TOKO TK71240M

TK712xx
LOW DROPOUT REGULATOR
FEATURES
APPLICATIONS
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Low Dropout Voltage
Low Quiescent Current
Very Stable Output
Low Noise (35 µVrms)
Miniature Package (SOT-25)
Battery Powered Systems
Portable Consumer Equipment
Cordless Telephones
Personal Communications Equipment
Radio Control Systems
Toys
Low Voltage Systems
DESCRIPTION
TK712xx is a low dropout, linear regulator. Since a PNP
power transistor is used, dropout voltage is very low,
making it possible to maintain stable output voltage even
as the battery decreases. This allows longer battery life.
The TK712xx has a noise bypass pin available for noise
reduction.
TK712xx
NOISE
BYPASS
The TK712xx is available in a miniature SOT-25 surface
mount package.
VIN
20 P
GND
GND
VOUT
ORDERING INFORMATION
TK712
M
BLOCK DIAGRAM
Tape/Reel Code
VoltageCode
VIN
VOLTAGE CODE
TAPE/REEL CODE
20 = 2.0 V
25 = 2.5 V
28 = 2.8 V
30 = 3.0 V
33 = 3.3 V
TL: Tape Left
35 = 3.5 V
40 = 4.0 V
45 = 4.5 V
50 = 5.0 V
VOUT
THERMAL
PROTECTION
NOISE
BYPASS
BANDGAP
REFERENCE
GND
GND
January 1999 TOKO, Inc.
Page 1
TK712xx
ABSOLUTE MAXIMUM RATINGS
Input Voltage ............................................................ 15 V
Power Dissipation (Note 1) ................................ 350 mW
Operating Voltage Range ............................... 1.4 to 14 V
Junction Temperature ........................................... 150 °C
Storage Temperature Range ................... -55 to +150 °C
Operating Temperature Range ................... -30 to +80 °C
Lead Soldering Temperature (10 s) ...................... 235 °C
TK71220 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
13 0
300
µA
VIN = 1.8 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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.15
mV/° C
1.9
100
160
mA
Note 1: Power dissipation is 350 mW when mounted as recommended. Derate at 2.8 mW/°C for operation above 25 °C.
Page 2
January 1999 TOKO, Inc.
TK712xx
TK71225 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
13 0
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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.15
mV/° C
2.4
100
160
mA
TK71228 ELECTRICAL CHARACTERISTICS
Test Conditions: VIN = 3.8 V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VIN = 3.8 V, IOUT = 0 mA
13 0
300
µA
VIN = 2.5 V, IOUT = 0 mA
1.4
3.0
mA
2.8
2.9
V
100
200
mV
IQ
Quiescent Current
VOUT
Regulated Output Voltage
VIN = 3.8 V, IOUT = 10 mA
VDROP
Dropout Voltage
IOUT = 30 mA
IOUT
Output Current
IGND
Ground Current
VIN = 3.8 V, IOUT = 30 mA
1. 5
3.5
mA
Line Reg
Line Regulation
VIN = 3.8 to 13.8 V
10
30
mV
Load 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
Vref
Noise Bypass terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.18
mV/° C
January 1999 TOKO, Inc.
2.7
100
160
mA
Page 3
TK712xx
TK71230 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
13 0
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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.18
mV/° C
2.9
100
160
mA
TK71233 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
13 0
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 14.0 V
10
30
mV
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.18
mV/° C
Page 4
3.2
100
160
mA
January 1999 TOKO, Inc.
TK712xx
TK71235 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
13 0
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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.2
mV/° C
3.39
100
160
mA
TK71240 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
13 0
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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.2
mV/° C
January 1999 TOKO, Inc.
3.88
100
160
mA
Page 5
TK712xx
TK71245 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
13 0
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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.25
mV/° C
4.36
100
160
mA
TK71250 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
13 0
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
Load 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
Vref
Noise Bypass Terminal
Voltage
1.27
V
∆VOUT /∆T
Temperature Coefficient
0.25
mV/° C
Page 6
4.85
100
160
mA
January 1999 TOKO, Inc.
TK712xx
TEST CIRCUIT
IIN
VIN
VOUT
+
+
VIN
CL
NOISE
BYPASS
IOUT
VOUT
GND
CN
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 ° C, unless otherwise specified.
GROUND CURRENT VS.
AMBIENT TEMPERATURE
5
30
4
10
-10
-30
500
IOUT = 60 mA
400
3
IOUT = 30 mA
2
1
-50
0
10
IOUT = 60 mA
200
0
50
0
-50
100
IOUT = 30 mA
0
50
100
VIN (V)
TA (°C)
TA (°C)
NOISE VOLTAGE VS.
BYPASS CAPACITOR
NOISE SPECTRUM
RIPPLE REJECTION VS.
FREQUENCY
-50
IOUT = 30 mA
CL = 3.3 µF
0
IOUT = 30 mA
CL = 1 µF
VOUT = 5 V
CL = 10 µF
150
CL = 10 µF
100
CN = 0.01 µF
CL = 1 µF
RR (dB)
CL = 1.0 µF
200
50
300
100
0
-50
20
NOISE (dB)
300
NOISE (µV)
DROPOUT VOLTAGE VS.
AMBIENT TEMPERATURE
VDROP (mV)
50
IGND (mA)
VOUT (mV)
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
-100
-50
CL = 10 µF
INSTRUMENT NOISE FLOOR
VOUT = 2 V
0
1 pF 10 pF 100 pF 1000 pF 0.01 µF.1 µF
CN
January 1999 TOKO, Inc.
-150
0
500
FREQUENCY (kHz)
1000
-100
100
1k
10 k
100 k
FREQUENCY (Hz)
Page 7
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
LINE TRANSIENT RESPONSE
10
8
0 mA
CL = 3.3 µF
IGND (mA)
VOUT
VOUT
VOUT(TYP) + 1 V
IOUT
IOUT = 30 mA
VOUT (400 mV / DIV)
VIN
VOUT(TYP) + 2 V
VOUT (20 mV / DIV)
GROUND CURRENT VS.
OUTPUT CURRENT
LOAD TRANSIENT RESPONSE
6
4
2
CL = 1.0 µF
0
0
TIME (50 µs / DIV)
TIME (50 µs / DIV)
50
100
IOUT (mA)
VOUT (50 mV / DIV)
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
VOUT(TYP) + 1 V
30 mA
IOUT = 0 mA
60 mA
VIN = VOUT
VIN (100 mV / DIV)
Page 8
January 1999 TOKO, Inc.
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71220
QUIESCENT CURRENT VS.
INPUT VOLTAGE
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
2
2.05
150
2.00
1
0
1.95
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
5
400
4
VOUT (V)
500
300
200
2.05
VOUT (V)
0
VDROP (mV)
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
3
2
2.00
1
100
0
0
0
50
0
100
100
1.95
-50
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
TK71225
2.55
2
150
2.50
2.45
0
50
IOUT (mA)
January 1999 TOKO, Inc.
100
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
0
0
5
VIN (V)
10
100
50
-50
0
50
100
TA (°C)
Page 9
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71225 (CONT.)
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
5
400
4
300
200
2.55
VOUT (V)
500
VOUT (V)
VDROP (mV)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
3
2
2.50
1
100
0
0
0
50
0
100
100
2.45
-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
TK71228
2
2.85
150
2.80
1
0
2.75
50
0
100
50
-50
10
0
50
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
400
4
VOUT (V)
5
300
200
100
2.85
3
2
2.80
1
100
0
50
IOUT (mA)
Page 10
100
IOUT (mA)
500
0
0
5
VOUT (V)
0
VDROP (mV)
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
100
0
100
IOUT (mA)
200
2.75
-50
0
50
100
TA (°C)
January 1999 TOKO, Inc.
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71230
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
3.05
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
2
150
3.00
2.95
1
0
50
100
0
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
5
400
4
VOUT (V)
500
300
200
3.05
3
2
3.00
1
100
0
0
5
VOUT (V)
0
VDROP (mV)
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
0
50
0
100
100
2.95
-50
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
TK71233
3.35
2
150
3.30
3.25
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
0
0
50
IOUT (mA)
January 1999 TOKO, Inc.
100
0
5
VIN (V)
10
100
50
-50
0
50
100
TA (°C)
Page 11
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71233 (CONT.)
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
5
400
4
300
200
3.35
VOUT (V)
500
VOUT (V)
VDROP (mV)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
3
2
3.30
1
100
0
0
0
50
0
100
100
3.25
-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
TK71235
3.55
2
150
3.50
3.45
1
50
100
0
0
50
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
4
300
200
100
3.55
VOUT (V)
400
VOUT (V)
5
3
2
3.50
1
100
0
50
IOUT (mA)
Page 12
10
IOUT (mA)
500
0
0
5
100
50
-50
0
0
VDROP (mV)
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
100
0
100
IOUT (mA)
200
3.45
-50
0
50
100
TA (°C)
January 1999 TOKO, Inc.
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71240
OUTPUT VOLTAGE VS.
OUTPUT CURRENT
QUIESCENT CURRENT VS.
INPUT VOLTAGE
4.05
OUTPUT CURRENT VS.
AMBIENT TEMPERATURE
2
150
4.00
3.95
50
1
0
100
0
50
-50
10
0
50
100
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
5
400
4
300
200
100
4.05
VOUT (V)
500
0
0
5
100
IOUT (mA)
VOUT (V)
VDROP (mV)
0
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
3
2
4.00
1
3.95
-50
0
50
100
0
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
TK71245
4.55
2
150
4.50
4.45
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
0
0
50
IOUT (mA)
January 1999 TOKO, Inc.
100
0
5
VIN (V)
10
100
50
-50
0
50
100
TA (°C)
Page 13
TK712xx
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 ° C, unless otherwise specified.
TK71245 (CONT.)
5
400
4
300
200
100
4.55
VOUT (V)
500
0
0
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
SHORT CIRCUIT PROTECTION
VOUT (V)
VDROP (mV)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
3
2
4.50
1
4.45
-50
0
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
TK71250
5.05
2
150
5.00
4.95
IOUT (mA)
IQ (mA)
VOUT (V)
IOUT = 0 mA
1
0
0
50
100
0
5
100
50
-50
10
0
50
IOUT (mA)
VIN (V)
TA (°C)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE VS.
AMBIENT TEMPERATURE
500
100
5.05
5
400
300
200
100
0
0
3
2
5.00
1
50
IOUT (mA)
Page 14
VOUT (V)
VOUT (V)
VDROP (mV)
4
100
0
0
100
IOUT (mA)
200
4.95
-50
0
50
100
TA (°C)
January 1999 TOKO, Inc.
TK712xx
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 SOT-25 is
increased to 350 mW. For operation at ambient
temperatures over 25 °C, the power dissipation of the
SOT-25 device should be derated at 2.8 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.
January 1999 TOKO, Inc.
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.
Page 15
TK712xx
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (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
MOUNTED
PD (mW)
600
400
FREE AIR
200
0
0
50
100
150
TA (°C)
SOT-25 POWER DISSIPATION CURVE
Page 16
January 1999 TOKO, Inc.
TK712xx
APPLICATION INFORMATION
INPUT/OUTPUT
DECOUPLING
CONSIDERATIONS
CAPACITOR
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
TK712xx is 2.2 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).
January 1999 TOKO, Inc.
Optimum performance can only be achieved when the IC
is mounted on a PC board according to the diagram below.
This is because of the extremely small package and limited
power dissipation. Shape the metal portion of the PCB as
shown in the following drawing.
VIN
VOUT
+
+
GND
GND
+
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.
OPTIMUM PERFORMANCE
CN
SOT-25 BOARD LAYOUT
Use a large bypass capacitor and connect it in a place near
GND of the IC. 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).
Page 17
TK712xx
PACKAGE OUTLINE
Marking Information
SOT-25 (SOT-23-5)
0.7
TK71220
TK71225
TK71228
TK71230
TK71233
TK71235
TK71240
TK71245
TK71250
Marking
(0.6)
1.6
+0.2
- 0.3
e1 2.4
(0.6)
1.0
4
5
1
2
e
3
e
0.95
0.95
+0.15
- 0.05
Marking
J20
J25
J28
J30
J33
J35
J40
J45
J50
1.90
e'
0.4
e
Recommended Mount Pad
0.95
e 0.95
0.1
M
(0.8)
max
+0.15
- 0.05
2.8
0.3
15
0.1
0.16
0 - 0.1
1.1
+0.1
1.3 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 18
© 1999 Toko, Inc.
All Rights Reserved
January 1999 TOKO, Inc.
IC-161-TK712xx
0798O0.0K
Printed in the USA