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PDF TK11124S Data sheet ( Hoja de datos )

Número de pieza TK11124S
Descripción VOLTAGE REGULATOR WITH ON/OFF SWITCH
Fabricantes TOKO 
Logotipo TOKO Logotipo



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No Preview Available ! TK11124S Hoja de datos, Descripción, Manual

TK111xxS
VOLTAGE REGULATOR WITH ON/OFF SWITCH
FEATURES
s High Voltage Precision at ± 2.0% or ± 60 mV
s Active High On/Off Control
s Very Low Dropout Voltage (85 mV at 30 mA)
s Very Low Noise
s Miniature Package (SOT-23-5)
s Internal Thermal Shutdown
s Short Circuit Protection
s Excellent Ripple Rejection (70 dB @ 1 kHz)
s Reverse Bias Protection
DESCRIPTION
APPLICATIONS
s Battery Powered Systems
s Cellular Telephones
s Pagers
s Personal Communications Equipment
s Portable Instrumentation
s Portable Consumer Equipment
s Radio Control Systems
s Toys
The TK111xxS is a low dropout linear regulator with a built-
in electronic switch. The internal switch can be controlled
by TTL or CMOS logic levels. The device is in the “on” state
when the control pin is pulled to a logic high level. An
external capacitor can be connected to the noise bypass
pin to lower the output noise level to 30 µVrms.
An internal PNP pass transistor is used to achieve a low
dropout voltage of 85 mV (typ.) at 30 mA load current. The
TK111xxS has a very low quiescent current of 140 µA
(typ.) at no load . The standby current is 100 nA maximum.
The internal thermal shut down circuitry limits the junction
temperature to below 150 °C. The load current is internally
monitored and the device will shut down in the presence of
a short circuit or overcurrent condition at the output.
The TK111xxS is available in a miniature SOT-23-5 surface
mount package.
ORDERING INFORMATION
TK111 S L
Voltage Code
Tape/Reel Code
Temp. Code
Package Code
VOLTAGE CODE
20 = 2.0 V
32 = 3.2 V
21 = 2.1 V
33 = 3.3 V
22 = 2.2 V
34 = 3.4 V
23 = 2.3 V
35 = 3.5 V
24 = 2.4 V
36 = 3.6 V
25 = 2.5 V
37 = 3.7 V
27 = 2.7 V
38 = 3.8 V
28 = 2.8 V
39 = 3.9 V
29 = 2.9 V
40 = 4.0 V
30 = 3.0 V
41 = 4.1 V
31 = 3.1 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
Note 1: 2.0 to 2.3 V
available in C
temperature code
(-30 to +80 °C) only
TAPE/REEL CODE
L: Tape Left
PACKAGE CODE
S: SOT-23-5
TEMP. CODE
C: -30 to +80 °C
I: -40 to +85 °C
20P
VIN 5
CONTROL
March 1999 TOKO, Inc.
TK111xxS
CONTROL
GND
NOISE BYPASS
BLOCK DIAGRAM
THERMAL
PROTECTION
BANDGAP
REFERENCE
NOISE
BYPASS
VIN
VOUT
VOUT
GND
Page 1

1 page




TK11124S pdf
TK111xxS
TK111xxSIL ELECTRICAL CHARACTERISTICS TABLE 2
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 30 mA, unless otherwise specified.
Output
Voltage
Voltage
Code
Room Temp. Range (TA = 25 °C)
VOUT(MIN)
VOUT(MAX)
Full Temp. Range (TA = -40 to +85 °C)
VOUT(MIN)
VOUT(MAX)
2.4 V
2.5 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
4.5 V
4.6 V
4.7 V
4.8 V
4.9 V
5.0 V
24
2.340 V
2.460 V
2.305 V
2.495 V
25
2.440 V
2.560 V
2.405 V
2.595 V
27
2.640 V
2.760 V
2.605 V
2.795 V
28
2.740 V
2.860 V
2.705 V
2.895 V
29
2.840 V
2.960 V
2.805 V
2.995 V
30
2.940 V
3.060 V
2.905 V
3.095 V
31
3.038 V
3.162 V
3.007 V
3.193 V
32
3.136 V
3.264 V
3.104 V
3.296 V
33
3.234 V
3.366 V
3.201 V
3.400 V
34
3.332 V
3.468 V
3.298 V
3.502 V
35
3.430 V
3.570 V
3.395 V
3.605 V
36
3.528 V
3.672 V
3.492 V
3.708 V
37
3.626 V
3.774 V
3.589 V
3.811 V
38
3.724 V
3.876 V
3.686 V
3.914 V
39
3.822 V
3.988 V
3.783 V
4.017 V
40
3.920 V
4.080 V
3.880 V
4.120 V
41
4.018 V
4.182 V
3.977 V
4.223 V
42
4.116 V
4.284 V
4.074 V
4.326 V
43
4.214 V
4.366 V
4.171 V
4.429 V
44
4.312 V
4.488 V
4.268 V
4.532 V
45
4.410 V
4.590 V
4.365 V
4.635 V
46
4.598 V
4.692 V
4.462 V
4.738 V
47
4.696 V
4.794 V
4.559 V
4.841 V
48
4.794 V
4.896 V
4.656 V
4.944 V
49
4.892 V
4.998 V
4.753 V
5.047 V
50
4.900 V
5.100 V
4.850 V
5.150 V
March 1999 TOKO, Inc.
Page 5

5 Page





TK11124S arduino
TK111xxS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
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 SOT-23-5 is increased to 500 mW. For operation at
ambient temperatures over 25 °C, the power dissipation of
the SOT-23-5 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:
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.
The range of usable currents can also be found from the
graph below.
(mW)
PD
3
DPD
6
4
5
25 50 75
TA ( C)
150
Procedure:
1) Find PD
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.
1.0
0.8
0.6
0.4
0.2
0
0
MOUNTED AS
SHOWN
FREE AIR
50 100
TA (°C)
150
SOT-23-5 POWER DISSIPATION CURVE
March 1999 TOKO, Inc.
Page 11

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