TK71145NBX [TOKO]
暂无描述;
| 型号： | TK71145NBX |
| 厂家： | 
TOKO, INC |
| 描述： | 暂无描述 稳压器 |
| 文件： | 总16页 (文件大小：90K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TK711xx
LOW DROPOUT REGULATOR
NOT RECOMMENDED
FOR NEW DESIGNS
APPLICATIONS
ꢀ Battery Powered Systems
ꢀ Portable Consumer Equipment
ꢀ Cordless Telephones
ꢀ Personal Communications Equipment
ꢀ Radio Control Systems
ꢀ Toys
FEATURES
ꢀ Low Dropout Voltage
ꢀ Low Quiescent Current
ꢀ Very Stable Output
ꢀ Short Circuit Protected
ꢀ Thermal Overload Protected
ꢀꢀꢀꢀStandard TO-92 Package
ꢀ Low Voltage Systems
DESCRIPTION
TK711xx
The TK711xx is a low dropout, linear regulator housed in
a standard TO-92 package, rated at 500 mW. An internal
PNP transistor is used to achieve a low dropout voltage of
100 mV (typ.) at 30 mA load current. The TK711xx has a
low quiescent current of 130 µA (typ.) at no load. The low
quiescent current and dropout voltage make this part ideal
for battery powered applications.
150
1
2
3
PIN 1. OUTPUT
2. GROUND
3. INPUT
ORDERING INFORMATION
BLOCK DIAGRAM
TK711
Tape/Reel Code
VoltageCode
V
V
IN
OUT
THERMAL
PROTECTION
VOLTAGE CODE
TAPE/REEL CODE
20 = 2.0 V
25 = 2.5 V
30 = 3.0 V
33 = 3.3 V
35 = 3.5 V
NT: Tape Left
40 = 4.0 V
45 = 4.5 V
50 = 5.0 V
BANDGAP
REFERENCE
GND
July 2000 TOKO, Inc.
Page 1
TK711xx
ABSOLUTE MAXIMUM RATINGS
Input Voltage ............................................................ 15 V
Power Dissipation (Note 1) ................................ 500 mW
Operating Voltage Range............................... 1.4 to 14 V
Junction Temperature ........................................... 150 °C
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ...................-20 to +75 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
TK71120 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 3 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 3.0 V, IOUT = 0 mA
VIN = 1.9 V, IOUT = 0 mA
MIN
TYP
130
1.4
2.0
100
160
1.5
10
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 3.0 V, IOUT = 10 mA
1.9
2.1
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
200
mV
100
mA
IGND
VIN = 3.0 V, IOUT = 30 mA
VIN = 3.0 to 13.0 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.15
mV/° C
Note 1: Power dissipation is 500 mW when mounted. Derate at 4 mW/°C for operation above 25 °C.
Page 2
July 2000 TOKO, Inc.
TK711xx
TK71125 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 3.5 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 3.5 V, IOUT = 0 mA
VIN = 2.0 V, IOUT = 0 mA
MIN
TYP
130
1.4
2.5
100
160
1.5
10
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 3.5 V, IOUT = 10 mA
2.4
2.6
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
200
mV
100
mA
IGND
VIN = 3.5 V, IOUT = 30 mA
VIN = 3.5 to 13.5 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.15
mV/° C
TK71130 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 4.0 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 4.0 V, IOUT = 0 mA
VIN = 2.5 V, IOUT = 0 mA
MIN
TYP
130
1.4
3.0
100
160
1.5
10
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 4.0 V, IOUT = 10 mA
2.9
3.1
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
200
mV
100
mA
IGND
VIN = 4.0 V, IOUT = 30 mA
VIN = 4.0 to 14.0 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.18
mV/° C
July 2000 TOKO, Inc.
Page 3
TK711xx
TK71133 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 3.9 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 3.9 V, IOUT = 0 mA
VIN = 2.8 V, IOUT = 0 mA
MIN
TYP
130
1.4
3.3
100
160
1.5
10
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 3.9 V, IOUT = 10 mA
3.2
3.4
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
200
mV
100
mA
IGND
VIN = 3.9 V, IOUT = 30 mA
VIN = 3.9 to 13.9 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.18
mV/° C
TK71135 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 4.1 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 4.1 V, IOUT = 0 mA
VIN = 3.0 V, IOUT = 0 mA
MIN
TYP
130
1.4
3.50
100
160
1.5
10
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 4.1 V, IOUT = 10 mA
3.39
100
3.61
200
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
mV
mA
IGND
VIN = 4.1 V, IOUT = 30 mA
VIN = 4.1 to 14.0 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.2
mV/° C
Page 4
July 2000 TOKO, Inc.
TK711xx
TK71140 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 4.6 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 4.6 V, IOUT = 0 mA
VIN = 3.5 V, IOUT = 0 mA
MIN
TYP
130
1.4
4.00
100
160
1.5
10
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 4.6 V, IOUT = 10 mA
3.88
100
4.12
200
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
mV
mA
IGND
VIN = 4.6 V, IOUT = 30 mA
VIN = 4.6 to 14.0 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.2
mV/° C
TK71145 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 5.1 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 5.1 V, IOUT = 0 mA
VIN = 4.0 V, IOUT = 0 mA
MIN
TYP
130
1.4
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 5.1 V, IOUT = 10 mA
4.36
100
4.50
100
160
1.5
4.64
200
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
mV
mA
IGND
VIN = 5.1 V, IOUT = 30 mA
VIN = 5.1 to 14.0 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
10
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.25
mV/° C
July 2000 TOKO, Inc.
Page 5
TK711xx
TK71150 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 5.6 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
VIN = 5.6 V, IOUT = 0 mA
VIN = 4.0 V, IOUT = 0 mA
MIN
TYP
130
1.4
MAX
300
3.0
UNITS
µA
IQ
Quiescent Current
mA
VOUT
VDROP
IOUT
Regulated Output Voltage VIN = 5.6 V, IOUT = 10 mA
4.85
100
5.00
100
160
1.5
5.15
200
V
Dropout Voltage
Output Current
Ground Current
IOUT = 30 mA
mV
mA
IGND
VIN = 5.6 V, IOUT = 30 mA
VIN = 5.6 to 14.0 V
3.5
30
40
mA
Line Reg Line Regulation
Line Reg Load Regulation
10
mV
IOUT = 1 to 60 mA
20
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.25
mV/° C
Gen Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Page 6
July 2000 TOKO, Inc.
TK711xx
TEST CIRCUIT
I
N
V
IN
V
OUT
GND
+
+
0.1
F
3.3
F
V
IN
I
V
OUT
OUT
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 ° C, unless otherwise specified.
DROPOUT VOLTAGE VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
GROUND CURRENT VS.
AMBIENT TEMPERATURE
500
400
5
4
50
30
I
= 60 mA
OUT
10
300
200
3
2
I
= 60 mA
OUT
I
= 30 mA
OUT
-10
-30
-50
1
0
100
0
I
= 30 mA
OUT
-50
0
50
100
0
10
20
-50
0
50
100
T
(°C)
V
(V)
T (°C)
A
A
IN
RIPPLE REJECTION VS.
FREQUENCY
NOISE SPECTRUM
= 30 mA
LINE TRANSIENT RESPONSE
-50
0
V
+ 2 V
OUT(TYP)
I
OUT
C
= 1 µF
L
V
+ 1 V
OUT(TYP)
C
= 3.3 µF
L
-100
-150
-50
C
= 10 µF
L
INSTRUMENT NOISE FLOOR
-100
0
500
1000
100
1 k
10 k
100 k
TIME (50 µs / DIV)
FREQUENCY (kHz)
FREQUENCY (Hz)
July 2000 TOKO, Inc.
Page 7
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
GROUND CURRENT VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
LOAD TRANSIENT RESPONSE
= 30 mA
INPUT VOLTAGE
10
8
I
OUT
V
+ 1 V
OUT(TYP)
0 mA
30 mA
I
= 0 mA
6
4
OUT
C
= 3.3 µF
L
60 mA
2
0
V
= V
C
= 1.0 µF
IN
OUT
L
0
50
100
TIME (50 µs / DIV)
I
(mA)
V
(100 mV / DIV)
IN
OUT
TK71120
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
2.05
2.00
1.95
2
1
0
150
I
= 0 mA
OUT
100
50
-50
0
50
100
0
50
100
0
5
10
T
(°C)
I
(mA)
V
(V)
IN
A
OUT
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
500
400
300
200
2.05
5
4
3
2
2.00
1.95
100
0
1
0
0
50
100
0
100
(mA)
200
-50
0
50
100
I
(mA)
I
T (°C)
A
OUT
OUT
Page 8
July 2000 TOKO, Inc.
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71125
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
2
1
0
2.55
150
I
= 0 mA
OUT
2.50
100
50
2.45
0
0
5
10
-50
0
50
100
100
100
50
100
100
100
V
(V)
T (°C)
A
I
(mA)
IN
OUT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
2.55
5
4
3
2
500
400
300
200
2.50
2.45
100
1
0
0
0
50
0
100
(mA)
200
-50
0
50
I
(mA)
I
T (°C)
A
OUT
OUT
TK71130
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
3.05
2
1
0
150
I
= 0 mA
OUT
3.00
100
50
2.95
0
-50
0
50
50
0
5
10
T
A
(°C)
I
(mA)
V
(V)
OUT
IN
July 2000 TOKO, Inc.
Page 9
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71130 (CONT.)
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
3.05
500
400
300
200
5
4
3
2
3.00
2.95
100
0
1
0
-50
0
50
100
0
50
100
0
100
(mA)
200
T
(°C)
I
(mA)
I
OUT
A
OUT
TK71133
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
QUIESCENT CURRENT VS.
INPUT VOLTAGE
3.35
2
1
0
150
I
= 0 mA
OUT
3.30
100
50
3.25
0
50
100
-50
0
50
100
0
5
10
I
(mA)
T (°C)
A
V
(V)
OUT
IN
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
3.35
500
400
300
200
5
4
3
2
3.30
3.25
100
1
0
0
0
50
100
0
100
(mA)
200
-50
0
50
100
I
(mA)
I
T (°C)
A
OUT
OUT
Page 10
July 2000 TOKO, Inc.
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71135
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
3.55
2
1
0
150
I
= 0 mA
OUT
3.50
100
50
3.45
0
-50
0
50
100
50
100
0
5
10
T
(°C)
I
(mA)
V
(V)
IN
A
OUT
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
500
400
300
200
3.55
5
4
3
2
3.50
3.45
100
1
0
0
0
50
100
0
100
(mA)
200
-50
0
50
100
I
(mA)
I
T (°C)
A
OUT
OUT
TK71140
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
4.05
2
1
0
150
I
= 0 mA
OUT
4.00
100
50
3.95
0
-50
0
50
100
50
100
0
5
10
T
A
(°C)
I
(mA)
V
(V)
IN
OUT
July 2000 TOKO, Inc.
Page 11
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71140 (CONT.)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
4.05
500
400
300
200
5
4
3
2
4.00
3.95
100
0
1
0
0
50
(mA)
100
100
100
0
100
(mA)
200
-50
0
50
100
100
100
I
I
T (°C)
A
OUT
OUT
TK71145
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
2
1
0
4.55
150
I
= 0 mA
OUT
4.50
100
50
4.45
0
50
0
5
10
-50
0
50
I
(mA)
V
(V)
T (°C)
A
OUT
IN
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
4.55
5
4
3
2
500
400
300
200
4.50
4.45
100
1
0
0
0
50
0
100
(mA)
200
-50
0
50
I
(mA)
I
T (°C)
A
OUT
OUT
Page 12
July 2000 TOKO, Inc.
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71150
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
5.05
2
1
0
150
I
= 0 mA
OUT
5.00
100
50
4.95
0
-50
0
50
100
50
100
0
5
10
T
(°C)
I
(mA)
V
(V)
IN
A
OUT
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
5.05
500
400
300
200
5
4
3
2
1
0
5.00
4.95
100
0
0
50
100
0
100
(mA)
200
-50
0
50
100
I
(mA)
I
T (°C)
A
OUT
OUT
July 2000 TOKO, Inc.
Page 13
TK711xx
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
LINE REGULATION (LINE REG)
PACKAGE POWER DISSIPATION (PD)
Line regulation is the ability of the regulator to maintain a
constant output voltage as the input voltage changes.
This is the power dissipation level at which the thermal
sensor is activated. The IC contains an internal thermal
sensorwhichmonitorsthejunctiontemperature. Whenthe
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 mounting pad, the power dissipation of the TO-92 is
increased to 500 mW. For operation at ambient
temperatures over 25 °C, the power dissipation of the TO-
92 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
fortheambienttemperatureofthePCB.Thevalueobtained
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:
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.
The load regulation is specified an output current step
condition of 1 mA to 60 mA.
QUIESCENT CURRENT (IQ)
The quiescent current is the current which flows through
thegroundterminalundernoloadconditions(IOUT =0mA).
GROUND CURRENT (IGND
)
Ground current is the current which flows through the
ground pin(s). It is defined as IIN - IOUT, excluding ICONT
.
DROPOUT VOLTAGE (VDROP
)
Thisisameasureof howwelltheregulatorperformsasthe
input voltage decreases. The smaller the number, the
further the input voltage can decrease before regulation
problems occur. Nominal output voltage is first measured
when VIN = VOUT + 1 at a chosen load current. When the
output voltage has dropped 100 mV from the nominal, VIN
- VO is the dropout voltage. This voltage is affected by load
current and junction temperature.
Tj = 0jA x PD + TA
OUTPUT NOISE VOLTAGE
This is the effective AC voltage that occurs on the output
voltage under the condition where the input noise is low
and with a given load, filter capacitor, and frequency
range.
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
THERMAL PROTECTION
This is an internal feature which turns the regulator off
when the junction temperature rises above 150 °C. After
the regulator turns off, the temperature drops and the
regulator output turns back on. Under certain conditions,
theoutputwaveformmayappeartobeanoscillationasthe
output turns off and on and back again in succession.
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.
Page 14
July 2000 TOKO, Inc.
TK711xx
APPLICATION INFORMATION
TERMS AND DEFINITIONS (CONT.)
The range of usable currents can also be found from the
graph below.
INPUT/OUTPUT
CONSIDERATIONS
DECOUPLING
CAPACITOR
Voltage regulators require input and output decoupling
capacitors. The required value of these capacitors vary
with application. Capacitors made by different
manufacturers can have different characteristics,
particularly with regard to high frequencies and Equivalent
Series Resistance (ESR) over temperature. The type of
capacitorisalsoimportant.Forexample,a4.7µFaluminum
electrolytic may be required for a certain application. If a
tantalum capacitor is used, a lower value of 2.2 µF would
be adequate. It is important to consider the temperature
characteristics of the decoupling capacitors. While Toko
regulators are designed to operate as low as -40 °C, many
capacitors will not operate properly at this temperature.
The capacitance of aluminum electrolytic capacitors may
decrease to 0 at low temperatures. This may cause
oscillation on the output of the regulator since some
capacitance is required to guarantee stability. Thus, it is
important to consider the characteristics of the capacitor
over temperature when selecting decoupling capacitors.
(mW)
3
P
D
6
D
PD
4
5
25
50
75
(°C)
150
T
A
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
The ESR is another important parameter. The ESR will
increase with temperature but low ESR capacitors are
oftenlargerandmorecostly.Ingeneral,tantalumcapacitors
offer lower ESR than aluminum electrolytic, but new low
ESR aluminum electrolytic capacitors are now available
from several manufacturers. Usually a bench test is
sufficient to determine the minimum capacitance required
for a particular application. After taking thermal
characteristics and tolerance into account, the minimum
capacitance value should be approximately two times this
value. The recommended minimum capacitance for the
TK711xxN is 2.1 µF for a tantalum capacitor or 3.3 µF for
analuminumelectrolytic.Pleasenotethatlinearregulators
with a low dropout voltage have high internal loop gains
which require care in guarding against oscillation caused
by insufficient decoupling capacitance. The use of high
quality decoupling capacitors suited for your application
will guarantee proper operation of the circuit. Pay attention
to temperature characteristics of the capacitor, especially
the increase of ESR and decrease of capacitance in low
temperatures. Oscillation, reduction of ripple rejection and
increased noise may occur in some cases if the proper
capacitorisnotused. Anoutputcapacitormorethan1.0µF
isrequiredtomaintainstability.Thestandardtestcondition
is 3.3 µF (TA = 25 °C).
as the maximum power dissipation, DPD
.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT
)
1000
800
600
400
MOUNTED
200
0
0
50
100
150
T
(°C)
A
TO-92 POWER DISSIPATION CURVE
July 2000 TOKO, Inc.
Page 15
TK711xx
PACKAGE OUTLINE
Marking Information
TO-92
3.8
4.8
Marking
(1.4)
Marking
TK71120
TK71125
TK71130
TK71133
TK71135
TK71140
TK71145
TK71150
120
125
130
133
135
140
145
150
Lot Number
0.25
M
+0.15
-0.05
+0.15
-0.05
0.45
0.45
e
e
1.27
1.27
1
2
3
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
R2.4
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
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
Fax: (847) 699-7864
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
July 2000 TOKO, Inc.
© 1999 Toko, Inc.
IC-160-TK711xx
0798O0.0K
Printed in the USA
All Rights Reserved
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