Datasheet TK11900MTL Datasheet (TOKO)

TK11900

0

1

S

ADJUSTABLE LOW DROPOUT REGULATOR

FEATURES

■■

■ Low Supply Current

■■

■ Low Power Shutdown Mode

■■

■ Low Noise Output

■■

■ Low Dropout Voltage

■■

■ Extremely High Stability

■■

■ High Speed On/Off Transient (50 µs typ.)

■■

■ Miniature Package (SOT-23L)

■■

DESCRIPTION

The TK11900 is a low dropout voltage regulator with external voltage adjustment. The output can be set between 1.5 V and 15 V by an external pair of resistors in a divider configuration. The device has a bypass pin for an external capacitor to reduce output noise to a typical 50 µV(rms). In addition, a control pin is provided that is active low (a low level turns on the output). In the “off” mode (control pin high) the device draws only 65 µA of quiescent current.

APPLICATIONS

■■

■ Portable Instrumentation

■■

■ Cordless Telephones

■■

■ Pagers

■■

■ Toys

■■

■ Cellular Telephones

■■

■ Test Equipment

■■

TK11900

CONTROL

NOISE

BYPASS

V

IN

GND

The TK11900 is available in a miniature SOT-23L surface mount package.

ORDERING INFORMATION

TK11900M

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

V

CONTROL

FEEDBACK

V

OUT

BLOCK DIAGRAM

IN

NOISE

THERMAL

PROTECTION

GND

SHUT

DOWN

BANDGAP

REFERENCE

BYPASS

V

OUT

FEEDBACK

November 2000 TOKO, Inc. Page 1

TK11900

ABSOLUTE MAXIMUM RATINGS

Supply Voltage......................................................... 17 V

Operating Voltage Range ............................... 1.8 to 16 V

Power Dissipation (Note 1) ................................. 400 mW

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

TK11900M ELECTRICAL CHARACTERISTICS

Test conditions: V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

IN

= V

OUT(TYP)

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

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

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

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

V=

V

I

Q

I

YBTS

V

TUO

V

PORD

I

TUO

tnerruCtnecseiuQ

tnerruCybdnatSFFOtuptuO56041Aµ

egatloVtuptuO)2etoN(5.151V

egatloVtuoporDI

tnerruCtuptuO 001Am

NI

V

V=

NI

TUO

geReniLnoitalugeReniLV

geRdaoLnoitalugeRdaoLAm1 ≤ I

∆V

TUO

/∆T

tneiciffeoCerutarepmeTV

RRnoitcejeRelppiRC

V

ON

V

fer

egatloVesioNtuptuO

egatloVecnerefeR

NI

L

C

N

T

A

T

A

V=

zH01 ≤ f ≤ C,zHk001

)PYT(TUO

Am03=061053Vm

V1+ ≤VNI≤V

)PYT(TUO

≤ Am0802001Vm

TUO

)PYT(TUO

Fµ10.0=

C°52=522.1052.1572.1V

I,V1+

TUO

I,V1-

TUO

Am0=041003Aµ

Am0=083009Aµ

V01+505Vm

)PYT(TUO

V1-51.0±C°/Vm

zH004=f,Fµ01=86Bd

L

,Fµ01=

C°08ot03-=012.1052.1092.1V

SNOITACIFICEPSLANIMRETLORTNOC

I

TNOC

V V

T

Note 1: Power dissipation is 400 mW when mounted as recommended. Derate at 3.2 mW/°C for operation above 25°C. Note 2: The output voltage can be set from 1.5 to 15 V by two external resistors. “Refer to Definition of Terms.”

)NO(TNOC

)FFO(TNOC

R

emiTesiRtuptuO

tnerruClanimreTlortnoC

V

)NO(egatloVlortnoCNOtuptuO6.0V

)FFO(egatloVlortnoCFFOtuptuO2.2V

I

TUO

)NOotFFO(

C

N

V

V5=52001Aµ

TNOC

V61=54051Aµ

TNOC

C,Am03=

L

,Fµ1.0=

Fµ1.0=

05smrVµ

05sµ

Page 2 November 2000 TOKO, Inc.

Note: CL is a tantalum capacitor

V

(V)

I

GND

(mA)

10

GROUND CURRENT

VS.

OUTPUT CURRENT

I

OUT

(mA)

0 50 100

0

5

TYPICAL PERFORMANCE CHARACTERISTICS

TEST CIRCUIT

I

IN

V

IN

+

1 µF

NOISE BYPASS

C

I

CONT

V

CONT

V

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

OUT

N

0.01 µF

CONT

R

1

FEEDBACK

R

2

+

V

OUT

C

L

I

10 µF

OUT

Note: V 10 k - R2 - 60 k

= 1.25 [(R1 + R2) / R2]

OUT

Connect Pin 5 to ground

TK11900

VS.

5.1

OUTPUT VOLTAGE

OUTPUT CURRENT

VS.

5.1

OUTPUT VOLTAGE

INPUT VOLTAGE

VS.

500

QUIESCENT CURRENT

INPUT VOLTAGE

5.0

(V)

OUT

V

5.0

(V)

OUT

V

4.9

4.8

250

(mA)

Q

I

4.7

4.9 0 50 100

I

(mA)

OUT

OUTPUT VOLTAGE CHARACTERISTICS

VS.

INPUT VOLTAGE

4.6 0 10 20

VIN (V)

REFERENCE VOLTAGE

VS.

(FEEDBACK PIN)

TEMPERATURE

0

0 10 20

VIN (V)

5.5

1.28

I

= 0 mA

OUT

(V)

5.0

OUT

V

30 mA

60 mA

4.5

4.5 5.0 5.5 VIN (V)

1.27

1.26

ref

1.25

1.24

1.23

-50 0 50 100 TA (°C)

November 2000 TOKO, Inc. Page 3

TK11900

I

IN

(µA)

200

INPUT CURRENT AND CONTROL

CURRENT

VS.

CONTROL VOLTAGE

V

CONT

(V)

0 2.5 5.0

0

100

SHUTDOWN POINT

I

IN

I

CONT

I

CONT

(µA)

100

50

0

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

V

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

OUT

DROPOUT VOLTAGE

OUTPUT CURRENT

500

400

300

(mV)

200

DROP

V

100

0

0 50 100

I

(mA)

OUT

OUTPUT VOLTAGE

OUTPUT CURRENT

5

4

(V)

3

OUT

V

2

1

VS.

300

200

150

100

NOISE (µV)

50

0

1 pF

0

-50

RR (dB)

NOISE

VS.

BYPASS

CAPACITOR VALUE

100 pF

10 pF

RIPPLE REJECTION VS.

1000 pF

C

N

FREQUENCY

CL = 0.1 µF

0.01 µF

CL = 10 µF

0.1 µF

V

0.01

OUT

C

L

F

10

C

N

F

V

IN

SW

11900

F

0.1

RIPPLE REJECTION CIRCUIT

0

0 100 200

I

OUT

VS.

NOISE

-50

I

OUT

CL = 0.1 µF

-100

CN = 0.1 µF

NOISE (dB)

SPECTRUM ANALYZER BACKGROUND NOISE

-150 0 500 k 1 M

Page 4 November 2000 TOKO, Inc.

(mA)

SPECTRUM

= 25 mA

CL = 3.3 µF CN = 0.1 µF

f (Hz)

-100 10 100 1 k 10 k 100 k

f (Hz)

LINE VOLTAGE STEP RESPONSE

7 V

IN

V

6 V

(20 mV / DIV)

OUT

V

TIME (50 µs/DIV)

LOAD CURRENT STEP RESPONSE

OUT

I

50 mA

0 mA

(100 mV / DIV)

OUT

V

OUT

V

TIME (50 µs/DIV)

I

(

A)

I

STBY

(µA)

STANDBY CURRENT (OFF MODE)

VS.

TEMPERATURE

TA (°C)

-50 0 50 100

50

0

100

I

(

A)

V

(V)

V

DROP

(mV)

DROPOUT VOLTAGE

VS.

TEMPERATURE

TA (°C)

-50 0 50 100

0

500

I

OUT

= 30 mA

400

300

200

100

I

OUT

= 60 mA

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

V

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

OUT

TK11900

CONT

V

CL = .1 µF

(1 V / DIV)

OUT

V

OUT

V

50

40

µ

30

CONT

20

TURN-ON TIME

CAPACITOR

2.4 V

1 µF

0 V

TIME (50 µs/DIV)

CONTROL CURRENT

VS.

TEMPERATURE

VS.

4.7 µF

V

CONT

OUTPUT

10 µF

15 µF

= 5 V

GROUND CURRENT (ON MODE)

VS.

TEMPERATURE

10

m

5

GND

0

-50 0 50 100

CONTROL VOLTAGE (OFF POINT)

2.0

1.0

CONT

I

= 60 mA

OUT

I

= 30 mA

OUT

TA (°C)

VS.

TEMPERATURE

10

0

-50 0 50 100

November 2000 TOKO, Inc. Page 5

V

CONT

TA (°C)

= 2.5 V

0

-50 0 50 100 TA (°C)

TK11900

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

QUIESCENT CURRENT (IQ)

The quiescent current is the current which flows through the ground terminal under no load (I

GROUND CURRENT (I

GND

)

= 0 mA).

OUT

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

IN

- I

, excluding control current.

OUT

Line Regulation (Line Reg) Line regulation is the relationship between change in output

voltage due to a change in input voltage. Load Regulation (Load Reg) Load regulation is the relationship between change in output

voltage due to a change in load current.

DROP OUT VOLTAGE (V

DROP

)

This is a measure of how well the regulator performs as the input voltage decreases. The smaller the number, the further the input voltage can decrease before regulation problems occur. Nominal output voltage is first measured when VIN = V

OUT(TYP)

+ 1 at a chosen load current. When the

output voltage has dropped 100 mV from the nominal, V

- V

is the dropout voltage. This voltage is affected by

OUT

load current and junction temperature.

OUTPUT NOISE VOLTAGE

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

) increases. The rate of tempera-

OUT

ture 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 SOT23L is increased to 400 mW. For operation at ambient temperatures over 25 °C, the power dissipation of the SOT23L device should be derated at 3.2 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 P

/(150 °C - TA) is the derating factor. The PCB mounting

D

pad should provide maximum thermal conductivity in order to maintain low device temperatures. As a general rule, the

IN

lower the temperature, the better the reliability of the device. The thermal resistance when mounted is expressed as follows:

This is the effective AC voltage that occurs on the output

Tj = 0jA x PD + T

A

voltage under the condition where the input noise is low and with a given load, filter capacitor, and frequency range.

THERMAL PROTECTION

This is an internal feature which turns the regulator off when the junction temperature rises above 150 °C. After the regulator turns off, the temperature drops and the regulator

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

output turns back on. Under certain conditions, the output waveform may appear to be an oscillation as the output turns off and on and back again in succession.

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.

Page 6 November 2000 TOKO, Inc.

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

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

(mW)

P

D

3

TK11900

D

PD

6

4

5

25 50 75 150

TA (°C)

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

to the point corresponding to the 150

D1

°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:

I

= (D

OUT

500

400

300

(mW)

D

200

P

100

0

0 50 100

PD

/ (V

IN(MAX) - VOUT

MOUNTED

FREE AIR

TA (°C)

)

150

SOT-23L POWER DISSIPATION

November 2000 TOKO, Inc. Page 7

TK11900

APPLICATION INFORMATION

BOARD LAYOUT

Copper pattern should be as large as possible. Power dissipation is 400 mW for the SOT-23L package. A low Equivalent Series Resistance (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 2.2 µF.

V

IN

+

CONTROL

NOISE BYPASS

GND

FEEDBACK

V

OUT

+

SOT-23L BOARD LAYOUT

to consider the characteristics of the capacitor over temperature when selecting decoupling capacitors.

The ESR is another important parameter. The ESR will increase with temperature but low ESR capacitors are often larger and more costly. In general, tantalum capacitors offer lower ESR than aluminum electrolytic, but new low ESR aluminum electrolytic capacitors are now available from several manufacturers. Usually a bench test is sufficient to determine the minimum capacitance required for a particular application. After taking thermal characteristics and tolerance into account, the minimum capacitance value should capacitor or 3.3 µF for an aluminum electrolytic. Please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. The use of high quality decoupling capacitors suited for your application will guarantee proper operation of the circuit.

NOISE BYPASS CAPACITOR SECTION

The noise bypass capacitor (C

) should be connected as

N

close as possible to pin 1 and ground. The recommended value for CN is 0.01 mF. The noise bypass terminal has a high impedance and care should be taken if the noise bypass capacitor is not used. This terminal is susceptible to external noise, and oscillation can occur when CN is not used and the solder pad for this pin is too large.

INPUT/OUTPUT DECOUPLING CAPACITOR CONSID-

OUTPUT VOLTAGE SETTING

ERATIONS

The output voltage can be set from 1.5 to 15 V by two

Voltage regulators require input and output decoupling

external resistors according to the following equation:

capacitors. The required values of these capacitors vary with application. Capacitors made by different manufacturers can have different characteristics, particularly with

V

= 1.25 V x [(R1 + R2) / R2]

OUT

regard to high frequencies and ESR over temperature. The

V

type of capacitor is also important. For example, a 4.7 µF aluminum electrolytic may be required for a certain application. If a tantalum capacitor is used, a lower value of 2.2 µF

OUT

R

1

would be adequate. It is important to consider the temperature characteristics of the decoupling capacitors. While Toko regulators are designed to operate as low as -30 °C, many capacitors will not operate properly at this temperature. The capacitance of aluminum electrolytic capacitors

FEEDBACK

R

2

may decrease to 0 at low temperatures. This may cause oscillation on the output of the regulator since some capacitance is required to guarantee stability. Thus, it is important

where 10 kΩ - R2 - 60 k

Page 8 November 2000 TOKO, Inc.

CURRENT BOOST

APPLICATION INFORMATION (CONT.)

V

IN V

R

E

R

1

FEEDBACK

R

2

NOISE BYPASS

CONTROL

1 µF

C

N

0.1 µF

CONT

OUT

+

C

L

10 µF

Note: V 10 k - R2 - 60 k

= 1.25 [(R1 + R2) / R2]

OUT

TK11900

The output current can be increased by connecting an external NPN transistor as shown above. The output current capability depends on the H

of the external transistor.

fe

Note: The TK11900 internal short circuit protection and the thermal sensor do not protect the external transistor.

November 2000 TOKO, Inc. Page 9

TK11900

PACKAGE OUTLINE

SOT-23L (SOT-23L-6)

456

123

e e

0.95 0.95

+0.3

- 0.1

3.5

(3.4)

0.1

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

0.32

+0.15

- 0.05

Marking

Marking Information

Marking

TK11900 G0

0.6

1.0

3.0 e1

0.1

M

Recommended Mount Pad

0.3

1.2

1.4 max

+0.15

- 0.05

0 - 0.1

0.15

ee

0.95 0.95

2.2

+ 0.3

3.3

15 max

0.4

Toko America, Inc. Headquarters 1250 Feehanville Drive, Mount Prospect, Illinois 60056 Tel: (847) 297-0070 Fax: (847) 699-7864

TOKO AMERICA REGIONAL OFFICES

Midwest Regional Office Toko America, Inc. 1250 Feehanville Drive Mount Prospect, IL 60056 Tel: (847) 297-0070 Fax: (847) 699-7864

Western Regional Office Toko America, Inc. 2480 North First Street , Suite 260 San Jose, CA 95131 Tel: (408) 432-8281 Fax: (408) 943-9790

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

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.

Page 10 November 2000 TOKO, Inc.

IC-118-TK11900

0798O0.0K

Printed in the USA