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SP619
High Current Power Switch
FEATURES
* 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 * 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
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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 2A. TYPICAL APPLICATION CIRCUIT
Vin
SP619
Vin Vout
Cin .1F
100K
Cout .1F
LOAD
EN ON/OFF 80K GND
April 2008 Rev L
SP619 High Current Power Switch
(c) 2008 EXAR Corporation
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ABSOLUTE MAXIMUM RATINGS
VIN...................................................-0.3V to 7V
These are stress ratings only and functional op- Storage Temperature...................... -65C to 150C eration of the device at these ratings or any other Junction Temperature..................... ...............150C above those indicated in the operation sections of Lead Temperature (Soldering, 10 sec).............300C absolute maximum rating conditions for extended Human Body Model...................................2000V Machine Model...........................................200V periods of time may affect reliability.
Thermal resistance SOT23-6 Junction to Ambient....................................191C Junction to lead ..........................................50C
RECOMMENDED OPERATING CONDITIONS
IN
= 4.5V - 5.5V, CIN = 0.1F, TA = -10C to + 85C CONDITIONS MIN 4.5 620 1 VIN=4.5V
IN=4.5V
TYP (Note 1)
MAX 5.5
UNITS V mA ms A A mA
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 Driver is disabled Driver is active Turn On Delay Turn Off Delay Rise Time Fall Time
J=25C
800
1010 5.25 2 350 5.25 .377
IOUT=0mA
IN=4.5V
IOUT=725mA VIN=4.5V IOUT=100mA 10 1 SP619 will self recover when temperature drops below the trip point . 120 150 15
23 55 180 ms C
90
120
135 .5
C V V s s s s
.655
1.4 600 200 100 2500
RL RL RL RL
L= 0.01F (Note 2,3) L= 0.01F (Note 2,4) L=
0.01F 0.01F
(Note 2)
L=
(Note 2)
current value.
April 2008 Rev L SP619 High Current Power Switch (c) 2008 EXAR 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 Temperature (TJ) X < 163C > 163C < 163C > 163C < 163C > 163C 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
< 163C > 163C < 120C > 120C < 120C > 120C
Overcurrent Overcurrent Thermal Cutoff Thermal Cutoff Thermal Cutoff Thermal Cutoff
Closed Open Open Open Closed Open
occur. In order to recover to the normal state after a Thermal Cutoff fault, the part's junction temper-
PIN ASSIGNMENTS
PIN NUMBER 1 2 3 4 5 6 NC NC VOUT A logic high turns on the switch No connect No connect Switch output PIN NAME VIN FUNCTION Input power supply pin (4.5V to 5.5V)
April 2008 Rev L
SP619 High Current Power Switch
(c) 2008 EXAR Corporation
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THEORY OF OPERATIION The SP619 is a switch capable of handling up to 800mA of current. 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. 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 outenable 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. inrush current that can be encountered. At 6 volts in, the inrush current was about 250mA into a 100F capacitor. 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. V(t)=VO+VIN
(
-t 1-e
RDS(ON) * COUT
(
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 100F output capacitance
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 ode. Doing so will affect the operation of the SP619 and could damage the device.
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 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. Inrush Current The SP619 is a simple resistive switch. When the switch is turned on into a highly
April 2008 Rev L
SP619 High Current Power Switch
(c) 2008 EXAR Corporation
4
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 150C. The part will self recover if the temperature drops below the thermal restart threshold of about 120C. Layout Considerations The input and output decoupling capacitors should be placed as close as possible to the
thermal performance. The input and output traces should be as large as possible. The and should be placed close to the output decoupling cap.
Vin
146-6642-00
U1 Vout
ON/OFF
Solved by
GND
TM
SP619
Recommended Layout
April 2008 Rev L
SP619 High Current Power Switch
(c) 2008 EXAR Corporation
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6 PIN SOT-23
April 2008 Rev L
SP619 High Current Power Switch
(c) 2008 EXAR Corporation
6
ORDERING INFORMATION Part number Temperature range From -10 to +85C From -10 to +85C /TR = Tape and Reel. Package Type Lead Free 6 pin SOT23 Lead Free 6 pin SOT23
For further assistance: Email: customersupport@exar.com 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
(c) 2008 EXAR Corporation
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