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| TK111xxS VOLTAGE REGULATOR WITH ON/OFF SWITCH FEATURES s s s s s s s s s High Voltage Precision at 2.0% or 60 mV Active High On/Off Control Very Low Dropout Voltage (85 mV at 30 mA) Very Low Noise Miniature Package (SOT-23-5) Internal Thermal Shutdown Short Circuit Protection Excellent Ripple Rejection (70 dB @ 1 kHz) Reverse Bias Protection APPLICATIONS s s s s s s s s Battery Powered Systems Cellular Telephones Pagers Personal Communications Equipment Portable Instrumentation Portable Consumer Equipment Radio Control Systems Toys DESCRIPTION The TK111xxS is a low dropout linear regulator with a builtin electronic switch. The internal 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 logic high level. An external capacitor can be connected to the noise bypass pin to lower the output noise level to 30 Vrms. An internal PNP pass transistor is used to achieve a low dropout voltage of 85 mV (typ.) at 30 mA load current. The TK111xxS has a very low quiescent current of 140 A (typ.) at no load . The standby current is 100 nA maximum. The internal thermal shut down circuitry limits the junction temperature to below 150 C. The load current is internally monitored and the device will shut down in the presence of a short circuit or overcurrent condition at the output. The TK111xxS is available in a miniature SOT-23-5 surface mount package. 20 P TK111xxS CONTROL GND NOISE BYPASS VIN VOUT BLOCK DIAGRAM ORDERING INFORMATION TK111 Voltage Code SL Tape/Reel Code Temp. Code Package Code VIN 5 VOUT THERMAL PROTECTION CONTROL VOLTAGE CODE 20 = 2.0 V 21 = 2.1 V 22 = 2.2 V 23 = 2.3 V 24 = 2.4 V 25 = 2.5 V 27 = 2.7 V 28 = 2.8 V 29 = 2.9 V 30 = 3.0 V 31 = 3.1 V 32 = 3.2 V 33 = 3.3 V 34 = 3.4 V 35 = 3.5 V 36 = 3.6 V 37 = 3.7 V 38 = 3.8 V 39 = 3.9 V 40 = 4.0 V 41 = 4.1 V 42 = 4.2 V Note 1: 2.0 to 2.3 V 43 = 4.3 V available in C 44 = 4.4 V temperature code 45 = 4.5 V (-30 to +80 C) only 46 = 4.6 V 47 = 4.7 V 48 = 4.8 V 49 = 4.9 V 50 = 5.0 V TAPE/REEL CODE L: Tape Left PACKAGE CODE S: SOT-23-5 C: -30 to +80 C I: -40 to +85 C BANDGAP REFERENCE GND TEMP. CODE NOISE BYPASS March 1999 TOKO, Inc. Page 1 TK111xxS ABSOLUTE MAXIMUM RATINGS TK111xxSCL Supply Voltage ......................................................... 16 V Control Terminal Voltage ......................................... 12 V Noise Bypass Terminal Voltage ................................. 5 V Power Dissipation (Note 1) ................................ 500 mW Reverse Bias ............................................................ 10 V Storage Temperature Range ................... -55 to +150 C Operating Temperature Range ...................-30 to +80 C Operating Voltage Range ............................... 1.8 to 12 V Junction Temperature ........................................... 150 C Lead Soldering Temperature (10 s) ...................... 235 C TK111xxSCL ELECTRICAL CHARACTERISTICS Test conditions: VIN = VOUT(TYP) + 1 V, TA = 25 C, unless otherwise specified. SYMBOL IQ ISTBY VOUT Line Reg PARAMETER Quiescent Current Standby Current Output Voltage Line Regulation TEST CONDITIONS IOUT = 0 mA, Excluding ICONT VIN = 6 V, Output OFF, VCONT 0.15 V IOUT = 10 mA, VIN = VOUT(TYP) + 1 V VIN = VOUT(TYP) + 1 V to VOUT(TYP) + 6 V, (Note 2) IOUT = 1 to 60 mA, (Note 2) IOUT = 1 to 100 mA, (Note 2) VDROP IOUT IOUT(PULSE) Dropout Voltage Continuous Output Current Pulse Output Current IOUT = 60 mA, (Note 2) (Note 2) 5 ms pulse, 12.5 % duty cycle, (Note 2) f = 1 kHz, CL = 4.7 F, CN = 0.1 F, VIN = VOUT(TYP) + 2 V, VR = 200 mVrms, IOUT = 10 mA, (Notes 3,4) 400 Hz f 80 kHz, CL = 4.7 F, CN = 0.01 F, VIN = VOUT(TYP) + 2 V, IOUT = 10 mA, (Notes 3,4) See Table 1 0.8 8 14 120 18 30 55 200 100 130 MIN TYP 140 MAX 200 0.1 UNITS A A V mV mV mV mV mA mA Load Reg Load Regulation RR Ripple Rejection 70 dB VNO Output Noise Voltage Noise Bypass Terminal Voltage Temperature Coefficient 30 Vrms Vref VOUT /T 1.25 IOUT = 10 mA 25 V ppm/ C CONTROL TERMINAL SPECIFICATIONS ICONT VCONT(ON) VCONT(OFF) Control Current Control Voltage ON Control Voltage OFF VCONT = 1.8 V, Output ON Output ON Output OFF 1.5 0.35 1.2 4 A V V Note 1: Power dissipation is 500 mW when mounted as recommended. Derate at 4.0 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: Output noise voltage can be reduced by connecting a capacitor to the noise bypass terminal. Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 C. Gen. Note: Exceeding the "Absolute Maximum Ratings" can damage the device. Page 2 March 1999 TOKO, Inc. TK111xxS ABSOLUTE MAXIMUM RATINGS TK111xxSIL (VOUT 2.4 V) Supply Voltage ......................................................... 15 V Control Terminal Voltage ......................................... 12 V Noise Bypass Terminal Voltage ................................. 5 V Power Dissipation (Note 1) ................................ 500 mW Reverse Bias ............................................................ 10 V Storage Temperature Range ................... -55 to +150 C Operating Temperature Range ................... -40 to +85 C Operating Voltage Range ............................... 2.0 to 12 V Junction Temperature ........................................... 150 C Lead Soldering Temperature (10 s) ...................... 235 C TK111xxSIL ELECTRICAL CHARACTERISTICS (VOUT 2.4 V) Test conditions: VIN = VOUT(TYP) + 1 V, TA = -40 to +85 C, unless otherwise specified. SYMBOL IQ ISTBY VOUT Line Reg PARAMETER Quiescent Current Standby Current Output Voltage Line Regulation TEST CONDITIONS IOUT = 0 mA, Excluding ICONT VIN = 6 V, Output OFF, VCONT 0.15 V IOUT = 10 mA, VIN = VOUT(TYP) + 1 V VIN = VOUT(TYP) + 1 V to VOUT(TYP) + 6 V, (Note 2) IOUT = 1 to 60 mA, (Note 2) IOUT = 1 to 100 mA, (Note 2) VDROP IOUT IOUT(PULSE) Dropout Voltage Continuous Output Current Pulse Output Current IOUT = 60 mA, (Note 2) (Note 2) 5 ms pulse, 12.5 % duty cycle, (Note 2) f = 1 kHz, CL = 4.7 F, CN = 0.1 F, VIN = VOUT(TYP) + 2 V, VR = 200 mVrms, IOUT = 10 mA, (Notes 3,4) 400 Hz f 80 kHz, CL = 4.7 F, CN = 0.01 F, VIN = VOUT(TYP) + 2 V, IOUT = 10 mA, (Notes 3,4) See Table 2 0.8 8 14 120 18 30 55 200 100 130 MIN TYP 140 MAX 200 0.2 UNITS A A V mV mV mV mV mA mA Load Reg Load Regulation RR Ripple Rejection 70 dB VNO Output Noise Voltage Noise Bypass Terminal Voltage Temperature Coefficient 30 Vrms Vref VOUT /T 1.25 IOUT = 10 mA 25 V ppm/ C CONTROL TERMINAL SPECIFICATIONS ICONT VCONT(ON) VCONT(OFF) Control Current Control Voltage ON Control Voltage OFF VCONT = 1.8 V, Output ON Output ON Output OFF 1.5 0.35 1.2 6 A V V Note 1: Power dissipation is 500 mW when mounted as recommended. Derate at 4.0 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: Output noise voltage can be reduced by connecting a capacitor to the noise bypass terminal. Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 C. Gen. Note: Exceeding the "Absolute Maximum Ratings" can damage the device. March 1999 TOKO, Inc. Page 3 TK111xxS TK111xxSCL ELECTRICAL CHARACTERISTICS TABLE 1 Output Voltage 3.6 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V 4.3 V 4.4 V 4.5 V 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V Voltage Code 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 VOUT(MIN) 3.528 V 3.626 V 3.724 V 3.822 V 3.920 V 4.018 V 4.116 V 4.214 V 4.312 V 4.410 V 4.508 V 4.606 V 4.704 V 4.802 V 4.900 V VOUT(MAX) 3.672 V 3.774 V 3.876 V 3.978 V 4.080 V 4.182 V 4.284 V 4.386 V 4.488 V 4.590 V 4.692 V 4.794 V 4.896 V 4.988 V 5.100 V Test Voltage 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V 5.1 V 5.2 V 5.3 V 5.4 V 5.5 V 5.6 V 5.7 V 5.8 V 5.9 V 6.0 V Output Voltage 2.0 V 2.1 V 2.2 V 2.3 V 2.4 V 2.5 V 2.7 V 2.8 V 2.9 V 3.0 V 3.1 V 3.2 V 3.3 V 3.4 V 3.5 V Voltage Code 20 21 22 23 24 25 27 28 29 30 31 32 33 34 35 VOUT(MIN) 1.940 V 2.040 V 2.140 V 2.240 V 2.340 V 2.440 V 2.640 V 2.740 V 2.840 V 2.940 V 3.038 V 3.136 V 3.234 V 3.232 V 3.430 V VOUT(MAX) 2.060 V 2.160 V 2.260 V 2.360 V 2.460 V 2.560 V 2.760 V 2.860 V 2.960 V 3.060 V 3.162 V 3.264 V 3.366 V 3.468 V 3.570 V Test Voltage 3.0 V 3.1 V 3.2 V 3.3 V 3.4 V 3.5 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V 4.3 V 4.4 V 4.5 V Page 4 March 1999 TOKO, Inc. TK111xxS TK111xxSIL ELECTRICAL CHARACTERISTICS TABLE 2 Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 30 mA, unless otherwise specified. Output Voltage 2.4 V 2.5 V 2.7 V 2.8 V 2.9 V 3.0 V 3.1 V 3.2 V 3.3 V 3.4 V 3.5 V 3.6 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V 4.3 V 4.4 V 4.5 V 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V Voltage Code 24 25 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Room Temp. Range (TA = 25 C) VOUT(MIN) VOUT(MAX) 2.340 V 2.440 V 2.640 V 2.740 V 2.840 V 2.940 V 3.038 V 3.136 V 3.234 V 3.332 V 3.430 V 3.528 V 3.626 V 3.724 V 3.822 V 3.920 V 4.018 V 4.116 V 4.214 V 4.312 V 4.410 V 4.598 V 4.696 V 4.794 V 4.892 V 4.900 V 2.460 V 2.560 V 2.760 V 2.860 V 2.960 V 3.060 V 3.162 V 3.264 V 3.366 V 3.468 V 3.570 V 3.672 V 3.774 V 3.876 V 3.988 V 4.080 V 4.182 V 4.284 V 4.366 V 4.488 V 4.590 V 4.692 V 4.794 V 4.896 V 4.998 V 5.100 V Full Temp. Range (TA = -40 to +85 C) VOUT(MIN) VOUT(MAX) 2.305 V 2.405 V 2.605 V 2.705 V 2.805 V 2.905 V 3.007 V 3.104 V 3.201 V 3.298 V 3.395 V 3.492 V 3.589 V 3.686 V 3.783 V 3.880 V 3.977 V 4.074 V 4.171 V 4.268 V 4.365 V 4.462 V 4.559 V 4.656 V 4.753 V 4.850 V 2.495 V 2.595 V 2.795 V 2.895 V 2.995 V 3.095 V 3.193 V 3.296 V 3.400 V 3.502 V 3.605 V 3.708 V 3.811 V 3.914 V 4.017 V 4.120 V 4.223 V 4.326 V 4.429 V 4.532 V 4.635 V 4.738 V 4.841 V 4.944 V 5.047 V 5.150 V March 1999 TOKO, Inc. Page 5 TK111xxS TEST CIRCUIT VIN IIN VIN CIN 1 F VOUT CL 2.2 F TANTALUM ESR = 1.6 IOUT CONT NOISE BYPASS CN = 0.0047 F ICONT VCONT TYPICAL PERFORMANCE CHARACTERISTICS TA = 25 C, unless otherwise specified. SHORT CIRCUIT CURRENT 5 4 VOUT (V) LOAD REGULATION OUTPUT VOLTAGE VS. INPUT VOLTAGE VOUT TYPICAL VOUT (25 mV/ DIV) VOUT (5 mV/ DIV) VOUT TYPICAL IOUT = 0 mA IOUT = 30 mA 3 2 1 0 IOUT = 60 mA IOUT = 90 mA 0 50 IOUT (mA) 100 0 150 IOUT (mA) 300 0 VIN = VOUT VIN (V) (50 mV/ DIV) LINE REGULATION VOUT TYPICAL VOUT (50 mV/ DIV) DROPOUT VOLTAGE VS. OUTPUT CURRENT 0 -100 VDROP (mV) -200 -300 -400 -500 IGND (mA) 10 8 6 4 2 0 0 GROUND CURRENT VS. OUTPUT CURRENT 0 10 VIN (V) 20 0 100 IOUT (mA) 200 75 IOUT (mA) 150 Page 6 March 1999 TOKO, Inc. TK111xxS TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, unless otherwise specified. STANDBY CURRENT (OFF MODE) VS. INPUT VOLTAGE 100 2 REVERSE BIAS CURRENT (VIN = 0 V) 500 400 ISTBY (pA) IREV (A) QUIESCENT CURRENT (ON MODE) VS. INPUT VOLTAGE IOUT = 0 mA IQ (mA) 300 200 100 0 0 VOUT = 3 V 1 50 10 VREV (V) CONTROL CURRENT VS. CONTROL VOLTAGE 20 0 0 10 VIN (V) 20 0 0 5 VIN (V) 10 GROUND CURRENT 2 IOUT = 60 mA 200 VDROP (mV) DROPOUT VOLTAGE 10 8 VOUT ICONT (A) 6 4 2 0 0 IGND (mA) IOUT = 100 mA 1 IOUT = 30 mA IOUT = 60 mA 100 IOUT = 30 mA 1 2 3 4 5 0 -50 0 TA (C) 50 100 0 -50 0 TA (C) 50 100 VCONT (V) CONTROL CURRENT 10 8 VCONT = 5 V 2 VCONT (VOUT, ON POINT) RCONT = 0 260 MAXIMUM OUTPUT CURRENT VOUT = 2.7 V OR ABOVE ICONT (A) VCONT (V) IOUT (mA) 0 TA (C) 50 100 250 240 230 220 6 4 VCONT = 1.8 V 2 0 -50 1 0 TA (C) 50 100 0 -50 -50 0 TA (C) 50 100 March 1999 TOKO, Inc. Page 7 TK111xxS TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, unless otherwise specified. OUTPUT VOLTAGE VARIATION 20 10 0 -10 -20 -30 -50 2.8 V 3.0 V 0 -20 RIPPLE REJECTION OUTPUT NOISE LEVEL VS. CN 250 200 IOUT = 60 mA IOUT = 30 mA CL = 2.2 F, CN = .01 F NOISE (V) VOUT (mV) RR (dB) CL = 2.2 F 150 CL = 3.3F 100 CL = 10 F 50 0 1 pF -40 CL = 4.7 F, CN = 0.1 F -60 -80 -100 0.01 CL = 4.7 F, CN = 1.0 F 1 f (kHz) 10 100 0 TA (C) 50 100 10 100 1000 CN 0.1 F .1 NOISE SPECTRUM 0 VIN LINE VOLTAGE STEP RESPONSE VOUT +2 V VOUT (10 mV/ DIV) VOUT (50 mV/ DIV) LOAD CURRENT STEP RESPONSE 1 100 mA IOUT CL = 2.2 F CN = 0.01 F VOUT +1 V CN = 0.001 F 1 OR 5 mA 1 TO 100 mA dB -50 CL = 3.3 F, CN = NONE CL = 3.3 F, CN = 0.1 F -100 0 SPECTRUM ANALYZER BACKGROUND NOISE CN = 0.01 F 5 TO 100 mA 500 k f (Hz) 1M 0 100 200 300 400 0 200 400 600 800 TIME (s) TIME (s) LOAD CURRENT STEP RESPONSE 2 50 mA CN = 0.01 F CL = 4.7 F IOUT 0 mA VOUT (10 mV/ DIV) CL = 2.2 F CL = 10 F CL = 47 F 0 2 4 TIME (ms) 6 8 Page 8 March 1999 TOKO, Inc. TK111xxS DEFINITION AND EXPLANATION OF TECHNICAL TERMS OUTPUT VOLTAGE (VOUT) The output voltage is specified with VIN = (VOUT(TYP) + 1 V) and IOUT = 10 mA. DROPOUT VOLTAGE (VDROP) 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 and the junction temperature. OUTPUT CURRENT (IOUT(MAX)) The rated output current is specified under the condition where the output voltage drops 0.3 V below the value specified with IOUT = 10 mA. The input voltage is set to VOUT +1 V, and the current is pulsed to minimize temperature effect. CONTINUOUS OUTPUT CURRENT (IOUT) Normal operating output current. This is limited by the package power dissipation. PULSE OUTPUT CURRENT (IOUT (PULSE)) Max pulse width 5 ms, Duty cycle 12.5%: pulse load only. SENSOR CIRCUITS LINE REGULATION (Line Reg) Overcurrent 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 = VOUT(TYP) + 1 V to VIN = VOUT(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 with the input voltage set to VIN = VOUT(TYP) +1 V. The load regulation is specified under two output current step conditions of 1 mA to 60 mA and 1 mA to 100 mA. QUIESCENT CURRENT (IQ) The quiescent current is the current which flows through March 1999 TOKO, Inc. 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 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. Page 9 The overcurrent sensor protects the device in the event that the output is shorted to ground. Thermal Sensor STANDBY CURRENT (ISTBY) Standby current is the current which flows into the regulator when the output is turned off by the control function (VCONT = 0 V). It is measured with VIN = 6 V. the ground terminal under no load conditions (IOUT = 0 mA). GROUND CURRENT Ground current is the current which flows through the ground pin(s). It is defined as IIN - IOUT, excluding control current. 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 200 mVrms, 1 kHz superimposed on the input voltage, where VIN = VOUT + 2 V. The output decoupling capacitor is set to 4.7 F, the noise bypass capacitor is set to 0.01 F, 0.1 F, 1.0 F and the load current is set to 10 mA. Ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in dB. Example: 64 dB at CN = 0.01 F, 70 dB at CN = 0.1 F, 74 dB at CN = 1.0 F. TK111xxS DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.) 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. REDUCTION OF OUTPUT NOISE Although the architecture of the Toko regulators is designed to minimize semiconductor noise, further reduction can be achieved by the selection of external components. The obvious solution is to increase the size of the output capacitor. A more effective solution would be to add a capacitor to the noise bypass terminal. The value of this capacitor should be 0.1 F 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. ON/OFF RESPONSE WITH CONTROL The turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. The turn-on time will increase with the value of either capacitor. The graphs below show the relationship between turn-on time and load capacitance. If the value of these capacitors is reduced, the load and line regulation will suffer and the noise voltage will increase. If the value of these capacitors is increased, the turn-on time will increase. OUTPUT VOLTAGE RESPONSE B (OFFON) ILOAD = 30 mA, CL = 2.2 F VCONT CN = 0.33 F CN = 0.1 F CN = 0.47 F CN = 0.68F VOUT CN = 1.0 F 0 2 4 TIME (ms) 6 8 CONTROL FUNCTION The TK111xxS has an active high control pin. The control pin requires over 1.8 V for operation and under 0.6 V for standby. For the range of 0.6 V < VCONT < 1.8 V, operation is undefined. If the control function is not used, connect the control pin to VIN. VCONT VIN OUTPUT VOLTAGE RESPONSE A (OFFON) ILOAD = 30 mA, CN = 3300 pF CL = 0.68 F CL = 0.47F SW CL = 1.5 F CL = 1.0 F VOUT CN -5 5 15 25 35 45 TIME (s) CONTROL FUNCTION Page 10 March 1999 TOKO, Inc. TK111xxS 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 (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-23-5 is increased to 500 mW. For operation at ambient temperatures over 25 C, the power dissipation of the SOT-23-5 device should be derated at 4.0 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) PD 3 DPD 6 4 5 25 50 75 TA ( C) 150 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. 1) 2) 3) 4) 1.0 0.8 PD (mW) MOUNTED AS SHOWN Tj = 0jA x PD + TA 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 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. 0.6 FREE AIR 0.4 0.2 0 0 50 TA (C) 100 150 SOT-23-5 POWER DISSIPATION CURVE March 1999 TOKO, Inc. Page 11 TK111xxS APPLICATION INFORMATION INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors in order to maintain regulator loop stability. The recommended minimum value of the input capacitor is 0.1 F. The output capacitor should be selected within the Equivalent Series Resistance (ESR) range as shown in the graphs below for stable operation. When a ceramic capacitor is connected in parallel with the output capacitor, a maximum of 1000 pF is recommended. This is because the ceramic capacitor's electrical characteristics (capacitance and ESR) vary widely over temperature. If a large ceramic capacitor is used, a resistor should be connected in series with it to bring it into the stable operating area shown in the graphs below. Minimum resistance should be added to maintain load and line transient response. Note: It is very important to check the selected manufacturers electrical characteristics (capacitance and ESR) over temperature. 111xxS CL ESR TK111xxS CL ESR Note: It is not necessary to connect a ceramic capacitor in parallel with an aluminum or tantalum output capacitor. CL = 1 F 100 100 CL = 2.2 F 100 CL = 3.3 F 100 CL = 10 F 10 10 10 10 ESR () ESR () ESR () 1 STABLE OPERATION AREA 1 STABLE OPERATION AREA 1 STABLE OPERATION AREA ESR () 1 STABLE OPERATION AREA 0.1 0.1 0.1 0.1 0 .01 1 50 IOUT (mA) 100 130 0 .01 1 50 IOUT (mA) 100 130 0 .01 1 50 IOUT (mA) 100 130 0 .01 1 50 IOUT (mA) 100 130 Page 12 March 1999 TOKO, Inc. TK111xxS APPLICATION INFORMATION (CONT.) The table below shows typical characteristics for several types and values of capacitance. Please note that the ESR varies widely depending upon manufacturer, type, size, and material. ESR Capacitance 1.0 F 2.2 F 3.3 F 10 F Aluminum Capacitor 2.4 2.0 4.6 1.4 Tantalum Capacitor 2.3 1.9 1.0 0.5 Ceramic Capacitor 0.140 0.059 0.049 0.025 Note: ESR is measured at 10 kHz. BOARD LAYOUT Copper pattern should be as large as possible. Power dissipation is 500 mW for the SOT-23-5. A low 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 1.0 F. VIN GND VOUT + + CONTROL NOISE BYPASS SOT-23-5 BOARD LAYOUT March 1999 TOKO, Inc. Page 13 TK111xxS NOTES Page 14 March 1999 TOKO, Inc. TK111xxS NOTES March 1999 TOKO, Inc. Page 15 TK111xxS PACKAGE OUTLINE Marking Information 0.7 SOT-23-5 TK111xxS Marking 1.0 5 4 (0.6) Product Code W Voltage Code 20 21 22 23 24 25 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 e 0.95 e' e 0.95 1.90 1 2 3 0.4 +0.15 -0.05 e 0.95 e 0.95 Recommended Mount Pad 0.1 M 2.9 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. Page 16 (c) 1999 Toko, Inc. All Rights Reserved IC-xxx-TK111S 0798O0.0K 0 - 15 2.8 TK11120S TK11121S TK11122S TK11123S TK11124S TK11125S TK11127S TK11128S TK11129S TK11130S TK11131S TK11132S TK11133S TK11134S TK11135S TK11136S TK11137S TK11138S TK11139S TK11140S TK11141S TK11142S TK11143S TK11144S TK11145S TK11146S TK11147S TK11148S TK11149S TK11150S 1.4 max (0.6) 1.6 1.1 (0.8) 0.15 - 0.05 0 - 0.1 +0.15 e1 2.4 max March 1999 TOKO, Inc. Printed in the USA |
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