0
50
TA (°C)
March 1999 TOKO, Inc.
100
0
-50
0
50
TA (°C)
100
-50
0
50
100
TA (°C)
Page 7
TK111xxS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
RIPPLE REJECTION
0
10
-20
2.8 V
0
3.0 V
250
IOUT = 30 mA
-40
CL = 4.7 µF, CN = 0.1 µF
-60
-20
-80
IOUT = 60 mA
200
CL = 2.2 µF, CN = .01 µF
-10
CL = 2.2 µF
150
CL = 3.3µF
100
CL = 10 µF
-30
-50
0
50
-100
0.01
100
50
CL = 4.7 µF, CN = 1.0 µF
1
10
0
1 pF
100
10
100
1000
0.1 µF .1
TA (°C)
f (kHz)
CN
NOISE SPECTRUM
LINE VOLTAGE STEP RESPONSE
LOAD CURRENT STEP RESPONSE 1
0
CL = 3.3 µF, CN = NONE
CL = 3.3 µF, CN = 0.1 µF
CN = 0.001 µF
0
500 k
1M
0
100
200
CL = 2.2 µF
CN = 0.01 µF
1 OR 5 mA
1 TO 100 mA
CN = 0.01 µF
TIME (µs)
f (Hz)
IOUT
VOUT +1 V
SPECTRUM ANALYZER BACKGROUND NOISE
-100
100 mA
VOUT (50 mV/ DIV)
-50
VIN
VOUT +2 V
VOUT (10 mV/ DIV)
dB
OUTPUT NOISE LEVEL VS. CN
NOISE (µV)
20
RR (dB)
∆VOUT (mV)
OUTPUT VOLTAGE VARIATION
5 TO 100 mA
300
400
0
200
400
600
800
TIME (µs)
LOAD CURRENT STEP RESPONSE 2
IOUT
VOUT (10 mV/ DIV)
50 mA
CN = 0.01 µF
0 mA
CL = 4.7 µF
CL = 2.2 µF
CL = 10 µF
CL = 47 µF
0
2
4
6
8
TIME (ms)
Page 8
March 1999 TOKO, Inc.
TK111xxS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (VOUT)
the ground terminal under no load conditions (IOUT = 0 mA).
The output voltage is specified with VIN = (VOUT(TYP) + 1 V)
and IOUT = 10 mA.
GROUND CURRENT
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))
The rated output current is specified under the condition
where the output voltage drops 0.3 V below the value
specified with IOUT = 10 mA. The input voltage is set to
VOUT +1 V, and the current is pulsed to minimize
temperature effect.
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 200 mVrms, 1 kHz superimposed on the
input voltage, where VIN = VOUT + 2 V. The output decoupling
capacitor is set to 4.7 µF, the noise bypass capacitor is set
to 0.01 µF, 0.1 µF, 1.0 µF and the load current is set to
10 mA. Ripple rejection is the ratio of the ripple content of
the output vs. the input and is expressed in dB.
Example: 64 dB at CN = 0.01 µF, 70 dB at
CN = 0.1 µF, 74 dB at CN = 1.0 µF.
CONTINUOUS OUTPUT CURRENT (IOUT)
Normal operating output current. This is limited by the
package power dissipation.
PULSE OUTPUT CURRENT (IOUT (PULSE))
STANDBY CURRENT (ISTBY)
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 = 6 V.
Max pulse width 5 ms, Duty cycle 12.5%: pulse load only.
SENSOR CIRCUITS
LINE REGULATION (Line Reg)
Overcurrent Sensor
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.
The overcurrent sensor protects the device in the event
that the output is shorted to ground.
Thermal Sensor
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(TYP) +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
March 1999 TOKO, Inc.
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 extreme heat,
excessive power dissipation caused by large output voltage
drops, or excessive output current. The regulator will shut
off when the temperature exceeds the safe value. As the
junction temperature decreases, 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.
Page 9
TK111xxS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
Reverse Voltage Protection
ON/OFF RESPONSE WITH CONTROL
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.
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 show 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 B
(OFF→ON)
ILOAD = 30 mA, CL = 2.2 µF
VCONT
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.
CN = 0.33 µF
CN = 0.1 µF
CN = 0.47 µF
CN = 0.68µF
CN = 1.0 µF
VOUT
REDUCTION OF OUTPUT NOISE
0
2
CONTROL FUNCTION
4
6
8
TIME (ms)
The TK111xxS has an active high control pin. The control
pin requires over 1.8 V for operation and under 0.6 V for
standby. For the range of 0.6 V < VCONT < 1.8 V, operation
is undefined. If the control function is not used, connect the
control pin to VIN.
OUTPUT VOLTAGE RESPONSE A
(OFF→ON)
VCONT
ILOAD = 30 mA, CN = 3300 pF
VIN
CL = 0.68 µF
CL = 0.47µF
CL = 1.5 µF
SW
VOUT
CL = 1.0 µF
CN
-5
5
15
25
35
45
TIME (µs)
CONTROL FUNCTION
Page 10
March 1999 TOKO, Inc.
TK111xxS
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-23-5 is increased to 500 mW. For operation at
ambient temperatures over 25 °C, the power dissipation of
the SOT-23-5 device should be derated at 4.0 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 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:
The range of usable currents can also be found from the
graph below.
(mW)
3
PD
6
DPD
4
5
25
50
75
TA ( C)
Procedure:
1)
2)
3)
4)
Find PD
PD1 is taken to be PD x (~ 0.8 - 0.9)
Plot PD1 against 25 °C
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.
1.0
MOUNTED AS
SHOWN
For Toko ICs, the internal limit for junction temperature is
150 °C. If the ambient temperature (TA) is 25 °C, then:
PD (mW)
0.8
Tj = 0jA x PD + TA
150
0.6
FREE AIR
0.4
0.2
150 °C = 0jA x PD + 25 °C
0jA = 125 °C/ PD
0
0
50
100
150
TA (°C)
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.
March 1999 TOKO, Inc.
SOT-23-5 POWER DISSIPATION CURVE
Page 11
TK111xxS
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors in order to maintain regulator loop stability. The recommended
minimum value of the input capacitor is 0.1 µF. The output capacitor should be selected within the Equivalent Series
Resistance (ESR) range as shown in the graphs below for stable operation. When a ceramic capacitor is connected in
parallel with the output capacitor, a maximum of 1000 pF is recommended. This is because the ceramic capacitor's
electrical characteristics (capacitance and ESR) vary widely over temperature. If a large ceramic capacitor is used, a
resistor should be connected in series with it to bring it into the stable operating area shown in the graphs below. Minimum
resistance should be added to maintain load and line transient response.
Note: It is very important to check the selected manufacturers electrical characteristics (capacitance and ESR) over
temperature.
111xxS
TK111xxS
CL
CL
ESR
ESR
Note: It is not necessary to connect a ceramic capacitor in parallel
with an aluminum or tantalum output capacitor.
CL = 3.3 µF
CL = 2.2 µF
CL = 10 µF
100
100
10
10
10
10
STABLE
OPERATION
AREA
1
0.1
STABLE
OPERATION
AREA
1
50
IOUT (mA)
Page 12
100
130
1
50
IOUT (mA)
100
130
STABLE
OPERATION
AREA
1
0.1
0 .01
0 .01
1
STABLE
OPERATION
AREA
1
0.1
0.1
0 .01
ESR (Ω)
100
ESR (Ω)
100
ESR (Ω)
ESR (Ω)
CL = 1 µF
0 .01
1
50
IOUT (mA)
100
130
1
50
100
130
IOUT (mA)
March 1999 TOKO, Inc.
TK111xxS
APPLICATION INFORMATION (CONT.)
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
Capacitance
Aluminum
Capacitor
Tantalum
Capacitor
Ceramic
Capacitor
1.0 µF
2.4 Ω
2.3 Ω
0.140 Ω
2.2 µF
2.0 Ω
1.9 Ω
0.059 Ω
3.3 µF
4.6 Ω
1.0 Ω
0.049 Ω
10 µF
1.4 Ω
0.5 Ω
0.025 Ω
Note: ESR is measured at 10 kHz.
BOARD LAYOUT
Copper pattern should be as large as possible. Power dissipation is 500 mW for the SOT-23-5. 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 recommended capacitance is
1.0 µF.
GND
VIN
+
VOUT
+
CONTROL
NOISE BYPASS
SOT-23-5 BOARD LAYOUT
March 1999 TOKO, Inc.
Page 13
TK111xxS
NOTES
Page 14
March 1999 TOKO, Inc.
TK111xxS
NOTES
March 1999 TOKO, Inc.
Page 15
TK111xxS
PACKAGE OUTLINE
Marking Information
SOT-23-5
0.7
TK111xxS
Product Code
W
TK11120S
TK11121S
TK11122S
TK11123S
TK11124S
TK11125S
TK11127S
TK11128S
TK11129S
TK11130S
TK11131S
TK11132S
TK11133S
TK11134S
TK11135S
TK11136S
TK11137S
TK11138S
TK11139S
TK11140S
TK11141S
TK11142S
TK11143S
TK11144S
TK11145S
TK11146S
TK11147S
TK11148S
TK11149S
TK11150S
Voltage Code
20
21
22
23
24
25
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Marking
1.0
4
(0.6)
1.6
e1 2.4
(0.6)
5
1
2
3
0.4
e
0.95
e
e
0.95
0.95
e'
+0.15
-0.05
1.90
Recommended Mount Pad
e 0.95
0.1
M
max
+0.15
(0.8)
± 0.3
2.8
0 - 15
0.1
0.15 - 0.05
1.1
0 - 0.1
1.4 max
2.9
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
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
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
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
March 1999 TOKO, Inc.
IC-xxx-TK111S
0798O0.0K
Printed in the USA