TK717xxS
LOW DROPOUT VOLTAGE REGULATOR
FEATURES
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Very Good Stability (CL = 0.22
mF
is Stable For
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Any Type Capacitor withV
OUT
³
1.8 V)
Built-in Shunt Circuit of Output to GND. The Stored
Energy of the Output Capacitor is Discharged
Quickly
Wide Operating Voltage Range (1.8 V ~ 14 V)
Very Low Dropout Voltage (V
DROP
= 103 mV at
100 mA)
Peak Output Current is 370 mA (0.3 V DROP Point)
Very Low Quiescent Current (I
Q
= 72 uA at I
OUT
= 0 mA)
Good Ripple Rejection Ratio (80 dB at 1 kHz)
High Precision Output Voltage (± 1.5 % or ± 50 mV)
Suitable for Very Low Noise Applications
Built-in Active High On/Off Control (0.1
mA
Max
Standby Current)
Built-in Short Circuit Protection
Built-in Thermal Shutdown
Very Small Surface Mount Package (SOT23-5)
APPLICATIONS
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Battery Powered Systems
Measurement Systems
Mobile Communications Systems
Cordless Phone, PHS, GSM, CDMA
Industrial Equipment
Personal Computers, Barcode Readers
low quiescent current of 72
mA
at no load and 0.8 mA with
a 50 mA load. The standby current is typically 100 pA. The
circuit features very good stability. The ripple rejection is 90
dB at 400 Hz and 80 dB at 1 kHz. Stable operation is
achieved with an output capacitor as low as 0.22
mF;
a
capacitor of any type may be used. (However, the larger the
output capacitor is, the better the overall characteristics will
be.)
The TK717xxS is available in a very small SOT23-5 surface
mount package.
TK717xxS
VIN
GND
VOUT
DESCRIPTION
TK717xxS 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. In the OFF
state, the output impedance becomes very low, quickly
discharging the output capacitor. An external capacitor can
be connected to the noise bypass pin to lower the output
noise level to 30 ~ 50
mV
RMS
. An internal PNP pass transistor
is included to achieve a low dropout voltage of 103 mV at
100 mA load current. The TK717xx has an exceptionally
01 S
CONTROL
NOISE
BYPASS
ORDERING INFORMATION
BLOCK DIAGRAM
TK717
Voltage Code
Package Code
S L
VIN
VOUT
CONTROL CIRCUIT
CONTROL
CONSTANT
CURRENT
SOURCE
-
+
Tape/Reel Code
Operating Temp. Range
VOLTAGE CODE
15 = 1.5 V
16 = 1.6 V
17 = 1.7 V
18 = 1.8 V
19 = 1.9 V
20 = 2.0 V
21 = 2.1 V
22 = 2.2 V
23 = 2.3 V
24 = 2.4 V
25 = 2.5 V
26 = 2.6 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 =
43 =
44 =
45 =
46 =
47 =
48 =
49 =
50 =
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
TAPE/REEL CODE
L: Tape Left
OPERATING TEMP. RANGE
C: -30 ~ 80°C
PACKAGE CODE
S: SOT23-5
BANDGAP
REFERENCE
THERMAL &
OVER CURRENT
PROTECTION
AUTO
DISCHARGE
CIRCUIT
GND
NOISE
BYPASS
October 2001 TOKO, Inc.
Page 1
TOKO [ TOKO, INC ]
