MIC2589 Micrel Semiconductor, MIC2589 Datasheet - Page 3

• Manufacturer Part Number: MIC2589
• Description: (MIC2589 / MIC2595) SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS
• Manufacturer: Micrel Semiconductor

Pin Description
March 2004
MIC2589/2595
Pin Number
10
11
1
2
3
3
4
4
5
6
7
8
9
(Turn-Off Threshold)
(Turn-On Threshold)
(MIC25XX-1)
(MIC25XX-2)
Active-High
Active-Low
/PWRGD1
Pin Name
PGTIMER
PWRGD1
Threshold
Threshold
CFILTER
SENSE
DRAIN
CNLD
GATE
OFF
VEE
ON
UV
OV
NC
Pin Function
Power-Good Output 1: Asserted when the voltage on the DRAIN pin
(V
proper specifications. For the MIC2589-1 and MIC2985-1, PWRGD1 will be
high impedance when V
V
MIC2595-2, /PWRGD1 will pull-down to V
V
A capacitor connected from this pin to VEE sets the time interval between
assertions of PWRGD2 (or /PWRGD2) and PWRGD3 (or /PWRGD3)
relative to PWRGD1 (or /PWRGD1). See the “Functional Description” for
further detail.
MIC2589 and MIC2589R: Undervoltage Threshold Input. When the voltage
at the UV pin is less than the V
pulled low by an 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 define the limits of
V
MIC2595 and MIC2595R: Turn-Off Threshold. When the voltage at the OFF
pin is less than the V
low by an internal 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 MIC2595 to be
enabled.
MIC2589 and MIC2589R: Overvoltage Threshold Input. When the voltage
at the OV pin is greater than the V
pulled low by an internal 100 A current pull-down.
MIC2595 and MIC2595R: Turn-On Threshold. At initial system power-up or
after the part has been shut off by the OFF pin, the voltage on the ON pin
must be above the V
Current Limit Response Timer: A capacitor connected between this pin and
VEE provides filtering against nuisance tripping of the circuit breaker by
setting a time delay, t
signaling a fault condition and latching the output off. The minimum time for
t
during start-up. This pin is held to VEE with a 3 A current pull-down when
no current limit condition exists. See the “Functional Description” for further
details.
No-Load Detect Timer: A capacitor between this pin and VEE sets the
interval, t
below 10% of full-scale current limit before the circuit breaker is tripped.
Tying this pin to V
internal NMOS when there is no undercurrent condition.
Negative Supply Voltage Input.
No Internal Connection.
Circuit Breaker Sense Input: A resistor between this pin and VEE sets the
current limit trip point for the circuit. When the current limit threshold of IR =
50mV is exceeded for t
immediately pulled low. Toggling UV or OV will reset the circuit breaker. To
disable the circuit breaker, externally tie SENSE and VEE can be connected
together.
Gate Drive Output: Connects to the Gate of an N-Channel MOSFET.
Drain Sense Input: Connects to the Drain of an N-Channel MOSFET.
FLT
DRAIN
PGTH
EE
DRAIN
within which the load may safely be powered.
will be the time it takes for the output (capacitance) to charge to V
, and will be high-impedance when V
when V
) is within V
NLD
3
, for which the current through the external MOSFET can drop
DRAIN
EE
PGTH
OFFL
ONH
will disable this function. This pin is held to VEE by an
FLT
is greater than V
FLT
DRAIN
, for which an overcurrent event must last prior to
of VEE, indicating that the output voltage is within
threshold in order for the MIC2595 to be enabled.
threshold, the GATE pin is immediately pulled
, the circuit breaker is tripped and the GATE pin is
is less than V
UVL
OVH
threshold, the GATE pin is immediately
threshold, the GATE pin is immediately
PGTH
DRAIN
DRAIN
PGTH
. For the MIC2589-2 and
when V
, and will pull-down to
is greater than V
DRAIN
is less than
M9999-031504
PGTH
EE
.
Micrel