MIC2594 MICREL [Micrel Semiconductor], MIC2594 Datasheet - Page 3

• Manufacturer Part Number: MIC2594
• Description: Single-Channel, Negative High-Voltage Hot Swap Power Controllers
• Manufacturer: MICREL [Micrel Semiconductor]

Pin Description
December 2003
MIC2588/MIC2594
Pin Number
1
1
1
2
2
3
3
4
5
6
7
8
Turn-On Threshold
Turn-Off Threshold
MIC25XX-1
Active-High
MIC25XX-2
Active-Low
Pin Name
Threshold
Threshold
/PWRGD
/PWRGD
PWRGD
PWRGD
SENSE
DRAIN
GATE
VDD
OFF
VEE
ON
OV
UV
Pin Function
Power-Good Output: Open-drain. Asserted when the voltage on the DRAIN
pin (V
within proper specifications.
MIC2588-1 and MIC2594-1: PWRGD will be high-impedance when
V
greater than V
MIC2588-2 and MIC2594-2: /PWRGD will pull-down to V
V
greater than V
MIC2588: Overvoltage Threshold Input. When the voltage at the OV pin is
greater than the V
internal 100 A current pull-down.
MIC2594: Turn-On Threshold. At initial system power-up or after the device
has been shut off by the OFF pin, the voltage on the ON pin must exceed
the V
MIC2588: Undervoltage Threshold Input. When the voltage at the UV pin is
less than the V
internal 100 A current pull-down. The UV pin is also used to cycle the device
off and on to reset the circuit breaker. Taken together, the OV and UV pins
form a window comparator which defines the limits of V
load may safely be powered.
MIC2594: Turn-Off Threshold. When the voltage at the OFF pin is less than
the V
100 A current pull-down. The OFF pin is also used to cycle the device off and
on to reset the circuit breaker. Taken together, the ON and OFF pins provide
programmable hysteresis for the turn-on command voltage.
Negative Supply Voltage Input.
Circuit Breaker Sense Input: The current-limit threshold is set by connecting
a resistor between this pin and V
IR = 50mV is exceeded for an internal delay t
is tripped and the GATE pin is immediately pulled low. Toggling UV or OV
will reset the circuit breaker. To disable the circuit breaker, externally
connect SENSE and VEE together.
Gate Drive Output: Connect to the gate of an external N-Channel MOSFET.
Drain Sense Input: Connect to the drain of an external N-Channel MOSFET.
Positive Supply Input.
DRAIN
DRAIN
ONH
OFFL
DRAIN
is less than V
is less than V
threshold in order for the MIC2594 to be enabled.
threshold, the GATE pin is immediately pulled low by an internal
3
) is within V
PGTH
PGTH
UVL
OVH
threshold, the GATE pin is immediately pulled low by an
. Asserted State: Open-Drain.
. Asserted State: Active-Low.
threshold, the GATE pin is immediately pulled low by an
PGTH
PGTH,
PGTH
, and will pull-down to V
and will be high impedance when V
of VEE, indicating that the output voltage is
EE
. When the current-limit threshold of
FLT
(400 s), the circuit breaker
DRAIN
EE
when V
DRAIN
within which the
DRAIN
when
DRAIN
M9999-122303
is
is
Micrel