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APL5537CKCTI-TRG Datasheet(PDF) 9 Page - Anpec Electronics Coropration

Part # APL5537CKCTI-TRG
Description  Dual Channel 300mA Low Dropout Linear Regulator
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APL5537CKCTI-TRG Datasheet(HTML) 9 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.7 - Oct., 2011
www.anpec.com.tw
9
APL5537
Function Description
VIN Under-Voltage Lockout (UVLO)
The APL5537 has a built-in under-voltage lockout circuit
to keep the outputs shuting off until internal circuitry is
operating properly. The UVLO circuit has a hysteresis
and a de-glitch feature so that it will typically ignore un-
dershoot transients on the input
.
Soft-Start (For Each Channel)
The APL5537 provides an internal soft-start circuitry to
control rise rate of the output voltage and limit the current
surge during start-up. The output voltage starts the soft-
start at approximate 60
µs after the VIN is over the UVLO
threshold. The typical soft-start interval is about 60
µs.
Current-Limit Protection (For Each Channel)
The APL5537 provides a current-limit protection function.
During current limit, the device limits output current at
current limit threshold. For reliable operation, the device
should not be operated in current limit for extended period.
Short-Circuit Current-Limit Protection (For Each
Channel)
When the output voltage drops below 0.8V, which is
caused by the over load or short circuit, the device limits
the output current down to a safe level. The short circuit
current limit is used to reduce the power dissipation dur-
ing short circuit conditions. If the junction temperature is
over the over-temperature threshold, the device will enter
the thermal shutdown.
Enable/Disable (For Each Channel)
Pulling the V
EN1/2 above 1.5V enables the respective LDO
output, and pulling V
EN1/2 below 0.4V disables the respec-
tive LDO output. When both the LDO outputs are disabled,
the supply current is reduced to less than 1
µA. EN1/2
pins are internally pulled low by resistors. If shutdown
function is not used, connect EN1/2 to VIN for normal
operation. The enable inputs are compatible with both
TTL and CMOS logic levels.
Over-Temperature Protection
An over-temperature protection circuitry limits the junc-
tion temperature of APL5537. When the junction tempera-
ture exceeds +160oC, the over-temperature protection
circuitry disables the LDO outputs, allowing the device to
cool down. The LDO outputs are enabled again after the
junction temperature cools down by 40oC, resulting in a
pulsed output during continuous thermal overload
conditions. Over-temperature protection is designed to
protect the IC in the event of over temperature conditions.
For reliable operation, the junction temperature cannot
exceed T
J=+125
oC


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