Datasheet TK70403MTB Datasheet (TOKO)

TK70403

20P

1.03 V REGULATOR WITH ON/OFF SWITCH

FEATURES

■ Low Input Voltage Operation (Single Battery Cell)

■ Internal PNP Transistor

■ Internal Shutdown Control (Off Current, 0.1 µA max)

■ Low Dropout Voltage [30 mV (typ.) at 2 mA]

■ Miniature Package (SOT-26)

■ Very Low Noise

DESCRIPTION

TK70403 is a low dropout, linear regulator with a built-in electronic switch. A pin for a bypass capacitor is provided, which connects to the internal circuitry to lower the overall output noise level.

An internal PNP pass-transistor is used in order to achieve low dropout voltage (typically 30 mV at 2 mA load current). This makes it possible to maintain a stable output voltage as the battery voltage decreases, extending the useful battery life.

APPLICATIONS

■ Pagers

■ Personal Communication Equipment

■ Portable Consumer Equipment

■ Radio Control Systems

■ Single Battery Cell Systems

TK70403

V

OUT

GND

V

IN

NOISE BYPASS

GND

CONTROL

The TK70403 is available in a miniature SOT-26 surface mount package.

ORDERING INFORMATION

TK70403MTB

Tape/Reel Code

TAPE/REEL CODE

TB: Tape Left

V

CONTROL

BLOCK DIAGRAM

IN

BANDGAP

REFERENCE

NOISE

BYPASS

V

GND

OUT

January 1999 TOKO, Inc. Page 1

TK70403

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ........................................................... 6 V

Power Dissipation (Note 1) ................................ 350 mW

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

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

TK70403 ELECTRICAL CHARACTERISTICS

Test Conditions: VIN = 1.4 V, TA = 25 °C, R

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 820 KΩ, unless otherwise specified.

CONT

Operating Temperature Range ...................-10 to +60 °C

Operating Voltage Range.............................. 0.9 to 5.0 V

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

I

YBTS

V

TUO

V

PORD

I

TUO

I

Q

geReniLnoitalugeReniLV

geRdaoLnoitalugeRdaoLI

/∆T

∆V

TUO

V

fer

I

TNOC

V V

Note 1: Power dissipation is 350 mW when mounted as recommended. Derate at 2.8 mW/°C for operation above 25 °C. Note 2: I Gen Note: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. Example: Ripple rejection is 48

Gen Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.

)NO(TNOC

)FFO(TNOC

when V

OUT

dB at CL = 1 µF, CN = 0.1 µF, I

drops 0.4 V from V

OUT

tnerruCybdnatSV

egatloVtuptuOI

egatloVtuoporDI

NI

TUO

Am2=89.030.1560.1V Am2=60.0V

tnerruCtuptuO)2etoN(0105Am

tnerruCtnecseiuQI

tneiciffeoCerutarepmeTI

TUO

NI

TUO

Am2=52.0C°/Vm

egatloVecnerefeR4.0V

R:SNOITACIFICEPSLANIMRETLORTNOC

TNOC

tnerruClanimreTlortnoCV

K028= ΩΩΩΩΩ

TNOC

)NO(egatloVlortnoCNOtuptuO58.0V

)FFO(egatloVlortnoCFFOtuptuO03.0V

.

OUT(TYP)

= 2 mA, f = 400 Hz.

OUT

FFOtuptuO,V4.1=1.0Aµ

IgnidulcxE,Am0=

TNOC

051Aµ

V7.1ot34.1=02Vm

Am0.5ot1.0=02Vm

NOtuptuO,V0.1=0.1Aµ

Page 2 January 1999 TOKO, Inc.

TK70403

TEST CIRCUIT

I

IN

V

IN

GND

V

OUT

1 µF

V

IN

1 µF

I

OUT

V

OUT

V

CONT

TYPICAL PERFORMANCE CHARACTERISTICS

OUTPUT VOLTAGE VS.

OUTPUT CURRENT

1.05

1.04

(V)

1.03

OUT

V

1.02

1.01

0 5 10

I

(mA)

OUT

I

CONT

R

CONT

820 kΩ

GND

NOISE

BYPASS

C

N

0.1 µF

TA = 25 °C, unless otherwise specified.

OUTPUT VOLTAGE

OUTPUT CURRENT

1.5

1.2

(V)

0.9

OUT

V

0.6

VIN = 1.1 V

0.3

0

0 50 100

I

(mA)

OUT

VS.

1.4 V

1.6 V

1.2 V

OUTPUT VOLTAGE

INPUT VOLTAGE

1.08

I

= 0 mA

OUT

1.04

2.5 mA

(V)

1.00

OUT

V

0.96

0.92

5.0 mA

7.5 mA

0.8 1.0 1.2 1.4 1.6 1.8 VIN (V)

VS.

GROUND CURRENT VS.

OUTPUT CURRENT

2.5

2.0

1.5

(mA)

GND

I

1.0

0.5

0

0 10 20 30 40 50

I

(mA)

OUT

DROPOUT VOLTAGE

OUTPUT CURRENT

100

80

(mV)

60

DROP

40

V

20

0

0 2 4 6 8 10

I

(mA)

OUT

VS.

DROPOUT VOLTAGE VS.

OUTPUT CURRENT

200

(mV)

100

DROP

V

0

0 10 20 30 40 50

I

(mA)

OUT

January 1999 TOKO, Inc. Page 3

TK70403

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

INPUT CURRENT

VS.

VOLTAGE (CONTROL ON)

500

I

OUT

400

300

(µA)

IN

I

200

TA = 60 °C

100

0

0 1 2

VIN (V)

INPUT

= 0 mA

TA = 25 °C

INPUT CURRENT VOLTAGE (CONTROL OFF)

200

(pA)

100

IN

I

0

0 1 2

VIN (V)

VS.

INPUT

LINE VOLTAGE STEP RESPONSE

1.5 V

IN

V

1.4 V CN = 0 µF

(10 mV/ DIV)

OUT

V

CN = 0.1 µF

TIME (50 µS/DIV)

V

IN

V

TK70403

CONT

V

OUT

C

0.1

L

1

N

F

RIPPLE REJECTION CIRUIT

OUTPUT CURRENT

TEMPERATURE

60

VS.

2.0

CONTROL CURRENT

TEMPERATURE

VS.

DROPOUT VOLTAGE

TEMPERATURE

VS.

40

I

= 2 mA

OUT

0

-20 0 20 40 60 80 TA (°C)

50

(mA)

OUT

I

40

30

-20 0 20 40 60 80 TA (°C)

I

1.5

(µA)

1.0

CONT

I

OUT

= 2 mA

0.5

0

-20 0 20 40 60 80 TA (°C)

30

(mV)

20

DROP

V

10

Page 4 January 1999 TOKO, Inc.

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

TK70403

CONTROL VOLTAGE (ON)

1000

800

(mV)

600

400

CONT(ON)

V

200

0

-20 0 20 40 60 80

TEMPERATURE

TA (°C)

VS.

GROUND CURRENT VS.

300

250

200

(µA)

150

GND

I

100

50

0

-20 0 20 40 60 80

TEMPERATURE

I

OUT

I

OUT

TA (°C)

= 10 mA

= 5 mA

January 1999 TOKO, Inc. Page 5

TK70403

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

OUTPUT VOLTAGE (V

The output voltage is specified with VIN = V and I

= 2 mA.

OUT

DROPOUT VOLTAGE (V

OUT

)

DROP

OUT(TYP)

+ 0.4

)

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 value is reduced. It is dependent upon the load current and the temperature.

OUTPUT CURRENT (I

OUT(MAX)

)

The rated output current is specified under the condition where the output voltage drops 0.4 V when the output current is loaded. The input voltage is set to V

OUT

+ 0.4 V.

LINE REGULATION (Line Reg)

Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The voltage is pulsed to minimize temperature effects.

LOAD REGULATION (Load Reg)

ON/OFF CONTROL

High is “on” (referenced to ground). When the on/off function is not used, connect the control terminal to VIN. The control current can be reduced by inserting a series resistor (R

) between the control terminal and VIN.

CONT

Changes in the on/off level, due to this connection, are shown below.

2

V

= 1 M

OUT

V

= 680 k

V

CONT

OUT

R

CONT

(V)

= 820 k

(µA)

1

CONT

I

0

0 1 2

ON/OFF RESPONSE WITH CONTROL (SPEED)

Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. It is pulsed to minimize temperature effects. The load regulation is specified to 0.1 mA to 5.0 mA.

QUIESCENT CURRENT (IQ)

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

GROUND CURRENT (I

GND

)

OUT

= 0 mA).

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

, excluding control

OUT

current.

RIPPLE REJECTION (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 50 mVp-p, 400 Hz, I on the input voltage, where VIN = V

= 2 mA superimposed

OUT

OUT(TYP)

+ 0.4 V. The ripple rejection is the ratio of the output vs. input and is expressed in dB.

The turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. The turn-on time will decrease with smaller value of either capacitor. The graph below shows the relationship between turn-on time and load capacitance. However, when the capacitance is small, load transient and line transient will worsen and the noise will increase. CL = 0.68 µF, CN = 1000 pF will be the best for fastest operation.

.1 µ

.01 µ

N

1000 pF

C

100 pF

10 pF

CL = 0.68 µF

0

0 100 1000

CL = 0.45 µF

CL = 2.2 µF

CL = 4.7 µF

RISE TIME (µs)

Page 6 January 1999 TOKO, Inc.

TK70403

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

CL = 0.47 µF

CL = 2.2 µF

OUT

V

CONT

V

0 50

TIME (µs)

CL = 4.7 µF

CL = 0.68 µF

REDUCTION OF OUTPUT NOISE

Although the architecture of the Toko regulators is designed to minimize semiconductor noise, further reduction can be achieved by increasing the size of the output capacitor. A more effective solution would be to add a capacitor to the noise bypass terminal. The value of the capacitor should be at least 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.

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-26 is increased to 350 mW. For operation at ambient temperatures over 25 °C, the power dissipation of the SOT-26 device should be derated at 2.8 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

INPUT AND OUTPUT CAPACITORS

PD is the value when the thermal sensor is activated. A simple way to determine PD is to calculate VIN x IIN when

Toko regulators require an output capacitor in order to maintain regulator loop stability. The capacitor value should be at least 0.68 µF over actual ambient operating

the output side is shorted. Input current gradually falls as temperature rises. You should use the value when thermal equilibrium is reached.

temperature.

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

OUT

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

January 1999 TOKO, Inc. Page 7

TK70403

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

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

(mW)

P

D

3

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 °C

D1

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

OUT

(mW)

D

P

= (D

450

350

250

150

50

/ (V

PD

IN(MAX) - VOUT

0

0 50 100 150

TA (°C)

)

MOUNTED AS

SHOWN

FREE AIR

SOT-26 POWER DISSIPATION CURVE

Page 8 January 1999 TOKO, Inc.

BOARD LAYOUT

TK70403

APPLICATION INFORMATION

V

IN

CONTROL

GND

SOT-26 BOARD LAYOUT

V

++

OUT

January 1999 TOKO, Inc. Page 9

TK70403

)

PACKAGE OUTLINE

SOT-26 (SOT-23-6)

6

1

5

2

3

(1.9)

0.950.95

e

2.9

e

Marking Information

0.7

4

Marking

0.3

1.0

(0.6)

2.4

1

e

1.6

e

(0.6)

+

0.1

Recommended Mount Pad

M

0.1

1.1

1.4 max

0.95

e

0.95

e

1.90

0.1

+

0.15

Marking TK70403 03J

0.1

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

0 ~ 0.1

+

0.3

2.8

0-13

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

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

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 January 1999 TOKO, Inc.

IC-216-TK70001

0798O0.0K