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PDF TK71543AS Data sheet ( Hoja de datos )
| Número de pieza | TK71543AS | |
| Descripción | LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | TOKO | |
| Logotipo |  |
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TK715xxAS
FEATURES
n High Voltage Precision at ± 2.0% or ± 60 mV
n Very Low Quiescent Current
n Very Low Dropout Voltage
n Reverse Voltage Protection
n Miniature Package (SOT23-3)
n Short Circuit Protection
n High Ripple Rejection
n Can use Multilayer Ceramic Capacitors
LOW DROPOUT VOLTAGE REGULATOR
APPLICATIONS
n Battery Powered Systems
n Cellular Telephones
n Pagers
n Personal Communications Equipment
n Portable Instrumentation
n Portable Consumer Equipment
n Radio Control Systems
n Toys
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
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
VIN VOUT
3020TP
GND
ORDERING INFORMATION
TK715 ASCL
Voltage Code
Tape/ Reel Code
Temp. Code
Package Code
VOLTAGE CODE
15 = 1.5 V
35 = 3.5 V
16 = 1.6 V
36 = 3.6 V
17 = 1.7 V
37 = 3.7 V
18 = 1.8 V
38 = 3.8 V
19 = 1.9 V
39 = 3.9 V
20 = 2.0 V
40 = 4.0 V
21 = 2.1 V
41 = 4.1 V
22 = 2.2 V
42 = 4.2 V
23 = 2.3 V
43 = 4.3 V
24 = 2.4 V
44 = 4.4 V
25 = 2.5 V
45 = 4.5 V
26 = 2.6 V
46 = 4.6 V
27 = 2.7 V
47 = 4.7 V
28 = 2.8 V
48 = 4.8 V
29 = 2.9 V
49 = 4.9 V
30 = 3.0 V
50 = 5.0 V
31 = 3.1 V
60 = 6.0 V
32 = 3.2 V
70 = 7.0 V
33 = 3.3 V
80 = 8.0 V
34 = 3.4 V
90 = 9.0 V
TEMPERATURE CODE
C -30 to +80 °C
PACKAGE CODE
S : SOT-23-3
TAPE/REEL CODE
L: Tape Left
VIN
BLOCK DIAGRAM
THERMAL
PROTECTION
-
+
BANDGAP
REFERENCE
-
+
VOUT
GND
March 2001 TOKO, Inc.
Page 1
1 page  
TK715xxAS
TEST CIRCUIT
IIN
VIN
CIN
0.1 µF
VIN VOUT
CL
1.0 µF
TANTALUM
IOUT
VOUT
GND
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
LOAD REGULATION
SHORT CIRCUIT CURRENT
OUTPUT VOLTAGE vs.
INPUT VOLTAGE
VOUT TYPICAL
5
4
3
VOUT TYPICAL
IOUT = 0 mA
IOUT = 50 mA
2
IOUT = 100 mA
1 50 mV/DIV
VIN = VOUT
0
50
100
0
0
100 200 0
IOUT (mA)
IOUT (mA)
VIN (V)
LINE REGULATION
VOUT TYPICAL
0 10 20
VIN (V)
REVERSE BIAS CURRENT RANGE
100
80
(VIN = 0 V)
Because the output voltage is
different, the reverse current
will change this area.
VOUT = 2.0 V
60
40
20
0
0
VOUT = 8.0 V
5
VREV (V)
10
INPUT CURRENT VS.
INPUT VOLTAGE
2 IOUT = 0 mA
1
VOUT = 3 V
0
0 5 10
VIN (V)
March 2001 TOKO, Inc.
Page 5
5 Page 
APPLICATION INFORMATION (CONT)
TK715xxAS
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)
VIN VOUT ROUT
TK715xxA
CL = 2.2 µF
COUT
LOAD ADJ.
IOUT = 20, 30, 40 mA
MEASUREMENT CONDITION
IOUT
IOUT = 20 - 40 mA
20 mA
ROUT
0
10 W
VOUT
3.500 V
3.296 V
30 mA
6.8 W
3.287 V
40 mA
5.1 W
3.266 V
OUTPUT SIDE CAPACITOR (COUT)
10 µF
47 µF
100 µF
210 µV
150 µV
130 µV
76 µV
50 µV
40 µV
88 µV
55 µV
48 µV
100 µV
60 µV
48 µV
UNITS
µF
RMS
RMS
RMS
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 VIN
VOUT
TK715xxA
CIN
CL
LOAD ADJ.
IOUT = 20, 30, 40 mA
March 2001 TOKO, Inc.
Page 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TK71543AS.PDF ] | |
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