TK71736SCL - TOKO, Inc. - Product.Network

October 2001 TOKO, Inc. Page 1

TK717xxS

nVery Good Stability (CL = 0.22 mF is Stable For

Any Type Capacitor withVOUT ³ 1.8 V)

nBuilt-in Shunt Circuit of Output to GND. The Stored

Energy of the Output Capacitor is Discharged

Quickly

nWide Operating Voltage Range (1.8 V ~ 14 V)

nVery Low Dropout Voltage (VDROP = 103 mV at

100 mA)

nPeak Output Current is 370 mA (0.3 V DROP Point)

nVery Low Quiescent Current (IQ = 72 uA at IOUT = 0 mA)

nGood Ripple Rejection Ratio (80 dB at 1 kHz)

nHigh Precision Output Voltage (± 1.5 % or ± 50 mV)

nSuitable for Very Low Noise Applications

nBuilt-in Active High On/Off Control (0.1 mA Max

Standby Current)

nBuilt-in Short Circuit Protection

nBuilt-in Thermal Shutdown

nVery Small Surface Mount Package (SOT23-5)

BLOCK DIAGRAM

TK717xxS

LOW DROPOUT VOLTAGE REGULATOR

FEATURES APPLICATIONS

nBattery Powered Systems

nMeasurement Systems

nMobile Communications Systems

nCordless Phone, PHS, GSM, CDMA

nIndustrial Equipment

nPersonal 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 mVRMS. 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

VIN

BANDGAP

REFERENCE

THERMAL &

OVER CURRENT

PROTECTION

NOISE

BYPASS

CONTROL CIRCUIT

CONSTANT

CURRENT

SOURCE

VOUT

AUTO

DISCHARGE

CIRCUIT

GND

VIN

NOISE

BYPASS

VOUT

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

01S

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 = VDROP + VOUT. As a result, operating

at VOUT £ 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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V8.181V057.1V058.1V8.2V6.363V645.3V456.3V6.4

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TK717xxSCL ELECTRICAL CHARACTERISTICS TABLE 1

Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 5 mA, TA = 25 °C, unless otherwise specified.

The output voltage table indicates the standard value when manufactured.

October 2001 TOKO, Inc. Page 5

TK717xxS

TEST CIRCUIT

TYPICAL PERFORMANCE CHARACTERISTICS

Noise Performance

For better noise reduction it is

more effective to increase CN

without increasing CL.

The recommended CN capaci-

tance is 6800 pF or 0.01 mF.

As the output voltage increases,

the noise will also increase.

VIN

VOUT

VCONT ICONT On/Off CONT

CIN = 0.22 µF

Noise Bypass (VREF)

CN = 0.001 µF

CL = 0.22 µF

IOUT

VIN

GND

IIN

NOISE (µVrms)

CN (pF)

0 10 100 1000 10000 100000

300

250

200

150

100

CL = TANTALUM

CL = CERAMIC

♦

♠

CL = 0.2 µF

CL = 0.4 µF

CL = 1.0 µF

CL = 2.2 µF

CL = 10 µF

♦

♠

IOUT = 30 mA

BPF = 400 Hz ~ 80 kHz

TK71730S NOISE vs. CN

NOISE (µVrms)

VOUT (V)

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

NOISE vs VOUT

BPF = 400 Hz ~ 80 kHz

IOUT = 30 mA

CN = 0.01µF

CL = 1.0 µF (TANTALUM)

NOISE (µVrms)

IOUT (mA)

0 25 50 75 100 125 150 175 200

NOISE vs. IOUT

CN = 0.01 µF

CL = 0.22 µF

CL = 0.47 µF

CL = 1.0 µF

CL = 2.2 µF

CL = 10 µF

♦

♠

♦

♠

CL = TANTALUM

FREQUENCY (kHz)

0.01 0.1 1 10 100

0.1

0.01

NOISE vs. FREQUENCY

CN = 0.01 µF

CN = 0.10 µF

TK71730S

CIN = 10 µF

CL = 0.22 µF (CERAMIC)

IOUT = 10 mA

µ V/ Hz

IOUT (mA)

0 25 50 75 100 125 150 175 200

NOISE vs. IOUT

CN = 0.01 µF

CL = 0.22 µF

CL = 0.47 µF

CL = 1.0 µF

CL = 2.2 µF

CL = 10 µF

♦

♠

♦

CL = CERAMIC

NOISE (µVrms)

Page 6 October 2001 TOKO, Inc.

TK717xxS

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

The ripple rejection characteristic depends on the characteristic and the capacitance value of the capacitor connected to

the output side. The RR characteristic of 50 kHz or more varies greatly with the capacitor on the output side and the PCB.

Please confirm your expectations with your actual design, if necessary.

Ripple Rejection

Conditions:

VIN = 5.0 V

VOUT = 3.0 V

IOUT = 10 mA

VRIPPLE = 500 mVp-p

f = 100 Hz TO 1 MHz

CIN = 0 pF

CN = 0.01 mF

RR (dB)

IOUT (mA)

0 25 50 75 100 125 150 175 200

-10

-20

-30

-40

-50

-60

-70

RIPPLE REJECTION vs. IOUT

-80

-90

-100

CN = 0.01 µF

CL = 0.22 µF (Ceramic)

VIN = 5.0 V

VRIPPLE = 500 mVp-p

Freq = 1 kHz

Freq = 400 Hz

VOUT (V)

IOUT (mA)

0 100 200 300 400 500

4.0

3.0

2.0

MAXIMUM OUTPUT CURRENT

5.0

1.0

0.0

RR (dB)

VIN - VOUT _ (TYP) (V)

+0.2 +0.4 +0.6 +0.8 +1

-10

-20

-30

-40

-50

-60

-70

RR AT LOW VOLTAGE

-80

-90

-100

CN = 0.01 µF

CL = 0.22 µF (CERAMIC)

IOUT: 1, 50, 100, 150,

200 mA

IOUT = 200mA

IOUT = 1mA

VIN = VOUT

VDROP (mV)

IOUT (mA)

0 50 100 150 200 250 300

-50

-100

-150

DROP OUT VOLTAGE

-300

-350

-200

-250

TANTALUM CAPACITOR

0.1 1 10 100 1000

FREQUENCY (kHz)

-50

-80

-100

-10

-20

-30

-40

-60

-70

-90

CL = 0.22 µF

CL = 2.2 µF

RR (dB)

MULTILAYER CERAMIC CAPACITOR

0.1 1 10 100 1000

FREQUENCY (kHz)

-50

-80

-100

-10

-20

-30

-40

-60

-70

-90

CL = 0.22 µF

CL = 2.2 µF

RR (dB)

October 2001 TOKO, Inc. Page 7

TK717xxS

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

OUTPUT VOLTAGE (VOUT)

The output voltage is specified with VIN = (VOUT(TYP) + 1 V)

and IOUT = 5 mA.

MAXIMUM OUTPUT CURRENT (IOUT(MAX))

The rated output current is specified under the condition where the

output voltage drops 0.3 V below the value specified with IOUT =

5 mA. This input voltage is set to VOUT(TYP) +1 V, and the current

is pulsed to minimize temperature effect.

DROPOUT VOLTAGE (VDROP)

The dropout voltage is the difference between the input

voltage and the output voltage at which point the regulator

starts to fall out of regulation. Below this value, the output

voltage will fall as the input voltage is reduced. It is

dependent upon the load current and the junction tempera-

ture.

LINE REGULATION (Line Reg)

Line regulation is the ability of the regulator to maintain a

constant output voltage as the input voltage changes. The

line regulation is specified as the input voltage is changed

from VIN = VOUT + 1 V to VIN = VOUT + 6 V.

LOAD REGULATION (Load Reg)

Load regulation is the ability of the regulator to maintain a

constant output voltage as the load current changes. It is a

pulsed measurement to minimize temperature effects with

the input voltage set to VIN = VOUT +1 V. The load regulation

is specified under two output current step conditions of 5 mA

to 100 mA and 5 mA to 200 mA.

QUIESCENT CURRENT (IQ)

The quiescent current is the current which flows through the

ground terminal under no load conditions (IOUT = 0 mA).

RIPPLE REJECTION RATIO (RR)

Ripple rejection is the ability of the regulator to attenuate the

ripple content of the input voltage at the output. It is

specified with 200 mVRMS, 400 Hz and 1 kHz superimposed

on the input voltage, where VIN = VOUT + 1.5 V. The output

decoupling capacitor is set to 1.0 µF, the noise bypass

capacitor is set to 0.01 µF, and the load current is set to 10

mA. Ripple rejection is the ratio of the ripple content of the

output vs. the input and is expressed in dB.

STANDBY CURRENT (ISTBY)

Standby current is the current which flows into the regulator

when the output is turned off by the control function.

OVER CURRENT SENSOR

The overcurrent sensor protects the device if the output is

shorted to ground.

THERMAL SENSOR

The thermal sensor protects the device if the junction

temperature exceeds the safe value (Tj = 150 °C). This

temperature rise can be caused by extreme heat, excessive

power dissipation caused by large output voltage drops, or

excessive output current. The regulator will shut off when

the temperature exceeds the safe value. As the junction

temperature decreases, the regulator will begin to operate

again. Under sustained fault conditions, the regulator output

will oscillate as the device turns off then resets. Damage

may occur to the device under extreme fault conditions.

REVERSE VOLTAGE PROTECTION

Reverse voltage protection prevents damage due to the

output voltage being higher than the input voltage. This fault

condition can occur when the output capacitor remains

charged and the input is reduced to zero, or when an external

voltage higher than the input voltage is applied to the output

side. Toko’s regulators do not need an inherent diode

connected between the input and output.

TK717xxS VOUT

VIN

GND

Page 8 October 2001 TOKO, Inc.

TK717xxS

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

PACKAGE POWER DISSIPATION (PD)

This is the power dissipation level at which the thermal

sensor is activated. The IC contains an internal thermal

sensor which monitors the junction temperature. When the

junction temperature exceeds the monitor threshold of

150 °C, the IC is shut down. The junction temperature rises

as the difference between the input power (VIN x IIN) and the

output power (VOUT x IOUT) increases. The rate of tempera-

ture rise is greatly affected by the mounting pad configura-

tion on the PCB, the board material, and the ambient

temperature. When the IC mounting has good thermal

conductivity, the junction temperature will be low even if the

power dissipation is great. When mounted on the recom-

mended mounting pad, the power dissipation of the SOT23-

5 is increased to 500 mW. For operation at ambient

temperatures over 25 °C, the power dissipation of the

SOT23-5 device should be derated at 4.0 mW/ °C. For

operation above 25 °C: To determine the power dissipation

for shutdown when mounted, attach the device on the actual

PCB and deliberately increase the output current (or raise

the input voltage) until the thermal protection circuit is

activated. Calculate the power dissipation of the device by

subtracting the output power from the input power. These

measurements should allow for the ambient temperature of

the PCB. The value obtained from PD /(150 °C - TA) is the

derating factor. The PCB mounting pad should provide

maximum thermal conductivity in order to maintain low

device temperatures. As a general rule, the lower the

temperature, the better the reliability of the device. The

thermal resistance when mounted is expressed as follows:

Tj = 0jA x PD + TA

For Toko ICs, the internal limit for junction temperature is

150 °C. If the ambient temperature (TA) is 25 °C, then:

150 °C = 0jA x PD + 25 °C

0jA = 125 °C / PD

0jA = 125 °C / PD (°C / mW)

PD is the value when the thermal protection circuit is

activated. A simple way to determine PD is to calculate VIN

x IIN when the output side is shorted. Input current gradually

falls as temperature rises. You should use the value when

thermal equilibrium is reached.

The range of usable currents can also be found from the

graph below.

Procedure:

1) Find PD

2) PD1 is taken to be PD x (~0.8 - 0.9)

3) Plot PD1 against 25 °C

4) Connect PD1 to the point corresponding to the 150 °C with

a straight line.

5) In design, take a vertical line from the maximum

operating temperature (e.g., 75 °C) to the derating curve.

6) Read off the value of PD against the point at which the

vertical line intersects the derating curve. This is taken as

the maximum power dissipation, DPD.

The maximum operating current is:

IOUT = (DPD / (VIN(MAX) - VOUT)

DPD

25 50 75 150

TA (°C)

PD(mW)

October 2001 TOKO, Inc. Page 9

TK717xxS

APPLICATION INFORMATION (CONT.)

NOISE

BYPASS

ON / OFF

VIN VOUT

GND

TK717xx

500

025 50 (85) 150 °C

-4.0 MW / °C

PD(mW)

0100

Mounted as shown

Free Air

SOT23-5 BOARD LAYOUT

BOARD LAYOUT

Page 10 October 2001 TOKO, Inc.

TK717xxS

INPUT-OUTPUT CAPACITORS

Linear regulators require input and output capacitors in order to maintain the regulator’s loop stability. The equivalent series

resistance (ESR) of the output capacitor must be in the stable operation area. However, it is recommended to use as large

a value of capacitance as is practical. The output noise and the ripple noise decrease as the capacitance value increases.

The IC is never damaged by enlarging the capacitance.

ESR values vary widely between ceramic and tantalum capacitors. However, tantalum capacitors are assumed to provide

more ESR damping resistance, which provides greater circuit stability. This implies that a higher level of circuit stability

can be obtained by using tantalum capacitors when compared to ceramic capacitors with similar values. The IC provides

stable operation with an output side capacitor of 0.22 mF (VOUT ³ 2.0 V). If the capacitor is 0.1 mF or more over its full range

of temperature, either a ceramic capacitor or tantalum capacitor can be used without considering ESR (VOUT ³ 2.0 V).

APPLICATION INFORMATION (CONT.)

For output voltage device ³ 2.0 V applications, the recommended value of CL ³ 0.22 mF.

For output voltage device ³ 1.5 V applications, the recommended value of CL ³ 0.47 mF.

For load current £ 0.5 mA, increase the output capacitor to 1 mF.

The input capacitor is necessary when the battery is discharged,

the power supply impedance increases, or the line distance to the

power supply is long. This capacitor might be necessary on each

individual IC even if two or more regulator ICs are used. It is not

possible to determine this indiscriminately. Please confirm the

stability while mounted.

Please increase the output capacitor value when the load current is 0.5 mA or less. The stability of the regulator improves

if a big output side capacitor is used (the stable operation area extends).

For evaluation KYOCERA CM05B104K10AB, CM05B224K10AB, CM105B104K16A, CM105B224K16A,CM21B225K10A

MURATA GRM36B104K10, GRM42B104K10, GRM39B104K25, GRM39B224K10, GRM39B105K6.3

STABLE OPERATION AREA vs. VOLTAGE, CURRENT AND ESR

CL = 0.22 µF

VOUT

CN = 0.01 µF

CIN = 0.22 µF

100

0.1

0 .01 0 50 100 150

IOUT (mA)

All Stable

CL ≥ 1.0 µF

STABLE AREA

CL = 0.1 µF

VOUT = 1.5 V - 1.9 V

ESR (Ω)

100

0.1

0 .01 0 50 100 150

IOUT (mA)

ESR (Ω)

100

0.1

0 .01 0 50 100 150

IOUT (mA)

ESR (Ω)

100

0.1

0 .01 0 50 100 150

IOUT (mA)

ESR (Ω)

100

0.1

0 .01

IOUT (mA)

All Stable

CL ≥ 0.22 µF

ESR (Ω)

STABLE AREA

CL = 0.1 µF

VOUT = 2.0 V

0 50 100 150

VOUT = 3.0 V

STABLE AREA

CL = 0.1 µF

STABLE AREA

CL = 0.1 µF STABLE AREA

CL = 0.1 µF

VOUT = 4.0 V VOUT = 5.0 V

October 2001 TOKO, Inc. Page 11

TK717xxS

Bias Voltage and Temperature Characteristics of Ceramic Capacitors

Generally, a ceramic capacitor has both a temperature characteristic and a voltage characteristic. Please consider

both characteristics when selecting the part. The B curves are the recommended characteristics.

Ta (° C)

-50 - 25 0 2 5 5 0 7 5 1 0 0

100

CAPACITA NCE vs. TE MP ERATURE

F CURVE

B CURVE

CAPACITANCE (%)

Bias Voltage (V)

0 2 4 6 8 1 0

100

CAPACI TANCE vs. BIAS VOLTAGE

F CURVE

B CURVE

CAPACITANCE (%)

APPLICATION INFORMATION (CONT.)

Page 12 October 2001 TOKO, Inc.

TK717xxS

APPLICATION INFORMATION (CONT.)

As shown in the figure below, several components are required to discharge the charge in the output side capacitor in a

typical regulator.

Because the external electrical discharge circuit is unnecessary with the TK717xxS, the application becomes very simple.

Turning the regulator off automatically discharges the charge of the output side capacitor.

The TK112xxB is a normal regulator.

The TK717xx is built with the automatic discharge circuit during off time.

The TK716xxS, AS is built with the output disconnect circuit.

As shown here:

On/Off Control

VIN VOUT

DISCHARGE CIRCUIT

TK717xxS (TOKO REGULATOR)

Doesn’t need discharge circuit

VIN VOUT

DISCHARGE CURRENT IN OFF MODE

On/Off CONTROL

0 200 400 600

on off response: CL = 2.2 µF

CN = 1000 pF I Load = 0mA

VOUT

TK717xx

TK112xxB

TK716xxS, AS

CONTROL

TIME (µS)

October 2001 TOKO, Inc. Page 13

TK717xxS

Marking Information

Product Code K

Part Number Voltage Code

TK71715 15

TK71716 16

TK71717 17

TK71718 18

TK71719 19

TK71720 20

TK71721 21

TK71722 22

TK71723 23

TK71724 24

TK71725 25

TK71726 26

TK71727 27

TK71728 28

TK71729 29

TK71730 30

TK71731 31

TK71732 32

TK71733 33

TK71734 34

TK71735 35

TK71736 36

TK71737 37

TK71738 38

TK71739 39

TK71740 40

TK71741 41

TK71742 42

TK71743 43

TK71744 44

TK71745 45

TK71746 46

TK71747 47

TK71748 48

TK71749 49

TK71750 50

SOT23-5

PACKAGE OUTLINE

Printed in the USA

TOKO AMERICA REGIONAL OFFICES

Toko America, Inc. Headquarters

1250 Feehanville Drive, Mount Prospect, Illinois 60056

Tel: (847) 297-0070 Fax: (847) 699-7864

IC-216-TK716xx

0798O0.0K

Visit our Internet site at http://www.tokoam.com

The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its

products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of

third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.

Western Regional Office

Toko America, Inc.

2480 North First Street , Suite 260

San Jose, CA 95131

Tel: (408) 432-8281

Fax: (408) 943-9790

Midwest Regional Office

Toko America, Inc.

1250 Feehanville Drive

Mount Prospect, IL 60056

Tel: (847) 297-0070

Fax: (847) 699-7864

Semiconductor Technical Support

Toko Design Center

4755 Forge Road

Colorado Springs, CO 80907

Tel: (719) 528-2200

Fax: (719) 528-2375

0.95 0.95

2.9

0.1

1.1

0.95

0.1

0.4 ±0.1

2.8 ±0.3

1.90

2.4

Recommended Mount Pad

1.0

0.7

0-0.1

1.4max

123

Dimensions are shown in millimeters

Tolerance: x.x = ± 0.2 mm (unless otherwise specified)

1.6

0~15°

0.15

±0.1

Kx x

Marking

Product

Code

Voltage

Code