TK115xx
VOLTAGE REGULATOR WITH ON/OFF SWITCH
FEATURES
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Low Dropout Voltage
Pass Transistor Terminals Available
Very Low Standby Current ( ON, No Load)
Very Low (<200 nA) Current in OFF Mode
Low Output Noise
Internal Thermal Shutdown
Short Circuit Protection
Available on Tape and Reel
APPLICATIONS
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Cordless Telephones
Pagers
Battery Powered Systems
Personal Communications Equipment
Portable Instrumentation
Radio Control Systems
Toys
Low Voltage Systems
Portable Consumer Equipment
DESCRIPTION
The TK115xx series devices are low power, linear regu-
lators with electronic ON/OFF switches. Both active HIGH
and active LOW control pins are provided.
An internal PNP pass-transistor is used in order to achieve
low dropout voltage (typically 200 mV at 80 mA load
current). A base drive is available at pin 7 for connection
of an external pass transistor should higher current (up to
1 A) or lower dropout voltage is required.
An internal thermal shutdown circuit 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 at the output.
The TK115xx series is available in plastic surface mount
SOP-8 packages.
TK115xxM
V
IN
1
8
7
6
5
V
O
BASE
GND
V
ADJ
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................... 16 V
Load Current ....................................................... 180 mA
Power Dissipation (Note 1) ................................ 600 mW
Storage Temperature Range ................... -55 to +150
°C
Operating Temperature Range .................. -30 to +80
°C
Lead Soldering Temp. (10 sec.) ........................... 260
°C
Junction Temperature .......................................... 150
°C
Note 1: Derate output power by 4.8 mW/°C for operation
above 25
°C.
V
IN
1
S
X
5XA21
HIGH CONTROL 2
LOW CONTROL 3
NC 4
KT115xxM • PO
BLOCK DIAGRAM
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S
ORDERING INFORMATION
TK115
Voltage Code
HIGH
CONTROL 2
(HC)
8
7
V
O
BASE
THERMAL
PROTECTION
S
S
M
Tape/Reel Code
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S
–
+
S
+
S
5 VADJ
S
S
S
VOLTAGE CODE
30 = 3.0 V
32 = 3.25 V
35 = 3.5 V
37 = 3.75 V
40 = 4.0 V
45 = 4.5 V
47 = 4.75 V
50 = 5.0 V
55 = 5.5 V
80 = 8.0 V
TAPE/REEL CODE
BX : Bulk/Bag
TL : Tape Left
MG: Magazine
LOW
CONTROL 3
(LC)
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TK115xx
REFERENCE
VOLTAGE
S
February, 1995 TOKO, Inc.
10-15-94
–
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6
GND
KT115xx • BD01
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