MIC2587-1BM TR Micrel Inc, MIC2587-1BM TR Datasheet - Page 4

• Manufacturer Part Number: MIC2587-1BM TR
• Description: IC CTRLR HOT SWAP POS HV 8-SOIC
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2587-1BM 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: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MIC2587-1BMTR; MIC2587-1BMTR

Pin Description
Micrel
October 2004
Pin Number
6
7
8
Pin Name
SENSE
GATE
VCC
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
range. When the ON pin voltage is higher than the V
(I
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
TIMER pin charges. If the current limit condition goes away before the TIMER pin voltage
rises above the V
The GATE output pin is shut down whenever: (1) the input supply voltage is lower than the
V
voltage is higher than the V
SENSE pins is greater than V
overcurrent fault conditions – the GATE is immediately pulled to ground by I
(minimum) pull-down current.
Circuit Breaker Sense Input: This pin is the (-) Kelvin sense connection for the output
supply rail. A low-valued resistor (R
breaker’s current limit trip point. When the current limit detector circuit is enabled (as well as
the current limit timer), while the FB pin voltage remains higher than 1V, the voltage across
the sense resistor (V
constant current into the load. When the FB pin voltage is less than ≅0.5V, the voltage
across the sense resistor decreases linearly to a minimum of 12mV (typical) when the FB
pin voltage is at 0V.
To disable the circuit breaker (and defeat all current limit protections), the SENSE pin and
the VCC pin can be tied together.
Positive Supply Voltage Input: This pin is the (+) Kelvin sense connection for the output
supply rail. The nominal operating voltage range for the MIC2587 and the MIC2587R is
+10V to +80V, and VCC can withstand input transients up to +100V. An undervoltage
lockout circuit holds the GATE pin low whenever the supply voltage to the MIC2587 and the
MIC2587R is less than the V
GATEON
UVL
threshold, (2) the ON pin voltage is lower than the V
) charges the GATE pin.
TIMERH
CC
threshold, then steady-state operation resumes.
-V
SENSE
GATE
UVH
4
TIMERH
TRIP
= V
) will be regulated to V
threshold.
while the TIMER pin is grounded. For cases (3) and (4) –
GATE
threshold, or (4) the difference between the VCC and
SENSE
Pin Function
- V
) between this pin and the VCC pin sets the circuit
CC
) of +7.5V over the input supply’s full operating
TRIP
ONH
TRIP
while the capacitor connected to the
threshold, a 16µA current source
ONL
(47mV, typically) to maintain a
threshold, (3) the TIMER pin
MIC2587/MIC2587R
GATEFLT
, a 30mA
[phone]
M9999-102204