TK70001 SINGLE INPUT, TWO OUTPUT SOLID STATE SWITCH FEATURES APPLICATIONS ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Internal PNP Power Transistor Reverse Bias Voltage Protection Very Low Input-Output Voltage Difference Very Low Standby Current Overtemperature Protection Single Input with Two Controlled Outputs Low Noise Battery Powered Systems Radio Control Systems Automatic Test Equipment (ATE) Power Management Process Control Equipment Power Distribution Control Communication Equipment DESCRIPTION The TK70001 is a monolithic bipolar integrated circuit with high side current switches of low saturation type. The current, including the control current, is zero (pA level) when the control pin is “off”. The impedance on the output side is high and the reverse current does not flow when the control pin is “off”. These are effective to decrease the dissipation currents, making the TK70001 a very efficient device for power management and power distribution control. TK70001 OUTPUT 1 01 S INPUT OUTPUT 2 CONT 1 GND CONT 2 The TK70001 is available in a miniature SOT-26 surface mount package. When mounted as recommended, this package is capable of dissipating up to 350 mW. BLOCK DIAGRAM ORDERING INFORMATION INPUT TK70001MCB OUTPUT 2 OUTPUT 1 Tape/Reel Code THERMAL PROTECTION TAPE/REEL CODE B: Tape Left CONT 2 SW CIRCUIT CONT 1 GND January 1999 TOKO, Inc. Page 1 TK70001 ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................... 14 V Output Current .................................................... 130 mA Power Dissipation (Note 1) ................................ 350 mW Storage Temperature Range ................... -55 to +150 °C Operating Temperature Range ...................-30 to +80 °C Operating Voltage Range ............................... 1.6 to 12 V Junction Temperature .......................................... 150 °C Lead Soldering Temperature (10 s) ..................... 235 °C TK70001 ELECTRICAL CHARACTERISTICS Test conditions: TA = 25 °C, VIN = 2.5 V, unless otherwise specified. SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNITS IQ Quiescent Current IOUT = 0 mA, ICONT = 50 µA 0.6 1.2 mA ISTBY Standby Current VIN = 8 V, Output OFF, VCONT = 0 V 0.1 100 nA IOUT Output Current IGND Ground Current (Note 3) IOUT = 50 mA, ICONT = 50 µA 3.5 5.5 mA VDROP Dropout Voltage IOUT = 50 mA, ICONT = 50 µA 0.17 0.35 V ∆VD Balance Between Channels VDROP difference, IOUT = 50 mA, ICONT = 50 µA 50 mV IREV Reverse Bias Current VIN = 0 V, VREV = 8 V, VCONT = 0 V, Output OFF 0.02 50 nA 95 140 µA VDROP = 0.5 V, ICONT = 50 µA 60 100 mA VDROP = 0.5 V, ICONT = 100 µA 80 130 mA ON/OFF CONTROL TERMINAL ICONT Control Terminal Current VCONT = 1.6 V, IOUT = 50 mA 50 VCONT(ON) Control Voltage (ON) Output ON 1.0 VCONT(OFF) Control Voltage (OFF) Output OFF (Note 2) V 0. 2 V Note 1: Power dissipation is 350 mW when mounted as recommended. Derate at 2.8 mW/°C for operation above 25°C. Power dissipation is 150 mW in Free Air. Derate at 1.2 mW/°C for operation above 25 °C. Note 2: By grounding this terminal, the operation completely stops and the input current decreases to a pA level. Note 3: Ground current is defined as IIN - IOUT, excluding control terminal current. Refer to “Definition of Terms.” Gen. Note: Parameters with min. or max. values are 100% tested. Gen. Note: Exceeding “Absolute Maximum Ratings” can damage the device. Page 2 January 1999 TOKO, Inc. TK70001 TEST CIRCUIT INPUT IIN VIN CIN 1 µF VOUT 2 OUTPUT 1 OUTPUT 2 IOUT 2 VOUT 1 IOUT 1 CL 2 = 0.1 µF CL 1 = 0.1 µF CONT 2 ICONT 2 CONT 1 RCONT 2 RCONT 1 ICONT 1 VCONT 2 VCONT 1 TYPICAL PERFORMANCE CHARACTERISTICS 100 400 140 125 mA 10K 80 30K 200 50 mA 100 100 50K 60 75K 40 0 50 100 VIN = 1.5 V VIN = 3.0 V VIN = 4.5 V VIN = 6.0 V 20 0 1 2 3 4 ICONT ( A) VCONT (V) DROPOUT VOLTAGE VS. OUTPUT CURRENT QUIESCENT CURRENT VS. INPUT VOLTAGE 0 60 100K 20 IOUT = 25 mA IOUT (mA) 75 mA 0 20K RCONT = 0 100 mA ICONT ( A) VDROP (mV) 300 0 MAX OUTPUT CURRENT VS. CONTROL CURRENT CONTROL CURRENT VS. CONTROL VOLTAGE DROPOUT VOLTAGE VS. CONTROL CURRENT 10 5 20 30 40 50 ICONT ( A) REVERSE CURRENT VS. REVERSE VOLTAGE 2 500 ICONT = 50 A VIN = 5.0 V VIN = 1 V 300 400 ICONT = 40 A 250 ICONT = 30 A 50 100 IOUT (mA) January 1999 TOKO, Inc. 1 ICONT = 20 A VIN = 2.5 V 0 IREV (nA) 200 IQ ( A) VDROP (mV) 100 ICONT = 10 A 150 0 0 5 10 VIN (V) 15 0 0 5 10 15 VREV (V) Page 3 TK70001 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) GROUND CURRENT VS. OUTPUT CURRENT QUIESCENT CURRENT VS. INPUT VOLTAGE DROPOUT VOLTAGE VS. OUTPUT CURRENT 10 AT 2 CIRCUIT PARALLEL 0 5.0 5 IQ (mA) VDROP (mV) IGND (mA) -100 -200 ICONT = 150 µA 2.5 -300 ICONT = 100 µA ICONT = 50 µA -400 0 0 50 100 0 0 100 IOUT (mA) 200 0 5 10 15 VIN (V) IOUT (mA) ON/OFF RESPONSE CIN = 0.1 µF CIN = 0 IOUT = 30 mA VIN CIN VCONT CIN must be over 0.1 µF 0 1 2 3 4 TIME (µs) ON/OFF RESPONSE CL = 0 CL = 0.01 µF IOUT = 30 mA VIN 1 µF CL CL = 0.001 µF VCONT 0 1 2 3 4 TIME (µs) Page 4 January 1999 TOKO, Inc. TK70001 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) LOAD RESPONSE CIN = 1 µF 50 mV/ DIV VOUT IOUT = 0 to 30 mA VIN CL = 0.1 µF 1 µF CL 30 mA IOUT 0 0 10 20 30 40 TIME (µs) January 1999 TOKO, Inc. Page 5 TK70001 DEFINITION AND EXPLANATION OF TECHNICAL TERMS DROPOUT VOLTAGE (VDROP) ON/OFF CONTROL CURRENT The output voltage decreases with the increase of output current. It is dependent upon the load current and the junction temperature. The dropout voltage is the difference between the input voltage and the output voltage. The measurement current is IOUT = 50 mA. (ICONT = 50 µA, VIN = 2.5 V). The characteristics of TK70001 change by the value of control current. Please refer to the electrical characteristics graphs on the data sheet and determine the optimum value. The standard measurement condition is ICONT = 50 µA. (The application is max. ICONT = 200 µA). In the condition where there is very little output current, connect the resistor RCONT to the control terminal (please consider the reduction of the terminal voltage, the resistance value, etc.). This current can be lowered. OUTPUT CURRENT (IOUT) The rated output current is specified under the condition where the output voltage drops 0.5 V below the no load value. The input voltage is set to 2.5 V, and the current is pulsed to minimize temperature effects. QUIESCENT CURRENT (IQ) The quiescent current is the current which flows through the ground terminal under no load conditions (IOUT = 0 mA) with VIN = 2.5 V and excludes the control pin current. STANDBY CURRENT (ISTBY) Standby current is the current which flows into the solid state switch when the output is turned off by the control function (VCONT = 0 V). It is measured with VIN = 8 V. GROUND CURRENT (IGND) Ground current is the current which flows through the ground pin(s). It is defined as IIN - IOUT, excluding control current. ON/OFF CONTROL High is “on” (referenced to ground). The input current is at the pA level by connecting the control terminal to ground. 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. Page 6 THERMAL SENSOR The thermal sensor protects the device in the event that the junction temperature exceeds the safe value (Tj = 150 °C). This temperature rise can be caused by external heat, excessive power dissipation caused by large input to output voltage drop, or excessive output current. The switch will shut off when the temperature exceeds the safe value. As the junction temperature decreases, the switch will begin to operate again. Under sustained fault conditions, the switch output will cycle as the device turns off, and then resets. Damage may occur to the device under extreme fault conditions. 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 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-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 January 1999 TOKO, Inc. TK70001 DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.) 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 maximum operating current is: IOUT = (DPD / (VIN(MAX) - VOUT) 450 MOUNTED AS SHOWN 350 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 PD (mW) Tj = 0jA x PD + TA 250 FREE AIR 150 50 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. 0 0 50 100 150 TA ( C) SOT-26 POWER DISSIPATION The range of usable currents can also be found from the graph below. APPLICATION INFORMATION (mW) 3 PD BOARD LAYOUT 6 DPD The copper pattern should be as large as possible. 4 5 25 50 75 TA ( C) 150 OUTPUT 2 INPUT + OUTPUT 1 Procedure: + + 1) 2) 3) 4) Find PD PD1 is taken to be PD x (~ 0.8 - 0.9) Plot PD1 against 25 °C 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. January 1999 TOKO, Inc. CONT 1 GND CONT 2 PCB: CLASS EPOXY T=0.8 mM SOT-26 BOARD LAYOUT Page 7 TK70001 PACKAGE OUTLINE Marking Information SOT-26 (SOT-23-6) TK70001 0.7 Marking 01S Marking 5 1.0 4 (0.6) 1.6 e 1 2.4 (0.6) 6 1 2 e e 0.95 e 3 0.3 0.95 1.90 + 0.1 Recommended Mount Pad e 0.95 e 0.95 (1.9) 0.1 M Dimensions are shown in millimeters Tolerance: x.x = 0.2 mm (unless otherwise specified) + 0.1 0.15 0-13 0 ~ 0.1 0.1 1.1 1.4 max 2.9 2.8 + 0.3 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 8 © 1999 Toko, Inc. All Rights Reserved January 1999 TOKO, Inc. IC-216-TK70001 0798O0.0K Printed in the USA