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Aug24-17 Rev M SP619 High Current Power Switch
DESCRIPTION
FEATURES
APPLICATIONS
SP619
High Current Power Switch
• Max R() .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
• Ultra low cost handsets
• PDA, DSC, MP3 players
• Cell phones
• Power Distribution Switch
• Battery-Charger Circuit
The SP619 is a low RDS(ON) high current switch designed with precision cur rent lim-
iting to protect connected devices from damage due to a short circuit con dition 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.
6 5 4
1 2 3
SP619
SOT23-6
TYPICAL APPLICATION CIRCUIT
Vin Vin
Cin .1µF
EN
80K
ON/OFF
GND
SP619
Vout
100K Cout
.1µF
LOAD
Aug24-17 Rev M SP619 High Current Power Switch
2
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
= 4.5V - 5.5V, C = 0.1µF, T = -10°C to + 85°C
These are stress ratings only and functional op-
eration of the device at these ratings or any other
above those indicated in the operation sections of
absolute maximum rating conditions for extended
CONDITIONS MIN TYP (Note 1) MAX UNITS
Operating Input Voltage
Range
4.5 5.5 V
Overcurrent Deactivation
Range
620 800 1010 mA
Overcurrent Duration Be-
fore Deactivation
1 5.25 ms
Shutdown Supply Current V=4.5V 2 µA
Quiescent Supply Current =4.5V
I=0mA
350 µA
Quiescent Supply Current =4.5V
I=725mA
5.25 mA
R V=4.5V I=100mA
.377
Post Fault Output Load for
Recovery
10 15 23
Post Fault Activation Turn
On Time
1 55 ms
Thermal Shutdown Die
Temperature
SP619 will self recover
when temperature drops
below the trip point .
120 150 180 °C
Thermal Restart Die Tem-
perature
90 120 135 °C
Driver is disabled .5 V
Driver is active .655 1.4 V
Turn On Delay R= 0.01µF
(Note 2,3)
600 µs
R= 0.01µF
(Note 2,4)
200 µs
Rise Time R= 0.01µF
(Note 2)
100 µs
Fall Time R= 0.01µF
(Note 2)
2500 µs
V……….…………………………….….…-0.3V to 7V
Storage Temperature..…....……….… -65°C to 150°C
Junction Temperature..................... ……..…….150°C
Lead Temperature (Soldering, 10 sec)......…….300°C
Machine Model…………………………………....200V
Thermal resistance SOT23-6
Junction to Ambient……………………….….….191°C
Junction to lead ……………………...……………50°C
°C
current value.
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Aug24-17 Rev M SP619 High Current Power Switch
FAULT AND RECOVERY TRUTH TABLE*
Enable Load Temperature
(TJ)
Previous
State
Switch Current State/Fault
(Note*)
Low X X X Open
< 800 mA < 163ºC Closed Normal
< 800 mA > 163ºC Open
> 800 mA < 163ºC Open Overcurrent
> 800 mA > 163ºC Open
Overcurrent
< 163ºC Overcurrent Open Load Condition
> 163ºC Overcurrent Open
Overcurrent, Load
Condition
< 163ºC Overcurrent Closed Normal
> 163ºC Overcurrent Open
< 120ºC Open Load Condition
> 120ºC Open Load Condition,
< 120ºC Closed Normal
> 120ºC Open
-
PIN ASSIGNMENTS
PIN
NUMBER
PIN
NAME
FUNCTION
1 V Input power supply pin (4.5V to 5.5V)
2
3 A logic high turns on the switch
4 NC No connect
5 NC No connect
6 V Switch output
Aug24-17 Rev M SP619 High Current Power Switch
4
THEORY OF OPERATION
The SP619 is a switch capable of handling
up to 800mA of current.
The SP619 is targeted as a 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
-
dition, the switch is disabled. The output
of the SP619 will not restart until the out-
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
SP619 switch states. The typical deactiva-
tion time is about 2ms.
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 in-
put voltage by more than 0.1V due to an
operation of the SP619 and could damage
enable pin. This resistor will pull the enable
low when an enable signal is not present.
This prevents the SP619 from falsely turn-
ing 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.
inrush current that can be encountered.
At 6 volts in, the inrush current was about
250mA into a 100µF capacitor.
Output Voltage Rise Time
The output voltage of the SP619 has an
output capacitance dependency on the
slope of V. A simple RC circuit is creat-
ed when the switch is turned on.
V(t)=V+V
(
(
R • C
-t
is initial Voltage condition typi-
cally 0V
V is the input voltage
R is the switch resistance
C is the output capacitance
For 4.2V V and 100µF output capacitance
4.17
3.33
2.5
1.67
0.83
000.33 0.67 11.33 1.67 2
time in uS
VOUT
This is comparable to actual measured
1-e
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Aug24-17 Rev M SP619 High Current Power Switch
Overtemperature Protection
The SP619 has built-in overtemperature
protection to protect the part against dam-
age if the die temperature gets too hot. 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
thermal performance. The input and output
traces should be as large as possible. The
and should be placed close to the output de-
coupling cap.
THEORY OF OPERATION
146-6642-00
Vin
GND
ON/OFF
Vout
U1
SP619
Solved by
TM
Recommended Layout
Aug24-17 Rev M SP619 High Current Power Switch
6
6 PIN SOT-23
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Aug24-17 Rev M SP619 High Current Power Switch
ORDERING INFORMATION(1)
Part number Operating
Temperature
Range
Lead-Free Package
Type
Packaging Method
(3) -10 to +85ºC
Yes(2) 6 pin SOT23
Tape and Reel
-10 to +85ºC Tape and Reel
(reverse orientation)
NOTE:
1. Refer to www.exar.com/SP619 for most up-to-date Ordering Information
2. Visit www.exar.com for additional information on Environmental Rating.
3. NRND - Not recommended for new designs.
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