Datasheet TK11148MIL, TK11148MCL, TK11147MIL, TK11147MCL, TK11150MIL Datasheet (TOKO)

March 1999 TOKO, Inc. Page 1

TK111xxM

FEATURES

■ High Voltage Precision at ± 2.0% or ± 60 mV

■ Active High On/Off Control

■ Very Low Dropout Voltage (85 mV at 30 mA)

■ Very Low Noise

■ Miniature Package (SOT-23L-6)

■ Internal Thermal Shutdown

■ Short Circuit Protection

■ Excellent Ripple Rejection (70 dB @ 1 kHz)

■ Reverse Bias Protection

APPLICATIONS

■ Battery Powered Systems

■ Cellular Telephones

■ Pagers

■ Personal Communications Equipment

■ Portable Instrumentation

■ Portable Consumer Equipment

■ Radio Control Systems

■ Toys

BLOCK DIAGRAM

TK111xxM

DESCRIPTION

The TK111xxM is a low dropout linear regulator with a builtin 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. An external capacitor can be connected to the noise bypass pin to lower the output noise level to 30 µVrms.

An internal PNP pass transistor is used to achieve a low dropout voltage of 85 mV (typ.) at 30 mA load current. The TK111xxM has a very low quiescent current of 140 µA (typ.) at no load . The standby current is 100 nA maximum. The internal thermal shutdown 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.

The TK111xxM is available in a miniature SOT-23L-6 surface mount package.

TK111 M L

ORDERING INFORMATION

TAPE/REEL CODE

L: Tape Left

Tape/Reel Code

Voltage Code

VOLTAGE CODE

20 = 2.0 V 36 = 3.6 V 21 = 2.1 V 37 = 3.7 V 22 = 2.2 V 38 = 3.8 V 23 = 2.3 V 39 = 3.9 V 24 = 2.4 V 40 = 4.0 V 25 = 2.5 V 41 = 4.1 V 27 = 2.7 V 42 = 4.2 V 28 = 2.8 V 43 = 4.3 V 29 = 2.9 V 44 = 4.4 V 30 = 3.0 V 45 = 4.5 V 31 = 3.1 V 46 = 4.6 V 32 = 3.2 V 47 = 4.7 V 33 = 3.3 V 48 = 4.8 V 34 = 3.4 V 49 = 4.9 V 35 = 3.5 V 50 = 5.0 V

Product Code

PACKAGE CODE

M: SOT-23L-6

Temp Code

TEMP. CODE:

C: -30 to +80 °C I: -40 to +85 °C

NOTE 1:

2.0 V to 2.3 V available in C temperature code (-30 to +80 °C) only.

20P

GND

CONTROL

V

OUT

V

IN

NOISE BYPASS

GND

NOISE

BYPASS

V

IN

V

OUT

THERMAL

PROTECTION

BANDGAP

REFERENCE

CONTROL

GND

VOLTAGE REGULATOR WITH ON/OFF SWITCH

Page 2 March 1999 TOKO, Inc.

TK111xxM

ABSOLUTE MAXIMUM RATINGS TK111xxMCL (V

OUT

≥ 2.0 V)

Supply Voltage ......................................................... 16 V

Noise Bypass Terminal Voltage ................................. 5 V

Power Dissipation (Note 1) ................................ 600 mW

Reverse Bias............................................................ 10 V

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

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

Operating Voltage Range............................... 1.8 to 12 V

Junction Temperature ........................................... 150 °C

Lead Soldering Temperature (10 s) ...................... 235 °C

TK111xxMCL ELECTRICAL CHARACTERISTICS

Test conditions: VIN = V

OUT(TYP)

+ 1 V, TA = 25 °C, unless otherwise specified.

Note 1: Power dissipation is 600 mW when mounted as recommended. Derate at 4.8 mW/°C for operation above 25 °C. Note 2: Refer to “Definition of Terms.” Note 3: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. Note 4: Output noise voltage can be reduced by connecting a capacitor to the noise bypass terminal. Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C. Gen. Note: Exceeding the “Absolute Maximum Ratings” can damage the device.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

I

Q

tnerruCtnecseiuQI

TUO

IgnidulcxE,Am0=

TNOC

041002Aµ

I

YBTS

tnerruCybdnatSV

NI

FFOtuptuO,V6=1.0Aµ

V

TUO

egatloVtuptuOI

TUO

V,Am01=

NI

V=

)PYT(TUO

V1+1elbaTeeSV

geReniLnoitalugeReniL

V

NI

V=

)PYT(TUO

otV1+

V

)PYT(TUO

)2etoN(,V6+

8.081Vm

geRdaoLnoitalugeRdaoL

I

TUO

)2etoN(,Am06ot1=803Vm

I

TUO

)2etoN(,Am001ot1=4155Vm

V

PORD

egatloVtuoporDI

TUO

)2etoN(,Am06=021002Vm

I

TUO

tnerruCtuptuOsuounitnoC)2etoN(001Am

I

)ESLUP(TUO

tnerruCtuptuOesluP

,elcycytud%5.21,eslupsm5

)2etoN(

031Am

RRnoitcejeRelppiR

C,zHk1=f

L

,Fµ7.4=

C

N

V,Fµ1.0=

NI

V=

)PYT(TUO

,V2+

V

R

I,smrVm002=

TUO

,Am01=

)4,3setoN(

07Bd

V

ON

egatloVesioNtuptuO

zH004 ≤ f ≤ C,zHk08

L

,Fµ7.4=

C

N

V,Fµ10.0=

NI

V=

)PYT(TUO

,V2+

I

TUO

)4,3setoN(,Am01=

03smrVµ

V

fer

lanimreTssapyBesioN

egatloV

52.1V

∆V

TUO

/∆T

tneiciffeoCerutarepmeTI

TUO

Am01=52C°/mpp

SNOITACIFICEPSLANIMRETLORTNOC

I

TNOC

tnerruClortnoCV

TNOC

NOtuptuO,V8.1=2.14Aµ

V

)NO(TNOC

NOegatloVlortnoCNOtuptuO5.1V

V

)FFO(TNOC

FFOegatloVlortnoCFFOtuptuO53.0V

March 1999 TOKO, Inc. Page 3

TK111xxM

ABSOLUTE MAXIMUM RATINGS TK111xxMIL (V

OUT

≥ 2.4 V)

Supply Voltage ......................................................... 15 V

Control Terminal Voltage ......................................... 12 V

Noise Bypass Terminal Voltage ................................. 5 V

Power Dissipation (Note 1) ................................ 600 mW

Reverse Bias............................................................ 10 V

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

Operating Temperature Range ...................-40 to +85 °C

Operating Voltage Range............................... 2.0 to 12 V

Junction Temperature ........................................... 150 °C

Lead Soldering Temperature (10 s) ...................... 235 °C

TK111xxMIL ELECTRICAL CHARACTERISTICS

Test conditions: VIN = V

OUT(TYP)

+ 1 V, TA = -40 to +85 °C, unless otherwise specified.

Note 1: Power dissipation is 600 mW when mounted as recommended. Derate at 4.8 mW/°C for operation above 25 °C. Note 2: Refer to “Definition of Terms.” Note 3: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. Note 4: Output noise voltage can be reduced by connecting a capacitor to the noise bypass terminal. Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C. Gen. Note: Exceeding the “Absolute Maximum Ratings” can damage the device.

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

I

Q

tnerruCtnecseiuQI

TUO

IgnidulcxE,Am0=

TNOC

041002Aµ

I

YBTS

tnerruCybdnatSV

NI

FFOtuptuO,V6=2.0Aµ

V

TUO

egatloVtuptuOI

TUO

V,Am01=

NI

V=

)PYT(TUO

V1+2elbaTeeSV

geReniLnoitalugeReniL

V

NI

V=

)PYT(TUO

otV1+

V

)PYT(TUO

)2etoN(,V6+

8.081Vm

geRdaoLnoitalugeRdaoL

I

TUO

)2etoN(,Am06ot1=803Vm

I

TUO

)2etoN(,Am001ot1=4155Vm

V

PORD

egatloVtuoporDI

TUO

)2etoN(,Am06=021002Vm

I

TUO

tnerruCtuptuOsuounitnoC)2etoN(001Am

I

)ESLUP(TUO

tnerruCtuptuOesluP

,elcycytud%5.21,eslupsm5

)2etoN(

031Am

RRnoitcejeRelppiR

C,zHk1=f

L

,Fµ7.4=

C

N

V,Fµ1.0=

NI

V=

)PYT(TUO

,V2+

V

R

I,smrVm002=

TUO

,Am01=

)4,3setoN(

07Bd

V

ON

egatloVesioNtuptuO

zH004 ≤ f ≤ C,zHk08

L

,Fµ7.4=

C

N

V,Fµ10.0=

NI

V=

)PYT(TUO

,V2+

I

TUO

)4,3setoN(,Am01=

03smrVµ

V

fer

lanimreTssapyBesioN

egatloV

52.1V

∆V

TUO

/∆T

tneiciffeoCerutarepmeTI

TUO

Am01=52C°/mpp

SNOITACIFICEPSLANIMRETLORTNOC

I

TNOC

tnerruClortnoCV

TNOC

NOtuptuO,V8.1=2.16Aµ

V

)NO(TNOC

NOegatloVlortnoCNOtuptuO5.1V

V

)FFO(TNOC

FFOegatloVlortnoCFFOtuptuO53.0V

Page 4 March 1999 TOKO, Inc.

TK111xxM

TK111xxMCL ELECTRICAL CHARACTERISTICS TABLE 1

Output Voltage V

OUT(MIN)

V

OUT(MAX)

Test

Voltage Code Voltage

2.0 V 20 1.940 V 2.060 V 3.0 V

2.1 V 21 2.040 V 2.160 V 3.1 V

2.2 V 22 2.140 V 2.260 V 3.2 V

2.3 V 23 2.240 V 2.360 V 3.3 V

2.4 V 24 2.340 V 2.460 V 3.4 V

2.5 V 25 2.440 V 2.560 V 3.5 V

2.7 V 27 2.640 V 2.760 V 3.7 V

2.8 V 28 2.740 V 2.860 V 3.8 V

2.9 V 29 2.840 V 2.960 V 3.9 V

3.0 V 30 2.940 V 3.060 V 4.0 V

3.1 V 31 3.038 V 3.162 V 4.1 V

3.2 V 32 3.136 V 3.264 V 4.2 V

3.3 V 33 3.234 V 3.366 V 4.3 V

3.4 V 34 3.332 V 3.468 V 4.4 V

3.5 V 35 3.430 V 3.570 V 4.5 V

Output Voltage V

OUT(MIN)

V

OUT(MAX)

Test

Voltage Code Voltage

3.6 V 36 3.528 V 3.672 V 4.6 V

3.7 V 37 3.626 V 3.774 V 4.7 V

3.8 V 38 3.724 V 3.876 V 4.8 V

3.9 V 39 3.822 V 3.978 V 4.9 V

4.0 V 40 3.920 V 4.080 V 5.0 V

4.1 V 41 4.018 V 4.182 V 5.1 V

4.2 V 42 4.116 V 4.284 V 5.2 V

4.3 V 43 4.214 V 4.386 V 5.3 V

4.4 V 44 4.312 V 4.488 V 5.4 V

4.5 V 45 4.410 V 7.590 V 5.5 V

4.6 V 46 4.508 V 4.692 V 5.6 V

4.7 V 47 4.606 V 4.794 V 5.7 V

4.8 V 48 4.704 V 4.896 V 5.8 V

4.9 V 49 4.802 V 4.998 V 5.9 V

5.0 V 50 4.900 V 5.100 V 6.0 V

March 1999 TOKO, Inc. Page 5

TK111xxM

TK111xxMIL ELECTRICAL CHARACTERISTICS TABLE 2

Test Conditions: VIN = V

OUT(TYP)

+ 1 V, I

OUT

= 30 mA, unless otherwise specified.

Room Temp. Range (TA = 25 °C) Full Temp. Range (TA = -40 to +85 °C)

Output Voltage V

OUT(MIN)

V

OUT(MAX)

V

OUT(MIN)

V

OUT(MAX)

Voltage Code

2.4 V 24 2.340 V 2.460 V 2.305 V 2.495 V

2.5 V 25 2.440 V 2.560 V 2.405 V 2.595 V

2.7 V 27 2.640 V 2.760 V 2.605 V 2.795 V

2.8 V 28 2.740 V 2.860 V 2.705 V 2.895 V

2.9 V 29 2.840 V 2.960 V 2.805 V 2.995 V

3.0 V 30 2.940 V 3.060 V 2.905 V 3.095 V

3.1 V 31 3.038 V 3.162 V 3.007 V 3.193 V

3.2 V 32 3.136 V 3.264 V 3.104 V 3.296 V

3.3 V 33 3.234 V 3.366 V 3.201 V 3.400 V

3.4 V 34 3.332 V 3.468 V 3.298 V 3.502 V

3.5 V 35 3.430 V 3.570 V 3.395 V 3.605 V

3.6 V 36 3.528 V 3.672 V 3.492 V 3.708 V

3.7 V 37 3.626 V 3.774 V 3.589 V 3.811 V

3.8 V 38 3.724 V 3.876 V 3.686 V 3.914 V

3.9 V 39 3.822 V 3.988 V 3.783 V 4.017 V

4.0 V 40 3.920 V 4.080 V 3.880 V 4.120 V

4.1 V 41 4.018 V 4.182 V 3.977 V 4.223 V

4.2 V 42 4.116 V 4.284 V 4.074 V 4.326 V

4.3 V 43 4.214 V 4.366 V 4.171 V 4.429 V

4.4 V 44 4.312 V 4.488 V 4.268 V 4.532 V

4.5 V 45 4.410 V 4.590 V 4.365 V 4.635 V

4.6 V 46 4.598 V 4.692 V 4.462 V 4.738 V

4.7 V 47 4.696 V 4.794 V 4.559 V 4.841 V

4.8 V 48 4.794 V 4.896 V 4.656 V 4.944 V

4.9 V 49 4.892 V 4.998 V 4.753 V 5.047 V

5.0 V 50 4.900 V 5.100 V 4.850 V 5.150 V

Page 6 March 1999 TOKO, Inc.

TK111xxM

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25 °C, unless otherwise specified.

TEST CIRCUIT

I

OUT

I

CONT

V

CONT

C

IN

1 µF

I

IN

NOISE BYPASS

V

IN

C

L

2.2 µF

TANTALUM

CN = 0.0047 µF

V

IN

V

OUT

V

OUT

(

5 m

V/

DIV)

LOAD REGULATION

I

OUT

(mA)

0 50 100

V

OUT

TYPICAL

V

OUT

(V)

SHORT CIRCUIT CURRENT

I

OUT

(mA)

0 150 300

5

4

3

2

1

0

V

OUT

(25 mV/ DIV)

OUTPUT VOLTAGE

VS.

INPUT VOLTAGE

VIN (V) (50 mV/ DIV)

0 VIN = V

OUT

I

OUT

= 30 mA

I

OUT

= 60 mA

I

OUT

= 90 mA

I

OUT

= 0 mA

V

OUT

TYPICAL

V

OUT

(

5

0

m

V/

DIV)

LINE REGULATION

VIN (V)

0 10 20

V

OUT

TYPICAL

V

DROP

(mV)

DROPOUT VOLTAGE VS.

OUTPUT CURRENT

I

OUT

(mA)

0 100 200

0

-100

-200

-300

-400

-500

I

GND

(mA)

GROUND CURRENT VS.

OUTPUT CURRENT

I

OUT

(mA)

0 75 150

10

8

6

4

2

0

March 1999 TOKO, Inc. Page 7

TK111xxM

I

REV

(µA)

REVERSE BIAS CURRENT

(VIN = 0 V)

V

REV

(V)

0 10 20

500

400

300

200

100

0

I

STBY

(pA)

STANDBY CURRENT (OFF MODE)

VS. INPUT VOLTAGE

V

IN

(V)

0 10 20

100

50

0

I

Q

(mA)

QUIESCENT CURRENT (ON MODE)

VS. INPUT VOLTAGE

V

IN

(V)

0 5 10

2

1

0

I

OUT

= 0 mA

V

OUT

= 3 V

I

GND

(mA)

GROUND CURRENT

TA (°C)

-50 0 50 100

2

0

1

I

OUT

= 60 mA

I

OUT

= 30 mA

V

DROP

(mV)

DROPOUT VOLTAGE

TA (°C)

-50 0 50 100

200

0

100

I

OUT

= 60 mA

I

OUT

= 30 mA

I

OUT

= 100 mA

I

CONT

(µA)

CONTROL CURRENT

TA (°C)

-50 0 50 100

8

0

6

10

4

2

V

CONT

= 5 V

V

CONT

= 1.8 V

V

CONT

(V)

V

CONT

(V

OUT

, ON POINT)

TA (°C)

-50 0 50 100

2

0

1

R

CONT

= 0 Ω

I

OUT

(mA)

MAXIMUM OUTPUT CURRENT

TA (°C)

-50 0 50 100

260

220

230

250

240

V

OUT

= 2.7 V

OR ABOVE

I

CONT

(µA)

CONTROL CURRENT VS.

CONTROL VOLTAGE

V

CONT

(V)

0 1 2 3 4 5

10

6

0

8

4

2

V

OUT

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

Page 8 March 1999 TOKO, Inc.

TK111xxM

V

OUT

(10

m

V/

DIV)

LINE VOLTAGE STEP RESPONSE

TIME (µs)

0 100 200 300 400

V

IN

CN = 0.001 µF

CN = 0.01 µF

V

OUT

+2 V

V

OUT

+1 V

∆V

OUT

(mV)

OUTPUT VOLTAGE VARIATION

TA (°C)

-50 0 50 100

20

-20

-10

10

0

-30

2.8 V

3.0 V

RR (dB)

RIPPLE REJECTION

f (kHz)

0.01 1 10 100

0

-20

-40

-60

-80

-100

CL = 4.7 µF, CN = 1.0 µF

CL = 2.2 µF, CN = .01 µF

CL = 4.7 µF, CN = 0.1 µF

I

OUT

= 30 mA

NOISE (µV)

OUTPUT NOISE LEVEL

VS.

C

N

C

N

1 pF 10 100 1000 0.1 µF .1

250

200

150

100

50

0

CL = 2.2 µF

I

OUT

= 60 mA

CL = 10 µF

CL = 3.3µF

dB

NOISE SPECTRUM

f (Hz)

0 500 k 1 M

0

-50

-100

CL = 3.3 µF, CN = NONE

CL = 3.3 µF, CN = 0.1 µF

SPECTRUM ANALYZER BACK-

GROUND NOISE

V

OUT

(

5

0

m

V/

DIV)

LOAD CURRENT STEP RESPONSE 1

TIME (µs)

0 200 400 600 800

I

OUT

5 TO 100 mA

CL = 2.2 µF CN = 0.01 µF

1 TO 100 mA

100 mA

1 OR 5 mA

V

OUT

(10

m

V/

DIV)

LOAD CURRENT STEP RESPONSE 2

TIME (ms)

0 2 4 6 8

I

OUT

CN = 0.01 µF50 mA

0 mA

CL = 2.2 µF

CL = 4.7 µF

CL = 10 µF

CL = 47 µF

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

March 1999 TOKO, Inc. Page 9

TK111xxM

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

OUTPUT VOLTAGE (V

OUT

)

The output voltage is specified with VIN = (V

OUT(TYP)

+ 1 V)

and I

OUT

= 10 mA.

DROPOUT VOLTAGE (V

DROP

)

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 temperature.

OUTPUT CURRENT (I

OUT(MAX)

)

The rated output current is specified under the condition where the output voltage drops 0.3 V below the value specified with I

OUT

= 10 mA. The input voltage is set to

V

OUT

+1 V, and the current is pulsed to minimize temperature

effect.

CONTINUOUS OUTPUT CURRENT (I

OUT

)

Normal operating output current. This is limited by the package power dissipation.

PULSE OUTPUT CURRENT (I

OUT (PULSE)

)

Max pulse width 5 ms, Duty cycle 12.5%: pulse load only.

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 = V

OUT(TYP)

+ 1 V to VIN = V

OUT(TYP)

+ 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 = V

OUT(TYP)

+1 V. The load regulation is specified under two output current step conditions of 1 mA to 60 mA and 1 mA to 100 mA.

QUIESCENT CURRENT (IQ)

The quiescent current is the current which flows through

the ground terminal under no load conditions (I

OUT

= 0 mA).

GROUND CURRENT

Ground current is the current which flows through the ground pin(s). It is defined as IIN - I

OUT

, excluding control

current.

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, 1 kHz superimposed on the input voltage, where VIN = V

OUT

+ 2 V. The output decoupling capacitor is set to 4.7 µF, the noise bypass capacitor is set to 0.01 µF, 0.1 µF, 1.0 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.

Example: 64 dB at CN = 0.01 µF, 70 dB at CN = 0.1 µF, 74 dB at CN = 1.0 µF

SENSOR CIRCUITS

Overcurrent 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

Page 10 March 1999 TOKO, Inc.

TK111xxM

ON/OFF RESPONSE WITH CONTROL

The turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. The turn-on time will increase with the value of either capacitor. The graphs below show the relationship between turn-on time and load capacitance. If the value of these capacitors is reduced, the load and line regulation will suffer and the noise voltage will increase. If the value of these capacitors is increased, the turn on time will increase.

external voltage higher than the input voltage is applied to the output side.

REDUCTION OF OUTPUT NOISE

Although the architecture of the Toko regulators is designed to minimize semiconductor noise, further reduction can be achieved by the selection of external components. The obvious solution is to increase the size of the output capacitor. A more effective solution would be to add a capacitor to the noise bypass terminal. The value of this capacitor should be 0.1 µF or higher (higher values provide greater noise reduction). Although stable operation is possible without the noise bypass capacitor, this terminal has a high impedance and care should be taken to avoid a large circuit area on the printed circuit board when the capacitor is not used. Please note that several parameters are affected by the value of the capacitors and bench testing is recommended when deviating from standard values.

CONTROL FUNCTION

The TK111xxM has an active high control pin. The control pin requires over 1.8 V for operation and under

0.6 V for

standby. For the range of 0.6 V < V

CONT

< 1.8 V

, operation is undefined. If the control function is not used, connect the control pin to VIN.

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

SW

C

N

V

IN

OUTPUT VOLTAGE RESPONSE A

(OFF→ON)

-5 5 2515 35

CL = 0.47µF

45

CL = 0.68 µF

CL = 1.5 µF

CL = 1.0 µF

TIME (µs)

I

LOAD

= 30 mA, CN = 3300 pF

V

OUT

V

CONT

OUTPUT VOLTAGE RESPONSE B

(OFF→ON)

02 648

CN = 0.47 µF

CN = 0.33 µF

CN = 0.68µF

CN = 1.0 µF

TIME (ms)

I

LOAD

= 30 mA, CL = 2.2 µF

V

OUT

V

CONT

CN = 0.1 µF

CONTROL FUNCTION

March 1999 TOKO, Inc. Page 11

TK111xxM

The range of usable currents can also be found from the graph below.

Procedure:

1) Find P

D

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

3) Plot PD1 against 25 °C

4) Connect P

D1

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.

SOT-23L-6 POWER DISSIPATION CURVE

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 (V

OUT

x I

OUT

) increases. The rate of temperature rise is greatly affected by the mounting pad configuration 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 recommended mounting pad, the power dissipation of the SOT-23L-6 is increased to 600 mW. For operation at ambient temperatures over 25 °C, the power dissipation of the SOT-23L-6 device should be derated at 4.8 mW/°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 + T

A

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/ P

D

PD is the value when the thermal sensor 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.

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

0 50 100 150

TA (°C)

P

D

(mW)

0

0.6

1.0

0.2

0.4

0.8

MOUNTED AS

SHOWN

FREE AIR

P

D

PD

25 50 75 150

(mW)

TA (

C)

3

6

5

4

Page 12 March 1999 TOKO, Inc.

TK111xxM

1000

100

10

1

0.1

0 .01

1 50 100

130

I

OUT

(mA)

ESR (Ω)

STABLE

OPERATION

AREA

1000

100

10

1

0.1

0 .01

1 50 100

130

I

OUT

(mA)

ESR (Ω)

STABLE

OPERATION

AREA

1000

100

10

1

0.1

0 .01

1 50 100

130

I

OUT

(mA)

ESR (Ω)

STABLE

OPERATION

AREA

1000

100

10

1

0.1

0 .01

1 50 100

130

I

OUT

(mA)

ESR (Ω)

STABLE

OPERATION

AREA

APPLICATION INFORMATION

In general, the capacitor should be at least 1 µF (aluminum electrolytic) and be rated for the actual ambient operating temperature range. The table below shows typical characteristics for several types and values of capacitance. Please note that the ESR varies widely depending upon manufacturer, type, size, and material.

CL = 1 µFC

L

= 2.2 µF

CL = 3.3 µF

CL = 10 µF

Note: ESR is measured at 10 kHz.

INPUT-OUTPUT CAPACITORS

Linear regulators require an output capacitor in order to maintain regulator loop stability. This capacitor should be selected to ensure stable operation over the desired temperature and load range. The graphs below show the effects of capacitance value and Equivalent Series Resistance (ESR) on the stable operation area.

111xx

C

L

ESR

Capacitance

Aluminum

Capacitor

Tantalum

Capacitor

Ceramic

Capacitor

1.0 µF 2.4 Ω 2.3 Ω 0.140 Ω

2.2 µF 2.0 Ω 1.9 Ω 0.059 Ω

3.3 µF 4.6 Ω 1.0 Ω 0.049 Ω 10 µF 1.4 Ω 0.5 Ω 0.025 Ω

March 1999 TOKO, Inc. Page 13

TK111xxM

BOARD LAYOUT

Copper pattern should be as large as possible. Power dissipation is 600 mW for the SOT-23L-6. A low ESR capacitor is recommended. For low temperature operation, select a capacitor with a low ESR at the lowest operating temperature to prevent oscillation, degradation of ripple rejection and increase in noise. The minimum recommended capacitance is

1.0 µF.

SOT-23L-6 BOARD LAYOUT

++

CONTROL

V

IN

V

OUT

GND

NOISE BYPASS

APPLICATION INFORMATION (CONT.)

Page 14 March 1999 TOKO, Inc.

TK111xxM

NOTES

March 1999 TOKO, Inc. Page 15

TK111xxM

NOTES

Page 16 March 1999 TOKO, Inc.

TK111xxM

Marking Information

Product Code TK111xxM W

Voltage Code TK11120M 20 TK11121M 21 TK11122M 22 TK11123M 23 TK11124M 24 TK11125M 25 TK11127M 27 TK11128M 28 TK11129M 29 TK11130M 30 TK11131M 31 TK11132M 32 TK11133M 33 TK11134M 34 TK11135M 35 TK11136M 36 TK11137M 37 TK11138M 38 TK11139M 39 TK11140M 40 TK11141M 41 TK11142M 42 TK11143M 43 TK11144M 44 TK11145M 45 TK11146M 46 TK11147M 47 TK11148M 48 TK11149M 49 TK11150M 50

0.95 0.95

0.32

e e

M

0.1

(3.4)

1.2

0.15

0.3

3.3

2.2

0.4

0.95 0.95

3.0

ee

e1

0.6

1.0

Recommended Mount Pad

123

456

0 - 0.1

0.4 M

0.1

15 max

1.4 max

Marking

+0.15

- 0.05

+0.15

- 0.05

+ 0.3

Dimensions are shown in millimeters Tolerance: x.x = ± 0.2 mm (unless otherwise specified)

Voltage Code

Product Code

5 PL

3.5

+0.3

- 0.1

+0.15

- 0.05

SOT-23L-6

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-xxx-TK111M

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

Eastern Regional Office Toko America, Inc. 107 Mill Plain Road Danbury, CT 06811 Tel: (203) 748-6871 Fax: (203) 797-1223

Semiconductor Technical Support Toko Design Center 4755 Forge Road Colorado Springs, CO 80907 Tel: (719) 528-2200 Fax: (719) 528-2375