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| Solved by SP619 TM High Current Power Switch * Max Rds(on) .377 Ohms * Overcurrent deactivation 800mA * Max leakage current less than 2A while deactivated * Small 6 pin SOT-23 package * Built-in Over-temperature Protection * Wide Input voltage range 2.5V to 7V FEATURES 6 5 SP619 SOT23-6 4 APPLICATIONS * Ultra low cost handsets * PDA, DSC, MP3 players * Cell phones * Power Distribution Switch * Battery-Charger Circuit 1 2 3 DESCRIPTION The SP69 is a low Rds(on) high current switch designed with precision current limiting to protect connected devices from damage due to a short circuit condition or against current surges that may cause the supply voltages to fall out of regulation. This switch operates from an input voltage range of 2.5V to 7V, making it ideal for 3V and 5V applications. The SP69 is also protected from thermal overload which limits power dissipation. In shutdown mode, the supply current drops to 2A. TyPICAL APPLICATION CIRCUIT Vin SP619 Vin Vout Cin .1F 100K Cout .1F LOAD EN ON/OFF 80K GND Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation AbSOLUTE MAxIMUM RATINgS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Vin...................................................-0.3V to 7V Storage Temperature...................... -65C to 50C Junction Temperature..................... ...............50C Lead Temperature (Soldering, 0 sec).............300C ESD RATING Human Body Model...................................2000V Machine Model...........................................200V OPERATING RATINGS Thermal resistance SOT23-6 Junction to Ambient....................................9C Junction to lead ..........................................50C Unless otherwise specified: Vin = 2.5V - 7V, Cin = 0.F, Ta = -40C to + 85C PARAMETER Operating Input Voltage Range Overcurrent Deactivation Range Overcurrent Duration Before Deactivation Shutdown Supply Current Quiescent Supply Current Quiescent Supply Current Rds(on) Post Fault Output Load for Recovery Post Fault Activation Turn On Time Thermal Shutdown Die Temperature Thermal Restart Die Temperature ENABLE Logic LOW ENABLE Pin Logic HIGH Turn On Delay Turn Off Delay Rise Time Fall Time Driver is disabled Driver is active Rl=100k, Cl= 0.0F (Note 2,3) Rl=100k, Cl= 0.0F (Note 2,4) Rl=100k, Cl= 0.0F (Note 2) Rl=100k, Cl= 0.0F (Note 2) .655 EN=1.5V EN=1.5V Vin=4.2V EN=1.5V Vin=4.2V Iout=0mA EN=1.5V Vin=4.2V Iout=725mA Vin=2.5V Iout=00mA EN=1.5V Enable=1.5V Enable=1.5V SP69 will self recover when temperature drops below the trip point . 0 20 CONDITIONS MIN 2.5 725 RECOMMENDED OPERATINg CONDITIONS TYP (Note ) MAX 7 800 00 5.25 2 350 5.25 .377 5 23 55 50 80 UNITS V mA ms A A mA K ms C 90 20 35 .5 .4 600 200 00 2500 C V V s s s s Note 1: Typicals are Tj=25C Note 2: Characterized, not 100% tested Note 3: Turn on delay is measured from the time the enable pin is turned on to the time it takes the output to rise to 10% of its final value. Note 4: Turn off delay is measured from the time the enable pin is turned to the time it takes for the output to fall to 90% of its current value. Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation 2 FAULT AND RECOVERy TRUTH TAbLE* Enable Low High High High High High High Load X < 800 mA < 800 mA > 800 mA > 800 mA < 15k < 15k Temperature (TJ) X < 63C > 63C < 63C > 63C < 63C > 63C Previous State X Off Off Off Off Overcurrent Overcurrent Switch Open Closed Open Open Open Open Open Current State/Fault (Note*) Off Normal Thermal Cutoff Overcurrent Thermal Cutoff, Overcurrent Load Condition Thermal Cutoff, Overcurrent, Load Condition Normal Thermal Cutoff Load Condition Load Condition, Thermal Cutoff Normal Thermal Cutoff High High High High High High > 15k > 15k < 15k < 15k > 15k > 15k < 63C > 63C < 20C > 20C < 20C > 20C Overcurrent Overcurrent Thermal Cutoff Thermal Cutoff Thermal Cutoff Thermal Cutoff Closed Open Open Open Closed Open *Note: This table is for fault conditions, not for continuous operation, else damage to the device may occur. In order to recover to the normal state after a Thermal Cutoff fault, the part's junction temperature must decrease below 120C and the load on its output must be greater than 15k. PIN ASSIgNMENTS PIN NUMbER 2 3 4 5 6 PIN NAME Vin GND Enable NC NC Vout FUNCTION Input power supply pin (2.5V to 7.0V) Ground connection A logic high turns on the switch No connect No connect Switch output Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation 3 The SP69 is a switch capable of handling up to 800mA of current. 7V capability allows the user to have a wide input voltage range that covers the typical Lithium battery range as well as higher 5V input voltage rails commonly found in USB power. The SP69 also can be used as a 3V or 5V power distribution switch. It is intended for power distribution applications where short circuits are likely to be encountered. Short circuit operation When the SP69 enters a short circuit condition, the switch is disabled. The output of the SP69 will not restart until the output impedance is greater than 15K. The enable pin can be used to re-enable the SP69 into any load condition that is not a fault condition. Refer to the truth table on page 4 for more information on the different SP69 switch states. The typical deactivation time is about 2ms. Enable The enable pin allows easy control of the SP69. The enable pin should not be enabled high prior to a voltage being present on the input of the device. The enable pin should not exceed the input voltage by more than 0.1V due to an internal ESD diode. Doing so will affect the operation of the SP69 and could damage the device. In a typical application an 80K resistor to GND should be used on the enable pin. This resistor will pull the enable low when an enable signal is not present. This prevents the SP69 from falsely turning on. The enable pin can also be used to restart the part into a load condition that is high in current. Please refer to the truth table on page 4 for more details. Inrush Current The SP69 is a simple resistive switch. When the switch is turned on into a highly capacitive load there could be a significant THEORy OF OPERATION inrush current that can be encountered. At 6 volts in, the inrush current was about 250mA into a 00F capacitor. Output Voltage Rise Time The output voltage of the SP69 has an output capacitance dependency on the slope of Vout. A simple RC circuit is created when the switch is turned on. Equation 1 -t V(t)=Vo+Vin Rds(on) * Cout -e ( ( Where Vo is initial Voltage condition typically 0V Vin is the input voltage Rds(on) is the switch resistance Cout is the output capacitance For 4.2V Vin and 00F output capacitance we get about 150ns delay in figure 2. 4.17 3.33 VOUT 2.5 1.67 0.83 0 0 0.33 0.67 1 time in uS 1.33 1.67 2 This is comparable to actual measured value in figure 3. Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation 4 Overtemperature Protection The SP69 has built-in overtemperature protection to protect the part against damage if the die temperature gets too hot. The typical thermal cutoff is about 50C. The part will self recover if the temperature drops below the thermal restart threshold of about 20C. Layout Considerations The input and output decoupling capacitors should be placed as close as possible to the input and output pins. The GND pin should be stitched to the GND plain to help with thermal performance. The input and output traces should be as large as possible. The 100K is also recommended in the design and should be placed close to the output decoupling cap. THEORy OF OPERATION Vin 146-6642-00 U1 Vout ON/OFF Solved by GND TM SP619 Recommended Layout Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation 5 6 PIN SOT-23 Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation 6 ORDERINg INFORMATION Part number SP619EK-L SP619EK-L/TR Temperature range From -40 to +85C From -40 to +85C Package Type Lead Free 6 pin SOT23 Lead Free 6 pin SOT23 For availability of "M" temperatures (-40 to +25C) or in other packages contact factory. /TR = Tape and Reel. For further assistance: Email: WWW Support page: Sipex Application Notes: Sipexsupport@sipex.com http://www.sipex.com/content.aspx?p=support http://www.sipex.com/applicationNotes.aspx Solved by Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 TM Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Jul23-07 Rev K SP69 High Current Power Switch (c) 2007 Sipex Corporation 7 |
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