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| TK70403 1.03 V REGULATOR WITH ON/OFF SWITCH FEATURES s s s s s s Low Input Voltage Operation (Single Battery Cell) Internal PNP Transistor Internal Shutdown Control (Off Current, 0.1 A max) Low Dropout Voltage [30 mV (typ.) at 2 mA] Miniature Package (SOT-26) Very Low Noise APPLICATIONS s s s s s Pagers Personal Communication Equipment Portable Consumer Equipment Radio Control Systems Single Battery Cell Systems 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. The TK70403 is available in a miniature SOT-26 surface mount package. TK70403 VOUT 20 P NOISE BYPASS GND CONTROL GND VIN ORDERING INFORMATION BLOCK DIAGRAM TK70403MTB VIN VOUT Tape/Reel Code TAPE/REEL CODE TB: Tape Left CONTROL BANDGAP REFERENCE GND NOISE BYPASS 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 Operating Temperature Range ...................-10 to +60 C Operating Voltage Range .............................. 0.9 to 5.0 V Lead Soldering Temperature (10 s) ...................... 235 C TK70403 ELECTRICAL CHARACTERISTICS Test Conditions: VIN = 1.4 V, TA = 25 C, RCONT = 820 K, unless otherwise specified. SYMBOL ISTBY VOUT VDROP IOUT IQ Line Reg Load Reg VOUT /T Vref PARAMETER Standby Current Output Voltage Dropout Voltage Output Current Quiescent Current Line Regulation Load Regulation Temperature Coefficient Reference Voltage TEST CONDITIONS VIN = 1.4 V, Output OFF IOUT = 2 mA IOUT = 2 mA (Note 2) IOUT = 0 mA, Excluding ICONT VIN = 1.43 to 1.7 V IOUT = 0.1 to 5.0 mA IOUT = 2 mA 0.4 0.25 10 50 150 20 20 0.98 1.03 MIN TYP MAX 0.1 1.065 0.06 UNITS A V V mA A mV mV mV/ C V CONTROL TERMINAL SPECIFICATIONS: RCONT = 820 K ICONT VCONT(ON) VCONT(OFF) Control Terminal Current Control Voltage (ON) Control Voltage (OFF) VCONT = 1.0 V, Output ON Output ON Output OFF 0.85 0 0.3 1.0 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. Note 2: IOUT when VOUT drops 0.4 V from VOUT(TYP). Gen Note: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. Example: Ripple rejection is 48 dB at CL = 1 F, CN = 0.1 F, IOUT = 2 mA, f = 400 Hz. Gen Note: Parameters with min. or max. values are 100% tested at TA = 25 C. Page 2 January 1999 TOKO, Inc. TK70403 TEST CIRCUIT IIN VIN VIN 1 F GND VOUT 1 F IOUT VOUT CONT VCONT ICONT RCONT 820 k GND NOISE BYPASS CN 0.1 F TYPICAL PERFORMANCE CHARACTERISTICS TA = 25 C, unless otherwise specified. OUTPUT VOLTAGE VS. OUTPUT CURRENT 1.5 1.2 VOUT (V) OUTPUT VOLTAGE VS. OUTPUT CURRENT 1.05 1.04 OUTPUT VOLTAGE VS. INPUT VOLTAGE 1.08 IOUT = 0 mA VOUT (V) 1.03 1.02 1.01 0.9 0.6 0.3 1.2 V 0 VIN = 1.1 V 1.6 V VOUT (V) 1.4 V 1.04 2.5 mA 1.00 5.0 mA 0.96 0.92 7.5 mA 0 5 IOUT (mA) 10 0 50 IOUT (mA) DROPOUT VOLTAGE VS. OUTPUT CURRENT 100 0.8 1.0 1.2 1.4 1.6 1.8 VIN (V) DROPOUT VOLTAGE VS. OUTPUT CURRENT 200 GROUND CURRENT VS. OUTPUT CURRENT 2.5 2.0 IGND (mA) 1.5 1.0 0.5 0 0 10 20 30 40 50 IOUT (mA) 100 80 VDROP (mV) 60 40 20 0 VDROP (mV) 0 2 4 6 8 10 100 0 0 10 20 30 40 50 IOUT (mA) IOUT (mA) January 1999 TOKO, Inc. Page 3 TK70403 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, unless otherwise specified. INPUT CURRENT VS. INPUT VOLTAGE (CONTROL ON) 500 400 IIN (A) INPUT CURRENT VS. INPUT VOLTAGE (CONTROL OFF) 200 VOUT (10 mV/ DIV) LINE VOLTAGE STEP RESPONSE IOUT = 0 mA 1.5 V VIN 1.4 V CN = 0 F 300 200 100 0 IIN (pA) TA = 60 C TA = 25 C VOUT 100 CN = 0.1 F 0 1 VIN (V) 2 0 0 1 VIN (V) 2 TIME (50 S/DIV) VIN TK70403 VOUT CN VCONT 0.1 F CL 1F RIPPLE REJECTION CIRUIT OUTPUT CURRENT VS. TEMPERATURE 60 2.0 CONTROL CURRENT VS. TEMPERATURE 40 DROPOUT VOLTAGE VS. TEMPERATURE 1.5 ICONT (A) IOUT (mA) IOUT = 2 mA VDROP (mV) 30 IOUT = 2 mA 50 1.0 20 40 0.5 10 30 -20 0 20 40 60 80 0 -20 0 20 40 60 80 0 -20 0 20 40 60 80 TA (C) TA (C) TA (C) Page 4 January 1999 TOKO, Inc. TK70403 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 C, unless otherwise specified. CONTROL VOLTAGE (ON) VS. TEMPERATURE 1000 800 VCONT(ON) (mV) GROUND CURRENT VS. TEMPERATURE 300 250 IOUT = 10 mA IGND (A) 200 150 100 IOUT = 5 mA 600 400 200 0 50 0 -20 -20 0 20 40 60 80 0 20 40 60 80 TA (C) TA (C) January 1999 TOKO, Inc. Page 5 TK70403 DEFINITION AND EXPLANATION OF TECHNICAL TERMS OUTPUT VOLTAGE (VOUT) The output voltage is specified with VIN = VOUT(TYP) + 0.4 and IOUT = 2 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 value is reduced. It is dependent upon the load current and the temperature. OUTPUT CURRENT (IOUT(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 VOUT + 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) 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 (IOUT = 0 mA). GROUND CURRENT (IGND) Ground current is the current which flows through the ground pin(s). It is defined as IIN - IOUT, excluding control 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, IOUT = 2 mA superimposed on the input voltage, where VIN = VOUT(TYP) + 0.4 V. The ripple rejection is the ratio of the output vs. input and is expressed in dB. Page 6 0 0 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 (RCONT) between the control terminal and VIN. Changes in the on/off level, due to this connection, are shown below. 2 VOUT = 1 M ICONT (A) VOUT = 680 k 1 RCONT = 820 k 1 VCONT (V) 2 ON/OFF RESPONSE WITH CONTROL (SPEED) 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 F, CN = 1000 pF will be the best for fastest operation. .1 .01 CN 1000 pF 100 pF 10 pF 0 0 CL = 2.2 F CL = 0.45 F CL = 0.68 F CL = 4.7 F 100 RISE TIME (s) 1000 January 1999 TOKO, Inc. TK70403 DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.) CL = 0.47 F CL = 2.2 F CL = 4.7 F CL = 0.68 F 0 50 TIME (s) 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 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. INPUT AND OUTPUT CAPACITORS Toko regulators require an output capacitor in order to maintain regulator loop stability. The capacitor value should be at least 0.68 F over actual ambient operating 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 (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 January 1999 TOKO, Inc. 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 + 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 VCONT VOUT 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. Page 7 TK70403 DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.) 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: 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. The maximum operating current is: IOUT = (DPD / (VIN(MAX) - VOUT) 450 350 PD (mW) MOUNTED AS SHOWN 250 FREE AIR 150 50 0 0 50 TA (C) 100 150 SOT-26 POWER DISSIPATION CURVE Page 8 January 1999 TOKO, Inc. TK70403 APPLICATION INFORMATION BOARD LAYOUT GND VIN VOUT + + CONTROL SOT-26 BOARD LAYOUT January 1999 TOKO, Inc. Page 9 TK70403 PACKAGE OUTLINE Marking Information Marking 03J SOT-26 (SOT-23-6) 0.7 TK70403 Marking (0.6) 1.0 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. Page 10 (c) 1999 Toko, Inc. All Rights Reserved IC-216-TK70001 0798O0.0K 0-13 January 1999 TOKO, Inc. Printed in the USA |
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