TOKO TK71750SCL, TK71748SCL, TK71749SCL, TK71747SCL, TK71746SCL Datasheet

October 2001 TOKO, Inc. Page 1

TK717xxS

n Very Good Stability (CL = 0.22 mF is Stable For

Any Type Capacitor withV

OUT

³ 1.8 V)

n Built-in Shunt Circuit of Output to GND. The Stored

Energy of the Output Capacitor is Discharged
Quickly

n Wide Operating Voltage Range (1.8 V ~ 14 V)
n Very Low Dropout Voltage (V

DROP

= 103 mV at

100 mA)

n Peak Output Current is 370 mA (0.3 V DROP Point)
n Very Low Quiescent Current (I

Q

= 72 uA at I

OUT

= 0 mA)

n Good Ripple Rejection Ratio (80 dB at 1 kHz)
n High Precision Output Voltage (± 1.5 % or ± 50 mV)
n Suitable for Very Low Noise Applications
n Built-in Active High On/Off Control (0.1 mA Max

Standby Current)

n Built-in Short Circuit Protection
n Built-in Thermal Shutdown
n Very Small Surface Mount Package (SOT23-5)

BLOCK DIAGRAM

TK717xxS

LOW DROPOUT VOLTAGE REGULATOR

FEATURES

APPLICATIONS

n Battery Powered Systems
n Measurement Systems
n Mobile Communications Systems
n Cordless Phone, PHS, GSM, CDMA
n Industrial Equipment
n Personal Computers, Barcode Readers

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

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.

CONTROL

GND

V

IN

+

-

BANDGAP

REFERENCE

THERMAL &

OVER CURRENT

PROTECTION

NOISE

BYPASS

CONTROL CIRCUIT

CONSTANT

CURRENT

SOURCE

V

OUT

AUTO

DISCHARGE

CIRCUIT

GND

V

IN

NOISE

BYPASS

V

OUT

CONTROL

TK717 S L

Voltage Code

ORDERING INFORMATION

Package Code

PACKAGE CODE
S: SOT23-5

VOLTAGE CODE

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

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

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

Operating Temp. Range

Tape/Reel Code

OPERATING TEMP. RANGE
C: -30 ~ 80°C

TAPE/REEL CODE
L: Tape Left

0

1

S

Page 2 October 2001 TOKO, Inc.

TK717xxS

ABSOLUTE MAXIMUM RATINGS

Supply Voltage............................................... -0.4 to16 V

Power Dissipation (Note 1) ................................. 500 mW

Reverse Bias Voltage ..................................... -0.4 to 6 V

Operating Voltage Range ............................... 1.8 to 14 V

Storage Temperature Range .....................-55 to +150 °C

Operating Temperature Range..................... -30 to +80 °C

Noise Bypass Pin Voltage .............................. -0.4 to 5 V

Control Pin Voltage ....................................... -0.4 to 16 V

Short Circuit Current............................................ 410 mA

TK717xxSCL ELECTRICAL CHARACTERISTICS

Test conditions: TA = 25 °C, unless otherwise specified.

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October 2001 TOKO, Inc. Page 3

TK717xxS

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TK717xxSCL ELECTRICAL CHARACTERISTICS (CONT.)

Test conditions: TA = 25 °C, unless otherwise specified.

Note 1: Power dissipation is 150 mW in free air. Power dissipation is 500 mW when mounted as recommended. Derate at 4.0 mW/°C for operation

above 25°C.
Note 2: This value depends on the output voltage. This is a reference value for a 3 V output device.
Note 3: The input current decreases to the pA level by connecting the control terminal to GND.
Note 4: The pull-down resistor is not built-in.
Note 5: The minimum operating voltage for VIN can be 1.8 V. Also, the minimum voltage required for VIN is VIN = V

DROP

+ V

OUT

. As a result, operating

at V

OUT

£ 2.0 V at the mimimum input operating voltage is not preferred.
General Note: The operation of -30 °C to 80 °C is guaranteed by design (verified by sample inspection).
General Note: Exceeding the “Absolute Maximum Rating “may damage the device.
General Note: Output noise is 0.20 mV/ ÖHz typical at 1 kHz: BW 400 to 30 kHz and 30 ~ 60 m Vrms.
General Note: Connecting a capacitor to the noise by pass pin will decrease the output noise voltage.

Page 4 October 2001 TOKO, Inc.

TK717xxS

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V4.242V053.2V054.2V4.3V2.424V731.4V362.4V2.5
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V2.323V051.3V052.3V2.4V0.505V529.4V570.5V0.6

TK717xxSCL ELECTRICAL CHARACTERISTICS TABLE 1

Test Conditions: VIN = V

OUT(TYP)

+ 1 V, I

OUT

= 5 mA, TA = 25 °C, unless otherwise specified.

The output voltage table indicates the standard value when manufactured.