MIC2586-2BM TR Micrel Inc, MIC2586-2BM TR Datasheet - Page 4

• Manufacturer Part Number: MIC2586-2BM TR
• Description: IC CTRLR/SEQ HOT SWAP 14-SOIC
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2586-2BM TR

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 10 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
• Other names: MIC2586-2BMTR; MIC2586-2BMTR

Pin Description
Micrel
October 2004
Pin Number
10
11
7
9
(MIC2586R-1)
(MIC2586R-2)
(MIC2586-1)
(MIC2586-2)
Active-HIGH
Active-LOW
/PWRGD3
Pin Name
PGTIMER
PWRGD3
TIMER
GATE
Pin Function
Power-is-Good Delay Timer: A capacitor (C
sets a delay from PWRGD1 to PWRGD2 (t
PWRGD3 (t
after PWRGD1 has been asserted. The same description applies to the active-
LOW (-2) output signals.
Power-is-Good Output 3 (PWRGD3 or /PWRGD3), Open-drain Output: For the
(-1) option, this output signal is asserted when the following is true: PWRGD1 =
Asserted AND the PWRGD1-to-PWRGD3 delay (t
t
PGTIMER pin. Once PWRGD1 is asserted, an internal current source (I
begins to charge C
(typically, 1.25V), PWRGD3 is asserted. The same description above applies to
the (-2) option. For further information, refer to the PWRGD1 and PGTIMER pin
descriptions.
To use this signal as a logic control in low-voltage dc-dc conversion applications,
an external pull-up resistor between this pin and the logic supply voltage is
recommended, unless an internal pull-up impedance is provided by the dc-dc
module or other device (load).
Current Limit Response Timer: A capacitor connected from this pin to GND
provides overcurrent filtering to prevent nuisance “tripping” of the circuit breaker
by setting the time (t
limit. Once the MIC2586 circuit breaker trips, the output latches off. Under
normal (steady-state) operation, the TIMER pin is held to GND by an internal
3.5µA current source (I
resistor exceeds the V
activated to charge the capacitor connected to the TIMER pin. When the TIMER
pin voltage reaches the V
the GATE pin low, the I
capacitor is discharged by the I
TIMER pin is less than 0.5V, the MIC2586 can be restarted by toggling the ON
pin LOW then HIGH.
For the MIC2586R, the capacitor connected to the TIMER pin sets the period of
auto-retry where the duty cycle is fixed at a nominal 5%.
Gate Drive Output: This pin is the output of an internal charge pump connected
to the gate of an external, N-channel power MOSFET. The charge pump has
been designed to provide a minimum gate drive (∆V
over the input supply’s full operating range. When the ON pin voltage is higher
than the V
When in current limit, the output voltage at the GATE pin is adjusted so that the
voltage across the external sense resistor is held equal to V
capacitor connected to the TIMER pin charges. If the current limit condition goes
away before the TIMER pin voltage rises above the V
steady-state operation resumes.
The GATE output pin is shut down whenever: (1) the input supply voltage is
lower than the V
threshold, (3) the TIMER pin voltage is higher than the V
the difference between the VCC and SENSE pins is greater than V
TIMER pin is grounded. For cases (3) and (4) – overcurrent fault conditions –
the GATE is immediately pulled to ground by I
down current.
PG(1-3)
is the time delay programmed by the capacitor (C
ONH
PG(1-3)
threshold, a 16µA current source (I
). An internal current source (I
UVL
PG
. When the voltage on C
threshold, (2) the ON pin voltage is lower than the V
FLT
TRIP
TIMERDN
) for which the controller is allowed to remain in current
TIMERUP
4
threshold, an internal 65µA current source (I
TIMERH
). When the voltage across the external sense
TIMERDN
current source is disabled, and the TIMER pin
threshold, the circuit breaker is tripped pulling
current source. When the voltage at the
PG(1-2)
PG
PG
) connected from this pin to GND
GATEFLT
CPG
) and from PWRGD1 to
crosses the V
GATEON
PG(1-3)
) is used to charge C
GATE
, a 30mA (minimum) pull-
) has elapsed, where
) charges the GATE pin.
PG
= V
) connected to the
TIMERH
TIMERH
GATE
PG3
threshold, or (4)
threshold, then
- V
threshold
TRIP
TRIP
CC
) of +7.5V
TIMERUP
while the
PG
while the
CPG
MIC2586/MIC2586R
only
)
ONL
) is
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