MIC2588_05 Datasheet, PDF (3/21 Pages) Micrel Semiconductor – Single-Channel, Negative High-Voltage Hot Swap Power Controllers

MIC2588/MIC2594
Pin Description
Pin Number
1
1
1
2
2
3
3
4
5
6
7
8
Pin Name
PWRGD
/PWRGD
MIC25XX-1
PWRGD
Active-High
MIC25XX-2
/PWRGD
Active-Low
OV
Threshold
ON
Turn-On Threshold
UV
Threshold
OFF
Turn-Off Threshold
VEE
SENSE
GATE
DRAIN
VDD
Micrel
Pin Function
Power-Good Output: Open-drain. Asserted when the voltage on the DRAIN
pin (V_DRAIN) is within V_PGTH of VEE, indicating that the output voltage is
within proper specifications.
MIC2588-1 and MIC2594-1: PWRGD will be high-impedance when
V_DRAIN is less than V_PGTH, and will pull-down to V_DRAIN when V_DRAIN is
greater than V_PGTH. Asserted State: Open-Drain.
MIC2588-2 and MIC2594-2: /PWRGD will pull-down to V_DRAIN when
V_DRAIN is less than V_PGTH, and will be high impedance when V_DRAIN is
greater than V_PGTH. Asserted State: Active-Low.
MIC2588: Overvoltage Threshold Input. When the voltage at the OV pin is
greater than the V_OVH threshold, the GATE pin is immediately pulled low by
an internal 100µA 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_ONH threshold in order for the MIC2594 to be enabled.
MIC2588: Undervoltage Threshold Input. When the voltage at the UV pin is
less than the V_UVL 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 which defines the limits of V_EE within which the
load may safely be powered.
MIC2594: Turn-Off Threshold. When the voltage at the OFF pin is less than
the V_OFFL 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 turn-on command voltage.
Negative Supply Voltage Input. Connect to the negative, or low side, terminal
of the input power supply.
Circuit Breaker Sense Input: The current-limit threshold is set by connecting
a resistor between this pin and V_EE. When the current-limit threshold of
IR = 50mV is exceeded for an internal delay t_FLT (400µs), the circuit breaker
is tripped and the GATE pin is immediately pulled low by I_GATEOFF. Toggling
the UV/OFF pin 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. Connect to the positive, or high side, terminal of the
input power supply.
September 2005
3
M9999-083005