TK111xxS
VOLTAGE REGULATOR WITH ON/OFF SWITCH
APPLICATIONS
FEATURES
■ High Voltage Precision at ± 2.0% or ± 60 mV
■ Active High On/Off Control
■ Battery Powered Systems
■ Cellular Telephones
■ Pagers
■ Very Low Dropout Voltage (85 mV at 30 mA)
■ Very Low Noise
■ Personal Communications Equipment
■ Portable Instrumentation
■ Portable Consumer Equipment
■ Radio Control Systems
■ Toys
■ Miniature Package (SOT-23-5)
■ Internal Thermal Shutdown
■ Short Circuit Protection
■ Excellent Ripple Rejection (70 dB @ 1 kHz)
■ Reverse Bias Protection
DESCRIPTION
TheTK111xxSisalowdropoutlinearregulatorwithabuilt-
in electronic switch. The internal switch can be controlled
byTTLorCMOSlogiclevels. Thedeviceisinthe“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.
TK111xxS
V
V
CONTROL
GND
IN
20P
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.
NOISE BYPASS
OUT
TheTK111xxSisavailableinaminiatureSOT-23-5surface
mount package.
BLOCK DIAGRAM
ORDERING INFORMATION
V
V
OUT
IN
5
TK111 S L
THERMAL
PROTECTION
Tape/Reel Code
Voltage Code
Temp. Code
Package Code
CONTROL
Note 1: 2.0 to 2.3 V
available in C
temperature code
(-30 to +80 °C) only
VOLTAGE CODE
TAPE/REEL CODE
L: Tape Left
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
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
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
PACKAGE CODE
S: SOT-23-5
BANDGAP
REFERENCE
GND
TEMP. CODE
C: -30 to +80 °C
I: -40 to +85 °C
NOISE
BYPASS
March 1999 TOKO, Inc.
Page 1