TOKO TK71550AS

TK715xxAS
LOW DROPOUT VOLTAGE REGULATOR
FEATURES
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APPLICATIONS
High Voltage Precision at ± 2.0% or ± 60 mV
Very Low Quiescent Current
Very Low Dropout Voltage
Reverse Voltage Protection
Miniature Package (SOT23-3)
Short Circuit Protection
High Ripple Rejection
Can use Multilayer Ceramic Capacitors
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Battery Powered Systems
Cellular Telephones
Pagers
Personal Communications Equipment
Portable Instrumentation
Portable Consumer Equipment
Radio Control Systems
Toys
Low Voltage Systems
DESCRIPTION
The TK715xx is a low dropout linear regulator housed in a
small SOT23-3 package, rated at 400 mW. An internal
PNP transistor is used to achieve a low dropout voltage of
105 mV (typ.) at 50 mA load current. This device offers
high precision output voltage of ± 2.0 % or ± 60 mV. The
TK715xx has a very low quiescent current of 25 µA (typ.)
at no load. The low quiescent current and dropout voltage
make this part ideal for battery powered applications. The
internal reverse bias protection eliminates the requirement
for a reverse voltage protection diode, saving cost and
board space. The high 60 dB ripple rejection and low noise
provide enhanced performance for critical applications.
TK715xxAS
VOUT
VIN
30T
20P
GND
ORDERING INFORMATION
TK715
ASCL
Tape/ Reel Code
Temp. Code
Package Code
Voltage Code
VOLTAGE CODE
TEMPERATURE CODE
TAPE/REEL CODE
15 = 1.5 V
16 = 1.6 V
17 = 1.7 V
18 = 1.8 V
19 = 1.9 V
20 = 2.0 V
21 = 2.1 V
22 = 2.2 V
23 = 2.3 V
24 = 2.4 V
25 = 2.5 V
26 = 2.6 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
C -30 to +80 °C
L: Tape Left
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
43 = 4.3 V
44 = 4.4 V
45 = 4.5 V
46 = 4.6 V
47 = 4.7 V
48 = 4.8 V
49 = 4.9 V
50 = 5.0 V
60 = 6.0 V
70 = 7.0 V
80 = 8.0 V
90 = 9.0 V
BLOCK DIAGRAM
VIN
PACKAGE CODE
S : SOT-23-3
March 2001 TOKO, Inc.
VOUT
THERMAL
PROTECTION
+
+
BANDGAP
REFERENCE
GND
Page 1
TK715xxAS
ABSOLUTE MAXIMUM RATINGS (VOUT£ 5.0 V)
Supply Voltage ............................................. -0.4 to 19 V
Power Dissipation (Note 1) ................................ 400 mW
Reverse Bias ............................................................. 8 V
Short Circuit Current ........................................... 170 mA
Storage Temperature (Ambient) .............. -55 to +150 °C
Operating Temperature (Ambient) ............ -30 to +80 °C
Max. Operating Temperature (Junction) ............. 125 °C
Operating Voltage Range ........................... 1.8 to 18.0 V
Junction Temperature ......................................... 150 °C
Lead Soldering Temperature (10 s) ..................... 235 °C
TK715xx ELECTRICAL CHARACTERISTICS (VOUT £ 5.0 V)
Test conditions: VIN = VOUT(TYP) + 1V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Quiescent Current
IOUT = 0 mA
25
45
µA
IGND
Ground Pin Current
IOUT = 15 mA
300
500
µA
VOUT
Output Voltage
IOUT = 5 mA
See Table 1
Line Reg
Line Regulation
VIN = VOUT(TYP) + 1 V to VOUT(TYP) + 6 V
3
12
mV
Load Reg
Load Regulation
IOUT = 5 to 100 mA, (Note 2)
18
36
mV
IOUT = 50 mA
0.105
0.18
V
IOUT = 100 mA, 2.4 V £ VOUT £ 5.0 V
0.16
0.28
V
IOUT = 100 mA, 2.1 V £ VOUT £ 2.4 V
0.16
0.30
V
VDROP
Dropout Voltage (Note 5)
IOUT(MAX)
Continuous Output Current
RR
Ripple Rejection
∆VOUT / ∆T Temperature Coefficient
1.8 V £ Vin £ 2.1 V (Note 3)
115
155
70
90
V
mA
(Note 4)
60
dB
IOUT = 5 mA
30
ppm/°C
Note 1: Power dissipation is 400 mW when mounted as recommended. Derate at 3.2 mW/°C for operation above 25 °C.
Note 2: Refer to “Definition of Terms.”
Note 3: Please refer to the Applications Section for more information.
Note 4: Ripple rejection is measured at VR = 200 mVrms, VIN = VOUT(TYP) + 2 V, IOUT = 10 mA, CL = 2.2 µF, f = 100 Hz.
Note 5: The minimum operating voltage for VIN can be 1.8 V. Also, the minimum voltage required for VIN is VIN = VDROP + VOUT. As a result, operating at
VOUT £ 2.0 V at the minimum input operating voltage is not preferred.
Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
Page 2
March 2001 TOKO, Inc.
TK715xxAS
ABSOLUTE MAXIMUM RATINGS (VOUT ³ 5.1 V)
Supply Voltage ............................................. -0.4 to 19 V
Power Dissipation (Note 1) ................................ 400 mW
Reverse Bias ............................................................. 8 V
Short Circuit Current ........................................... 170 mA
Storage Temperature (Ambient) .............. -55 to +150 °C
Operating Temperature (Ambient) ............ -30 to +80 °C
Max. Operating Temperature (Junction) ............. 125 °C
Operating Voltage Range .............................. 1.8 to 18 V
Junction Temperature ......................................... 150 °C
Lead Soldering Temperature (10 s) ..................... 235 °C
TK715xx ELECTRICAL CHARACTERISTICS (VOUT ³ 5.1 V)
Test conditions: VIN = VOUT(TYP) + 1V, TA = 25 °C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Quiescent Current
IOUT = 0 mA
32
60
µA
IGND
Ground Pin Current
IOUT = 15 mA
300
500
µA
VOUT
Output Voltage
IOUT = 5 mA
See Table 1
Line Reg
Line Regulation
VIN = VOUT(TYP) + 1 V to
VOUT(TYP) + 6 V or Max 18 V
3
12
mV
Load Reg
Load Regulation
IOUT = 5 to 100 mA, (Note 2)
35
80
mV
0.18
V
Dropout Voltage
IOUT = 50 mA
0.105
VDROP
IOUT = 100 mA
0.160
0.28
V
IOUT(MAX)
Continuous Output Current
RR
Ripple Rejection
∆VOUT / ∆T
Temperature Coefficient
115
V
155
mA
(Note 3)
60
dB
IOUT = 5 mA
30
ppm/°C
Note 1: Power dissipation is 400 mW when mounted as recommended. Derate at 3.2 mW/°C for operation above 25 °C.
Note 2: Refer to “Definition of Terms.”
Note 3: Ripple rejection is measured at VR = 200 mVrms, VIN = VOUT(TYP) + 2 V, IOUT = 10 mA, CL = 2.2 µF, f = 100 Hz.
Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
March 2001 TOKO, Inc.
Page 3
TK715xxAS
TK715xxAS ELECTRICAL CHARACTERISTICS TABLE 1
Output
Voltage
1.5 V
1.6 V
1.7 V
1.8 V
1.9 V
2.0 V
2.1 V
2.2 V
2.3 V
2.4 V
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
Page 4
Voltage
Code
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
VOUT(MIN)
VOUT(MAX)
1.440
1.540
1.640
1.740
1.840
1.940
2.040
2.140
2.240
2.340
2.440
2.540
2.640
2.740
2.840
2.940
3.040
3.140
3.240
3.340
1.560
1.660
1.760
1.860
1.960
2.060
2.160
2.260
2.360
2.460
2.560
2.660
2.760
2.860
2.960
3.060
3.160
3.260
3.360
3.460
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Test
Voltage
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 V
3.6 V
3.7 V
3.8 V
3.9 V
4.0 V
4.1 V
4.2 V
4.3 V
4.4 V
Output
Voltage
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
6.0 V
7.0 V
8.0 V
9.0 V
Voltage
Code
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
60
70
80
90
VOUT(MIN)
VOUT(MAX)
3.440
3.530
3.630
3.730
3.830
3.930
4.030
4.130
4.230
4.330
4.430
4.530
4.630
4.730
4.830
4.930
5.880
6.860
7.840
8.820
3.560
3.670
3.770
3.870
3.970
4.070
4.170
4.270
4.370
4.470
4.570
4.670
4.770
4.870
4.970
5.070
6.120
7.140
8.160
9.180
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Test
Voltage
4.5 V
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
7.0 V
8.0 V
9.0 V
10.0 V
March 2001 TOKO, Inc.
TK715xxAS
TEST CIRCUIT
IIN
VOUT
VIN
VIN
CL
1.0 µF
TANTALUM
CIN
0.1 µF
VOUT
IOUT
GND
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
LOAD REGULATION
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
SHORT CIRCUIT CURRENT
VOUT TYPICAL
5
VOUT (25 mV/ DIV)
VOUT (10 mV/ DIV)
VOUT TYPICAL
VOUT (V)
4
3
2
IOUT = 0 mA
IOUT = 50 mA
IOUT = 100 mA
50 mV/DIV
1
VIN = VOUT
50
IOUT (mA)
100
0
100
IOUT (mA)
0
200
VIN (V)
INPUT CURRENT VS.
INPUT VOLTAGE
REVERSE BIAS CURRENT RANGE
LINE REGULATION
(VIN = 0 V)
100
VOUT (50 mV/ DIV)
VOUT TYPICAL
80
IREV (µA)
I OUT = 0 mA
2
Because the output voltage is
different, the reverse current
will change this area.
VOUT = 2.0 V
I Q (mA)
0
0
60
1
40
VOUT = 3 V
20
VOUT = 8.0 V
0
0
10
VIN (V)
March 2001 TOKO, Inc.
20
0
5
VREV (V)
10
0
0
5
VIN (V)
10
Page 5
TK715xxAS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
500
250
-100
400
200
IOUT = 100 mA
IGND (µA)
VDROP(mV)
0
VDROP (mV)
GROUND PIN CURRENT vs.
OUTPUT CURRENT
DROPOUT VOLTAGE VS.
TEMPERATURE
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
150
100
IOUT = 50 mA
0
50
IOUT (mA)
0
-50
100
GROUND PIN CURRENT vs.
OUTPUT CURRENT
5
200
100
50
-200
300
0
50
0
100
TA (°C)
0
5
10
IOUT (mA)
OUTPUT VOLTAGE VS.
TEMPERATURE
MAX OUTPUT CURRENT
15
20
180
3
2
IOUT (mA)
10
∆VOUT (mV)
IGND (mA)
4
3.0 V
0
3.0 V
160
140
-10
120
1
-20
100
0
0
20
40
60
IOUT (mA)
80
100
-30
-50
0
50
100
0
-50
0
TA (°C)
50
100
TA (°C)
Ripple Rejection
RIPPLE REJECTION
0
-10
-20
VIN
----TANTALUM
1.0 µF : 4.7 µF
-30
dB
-40
VOUT
715xxA
CL
1.0 µF
2.2 µF
4.7 µF
0.1 µF
IOUT = 10 mA
-50
(TANTALUM OR CERAMIC)
-60
-70
-80
GND
CERAMIC
2.2 µF : 4.7 µF
RIPPLE REJECTION CIRCUIT
-90
-100
0.01 0.1
Page 6
1
10
F (kHz)
100
1000
March 2001 TOKO, Inc.
TK715xxAS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
Output Noise
NOISE LEVEL (TK71530A) VS.
OUTPUT CURRENT
VIN
VOUT
715xxA
CL = 1 µF
250
NOISE (µV)
CL = 2.2 µF
CL = 4.7 µF
200
CL
1.0 µF
2.2 µF
4.7 µF
10 µF
0.1 µF
CL = 10 µF
150
(TANTALUM)
GND
100
OUTPUT NOISE CIRCUIT
50
BW = 400 Hz~80 KHz
0
1.0
5.0
IOUT (mA)
10
Load & Line Response
LOAD CURRENT
STEP RESPONSE
LINE VOLTAGE STEP RESPONSE
VIN
VOUT + 2V
CL = 1.0 µF
50 mA
IOUT
5 mA
VOUT + 1V
25 µS/DIV
CL = 1.0 µF
25 µS/DIV
VOUT
VOUT
50 mV/DIV
50 mV/DIV
IOUT = 10mA
Note: To improve the load and line transient response, increase the value of the output capacitor.
March 2001 TOKO, Inc.
Page 7
TK715xxAS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (VOUT)
RIPPLE REJECTION RATIO (RR)
The output voltage is specified with VIN = (VOUT(TYP) + 1 V)
and IOUT = 5 mA.
Ripple rejection is the ability of the regulator to attenuate
the ripple content of the input voltage at the output. It is
specified with 200 mVrms, 100 Hz superimposed on the
input voltage, where VIN = VOUT(TYP) + 2.0 V. The output
decoupling capacitor is set to 2.2 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.
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.
REVERSE VOLTAGE PROTECTION
Normal operating output current. This is limited by package power dissipation.
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.
LINE REGULATION (Line Reg)
REDUCTION OF OUTPUT NOISE
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 or VIN =
max 18 V.
Although the architecture of the Toko regulators are 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. Please note that several parameters are affected by the value of the capacitors and bench testing is
recommended when deviating from standard values.
CONTINUOUS OUTPUT CURRENT (IOUT)
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 the output current step condition 5 mA to 100 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 control
current.
Page 8
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 SOT23-3 is increased to 400 mW. For operation at
ambient temperatures over 25 °C, the power dissipation of
the SOT23-3 device should be derated at 3.2 mW/°C. To
March 2001 TOKO, Inc.
TK715xxAS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
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:
2)
PD1 is taken to be PD x (~ 0.8 - 0.9)
3)
Plot PD1 against 25 °C
4)
Connect PD1 to the point corresponding to the 150
°C with a straight line.
5)
In design, take a vertical line from the maximum
operating temperature (e.g., 75 °C) to the derating curve.
6)
Read off the value of PD against the point at which
the vertical line intersects the derating curve. This is taken
as the maximum power dissipation, DPD.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
500
Tj = 0jA x PD + TA
MOUNTED AS SHOWN
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 (mW)
400
300
FREE AIR
200
100
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.
0
0
50
100
150
TA (°C)
SOT23-3 POWER DISSIPATION CURVE
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)
Find PD
March 2001 TOKO, Inc.
Page 9
TK715xxAS
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors in order to maintain regulator loop stability. The output capacitor
should be selected within the Equivalent Series Resistance (ESR) range as shown in the graphs below for stable
operation. The output capacitor CL can be reduced as the output voltage is increased. However, the output noise will
increase as CL is reduced, so the largest value of CL possilbe is recommended (CL = 4.7 mF or more).
Note: It is very important to check the selected manufacturers electrical characteristics (capacitance and ESR) over
temperature.
MULTI LAYER CERAMIC CAP
5.0
0.68 µF ≤ CL ≤ 4.7 µF or More
C = 0.1 µF
IN
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.5
0
CL = 0.68 µF MLCC
CL = 4.7 µF MLCC or More
Stable area is
above the line
ESR ≥ 0.01 Ω
1.0 µF
2.2 µF
3.3 µF
20
40
60
IOUT (mA)
80
100
UNSTABLE AREA UNDER
AND TO THE LEFT
Range which can be used: VOUT ³ 2.8V
VOUT ³ 2.0V
VOUT ³ 1.5V
IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 0.68 mF
IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 1.0 mF
IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 4.7 mF
TANTALUM CAP
VOUT (V)
5.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.5
0
CIN = 0.1 µF
0.1 µF ≤ CL ≤ 0.22 µF or More
CL = 0.1 µF TANTALUM
CL = 0.22 µF (TANTALUM) or More
Stable area is
above the line
ESR ≥ 1.0 Ω
0.1 µF
20
40
60
IOUT (mA)
80
100
UNSTABLE AREA UNDER
AND TO THE LEFT
Range which can be used: VOUT ³ 1.9V IOUT = 1 mA ~ Max, TANTALUM CAP. ³ 0.1 mF (CERAMIC CAP 0.22 mF
+ 2.2W
Capacitor used for evaluation: VOUT ³ 1.5V IOUT = 1 mA ~ Max, TANTALUM CAP. ³ 0.22 mF (CERAMIC CAP 0.22
mF + 2.2W
Page 10
March 2001 TOKO, Inc.
TK715xxAS
APPLICATION INFORMATION (CONT)
INPUT-OUTPUT CAPACITORS (CONT)
OUTPUT NOISE IMPROVEMENT
An RC filter can be added to the output stage of the regulator to reduce output noise when the input voltage is high and
the output current only makes small changes. Select a regulator with a slightly higher output voltage because the final
output voltage will be reduced by the RC filter. If the output current does make a large change, the output voltage will
change. The following table shows output noise, and output voltage for various values of ROUT and COUT using a 3.5 V
device.
VIN = 4.0 V, CIN = 10 mF (aluminum electrolytic), COUT = (see table), ROUT = (see table)
VOUT
VIN
ROUT
TK715xxA
COUT
CL = 2.2 µF
MEASUREMENT CONDITION
LOAD ADJ.
IOUT = 20, 30, 40 mA
OUTPUT SIDE CAPACITOR (COUT)
UNITS
IOUT
ROUT
VOUT
10 µF
47 µF
100 µF
µF
IOUT = 20 - 40 mA
0
3.500 V
210 µV
150 µV
130 µV
RMS
20 mA
10 W
3.296 V
76 µV
50 µV
40 µV
RMS
30 mA
6.8 W
3.287 V
88 µV
55 µV
48 µV
RMS
40 mA
5.1 W
3.266 V
100 µV
60 µV
48 µV
RMS
COUT
NOISE
RIPPLE REJECTION RATIO
An RC filter can be added to the input stage of the regulator to increase the ripple rejection when the input voltage is high.
Even if the resulting difference between VIN at the regulator (after the RC filter) and VOUT is small the TK71533AS will
output a stable voltage. The voltage dropped across the RC filter depends on the value of the input ripple noise. Select
the value of RIN such that the lowest value of VIN plus the ripple noise after the RC filter (peak to peak) is the output voltage
plus 0.2 V.
RIN
VOUT
VIN
TK715xxA
CIN
March 2001 TOKO, Inc.
CL
LOAD ADJ.
IOUT = 20, 30, 40 mA
Page 11
TK715xxAS
APPLICATION INFORMATION (CONT)
R(*) MAG -17.98 dB
B(*) B
-41.05 dB
10 dB/
10 dB/
-50.00 dB
-50.00 dB
R(*) MAG -57.78 dB
B(*) B
-41.05 dB
10 dB/
10 dB/
-50.00 dB
-50.00 dB
TK71533
FILTER
RIN = 27 Ω CIN = 47 µF
FILTER + TK71533
RIN = 27 Ω CIN = 47 µF CL = 10 µF
START: 100 Hz
STOP: 1 MHz
OUT (B): -20.00 dBm ST: AUTO x1
1 MΩ
IRG: 26 dBm
RBW: 30 kHZ
VBW: 38 kHz
START: 100 Hz
STOP: 1 MHz
OUT (B): -20.00 dBm ST: AUTO x1
1 MΩ
IRG: 26 dBm
RBW: 30 kHZ
VBW: 38 kHz
TEMPERATURE DEPENDENCY
VOLTAGE DEPENDENCY
100
90
B CURVE
CAPACITANCE (%)
CAPACITANCE (%)
100
80
70
F CURVE
60
50
40
0
2
4
6
8
BIAS V (V)
10
90
B CURVE
80
70
F CURVE
60
50
-50
-25
0
25
TA (°C)
50
75
100
In general, a ceramic capacitor has a voltage and temperature dependence. Parts should be selected with consideration
of the voltage and temperature used. The “B” characteristic curves are recommended.
Page 12
March 2001 TOKO, Inc.
TK715xxAS
APPLICATION INFORMATION (CONT.)
BOARD LAYOUT
The copper pattern should be as large as possible. Power dissipation is 400 mW for the SOT23-3, derated at 3.2 mW/°C for
operation above TA = 25°C (qja = 312°C/W)
The internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. This saves both
cost and board space.
SOT23-3 BOARD LAYOUT
VIN
GND
+
VOUT
+
500
P
D(mW)
400
300
200
RECOMMENDED AS SHOWN
FREE AIR
100
March 2001 TOKO, Inc.
Page 13
TK715xxAS
APPLICATION INFORMATION (CONT.)
REVERSE VOLTAGE PROTECTION
SWITCHING OPERATION
The internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. This saves
both cost and board space.
Even though the input voltages or the output voltages are
different, the outputs of the TK715xxA regulators can be
connected together, and the output voltages switched. If
two or more TK715xxA regulators are turned ON simultaneously, the highest output voltage will be present.
VIN
VIN
VOUT
715xxAS
TK71530A
VIN
Another reverse voltage protection technique is illustrated
below. The extra diode and extra capacitor are not necessary with the TK715xxA. The high output voltage accuracy
is maintained because the diode forward voltage variations over temperature and load current have been eliminated.
VIN
VOUT
TK715xxAS
VOUT
3.0 OR 2.8 V
TK71528A
GND
CURRENT BOOST OPERATION
The output current can be increased by connecting an
external PNP transistor as shown below. The output
current capability depends upon the Hfe of the external
transistor. Note: The TK715xxA internal short circuit protection and thermal sensor do not protect the external
transistor.
VIN
VIN
PARALLEL OPERATION
TK715xxA
150 Ω
VOUT
3.3 µF
0.22 µF
The series resistor R is put in the input line of the low output
voltage regulator in order to prevent overdissipation. The
voltage dropped across the resistor reduces the large
input-to-output voltage across the regulator, reducing the
power dissipation in the device.
VIN
TK71550A
TK71530A
5V
3V
R
TK71520A
Page 14
2V
March 2001 TOKO, Inc.
TK715xxAS
PACKAGE OUTLINE
Marking Information
SOT23-3
Product Code T Voltage Code
0.8
1.0
3
e1
2.4
Marking
e
0.95
VOLTAGE CODE
e
0.95
PRODUCT CODE
e1 1.90
0.4
e
1
e 0.95
0.95
Recommended Mounting Pad
+ 0.15
0.05
C1
0.1
2
1.6
15°max
±0.1
1.1
0.15
+ 0.15
0.05
0.1
0 ~ 0.1
1.3 max
2.9
0.4
2.8
±0.3
Dimensions are shown in millimeters
Tolerance: x.x = ± 0.2 mm (unless otherwise specified)
TK71515S
TK71516S
TK71517S
TK71518S
TK71519S
TK71520S
TK71521S
TK71522S
TK71523S
TK71524S
TK71525S
TK71526S
TK71527S
TK71528S
TK71529S
TK71530S
TK71531S
TK71532S
TK71533S
TK71534S
TK71535S
TK71536S
TK71537S
TK71538S
TK71539S
TK71540S
TK71541S
TK71542S
TK71543S
TK71544S
TK71545S
TK71546S
TK71547S
TK71548S
TK71549S
TK71550S
TK71560S
TK71570S
TK71580S
TK71590S
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
60
70
80
90
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
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.
March 2001 TOKO, Inc.
© 1999 Toko, Inc.
All Rights Reserved
Page 15
IC-xxx-TK715xx
0798O0.0K
Printed in the USA