Datasheet TK73200MCL Datasheet (TOKO)

TK73200

C

PULSE

CONTROL

GND

BASE

NOISE

BYPASS

V

ADJ

I

PK

V

IN

ADJUSTABLE LOW DROPOUT REGULATOR

FEATURES

■ Up to 5 A Output Current Capability with External

PNP Transistor

■ Internal Short Circuit Protection

■ Excellent Load Regulation

■ CMOS/TTL-Compatible On/Off Switch

■ Internal Reverse Bias Current Protection Switch

■ Internal Thermal Shutdown

■ Wide Adjustable Output Voltage Range

(2.0 V to 12.0 V)

■ Continuous and Pulsed Current Modes

DESCRIPTION

The TK73200 is a controller IC for an adjustable low dropout voltage regulator. The TK73200 and the external PNP power transistor provide adjustable output voltages from 2 to 12 V and output current from 100 mA to 5 A. By utilizing an external PNP power transistor, low dropout voltage at high current can be readily achieved. The internal electronic 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 high logic level. A pin for a bypass capacitor, which connects to the internal circuitry, is provided to lower the overall output noise level.

APPLICATIONS

■ Battery Powered Systems

■ Cellular/Cordless Telephones

■ Radio Control Systems

■ Wireless Communications Systems

■ Portable Instrumentations

■ Portable Computers

■ Personal Digital Assistants

■ Local Area Network (LAN) Receivers

■ Power Recovery for Microprocessors

TK73200

The current limit characteristics can be configured as continuous (constant current) or pulsed (cycling). An internal thermal shutdown circuit limits the junction temperatures to below 150 °C.

BLOCK DIAGRAM

I

IN

PK C

PULSE

V

BASE

V

ORDERING INFORMATION

TK73200M L

Tape/Reel Code

Package Code

TAPE/REEL CODE

L: Tape Left

TEMP. RANGE

C: -30 to 80 °C

June 1999 TOKO, Inc. Page 1

Temp. Code

PACKAGE CODE

M: SOT23L-8

CONTROL

ON/OFF

CIRCUIT

BANDGAP

REFERENCE

GND

THERMAL

SENSOR

NOISE BYPASS

ADJ

TK73200

ABSOLUTE MAXIMUM RATINGS (NOTE 5)

Supply Voltage Range ............................................ 19 V

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

Reverse Bias Voltage Range ..................................... 6 V

Noise Bypass Pin Terminal Voltage Range ............... 5 V

Control Pin Terminal Voltage Range........................ 14 V

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

TK73200 ELECTRICAL CHARACTERISTICS

Test conditions: VIN = V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

OUT(TYP)

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

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

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

Operating Voltage Range............................ 1.8 to 14.0 V

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

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

I

Q

I

YBTS

I

TUO

V

PORD

V

TUO

geReniLnoitalugeReniL

I

)L(ESAB

I

)H(ESAB

V

ESNES

RRnoitcejeRelppiR

V

ON

tnerruCtnecseiuQI

tnerruCybdnatSV

TUO

NI

IgnidulcxE,Am0=

TNOC

052063Aµ

FFOtuptuO,V8=1.0Aµ

tnerruCtuptuOtnednepeDrotsisnarTlanretxEA/NA

egatloVtuoporDtnednepeDrotsisnarTlanretxEA/NV

egatloVtuptuOsrotsiseRlanretxEybteS221V

V=

V

NI

V

)PYT(TUO

otV1+

)2etoN(V6+

0.302Vm

geRdaoLnoitalugeRdaoLtnednepeDrotsisnarTlanretxE01Vm

WOLtnerruCesaBV8.1 ≤ VNI≤ V451Am

HGIHtnerruCesaBV1.4 ≤ VNI≤ V2104Am

edoMtimiLtnerruCsuounitnoC08001021Vm

egatloVtceteDtimiLtnerruC

edoMtimiLtnerruCesluP0709011Vm

C,zH004=f

L

C

N

I

TUO

V,Fµ1.0=

NI

V,Am03=

,Fµ01=

V=

)PYT(TUO

ELPPIR

,V5.1= ,smrVm001=

75Bd

)3etoN(

esioNtuptuO

)3etoN(

,zHk03otzH004=FPB,zHk1=f

31.0zH/Vµ

I

∆V V

/∆T

C

ESLUP

egatloVecnerefeR 22.152.182.1V

ESLUP

TUO

fer

tnerruClanimreTniP)4etoN(515254Aµ

tneiciffeoCerutarepmeT 02C°/mpp

SNOITACIFICEPSLANIMRETLORTNOC

I

TNOC

V V

)NO(TNOC

)FFO(TNOC

tnerruClortnoCV

TNOC

)NO(egatloVlortnoCNOtuptuO8.1V

)FFO(egatloVlortnoCFFOtuptuO6.0V

NOtuptuO,V8.1=5.602Aµ

Page 2 June 1999 TOKO, Inc.

TK73200

TK73200 ELECTRICAL CHARACTERISTICS (STANDARD DEVICES) CONT.

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: This pin is used for Pulse Current Limit Mode. When selecting Continuous Current Limit Mode, this pin is connected to GND. Note 5: The voltage applied to any pin must be greater than -0.4 V. Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.

June 1999 TOKO, Inc. Page 3

TK73200

V

(

0

V/

DIV)

V

(10

V/

DIV)

V

(

V/

DIV)

I

(

A)

V

(

V)

I

(

A)

Note:Transistor: 2SB1115

TEST CIRCUIT

CPC

N

R

P

V

IN

CN = 0.1 µF CP = 0.1 µF

C

IN

R

IPK

TK73200

CONT

CIN = 1 µF CL = 4.7 µF RP = 330 k Continuous Current Limit Mode: I

(mA) = 100 mV / R

SET

Pulse Current Limit Mode: I

(mA) = 90 mV / R

SET

IPK

(Ω)

EMITTER

EXTERNAL

TRANSISTOR

COLLECTOR

BASE

R

1

C

L

R

2

V

OUT

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25 °C, external transistor is 2SB1115(NEC), unless otherwise specified.

V

= 1.25 ( 1 + R2 / R1)

OUT

20 kΩ ≤ R1 ≤ 68 kΩ

2.0 V ≤ V

OUT

≤12 V

VOUT

LINE REGULATION 1

m 5

OUT

0 10 20

VIN (V)

QUIESCENT CURRENT

INPUT VOLTAGE

5

4

3

m

Q

V

OUT

V

OUT

= 3.0 V

2

= 5.0 V

VS.

LINE REGULATION 2

m

OUT

0 10 20

VIN (V)

DROPOUT VOLTAGE

OUTPUT CURRENT AND

EXTERNAL TRANSISTORS

0

-100

m

-200

DROP

-300

VS.

2SB799

2SB1115

2SB1114

2SB1302

LOAD REGULATION

V

5 m

OUT

0 500 1000

I

(mA)

OUT

GROUND CURRENT

OUTPUT CURRENT

5

4

m

3

GND

2

TYPICAL

VS.

1

0

0 10 20

VIN (V)

-400

0 500 1000

I

(mA)

OUT

1

0

0 500 1000

I

(mA)

OUT

Page 4 June 1999 TOKO, Inc.

V

(

V)

I

(

A)

I

(A) I

(A)

I

(

A)

V

OUT

(mV)

50

OUTPUT VOLTAGE VARIATION

VS.

TEMPERATURE

TA (°C)

-50 0 50 100

-10

30

10

-30

-50

V

OUT

TYPICAL

73200

C

L

4.7 µF

V

OUT

V

IN

R

CONT

V

CONT

C

N

RIPPLE REJECTION CIRCUIT

V

(V)

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, external transistor is 2SB1115(NEC), unless otherwise specified.

TK73200

CURRENT LIMIT DETECTOR VOLTAGE

VS. INPUT VOLTAGE

CONTINUOUS CURRENT

LIMIT MODE

100

m

∆

PULSE CURRENT

LIMIT MODE

50

0 5 10 15

VIN (V)

QUIESCENT CURRENT

INPUT VOLTAGE (OFF MODE)

1E-6

Q

1E-9

VS.

BASE CURRENT DRIVE

INPUT VOLTAGE

100

m

B

50

0 5 10 15

VIN (V)

RIPPLE REJECTION

0

-20

-40

RR (dB)

-60

CN = 0.01 µF

CN = NONE

CN = 0.1 µF

-80

VS.

REVERSE BIAS CURRENT

(VIN = 0 TO 6 V)

1E-6

REV

1E-9

VIN = 0 V

VIN = 6 V

VIN = 4 V

VIN = 2 V

1E-12

0 5 10

V

(V)

REV

1E-12

0 10 20

VIN (V)

CONTROL CURRENT

TEMPERATURE

50

40

µ

30

CONT

20

V

= 2 V

10

CONT

0

-50 0 50 100 TA (°C)

June 1999 TOKO, Inc. Page 5

-100

0.01 0.1 1 10 100 f (kHz)

VS.

CONTROL VOLTAGE (OUTPUT ON

POINT) VS. TEMPERATURE

V

CONT

= 5 V

2.0

1.0

CONT

R

CONT

= 0 Ω

-50 0 50 100 TA (°C)

TK73200

V

(V)

V

OUT

ON/OFF STEP RESPONSE

TIME (µs)

0 10 20 30

CL = 4.7 µF

CN = NONE

I

OUT

= 30 mA

ON/OFF CONTROL

V

(200

V/

DIV)

V

(20

V/

DIV)

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, external transistor is 2SB1115(NEC), unless otherwise specified.

CONTROL PIN VOLTAGE

CONTROL CURRENT

50

40

30

CONT

20

10

0

-50 0 50 100 I

CONT

LOAD CURRENT STEP RESPONSE

I

= 0 TO 300 mA

OUT

m

OUT

CL = 47 OR 100 µF

CL = 10 µF

CL = 4.7 µF

R

CONT

(µA)

CL = 22 µF

V

OUT

CONT

= 100 k

R

CONT

VS

.

= 0 k

= 200 k

ON/OFF TRANSIENT

5000

CL = 100 µF

1000

RISE TIME (µs)

m

OUT

CL = 4.7 µF

CL = 22 µF

100

10

0.001 0.01 0.1 10

LINE VOLTAGE STEP RESPONSE

V

OUT

IN

V

OUT

I

OUT

C

N

= 50 mA

CL = 4.7 µF OR 10 µF

CN (µF)

+ 2 V

= NONE

= 0.1 µF

C

N

V

OUT

+ 1 V

0 5 10 15 20

Page 6 June 1999 TOKO, Inc.

TIME (µs)

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

TK73200

OUTPUT VOLTAGE (V

The output voltage is specified with VIN = (V and I

= 30 mA.

OUT

DROPOUT VOLTAGE (V

OUT

)

DROP

OUT(TYP)

+ 1 V)

)

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, the external transistor and the junction temperature.

BASE CONTROL CURRENT (I

BASE

)

The base control current is the drive current for the base of the external transistor.

OUTPUT CURRENT (I

OUT

)

The output current depends on the characteristics of the external transistor and current limit setting.

LINE REGULATION (Line Reg)

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 100 mVrms, 400 Hz superimposed on the input voltage, where VIN = V

OUT(TYP)

+ 1.5 V. The output decoupling capacitor is set to 10 µF, the noise bypass capacitor is set to 0.1 µF, and the load current is set to 30 mA. Ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in dB.

STANDBY CURRENT (I

STBY

)

Standby current is the current which flows into the regulator when the output is turned off by the control function (V

= 0 V). It is measured with VIN = 8 V.

CONT

SENSOR CIRCUITS

Overcurrent Sensor

The overcurrent sensor protects the device if the output is shorted to ground.

Thermal Sensor

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. Load regulation depends on the external transistor.

QUIESCENT CURRENT (IQ)

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

OUT

= 0 mA)

and excludes the control pin current.

GROUND CURRENT (I

GND

)

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

IN

- I

, excluding control

OUT

current.

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.

June 1999 TOKO, Inc. Page 7

TK73200

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 (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 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-8 is increased to 600 mW. For operation at ambient temperatures over 25 °C, the power dissipation of the SOT23L-8 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:

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

(mW)

P

D

PD

3

6

4

5

25 50 75 150

TA (°C)

Procedure:

1) Find P

D

2) PD1 is taken to be PD x (Note: It is not necessary to connect

a ceramic capacitor in parallel with an aluminum or tantalum output capacitor. (~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

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

OUT

750

600

450

(mW)

D

300

P

150

= (D

PD

/ (V

IN(MAX) - VOUT

MOUNTED AS

SHOWN

FREE AIR

)

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

0

0 50 100 150

TA (°C)

equilibrium is reached.

SOT23L-8 POWER DISSIPATION CURVE

Page 8 June 1999 TOKO, Inc.

APPLICATION INFORMATION

TK73200

INPUT-OUTPUT CAPACITORS

The output capacitor is necessary for stable operation. The regulator may oscillate if the output capacitor is too small or missing. The output capacitor size is determined by load, transient response and external transistor used. Evaluation in the circuit is recommended to ensure performance requirements are satisfied. A minimum of 4.7 µF is necessary for stability, with twice that value recommended. The minimum recommended input capacitor is 1 µF. Problems do not occur with larger values of capacitance. However, extremely low ESR may result in unstable operation. Thus, the use of large value ceramic

capacitors is not recommended on the output.

EVALUATION BOARD

V

OUT

R

2

External

C

L

4.7 µF

GND

Transistor

R

1

R

IPK

TK73200

1

C

N

0.1 µF

C

P

0.1 µF

R

P

330k

C

IN

1 µF

TOKO

PULSE CURRENT LIMIT MODE

C

N

P

R

P

330 k

V

IN

C

IN

EMITTER

TK73200

EXTERNAL

TRANSISTOR

BASE

COLLECTOR

V

CONT

R

1

R

2

GND

C

L

V

OUT

R

IPK

The equation for the pulse output current limit is as follows:

I

V

OUT

(mA) = 90 (mV) / R

SET

IPK

(Ω)

CON

SOT23L-8 BOARD LAYOUT

V

IN

AP008-99

During the initial turn-on, charge (surge) current flows to

I

OUT

the output capacitor. This IC has a possibility for the current limit to operate and to turn off the output by the charge current of the output capacitor. Therefore, the relationship between CL and CP is set as shown in the

V

OUT

graph below:

1000

TOKO

100

(µF)

L

GND CON

June 1999 TOKO, Inc. Page 9

V

IN

AP008-99

C

10

1

STABLE REGION

1

100.10.01

CP (µF)

TK73200

APPLICATION INFORMATION (CONT.)

CONTINUOUS CURRENT LIMIT MODE

C

N

V

IN

C

IN

TK73200

R

IPK

EMITTER

EXTERNAL

TRANSISTOR

In the continuous current limit mode, the C

CONT

BASE

COLLECTOR

R

V

1

2

CONT

PULSE

GND

C

L

V

OUT

pin (pin 3) is directly connected to ground. The output current limit is set by R

according to the following equation:

IPK

I

(mA) = 100 (mV) / R

SET

IPK

(Ω)

If the continuous current limit mode is also used for output short circuit protection, the I

value is set 50% to 100%

SET

more than the maximum operating current. The current transistor is selected from the I voltage drops when the output current exceeds the I

value. The output

SET

value. However, the output voltage returns to normal once the output current decreases below the I

SET

value.

HIGH-SIDE SWITCHING

V

µ PRO

IN

TK73200

V

CONT

V

OUT

R

2

R

1

The high output voltage accuracy and low dropout voltage are maintained when the IC is turned ON/OFF by using the control pin as illustrated above.

V

DROP

VOLTAGE

REGULATOR

ON/OFF

CONTROL

V

OUT

High-side switching should not be implemented by an external transistor as shown above. This results in additional voltage drop and loss of accuracy.

Page 10 June 1999 TOKO, Inc.

TK73200

APPLICATION INFORMATION (CONT.)

EXTERNAL PNP POWER TRANSISTOR

This IC can use any kind of external transistor. The external transistor selection is a function of the load current, Hfe and power dissipation. See following chart:

LOAD CURRENT RECOMMENDED EXTERNAL TRANSISTOR RECOMMENDED R

0 ~ 180 mA 2SB624, 2SB1115, 2SB799 (NEC), 2SB970 (Matsushita) 0.33 ~ 0.39 0 ~ 300 mA 2SB1115, 2SB799 (NEC) 0.22 ~ 0.27

0 ~ 500 mA

2SB1114, 2SB1115 (NEC), 2SB1302 (Sanyo), 2SA1203, 2SA1213, 2SA1734 (Toshiba)

0.12 ~ 0.15

0 ~ 1 A 2SA1242, 2SA1736 (Toshiba), 2SB1302, 2SA1896 (Sanyo) 0.056 ~ 0.068 0 ~ 2 A 2SA1451, 2SA1242 (Toshiba) 0.033 ~ 0.039 0 ~ 3 A 2SA1451 (Toshiba), 2SA1645 (NEC) 0.022 ~ 0.027 0 ~ 4 A 2SA1451 (Toshiba), 2SB904 (Sanyo), 2SA1645 (NEC) 0.012 ~ 0.015

VOLTAGE BACKUP OPERATION (HOLDUP TIME)

V

OUT

V

VOLTAGE

DETECTOR

IC

IN

V

CONT

OFF

73200

R

2

R

1

µ PRO

RESET

C

L

PARALLEL ON/OFF CONTROL OPERATION

V

IN

R

TK73200

TK11230B

TK11220B

R

2

R

1

5 V 5 A

3 V

100 mA

2 V

100 mA

IPK

(Ω)

ON/OFF

CONTROL

CL becomes the backup power supply when the microprocessor is reset with the voltage detector IC simultaneously with turning OFF the TK73200. CL provides the holdup time necessary to do an orderly shutdown of the microprocessor.

The figure above illustrates multiple regulators being controlled by a single ON/OFF control signal. The series resistor R is put in the input line of the low output voltage regulator in order to prevent overdissipation. The voltage dropped across the resistor reduces the large input-tooutput voltage across the regulator, reducing the power dissipation in the device.

June 1999 TOKO, Inc. Page 11

TK73200

PACKAGE OUTLINE

SOT23L-8

8

Product Code

1

Marking Information

TK73200 C00

0.45

5

marking

Voltage Code

4

e

0.8

+0.3

- 0.1

3.5

(3.4)

0.3

0.1

1.4max

Çl

1.2

(0.3)

1.0

Recommended Mount Pad

3.0 1

e

0.8

e

2.2

15 max

0.1

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

0 - 0.1

+0.15

- 0.15

0.15

+ 0.3

3.3

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

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 12 June 1999 TOKO, Inc.

IC-xxx-TK732xx

0798O0.0K

Printed in the USA