TOKO TK71150NT

TK711xx
LOW DROPOUT REGULATOR
NOT RECOMMENDED
FOR NEW DESIGNS
APPLICATIONS
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FEATURES
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Low Dropout Voltage
Low Quiescent Current
Very Stable Output
Short Circuit Protected
Thermal Overload Protected
Standard TO-92 Package
Battery Powered Systems
Portable Consumer Equipment
Cordless Telephones
Personal Communications Equipment
Radio Control Systems
Toys
Low Voltage Systems
DESCRIPTION
TK711xx
15
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.
0
1
2
3
PIN 1. OUTPUT
2. GROUND
3. INPUT
ORDERING INFORMATION
BLOCK DIAGRAM
TK711
Tape/Reel Code
VoltageCode
VOLTAGE CODE
TAPE/REEL CODE
20 = 2.0 V
25 = 2.5 V
30 = 3.0 V
33 = 3.3 V
NT: Tape Left
35 = 3.5 V
40 = 4.0 V
45 = 4.5 V
50 = 5.0 V
VIN
VOUT
THERMAL
PROTECTION
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
MIN
TYP
MAX
UNITS
VIN = 3.0 V, IOUT = 0 mA
130
300
µA
VIN = 1.9 V, IOUT = 0 mA
1.4
3.0
mA
2.0
2.1
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 3.0 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 3.0 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 3.0 to 13.0 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.15
mV/° C
1.9
100
160
mA
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
MIN
TYP
MAX
UNITS
VIN = 3.5 V, IOUT = 0 mA
130
300
µA
VIN = 2.0 V, IOUT = 0 mA
1.4
3.0
mA
2.5
2.6
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 3.5 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 3.5 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 3.5 to 13.5 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.15
mV/° C
2.4
100
160
mA
TK71130 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 4.0 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 4.0 V, IOUT = 0 mA
130
300
µA
VIN = 2.5 V, IOUT = 0 mA
1.4
3.0
mA
3.0
3.1
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 4.0 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 4.0 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 4.0 to 14.0 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
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.
2.9
100
160
mA
Page 3
TK711xx
TK71133 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 3.9 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 3.9 V, IOUT = 0 mA
130
300
µA
VIN = 2.8 V, IOUT = 0 mA
1.4
3.0
mA
3.3
3.4
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 3.9 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 3.9 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 3.9 to 13.9 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.18
mV/° C
3.2
100
160
mA
TK71135 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 4.1 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 4.1 V, IOUT = 0 mA
130
300
µA
VIN = 3.0 V, IOUT = 0 mA
1.4
3.0
mA
3.50
3.61
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 4.1 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 4.1 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 4.1 to 14.0 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
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
3.39
100
160
mA
July 2000 TOKO, Inc.
TK711xx
TK71140 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 4.6 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 4.6 V, IOUT = 0 mA
130
300
µA
VIN = 3.5 V, IOUT = 0 mA
1.4
3.0
mA
4.00
4.12
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 4.6 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 4.6 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 4.6 to 14.0 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.2
mV/° C
3.88
100
160
mA
TK71145 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 5.1 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 5.1 V, IOUT = 0 mA
130
300
µA
VIN = 4.0 V, IOUT = 0 mA
1.4
3.0
mA
4.50
4.64
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 5.1 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 5.1 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 5.1 to 14.0 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
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.
4.36
100
160
mA
Page 5
TK711xx
TK71150 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 5.6 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 5.6 V, IOUT = 0 mA
130
300
µA
VIN = 4.0 V, IOUT = 0 mA
1.4
3.0
mA
5.00
5.15
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 5.6 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 5.6 V, IOUT = 30 mA
1.5
3.5
mA
Line Reg
Line Regulation
VIN = 5.6 to 14.0 V
10
30
mV
Line Reg
Load Regulation
IOUT = 1 to 60 mA
20
40
mV
RR
Ripple Rejection
CL = 3.3 µF, f = 400 Hz, IOUT = 10 mA
63
dB
∆VOUT /∆T
Temperature Coefficient
0.25
mV/° C
4.85
100
160
mA
Gen Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Page 6
July 2000 TOKO, Inc.
TK711xx
TEST CIRCUIT
IN
VIN
VOUT
GND
+
+
0.1 F
VIN
3.3 F
IOUT
VOUT
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 ° C, unless otherwise specified.
DROPOUT VOLTAGE VS.
AMBIENT TEMPERATURE
GROUND CURRENT VS.
AMBIENT TEMPERATURE
5
30
4
10
-10
500
IOUT = 60 mA
400
VDROP (mV)
50
IGND (mA)
VOUT (mV)
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
3
IOUT = 30 mA
2
-50
0
10
0
-50
20
IOUT = 60 mA
200
100
1
-30
300
0
50
0
-50
100
100
TA (°C)
NOISE SPECTRUM
RIPPLE REJECTION VS.
FREQUENCY
LINE TRANSIENT RESPONSE
VOUT(TYP) + 2 V
-50
CL = 10 µF
INSTRUMENT NOISE FLOOR
-150
500
FREQUENCY (kHz)
July 2000 TOKO, Inc.
1000
-100
100
1k
10 k
FREQUENCY (Hz)
VOUT(TYP) + 1 V
VOUT
CL = 3.3 µF
VOUT (20 mV / DIV)
RR (dB)
CL = 1 µF
VIN
IOUT = 30 mA
NOISE (dB)
50
TA (°C)
0
0
0
VIN (V)
-50
-100
IOUT = 30 mA
100 k
TIME (50 µs / DIV)
Page 7
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
GROUND CURRENT VS.
OUTPUT CURRENT
LOAD TRANSIENT RESPONSE
10
IOUT
IOUT = 30 mA
VOUT (50 mV / DIV)
8
IGND (mA)
0 mA
VOUT
VOUT (400 mV / DIV)
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
CL = 3.3 µF
6
4
VOUT(TYP) + 1 V
30 mA
IOUT = 0 mA
60 mA
2
CL = 1.0 µF
VIN = VOUT
0
0
50
100
TIME (50 µs / DIV)
IOUT (mA)
VIN (100 mV / DIV)
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
TK71120
2.05
2
150
100
0
10
0
50
IOUT (mA)
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
5
400
4
300
200
100
100
2.05
3
2
2.00
1
0
50
IOUT (mA)
Page 8
5
100
50
-50
0
50
500
0
IOUT (mA)
1
VOUT (V)
1.95
0
VDROP (mV)
IQ (mA)
2.00
VOUT (V)
VOUT (V)
IOUT = 0 mA
100
0
0
100
IOUT (mA)
200
1.95
-50
0
50
100
TA (°C)
July 2000 TOKO, Inc.
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71125
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
2
2.55
150
IOUT (mA)
1
0
50
0
100
5
100
50
-50
10
0
50
100
IOUT (mA)
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
500
5
400
4
300
200
2.55
VOUT (V)
2.45
0
VDROP (mV)
IQ (mA)
2.50
VOUT (V)
VOUT (V)
IOUT = 0 mA
3
2
2.50
1
100
2.45
-50
0
0
0
50
0
100
100
200
0
50
100
IOUT (mA)
IOUT (mA)
TA (°C)
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
TK71130
3.05
2
150
3.00
2.95
0
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
0
50
IOUT (mA)
July 2000 TOKO, Inc.
100
0
5
VIN (V)
10
100
50
-50
0
50
100
TA (°C)
Page 9
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71130 (CONT.)
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
5
400
4
300
200
100
3.05
VOUT (V)
500
VOUT (V)
VDROP (mV)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
3
2
1
0
2.95
-50
0
0
3.00
50
100
0
100
200
0
50
IOUT (mA)
IOUT (mA)
TA (°C)
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
100
TK71133
3.35
2
150
50
IOUT (mA)
1
0
5
10
50
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
5
400
4
300
200
100
3.35
3
2
3.30
1
100
0
0
50
IOUT (mA)
Page 10
0
IOUT (mA)
500
0
100
50
-50
0
100
VOUT (V)
3.25
0
VDROP (mV)
IQ (mA)
3.30
VOUT (V)
VOUT (V)
IOUT = 0 mA
100
0
100
IOUT (mA)
200
3.25
-50
0
50
100
TA (°C)
July 2000 TOKO, Inc.
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71135
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
QUIESCENT CURRENT VS.
INPUT VOLTAGE
3.55
2
150
1
100
0
5
100
50
-50
0
50
10
0
50
IOUT (mA)
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
500
5
400
4
300
200
100
100
3.55
VOUT (V)
VDROP (mV)
3.45
0
IOUT (mA)
IQ (mA)
3.50
VOUT (V)
VOUT (V)
IOUT = 0 mA
3
2
3.50
1
0
0
50
0
100
0
100
3.45
-50
200
0
50
IOUT (mA)
IOUT (mA)
TA (°C)
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
100
TK71140
4.05
2
150
4.00
3.95
0
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
0
50
IOUT (mA)
July 2000 TOKO, Inc.
100
0
5
VIN (V)
10
100
50
-50
0
50
100
TA (°C)
Page 11
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71140 (CONT.)
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
5
400
4
300
200
100
4.05
VOUT (V)
500
VOUT (V)
VDROP (mV)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
3
2
1
0
3.95
-50
0
0
4.00
50
100
0
100
200
0
50
IOUT (mA)
IOUT (mA)
TA (°C)
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
100
TK71145
2
4.55
150
IOUT (mA)
1
0
50
0
100
5
50
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
5
400
4
300
200
100
4.55
3
2
4.50
1
100
0
0
50
IOUT (mA)
Page 12
0
IOUT (mA)
500
0
100
50
-50
10
VOUT (V)
4.45
0
VDROP (mV)
IQ (mA)
4.50
VOUT (V)
VOUT (V)
IOUT = 0 mA
100
0
100
IOUT (mA)
200
4.45
-50
0
50
100
TA (°C)
July 2000 TOKO, Inc.
TK711xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71150
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
QUIESCENT CURRENT VS.
INPUT VOLTAGE
5.05
2
150
5.00
4.95
0
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
50
-50
0
50
100
0
5
100
10
0
50
IOUT (mA)
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
100
5.05
500
5
300
200
100
VOUT (V)
4
VOUT (V)
VDROP (mV)
400
3
2
1
0
0
0
5.00
50
IOUT (mA)
July 2000 TOKO, Inc.
100
0
100
IOUT (mA)
200
4.95
-50
0
50
100
TA (°C)
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
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 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 TO92 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:
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
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 ICONT.
DROPOUT VOLTAGE (VDROP)
This is a measure of how well the regulator performs as the
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.
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.
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,
the output waveform may appear to be an oscillation as the
output turns off and on and back again in succession.
Page 14
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.
July 2000 TOKO, Inc.
TK711xx
TERMS AND DEFINITIONS (CONT.)
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)
150
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.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
1000
800
PD (mW)
MOUNTED
600
400
200
0
0
50
100
150
TA (°C)
APPLICATION INFORMATION
INPUT/OUTPUT
DECOUPLING
CONSIDERATIONS
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
capacitor is also important. For example, a 4.7 µF aluminum
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.
The ESR is another important parameter. The ESR will
increase with temperature but low ESR capacitors are
often larger and more costly. In general, tantalum capacitors
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
an aluminum electrolytic. Please note that linear regulators
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
capacitor is not used. An output capacitor more than 1.0 µF
is required to maintain stability. The standard test condition
is 3.3 µF (TA = 25 °C).
TO-92 POWER DISSIPATION CURVE
July 2000 TOKO, Inc.
Page 15
TK711xx
PACKAGE OUTLINE
Marking Information
TO-92
3.8
4.8
(1.4)
Marking
5.0
TK71120
TK71125
TK71130
TK71133
TK71135
TK71140
TK71145
TK71150
13.5
+ 0.5
Lot Number
Marking
120
125
130
133
135
140
145
150
0.25
0.45
M
+0.15
-0.05
0.45
+0.15
-0.05
e 1.27
e 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
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
July 2000 TOKO, Inc.
IC-160-TK711xx
0798O0.0K
Printed in the USA