MIC2595-2BM Micrel Inc, MIC2595-2BM Datasheet - Page 4

• Manufacturer Part Number: MIC2595-2BM
• Description: IC CTRLR HOT SWAP NEG HV 14-SOIC
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2595-2BM

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: -19 V ~ -80 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

December 2005
Pin Description
Pin Number
10
11
1
2
3
3
4
4
5
6
7
8
9
(MIC25XX-1)
(MIC25XX-2)
Active High
MIC2589R)
MIC2595R)
MIC2589R)
MIC2595R)
Active Low
/PWRGD1
Pin Name
PGTIMER
PWRGD1
(MIC2589
(MIC2595
(MIC2589
(MIC2595
CFILTER
SENSE
DRAIN
CNLD
GATE
OFF
VEE
and
and
and
and
ON
UV
OV
NC
Pin Function
Power-Good Output 1: Asserted when the voltage on the DRAIN pin (V
V
the MIC2589-1 and MIC2595-1, PWRGD1 will be high impedance when V
less than V
the MIC2589-2 and MIC2595-2, /PWRGD1 will pull-down to V
less than 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.
Undervoltage Threshold Input: When the voltage at the UV pin is less than the V
threshold, the GATE pin is immediately pulled low by an internal 100µA 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 that defines
the limits of V
Turn-Off Threshold: When the voltage at the OFF pin is less than the V
threshold, the GATE pin is immediately pulled low by an internal 100µA 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.
Overvoltage Threshold Input: When the voltage at the OV pin is greater than the
V
pull-down.
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
the MIC2595 to be enabled.
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
and latching the output off. The minimum time for t
output (capacitance) to charge to VEE during start-up. This pin is held to VEE with a
3µA current pull-down when no current limit condition exists. See the “Functional
Description” for further details.
No-Load Detect Timer: The absence of a load for the MIC2589/MIC2589R is defined
for any current load that is less than 20% of the full-scale current limit (i.e., 0.20 ×
I
that is 80% (or greater) below the full-scale current limit before the circuit breaker is
tripped.
Negative Supply Voltage Input: Connect the negative, or low side, terminal of the
input power supply.
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
pulled low by I
disable the circuit breaker (i.e., eliminate overcurrent V
(short) the SENSE pin to VEE and also connect the CNLD pin to VEE to disable the
no-load detection feature.
Gate Drive Output: Connects to the Gate of an N-Channel MOSFET.
Drain Sense Input: Connects to the Drain of an N-Channel MOSFET.
LIM
PGTH
OVH
). A capacitor between CNLD and VEE sets the filter delay, t
threshold, the GATE pin is immediately pulled low by an internal 100µA current
of VEE, indicating that the output voltage is within proper specifications. For
FLT
, for which an overcurrent event must last prior to signaling a fault condition
PGTH
PGTH
EE
FLT
GATEOFF
, and will pull-down to V
, and will be high-impedance when V
to deliver power to the load.
, the circuit breaker is tripped and the GATE pin is immediately
. Toggling UV or OV will reset the circuit breaker. In order to
4
DRAIN
when V
FLT
DRAIN
DRAIN
will be the time it takes for the
SENSE
is greater than V
is greater than V
-V
ONH
DRAIN
EE
NLD
threshold in order for
protection), connect
when V
, for a load current
[phone]
M9999-120505
DRAIN
OFFL
PGTH
DRAIN
PGTH
DRAIN
) is within
. For
.
is
is
UVL