MIC2583-LBQS Micrel Inc, MIC2583-LBQS Datasheet - Page 3

• Manufacturer Part Number: MIC2583-LBQS
• Description: IC,Power Control/Management,CMOS,SSOP,16PIN,PLASTIC
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2583-LBQS

• Applications: General Purpose
• Internal Switch(s): No
• Voltage - Supply: 2.3 V ~ 13.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Pin Description
Micrel, Inc.
April 2009
Pin Number
8-Pin SOIC
1
2
3
4
5
6
7
8
16-Pin QSOP
Pin Number
7, 8
12
14
15
16
1
3
4
Pin Name
SENSE
CPOR
GATE
/POR
GND
VCC
ON
FB
Pin Name
Power-On Reset Output: Open drain N-channel device, Active Low. This pin
remains asserted during start-up until a time period (t
voltage rises above the power-good threshold (VFB). The timing capacitor C
determines t
V
requires a pull-up resistor (10kΩ minimum) to VCC.
ON Input: Active High. The ON pin, an input to a Schmitt-triggered comparator
used to enable/disable the controller, is compared to a 1.24V reference with
50mV of hysteresis. When a logic high is applied to the ON pin (V
start-up sequence begins when the GATE pin starts ramping up towards its final
operating voltage. When the ON pin receives a logic low signal (V
the GATE pin is grounded and /FAULT remains high if VCC is above the UVLO
threshold. ON must be low for 20µs in order to initiate a start-up sequence.
Additionally, toggling the ON pin LOW to HIGH resets the circuit breaker.
Power-On Reset Timer: A capacitor connected between this pin and ground sets
the supply contact start-up delay (t
When VCC rises above the UVLO threshold, the capacitor connected to C
begins to charge. When the voltage at CPOR crosses 0.3V, the start-up
threshold (V
is immediately discharged to ground. When the voltage at FB rises above V
capacitor C
the power-on reset delay threshold (V
ground, and /POR is de-asserted. If C
20µs.
Ground Connection: Tie to analog ground.
Power-Good Threshold Input (Under-voltage Detect): This input is internally
compared to a 1.24V reference with 30mV of hysteresis. An external resistive
divider may be used to set the voltage at this pin. If this input momentarily goes
below 1.24V, then /POR is activated for one timing cycle, t
output under-voltage condition. The /POR signal de-asserts one timing cycle
after the FB pin exceeds the power-good threshold by 30mV. A 5µs filter on this
pin prevents glitches from inadvertently activating this signal.
Gate Drive Output: Connects to the gate of an external N-channel MOSFET. An
internal clamp ensures that no more than 9V is applied between the GATE pin
and the source of the external MOSFET. The GATE pin is immediately brought
low when either the circuit breaker trips or an under-voltage lockout condition
occurs.
Circuit Breaker Sense Input: A resistor between this pin and VCC sets the
current limit threshold. Whenever the voltage across the sense resistor exceeds
the slow trip current limit threshold (V
ensure a constant load current. If V
time period t
immediately pulled low. If the voltage across the sense resistor exceeds the fast
trip circuit breaker threshold, V
power supply faults, then the GATE pin is immediately brought low without delay.
To disable the circuit breaker, the SENSE and VCC pins can be tied together.
The default V
available: 150mV, 200mV, or OFF (V
availability of other options.
Positive Supply Input: 2.3V to 13.2V. The GATE pin is held low by an internal
under-voltage lockout circuit until VCC exceeds a threshold of 2.2V. If VCC
exceeds 13.2V, an internal shunt regulator protects the chip from transient
voltages up to 20V at the VCC and SENSE pins.
FB
, /POR is asserted for a minimum of one timing cycle (t
POR
START
POR
OCSLOW
TRIPFAST
begins to charge again. When the voltage at CPOR rises above
. When the output voltage monitored at the FB pin falls below
3
), a start cycle is initiated if ON is asserted while capacitor C
, then the circuit breaker is tripped and the GATE pin is
for either device is 100mV. Other fast trip thresholds are
TRIPFAST
START
TRIPSLOW
TRIPFAST
TRIPSLOW
TH
POR
, at any point due to fast, high amplitude
) and the power-on reset interval (t
), the timer resets by pulling CPOR to
is left open, then t
(50mV) is exceeded for longer than
), the GATE voltage is adjusted to
disabled). Please contact factory for
POR
) after the FB pin
POR
POR
START
MIC2582/MIC2583
). The /POR pin
, indicating an
M9999-043009-C
defaults to
ON
ON
> 1.24V), a
< 1.19V),
POR
POR
FB
POR
POR
).
,