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TK11121S Schematic ( PDF Datasheet ) - TOKO

Teilenummer TK11121S
Beschreibung VOLTAGE REGULATOR WITH ON/OFF SWITCH
Hersteller TOKO
Logo TOKO Logo 




Gesamt 16 Seiten
TK11121S Datasheet, Funktion
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






TK11121S Datasheet, Funktion
TK111xxS
VIN
IIN
TEST CIRCUIT
CIN
1 µF
VIN
VOUT
CL
2.2 µF
TANTALUM
ESR = 1.6
IOUT
VCONT
CONT
ICONT
NOISE BYPASS
CN = 0.0047 µF
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
LOAD REGULATION
SHORT CIRCUIT CURRENT
OUTPUT VOLTAGE VS.
INPUT VOLTAGE
5 VOUT TYPICAL
VOUT TYPICAL
4
3
2
1
IOUT = 0 mA
IOUT = 30 mA
IOUT = 60 mA
IOUT = 90 mA
0
0
50 100 0
150 300 0
VIN = VOUT
IOUT (mA)
IOUT (mA)
VIN (V) (50 mV/ DIV)
LINE REGULATION
VOUT TYPICAL
0 10 20
VIN (V)
DROPOUT VOLTAGE VS.
OUTPUT CURRENT
0
-100
-200
-300
-400
-500
0
100
IOUT (mA)
200
GROUND CURRENT VS.
OUTPUT CURRENT
10
8
6
4
2
0
0 75 150
IOUT (mA)
Page 6
March 1999 TOKO, Inc.

6 Page









TK11121S pdf, datenblatt
TK111xxS
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output capacitors in order to maintain regulator loop stability. The recommended
minimum value of the input capacitor is 0.1 µF. The output capacitor should be selected within the Equivalent Series
Resistance (ESR) range as shown in the graphs below for stable operation. When a ceramic capacitor is connected in
parallel with the output capacitor, a maximum of 1000 pF is recommended. This is because the ceramic capacitor's
electrical characteristics (capacitance and ESR) vary widely over temperature. If a large ceramic capacitor is used, a
resistor should be connected in series with it to bring it into the stable operating area shown in the graphs below. Minimum
resistance should be added to maintain load and line transient response.
Note: It is very important to check the selected manufacturers electrical characteristics (capacitance and ESR) over
temperature.
111xxS
CL
ESR
TK111xxS
CL
ESR
Note: It is not necessary to connect a ceramic capacitor in parallel
with an aluminum or tantalum output capacitor.
CL = 1 µF
100
CL = 2.2 µF
100
CL = 3.3 µF
100
CL = 10 µF
100
10
STABLE
1
OPERATION
AREA
0.1
10
STABLE
1 OPERATION
AREA
0.1
10
STABLE
1
OPERATION
AREA
0.1
10
STABLE
1
OPERATION
AREA
0.1
0 .01
1
50
IOUT (mA)
100
130
0 .01
1
50
IOUT (mA)
100
130
0 .01
1
50
IOUT (mA)
100
130
0 .01
1
50
IOUT (mA)
100
130
Page 12
March 1999 TOKO, Inc.

12 Page





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