SC4250 데이터 시트보기 (PDF) - Semtech Corporation
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SC4250 Datasheet PDF : 12 Pages
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SC4250
POWER MANAGEMENT
Pin Configuration
TOP VIEW
PWRGD/PWRGD
1
8
OV
2
7
UV
3
6
VEE
4
5
(SO-8)
VCC
DRAIN
GATE
SENSE
Ordering Information
Part Number
Package (1)
SC4250HISTR
SC4250HISTRT(2)
SC4250LISTR
SO-8
SC4250LISTRT(2)
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) Lead free product. This product is fully WEEE and RoHS
compliant.
Pin Descriptions
Pin
Pin Name
Pin Function
1
PWRGD/PWRGD
Power Good output pin.
be connected directly to
This pin will toggle
the enable pin of a
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VofEVEEEis.
This pin can
optional.
2
OV
Analog Overvoltage input. When OV is pulled above the 1.223V threshold, an overvoltage
condition is detected and the GATE pin will be immediately pulled low. The GATE pin will
remain low until OV drops below the 1.188V high to low threshold.
3
UV
Analog Undervoltage input. When UV is pulled below the 1.223V threshold, an
undervoltage condition is detected and the GATE pin will be immediately pulled low. The
GATE pin will remain low until UV rises above the 1.273 threshold. The UV pin is also
used to reset the electronic circuit breaker in the "latch OFF" version. If the UV pin is
cycled low and high following the trip of the circuit breaker, the circuit breaker is reset and
a normal power-up sequence will occur.
4
VEE
Negative supply voltage input. Connect to the lower potential of the power supply.
5
SENSE
Circuit breaker sense pin. With a sense
and SENSE, the circuit breaker will trip
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60mV. Noise spikes of less than 2µs are filtered out and will not trip the circuit breaker. If
the circuit breaker trip current is set to twice the normal operating current, only 25mV is
dropped across the sense resistor during normal operation. To disable the circuit breaker,
VEE and SENSE can be shorted together.
6
GATE
Gate drive output for external N-channel. The GATE pin will go high when the following
start-up
60mV.
conditions
The GATE
are
pin
met: the
is pulled
UV pin
high by
is
a
high, the OV
50µA current
psionuirsceloawnadnpdu(llVedSENloSwE -wVitEhE)a<40mA
current source.
7
DRAIN
Analog Drain sense input. Connect this pin to the drain of the external N-channel FET
and the V(-) pin of the power module.
PWRGD pin will toggle.
When the DRAIN pin is below VPG, the PWRGD or
8
VCC
Positive supply voltage input. Connect this pin to the higher potential of the power supply
input and the V(+) pin of the power module
2005 Semtech Corp.
4
www.semtech.com
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