TK71524AS [TOKO]
LOW DROPOUT VOLTAGE REGULATOR; 低压差稳压器
| 型号： | TK71524AS |
| 厂家： | 
TOKO, INC |
| 描述： | LOW DROPOUT VOLTAGE REGULATOR |
| 文件： | 总15页 (文件大小：116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TK715xxAS
LOW DROPOUT VOLTAGE REGULATOR
FEATURES
APPLICATIONS
n Battery Powered Systems
n High Voltage Precision at ± 2.0% or ± 60 mV
n Very Low Quiescent Current
n Very Low Dropout Voltage
n Cellular Telephones
n Pagers
n Personal Communications Equipment
n Portable Instrumentation
n Portable Consumer Equipment
n Radio Control Systems
n Toys
n Reverse Voltage Protection
n Miniature Package (SOT23-3)
n Short Circuit Protection
n High Ripple Rejection
n Can use Multilayer Ceramic Capacitors
n 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
internalreversebiasprotectioneliminatestherequirement
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
V
OUT
V
IN
20P
30T
GND
ORDERING INFORMATION
TK715 ASCL
Tape/ Reel Code
Temp. Code
Voltage Code
BLOCK DIAGRAM
Package Code
VOLTAGE CODE
TEMPERATURE CODE
C -30 to +80 °C
TAPE/REEL CODE
L: Tape Left
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
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
V
IN
V
OUT
PACKAGE CODE
S : SOT-23-3
THERMAL
PROTECTION
-
-
+
+
BANDGAP
REFERENCE
GND
March 2001 TOKO, Inc.
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
IQ
PARAMETER
Quiescent Current
Ground Pin Current
Output Voltage
TEST CONDITIONS
IOUT = 0 mA
MIN
TYP
25
MAX
45
UNITS
µA
µA
V
IGND
IOUT = 15 mA
300
500
VOUT
IOUT = 5 mA
See Table 1
3
Line Reg
Line Regulation
VIN = VOUT(TYP) + 1 V to VOUT(TYP) + 6 V
IOUT = 5 to 100 mA, (Note 2)
12
36
mV
mV
V
Load Reg Load Regulation
18
IOUT = 50 mA
0.105
0.16
0.16
155
0.18
0.28
0.30
VDROP
Dropout Voltage (Note 5)
IOUT = 100 mA, 2.4 V £ VOUT £ 5.0 V
IOUT = 100 mA, 2.1 V £ VOUT £ 2.4 V
V
V
115
70
IOUT(MAX)
Continuous Output Current
mA
90
1.8 V £ Vin £ 2.1 V (Note 3)
RR
Ripple Rejection
(Note 4)
60
dB
Temperature Coefficient
IOUT = 5 mA
30
ppm/°C
∆VOUT / ∆T
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
OUT £ 2.0 V at the minimum input operating voltage is not preferred.
V
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
Quiescent Current
TEST CONDITIONS
IOUT = 0 mA
MIN
TYP
32
MAX
60
UNITS
µA
IQ
IGND
Ground Pin Current
Output Voltage
IOUT = 15 mA
IOUT = 5 mA
300
500
µA
VOUT
See Table 1
V
VIN = VOUT(TYP) + 1 V to
VOUT(TYP) + 6 V or Max 18 V
Line Reg
Load Reg
Line Regulation
Load Regulation
3
12
mV
IOUT = 5 to 100 mA, (Note 2)
IOUT = 50 mA
35
0.105
0.160
155
60
80
mV
V
0.18
0.28
VDROP
Dropout Voltage
IOUT = 100 mA
V
IOUT(MAX)
RR
Continuous Output Current
Ripple Rejection
115
mA
dB
(Note 3)
Temperature Coefficient
IOUT = 5 mA
30
ppm/°C
∆VOUT / ∆T
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
Voltage
Code
VOUT(MIN)
VOUT(MAX)
Test
Voltage
Output
Voltage
Voltage
Code
VOUT(MIN)
VOUT(MAX)
Test
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
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
60
70
80
90
3.440 V
3.530 V
3.630 V
3.730 V
3.830 V
3.930 V
4.030 V
4.130 V
4.230 V
4.330 V
4.430 V
4.530 V
4.630 V
4.730 V
4.830 V
4.930 V
5.880 V
6.860 V
7.840 V
8.820 V
3.560 V
3.670 V
3.770 V
3.870 V
3.970 V
4.070 V
4.170 V
4.270 V
4.370 V
4.470 V
4.570 V
4.670 V
4.770 V
4.870 V
4.970 V
5.070 V
6.120 V
7.140 V
8.160 V
9.180 V
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
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
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
1.440 V
1.540 V
1.640 V
1.740 V
1.840 V
1.940 V
2.040 V
2.140 V
2.240 V
2.340 V
2.440 V
2.540 V
2.640 V
2.740 V
2.840 V
2.940 V
3.040 V
3.140 V
3.240 V
3.340 V
1.560 V
1.660 V
1.760 V
1.860 V
1.960 V
2.060 V
2.160 V
2.260 V
2.360 V
2.460 V
2.560 V
2.660 V
2.760 V
2.860 V
2.960 V
3.060 V
3.160 V
3.260 V
3.360 V
3.460 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
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
Page 4
March 2001 TOKO, Inc.
TK715xxAS
TEST CIRCUIT
I
IN
V
V
IN
OUT
V
IN
C
L
C
V
OUT
I
IN
0.1 µF
OUT
1.0 µF
TANTALUM
GND
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
LOAD REGULATION
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
SHORT CIRCUIT CURRENT
V
TYPICAL
OUT
5
4
3
2
V
TYPICAL
OUT
I
= 0 mA
OUT
I
= 50 mA
OUT
I
= 100 mA
OUT
50 mV/DIV
1
0
V
= V
OUT
IN
0
50
(mA)
100
0
0
100
200
V
IN
(V)
I
I
(mA)
OUT
OUT
INPUT CURRENT VS.
INPUT VOLTAGE
REVERSE BIAS CURRENT RANGE
LINE REGULATION
I
= 0 mA
(VIN = 0 V)
OUT
2
V
TYPICAL
100
OUT
Because the output voltage is
different, the reverse current
will change this area.
80
60
40
V
= 2.0 V
OUT
1
0
V
= 3 V
OUT
20
0
V
OUT
= 8.0 V
0
5
10
0
10
(V)
20
0
5
REV
10
V (V)
IN
V
V
(V)
IN
March 2001 TOKO, Inc.
Page 5
TK715xxAS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
DROPOUT VOLTAGE VS.
TEMPERATURE
GROUND PIN CURRENT vs.
OUTPUT CURRENT
250
200
500
0
400
300
200
I
= 100 mA
OUT
150
100
-100
-200
I
= 50 mA
OUT
50
0
100
0
-50
0
50
100
0
5
10
(mA)
15
0
50
100
T (°C)
I
I
(mA)
A
OUT
OUT
GROUND PIN CURRENT vs.
OUTPUT CURRENT
OUTPUT VOLTAGE VS.
TEMPERATURE
MAX OUTPUT CURRENT
5
4
3
2
20
10
0
180
160
140
3.0 V
3.0 V
-10
120
1
0
-20
-30
100
0
0
20
40
OUT
60
(mA)
80
100
-50
0
50
100
-50
0
50
100
I
T
(°C)
T
(°C)
A
A
Ripple Rejection
RIPPLE REJECTION
0
-10
-20
V
IN
V
OUT
----TANTALUM
1.0 µF : 4.7 µF
715xxA
C
L
-30
0.1 µF
1.0 µF
2.2 µF
4.7 µF
I
= 10 mA
-40
-50
OUT
(TANTALUM OR CERAMIC)
-60
GND
-70
-80
-90
CERAMIC
2.2 µF : 4.7 µF
RIPPLE REJECTION CIRCUIT
-100
0.01 0.1
1
10 100
1000
F (kHz)
Page 6
March 2001 TOKO, Inc.
TK715xxAS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
Output Noise
NOISE LEVEL (TK71530A) VS.
OUTPUT CURRENT
V
IN
V
OUT
715xxA
C
= 1 µF
250
200
150
100
L
C
L
C
= 2.2 µF
L
0.1 µF
1.0 µF
2.2 µF
4.7 µF
10 µF
C
L
= 4.7 µF
C
= 10 µF
L
(TANTALUM)
GND
OUTPUT NOISE CIRCUIT
50
0
BW = 400 Hz~80 KHz
1.0
5.0
(mA)
10
I
OUT
Load & Line Response
LOAD CURRENT
STEP RESPONSE
LINE VOLTAGE STEP RESPONSE
50 mA
V
+ 2V
OUT
I
V
OUT
IN
5 mA
V
+ 1V
OUT
C
= 1.0 µF
L
C
= 1.0 µF
L
25 µS/DIV
25 µS/DIV
V
V
OUT
OUT
50 mV/DIV
50 mV/DIV
I
= 10mA
OUT
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
RIPPLE REJECTION RATIO (RR)
OUTPUT VOLTAGE (VOUT
)
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.
The output voltage is specified with VIN = (VOUT(TYP) + 1 V)
and IOUT = 5 mA.
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
dependentupontheloadcurrentandthejunctiontempera-
ture.
REVERSE VOLTAGE PROTECTION
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 re-
mains charged and the input is reduced to zero, or when
an external voltage higher than the input voltage is applied
to the output side.
CONTINUOUS OUTPUT CURRENT (IOUT
)
Normal operating output current. This is limited by pack-
age power dissipation.
REDUCTION OF OUTPUT NOISE
LINE REGULATION (Line Reg)
Although the architecture of the Toko regulators are de-
signed 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 af-
fected by the value of the capacitors and bench testing is
recommended when deviating from standard values.
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.
LOAD REGULATION (Load Reg)
PACKAGE POWER DISSIPATION (PD)
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 con-
dition 5 mA to 100 mA.
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 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
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 control
current.
Page 8
March 2001 TOKO, Inc.
TK715xxAS
DEFINITION AND EXPLANATION OFTECHNICALTERMS (CONT.)
determine the power dissipation for shutdown when
mounted, attach the device on the actual PCB and delib-
erately increase the output current (or raise the input
voltage) until the thermal protection circuit is activated.
Calculate the power dissipation of the device by subtract-
ing the output power from the input power. These mea-
surements 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
thermalresistancewhenmountedisexpressedasfollows:
2)
3)
4)
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)
operating temperature (e.g., 75 °C) to the derating curve.
6)
the vertical line intersects the derating curve. This is taken
as the maximum power dissipation, DPD
In design, take a vertical line from the maximum
Read off the value of PD against the point at which
.
The maximum operating current is:
I
OUT = (DPD / (VIN(MAX) - VOUT)
500
Tj = 0jA x PD + TA
MOUNTED AS SHOWN
FREE AIR
400
300
200
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
100
0
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
50
100
150
T
(°C)
A
SOT23-3 POWER DISSIPATION CURVE
The range of usable currents can also be found from the
graph below.
(mW)
3
P
D
6
D
PD
4
5
25
50
75
(°C)
150
T
A
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
C
= 0.1 µF
0.68 µF ≤ C ≤ 4.7 µF or More
IN
L
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
C
= 0.68 µF
L
MLCC
or More
C
= 4.7 µF
MLCC
L
Stable area is
above the line
ESR ≥ 0.01 Ω
1.0 µF
2.2 µF
3.3 µF
0
20
40
60
80
100
I
(mA)
OUT
UNSTABLE AREA UNDER
AND TO THE LEFT
V
V
V
³ 2.8V IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 0.68 mF
³ 2.0V IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 1.0 mF
³ 1.5V IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 4.7 mF
Range which can be used:
OUT
OUT
OUT
TANTALUM CAP
5.0
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
0.1 µF ≤ C ≤ 0.22 µF or More
L
C
= 0.1 µF
TANTALUM
L
Stable area is
above the line
C
= 0.22 µF ( or More
TANTALUM)
L
ESR ≥ 1.0 Ω
0.1 µF
0
20
40
60
(mA)
80
100
I
OUT
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)
R
OUT
V
OUT
V
IN
TK715xxA
C
OUT
LOAD ADJ.
= 20, 30, 40 mA
I
OUT
C
= 2.2 µF
L
MEASUREMENT CONDITION
OUTPUT SIDE CAPACITOR (COUT
)
UNITS
µF
IOUT
ROUT
0
VOUT
10 µF
210 µV
76 µV
47 µF
150 µV
50 µV
55 µV
60 µV
100 µF
COUT
IOUT = 20 - 40 mA
20 mA
3.500 V
3.296 V
3.287 V
3.266 V
130 µV
40 µV
48 µV
48 µV
RMS
RMS
RMS
RMS
10 W
6.8 W
5.1 W
NOISE
30 mA
88 µV
40 mA
100 µV
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.
V
OUT
V
IN
R
IN
TK715xxA
C
L
LOAD ADJ.
= 20, 30, 40 mA
I
OUT
C
IN
March 2001 TOKO, Inc.
Page 11
TK715xxAS
APPLICATION INFORMATION (CONT)
R(*) MAG -17.98 dB 10 dB/
-50.00 dB
-50.00 dB
R(*) MAG -57.78 dB 10 dB/
-50.00 dB
-50.00 dB
B(*) B
-41.05 dB 10 dB/
B(*) B
-41.05 dB 10 dB/
TK71533
FILTER
= 27 Ω = 47 µF
IN
R
IN
C
FILTER + TK71533
R
IN
= 27 Ω
C
IN
= 47 µF CL = 10 µF
START: 100 Hz
OUT (B): -20.00 dBm ST: AUTO x1
IRG: 26 dBm RBW: 30 kHZ VBW: 38 kHz
STOP: 1 MHz
START: 100 Hz
OUT (B): -20.00 dBm ST: AUTO x1
IRG: 26 dBm RBW: 30 kHZ VBW: 38 kHz
STOP: 1 MHz
1 MΩ
1 MΩ
TEMPERATURE DEPENDENCY
VOLTAGE DEPENDENCY
100
100
B CURVE
B CURVE
90
80
70
60
50
40
90
80
70
60
50
F CURVE
F CURVE
-50
-25
0
25
(°C)
50
75
100
0
2
4
6
8
10
BIAS V (V)
T
A
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
V
IN
GND
V
OUT
+
+
500
400
300
RECOMMENDED AS SHOWN
FREE AIR
200
100
March 2001 TOKO, Inc.
Page 13
TK715xxAS
APPLICATION INFORMATION (CONT.)
REVERSE VOLTAGE PROTECTION
SWITCHING OPERATION
Theinternalreversebiasprotectioneliminatestherequire-
ment 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 simulta-
neously, the highest output voltage will be present.
V
IN
V
IN
V
OUT
TK71530A
715xxAS
V
V
IN
OUT
3.0 OR 2.8 V
TK71528A
GND
Another reverse voltage protection technique is illustrated
below. The extra diode and extra capacitor are not neces-
sary with the TK715xxA. The high output voltage accuracy
is maintained because the diode forward voltage varia-
tions over temperature and load current have been elimi-
nated.
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 pro-
tection and thermal sensor do not protect the external
transistor.
V
OUT
V
IN
TK715xxAS
V
IN
V
IN
V
OUT
TK715xxA
150 Ω
PARALLEL OPERATION
3.3 µF
0.22 µF
TheseriesresistorRisputintheinputlineofthelowoutput
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.
V
IN
5 V
3 V
TK71550A
TK71530A
R
2 V
TK71520A
Page 14
March 2001 TOKO, Inc.
TK715xxAS
PACKAGE OUTLINE
Marking Information
SOT23-3
Product Code T Voltage Code
0.8
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
3
Marking
e
e
0.95 0.95
VOLTAGE CODE
PRODUCT CODE
e1
1.90
+ 0.15
0.05
Recommended Mounting Pad
0.4
C1
0.1
e
e
0.95
0.95
1
2
1.6
2.9
0.4
0.1
±0.3
2.8
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.
Western Regional Office
Toko America, Inc.
SemiconductorTechnicalSupport
Toko Design Center
1250FeehanvilleDrive
Mount Prospect, IL 60056
Tel:(847)297-0070
2480 North First Street , Suite 260
San Jose, CA 95131
Tel:(408)432-8281
4755ForgeRoad
Colorado Springs, CO 80907
Tel:(719)528-2200
Fax:(847)699-7864
Fax:(408)943-9790
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.
Page 15
© 1999 Toko, Inc.
Printed in the USA
IC-xxx-TK715xx
0798O0.0K
All Rights Reserved
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