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
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
DESCRIPTION
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.
20P
TK111xxS
CONTROL
GND
NOISE BYPASS
VIN
VOUT
BLOCK DIAGRAM
ORDERING INFORMATION
TK111
Voltage Code
S L
Tape/Reel Code
Temp. Code
Package Code
VIN
5
VOUT
THERMAL
PROTECTION
CONTROL
VOLTAGE CODE
20 = 2.0 V
21 = 2.1 V
22 = 2.2 V
23 = 2.3 V
24 = 2.4 V
25 = 2.5 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
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
C: -30 to +80
°C
I: -40 to +85
°C
BANDGAP
REFERENCE
GND
TEMP. CODE
NOISE
BYPASS
March 1999 TOKO, Inc.
Page 1
TOKO [ TOKO, INC ]
