SP619 High Current Power Switch FEATURES • Max RDS(ON) .377 Ohms • Overcurrent deactivation 800mA • Max leakage current less than 2µA while deactivated • Small 6 pin SOT-23 package • Built-in Over-temperature Protection • 4.5V to 5.5V input voltage range 6 5 4 SP619 SOT23-6 APPLICATIONS • Ultra low cost handsets • PDA, DSC, MP3 players • Cell phones • Power Distribution Switch • Battery-Charger Circuit 1 2 3 DESCRIPTION The SP619 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 is functional over an input voltage range of 2.5V to 7V, but is targeted at 5V applications. The SP619 is also protected from thermal overload which limits power dissipation. In shutdown mode, the supply current drops to 2µA. TYPICAL APPLICATION CIRCUIT Vin SP619 Vout Vin 100K Cin .1µF Cout .1µF LOAD EN ON/OFF 80K April 2008 Rev L GND SP619 High Current Power Switch 1 © 2008 EXAR 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 WKHVSHFL¿FDWLRQVEHORZLVQRWLPSOLHG([SRVXUHWR absolute maximum rating conditions for extended periods of time may affect reliability. VIN……….…………………………….….…-0.3V to 7V Storage Temperature..…....……….… -65°C to 150°C Junction Temperature..................... ……..…….150°C Lead Temperature (Soldering, 10 sec)......…….300°C (6'5$7,1* Human Body Model……………………….…….2000V Machine Model…………………………………....200V 23(5$7,1*5$7,1*6 Thermal resistance SOT23-6 Junction to Ambient……………………….….….191°C Junction to lead ……………………...……………50°C RECOMMENDED OPERATING CONDITIONS 8QOHVVRWKHUZLVHVSHFL¿HG9IN = 4.5V - 5.5V, CIN = 0.1µF, TA = -10°C to + 85°C 3$5$0(7(5 CONDITIONS MIN Operating Input Voltage Range TYP (Note 1) 4.5 Overcurrent Deactivation Range (1 9 620 Overcurrent Duration Before Deactivation (1 9 1 Shutdown Supply Current MAX 5.5 V 1010 mA 5.25 ms VIN=4.5V 2 µA Quiescent Supply Current (1 99IN=4.5V IOUT=0mA 350 µA Quiescent Supply Current (1 99IN=4.5V IOUT=725mA 5.25 mA VIN=4.5V IOUT=100mA (1 9 .377 23 . 55 ms RDS(ON) 800 UNITS Post Fault Output Load for Recovery (QDEOH 9 10 Post Fault Activation Turn On Time (QDEOH 9 1 SP619 will self recover when temperature drops below the trip point . 120 150 180 °C 90 120 135 °C .5 V 1.4 V Thermal Shutdown Die Temperature Thermal Restart Die Temperature (1$%/(/RJLF/2: (1$%/(3LQ/RJLF+,*+ Driver is disabled Driver is active .655 15 Turn On Delay RL N&L= 0.01µF (Note 2,3) 600 µs Turn Off Delay RL N&L= 0.01µF (Note 2,4) 200 µs Rise Time RL N&L= 0.01µF (Note 2) 100 µs Fall Time RL N&L= 0.01µF (Note 2) 2500 µs 1RWH7\SLFDOVDUH7J=25°C 1RWH&KDUDFWHUL]HGQRWWHVWHG 1RWH7XUQRQGHOD\LVPHDVXUHGIURPWKHWLPHWKHHQDEOHSLQLVWXUQHGRQWRWKHWLPHLWWDNHVWKHRXWSXWWRULVHWRRILWV ¿QDOYDOXH 1RWH7XUQRIIGHOD\LVPHDVXUHGIURPWKHWLPHWKHHQDEOHSLQLVWXUQHGWRWKHWLPHLWWDNHVIRUWKHRXWSXWWRIDOOWRRILWV current value. April 2008 Rev L SP619 High Current Power Switch 2 © 2008 EXAR Corporation FAULT AND RECOVERY TRUTH TABLE* Enable Load Temperature (TJ) Previous State Switch Current State/Fault (Note*) Low X X X Open Off High < 800 mA < 163ºC Off Closed Normal High < 800 mA > 163ºC Off Open Thermal Cutoff High > 800 mA < 163ºC Off Open Overcurrent High > 800 mA > 163ºC Off Open Thermal Cutoff, Overcurrent High N < 163ºC Overcurrent Open Load Condition High N > 163ºC Overcurrent Open Thermal Cutoff, Overcurrent, Load Condition High !N < 163ºC Overcurrent Closed Normal High !N > 163ºC Overcurrent Open Thermal Cutoff High N < 120ºC Thermal Cutoff Open Load Condition High N > 120ºC Thermal Cutoff Open Load Condition, Thermal Cutoff High !N < 120ºC Thermal Cutoff Closed Normal High !N > 120ºC Thermal Cutoff Open Thermal Cutoff 1RWH7KLVWDEOHLVIRUIDXOWFRQGLWLRQVQRWIRUFRQWLQXRXVRSHUDWLRQHOVHGDPDJHWRWKHGHYLFHPD\ occur. In order to recover to the normal state after a Thermal Cutoff fault, the part’s junction temperDWXUHPXVWGHFUHDVHEHORZ&DQGWKHORDGRQLWVRXWSXWPXVWEHJUHDWHUWKDQN PIN ASSIGNMENTS PIN NUMBER PIN NAME FUNCTION 1 VIN Input power supply pin (4.5V to 5.5V) 2 *1' *URXQGFRQQHFWLRQ 3 (QDEOH A logic high turns on the switch 4 NC No connect 5 NC No connect 6 VOUT Switch output April 2008 Rev L SP619 High Current Power Switch 3 © 2008 EXAR Corporation THEORY OF OPERATIION The SP619 is a switch capable of handling up to 800mA of current. inrush current that can be encountered. At 6 volts in, the inrush current was about 250mA into a 100µF capacitor. The SP619 is targeted as a for 5V USB protection power distribution switch. And can be used in general power distribution applications where short circuits are likely to be encountered. Output Voltage Rise Time The output voltage of the SP619 has an output capacitance dependency on the slope of VOUT. A simple RC circuit is created when the switch is turned on. (TXDWLRQ -t V(t)=VO+VIN RDS(ON) • COUT 1-e Short circuit operation When the SP619 enters a short circuit condition, the switch is disabled. The output of the SP619 will not restart until the outSXWLPSHGDQFHLVJUHDWHUWKDQ.7KH enable pin can be used to re-enable the SP619 into any load condition that is not a fault condition. Refer to the truth table on page 4 for more information on the different SP619 switch states. The typical deactivation time is about 2ms. ( ( 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 100µF output capacitance ZHJHWDERXWQVGHOD\LQ¿JXUH 4.17 Enable The enable pin allows easy control of the SP619. 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 PRUHWKDQ9GXHWRDQLQWHUQDO(6'GLode. Doing so will affect the operation of the SP619 and could damage the device. ,QDW\SLFDODSSOLFDWLRQDQ.UHVLVWRUWR *1' VKRXOG EH XVHG RQ WKH HQDEOH SLQ This resistor will pull the enable low when an enable signal is not present. This prevents the SP619 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. 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 YDOXHLQ¿JXUH Inrush Current The SP619 is a simple resistive switch. When the switch is turned on into a highly FDSDFLWLYHORDGWKHUHFRXOGEHDVLJQL¿FDQW April 2008 Rev L SP619 High Current Power Switch 4 © 2008 EXAR Corporation THEORY OF OPERATION Overtemperature Protection The SP619 has built-in overtemperature protection to protect the part against damage if the die temperature gets too hot. The typical thermal cutoff is about 150ºC. The part will self recover if the temperature drops below the thermal restart threshold of about 120ºC. Layout Considerations The input and output decoupling capacitors should be placed as close as possible to the LQSXWDQGRXWSXWSLQV7KH*1'SLQVKRXOG EH VWLWFKHG WR WKH *1' SODLQ WR KHOS ZLWK thermal performance. The input and output traces should be as large as possible. The .LVDOVRUHFRPPHQGHGLQWKHGHVLJQ and should be placed close to the output decoupling cap. Vin 146-6642-00 U1 Vout ON/OFF GND Solved by TM SP619 Recommended Layout April 2008 Rev L SP619 High Current Power Switch 5 © 2008 EXAR Corporation 6 PIN SOT-23 April 2008 Rev L SP619 High Current Power Switch 6 © 2008 EXAR Corporation ORDERING INFORMATION Part number Temperature range Package Type 63(./ From -10 to +85ºC Lead Free 6 pin SOT23 63(./75 From -10 to +85ºC Lead Free 6 pin SOT23 /TR = Tape and Reel. For further assistance: Email: [email protected] EXAR Technical Documentation: http://www.exar.com/TechDoc/default.aspx? Exar CorporationHeadquarters and Sales Office 48720 Kato Road Fremont, CA 94538 main: 510-668-7000 fax: 510-668-7030 EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. April 2008 Rev L SP619 High Current Power Switch 7 © 2008 EXAR Corporation