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| TK70002 SINGLE INPUT, TWO OUTPUT SOLID STATE SWITCH FEATURES s s s s s s s 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 Active High On/Off Control APPLICATIONS s s s s s s Battery Powered Systems Radio Control Systems Automatic Test Equipment (ATE) Power Management Process Control Equipment Power Distribution Control DESCRIPTION The TK70002 is a monolithic bipolar integrated circuit with high side current switches of low saturation type. The supply current, including the control current, is virtually 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 TK70002 a very efficient device for power management and power distribution control. The TK70002 is available in a miniature SOT-23-6 surface mount package. When mounted as recommended, this package is capable of dissipating up to 350mW. TK70002 OUTPUT 1 20 P CONT 1 INPUT GND OUTPUT 2 CONT 2 ORDERING INFORMATION BLOCK DIAGRAM INPUT TK70002MCB Tape/Reel Code OUTPUT 2 OUTPUT 1 SW CIRCUIT THERMAL PROTECTION SW CIRCUIT CONT 1 TAPE/REEL CODE B: Tape Left CONT 2 BASE CONTROL CURRENT BASE CONTROL CURRENT GND January 1999 TOKO, Inc. Page 1 TK70002 ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................... 14 V Output Current .................................................... 130 mA Power Dissipation (Note 1) ................................ 350 mW Control Terminal Voltage ........................................... 8 V Reverse Bias Voltage ................................................. 8 V Storage Temperature Range ................... -55 to +150 C Operating Temperature Range ...................-30 to +80 C Operating Voltage Range ............................... 1.6 to 12 V Lead Soldering Temperature (10 s) ..................... 235 C TK70002 ELECTRICAL CHARACTERISTICS Test conditions: VIN = 2.5 V, TA = 25 C, unless otherwise specified. SYMBOL IQ ISTBY IOUT IGND VDROP VD IREV PARAMETER Quiescent Current Standby Current Output Current Ground Current (Note 3) Dropout Voltage TEST CONDITIONS IOUT = 0 mA, Exclude ICONT VIN = 8 V, Output OFF, VCONT = 0 V VDROP = 0.5 V IOUT = 50 mA IOUT = 50 mA 70 MIN TYP 0.25 0.5 110 2.5 0.18 1 0.3 4.5 0.35 25 50 MAX 0.65 100 UNITS mA nA mA mA V mV nA Balance Between Channels VDROP difference, IOUT = 50 mA Reverse Bias Current VIN = 0 V, VREV = 8 V, VCONT = 0 V ON/OFF CONTROL TERMINAL ICONT VCONT(ON) VCONT(OFF) Control Terminal Current Control Voltage (ON) Control Voltage (OFF) VCONT = 1.6 V Output ON Output OFF (Note 2) 1.2 0.3 7 15 A V 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 current. Refer to "Definition of Terms." Gen. Note: Parameters with min. or max. values are 100% tested. Gen. Note: Exceeding the "Absolute Maximum Ratings" can damage the device. Page 2 January 1999 TOKO, Inc. TK70002 TEST CIRCUIT INPUT CIN 0.1 F VIN IIN VOUT 2 IOUT 2 OUTPUT 2 OUTPUT 1 IOUT 1 VOUT 1 CL 2 = 0.1 F CL 1 = 0.1 F CONT 2 CONT 1 ICONT 2 VCONT 2 RCONT 2 RCONT 1 ICONT 1 VCONT 1 TYPICAL PERFORMANCE CHARACTERISTICS CONTROL CURRENT 1 VS. CONTROL VOLTAGE 100 VOUT 80 40 CONTROL CURRENT 2 VS. CONTROL VOLTAGE DROPOUT VOLTAGE VS. OUTPUT CURRENT 0 -100 60 40 20 0 RCONT = 0 30 20 10 0 RCONT = 0 100 k 200 k VDROP (mV) ICONT ( A) ICONT ( A) -200 -300 -400 VIN = 1.0 V 1.8V 1.2 V 1.6 V 1.4 V 0 2 4 6 8 10 0 1 2 3 4 5 0 50 IOUT (mA) REVERSE CURRENT VS. REVERSE VOLTAGE 100 VCONT (V) VCONT (V) DROPOUT VOLTAGE VS. OUTPUT CURRENT 0 -100 VDROP (mV) -200 -300 -400 0 10 VIN = 2.5 V IGND (mA) GROUND CURRENT VS. OUTPUT CURRENT 2 1.6 V 5 IREV (nA) PARALLEL OPERATION 1.8 V 1 SINGLE OPERATION VIN = 1.0 V 1.2 V 0 100 IOUT (mA) 200 1.4 V 0 0 50 IOUT (mA) 100 0 5 10 VREV (V) 15 January 1999 TOKO, Inc. Page 3 TK70002 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) GROUND CURRENT 3 DROPOUT VOLTAGE 140 240 VDROP (mV) OUTPUT CURRENT 130 IOUT(mA) IGND (mA) 200 IOUT = 50 mA 2 IOUT = 50 mA 120 110 100 90 -50 VIN = 2.5 V AT VDROP = 0.5 V 100 0 -50 0 50 TA (C) 100 -50 0 TA (C) 50 100 0 TA (C) 50 100 CONTROL VOLTAGE (VOUT = ON) 1.0 10 8 CONTROL CURRENT ON/OFF RESPONSE 1 CL = 0.01 F CL = 0.1 F VCONT = 1.6 V VCONT (V) ICONT (A) 6 4 2 0.5 VCONT ILOAD = 30 mA 0 TA (C) 50 100 0 -50 0 TA (C) 50 100 0 -50 0 1 0 TIME (s) 10 20 ON/OFF RESPONSE 2 CL = NONE CL = 0.01 F CL = 0.1 F LOAD STEP RESPONSE CL = 0.1 F 100 mV/DIV CL = 0.01 F VCONT ILOAD = 30 mA 0 1 2 3 4 0 4 TIME (s) ILOAD = 0 to 30 mA 8 TIME (s) 12 16 Page 4 January 1999 TOKO, Inc. TK70002 DEFINITION AND EXPLANATION OF TECHNICAL TERMS DROPOUT VOLTAGE (VDROP) The output voltage decreases with the increase of output current. It is dependent upon the load current and the junction temperature. It measures the differential voltage between the input voltage and the output voltage when the input voltage is set to 2.5 V and the output current is set to 50 mA. 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. 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 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-23-6 is increased to 350 mW. For operation at ambient temperatures over 25 C, the power dissipation of the SOT-23-6 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 + TA 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. January 1999 TOKO, Inc. Page 5 TK70002 DEFINITIONS AND TERMS (CONT.) The range of usable currents can also be found from the graph below. (mW) PD 3 APPLICATION INFORMATION BOARD LAYOUT OUTPUT 2 INPUT OUTPUT 1 DPD 6 4 5 GND 25 50 75 TA (C) 150 CONT 1 CONT 2 Procedure: 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. The maximum operating current is: IOUT = (DPD / (VIN(MAX) - VOUT) 1) 2) 3) 4) SOT-23-6 BOARD LAYOUT 450 350 PD (mW) 250 FREE AIR 150 50 0 0 50 TA (C) 100 150 MOUNTED AS SHOWN SOT-23-6 POWER DISSIPATION Page 6 January 1999 TOKO, Inc. TK70002 PACKAGE OUTLINE Marking Information Marking 02S SOT-26 (SOT-23-6) 0.7 TK70002 Marking 1.0 (0.6) 6 5 4 (0.6) 1.6 e 0.95 e e 0.95 1.90 1 2 3 0.3 + 0.1 Recommended Mount Pad e 0.95 e 0.95 (1.9) 0.1 M 2.9 e 1 2.4 1.4 max 1.1 0 ~ 0.1 0.1 0.15 2.8 + 0.3 + 0.1 Dimensions are shown in millimeters Tolerance: x.x = 0.2 mm (unless otherwise specified) 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. January 1999 TOKO, Inc. (c) 1999 Toko, Inc. All Rights Reserved IC-217-TK70002 0798O0.0K 0-13 Page 7 Printed in the USA |
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