MIC2582/MIC2583
Single-Channel Hot Swap Controllers
General Description
The MIC2582 and MIC2583 are single-channel positive
voltage hot swap controllers designed to allow the safe
insertion of boards into live system backplanes. The
MIC2582 and MIC2583 are available in 8-pin SOIC and
16-pin QSOP packages, respectively. Using a few external
components and by controlling the gate drive of an
external N-Channel MOSFET device, the MIC2582/83
provide inrush current limiting and output voltage slew rate
control in harsh, critical power supply environments.
Additionally, a circuit breaker function will latch the output
MOSFET off if the current-limit threshold is exceeded for a
determined period. The MIC2583R option includes an
auto-restart function upon detecting an over current
condition.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
MIC2582: Pin-for-pin functional equivalent to the
LTC1422
2.3V to 13.2V supply voltage operation
Surge voltage protection up to 20V
Current regulation limits inrush current regardless of
load capacitance
Programmable inrush current limiting
Electronic circuit breaker
Optional dual-level overcurrent threshold detects
excessive load faults
Fast response to short-circuit conditions (<1µs)
Programmable output under-voltage detection
Undervoltage Lockout (UVLO) protection
Auto-restart function (MIC2583R)
Power-on-Reset (POR) status output
Power good (PG) status output (MIC2583 and
MIC2583R)
/FAULT status output (MIC2583 and MIC2583R)
Applications
RAID systems
Base stations
PC board hot swap insertion and removal
+12V backplanes
Network switches
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
May 23, 2014
Revision 5.0
Micrel, Inc.
MIC2582/MIC5283
Ordering Information
Part Number
MIC2582-xYM
Fast Circuit Breaker Threshold
x = J, 100mV
x = J1, Off
x = M, Off
x = J, 100mV
(1)
x = K , 150mV
(1)
x = L , 200mV
(1)
x = M , Off
x = J, 100mV
(1)
x = K , 150mV
(1)
x = L , 200mV
(1)
x = M , Off
Circuit Breaker
Latched off
Package
8-pin SOIC
MIC2583-xYQS
Latched off
16-pin QSOP
MIC2583R-xYQS
Auto-retry
16-pin QSOP
Note:
1. Contact factory for availability.
Pin Configuration
8-Pin SOIC (M)
16-Pin QSOP (QS)
Pin Description
Pin Number
8-Pin SOIC
Pin Number
16-Pin QSOP
Pin Name
Pin Function
Power-on-Reset output: Open drain N-channel device, active low. This pin
remains asserted during start-up until a time period (t
POR
) after the FB pin
voltage rises above the power good threshold (VFB). The timing capacitor C
POR
determines t
POR
. When the output voltage monitored at the FB pin falls below
V
FB
, /POR is asserted for a minimum of one timing cycle (t
POR
). The /POR pin
requires a pull-up resistor (10kΩ minimum) to VCC.
ON input: Active high. The ON pin is 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
ON
> 1.24V), a
start-up sequence begins and the GATE pin starts ramping up towards its final
operating voltage. When the ON pin receives a logic low signal (V
ON
< 1.19V),
the GATE pin is grounded and /FAULT remains high if VCC is above the UVLO
threshold. ON must be low for at least 20µs after VCC is above the UVLO
threshold in order to initiate a start-up sequence. Additionally, toggling the ON
pin LOW to HIGH resets the circuit breaker.
1
1
/POR
2
3
ON
May 23, 2014
2
Revision 5.0
Micrel, Inc.
MIC2582/MIC5283
Pin Description (Continued)
Pin Number
8-Pin SOIC
Pin Number
16-Pin QSOP
Pin Name
Pin Function
Power-on-Reset timer: A capacitor connected between this pin and ground sets
the supply contact start-up delay (t
START
) and the power-on reset interval (t
POR
).
When VCC rises above the UVLO threshold, and the ON pin is above the ON
threshold, the capacitor connected to C
POR
begins to charge. When the voltage
at CPOR crosses 0.3V, the start-up threshold (V
START
), a start cycle is initiated if
ON is asserted while capacitor C
POR
is immediately discharged to ground. When
the voltage at FB rises above V
FB
, capacitor C
POR
begins to charge again. When
the voltage at CPOR rises above the power-on reset delay threshold (V
TH
), the
timer resets by pulling CPOR to ground, and /POR is de-asserted. If C
POR
is left
open, then t
START
defaults to 20µs.
Ground connection: Tie to analog ground.
Power good threshold input (Undervoltage 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
POR
, indicating an
output undervoltage 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 undervoltage 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
TRIPSLOW
), the GATE voltage is adjusted to
ensure a constant load current. If V
TRIPSLOW
(50mV) is exceeded for longer than
time period t
OCSLOW
, then the circuit breaker is tripped and the GATE pin is
immediately pulled low. If the voltage across the sense resistor exceeds the fast
trip circuit breaker threshold, V
TRIPFAST
, at any point due to fast, high amplitude
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
TRIPFAST
for either device is 100mV. Other fast trip thresholds are
available: 150mV, 200mV, or OFF (V
TRIPFAST
disabled). Please contact factory for
availability of other options.
Positive supply input: 2.3V to 13.2V. The GATE pin is held low by an internal
undervoltage 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.
Power good output: Open-drain N-channel device, active high. When the voltage
at the FB pin is lower than 1.24V, PWRGD output is held low. When the voltage
at the FB pin exceeds 1.24V, then PWRGD is asserted immediately. The
PWRGD pin requires a pull-up resistor (10kΩ minimum) to VCC.
Current-limit response timer: A capacitor connected to this pin defines the period
of time (t
OCSLOW
) in which an overcurrent event must last to signal a fault
condition and trip the circuit breaker. If no capacitor is connected, then t
OCSLOW
defaults to 5µs.
Circuit breaker fault status output: Open-drain N-channel device, active low. The
/FAULT pin is asserted when the circuit breaker trips due to an overcurrent
condition or when an undervoltage lockout condition exists. The/FAULT pin
requires a pull-up resistor (10kΩ minimum) to VCC.
3
4
CPOR
4
7, 8
GND
5
12
FB
6
14
GATE
7
15
SENSE
8
16
VCC
n/a
2
PWRGD
n/a
5
CFILTER
n/a
11
/FAULT
May 23, 2014
3
Revision 5.0
Micrel, Inc.
MIC2582/MIC5283
Pin Description (Continued)
Pin Number
8-Pin SOIC
n/a
n/a
Pin Number
16-Pin QSOP
13
6, 9, 10
Pin Name
DIS
NC
Pin Function
Discharge output: When the MIC2583/83R is turned off, a 500Ω internal resistor
at this output allows the discharging of any load capacitance to ground.
No internal connection.
Note: Please refer to the Applications Section and Figure 3 for a detailed explanation of the start-up and operation sequence of the MIC2582
pins shown in the Pin Description table.
May 23, 2014
4
Revision 5.0
Micrel, Inc.
MIC2582/MIC5283
Absolute Maximum Ratings
(2)
Supply Voltage (V
CC
) ..................................... –0.3V to +20V
/POR, /FAULT, PWRGD Pins. ........................ –0.3V to 15V
SENSE Pin ............................................–0.3V to VCC+0.3V
ON Pin ...................................................–0.3V to VCC+0.3V
GATE Pin ........................................................ –0.3V to 20V
FB Input Pins ..................................................... –0.3V to 6V
Junction Temperature .............................................. +125°C
Lead Temperature
Standard Package (-JBM and –xBQS)
(IR Reflow, Peak Temperature) ......... 240°C + 0°C/-5°C
Pb-Free Package (-xYM or –xYQS)
(IR Reflow, Peak Temperature) ......... 260°C + 0°C/-5°C
(4)
ESD Rating
Human body model.................................................. 2kV
Machine model ...................................................... 100V
Operating Ratings
(3)
Supply Voltage (V
CC
) .................................. +2.3V to +13.2V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Resistance
SOIC (
JA
) ........................................................ 163°C/W
QSOP (
JA
) ...................................................... 112°C/W
Electrical Characteristics
(5)
V
CC
= 5.0V; T
A
= 25°C,
bold
values indicate –40°C≤ T
A
≤ +85°C, unless noted.
Symbol
V
CC
I
CC
V
TRIP
Parameter
Supply Voltage
Supply Current
Circuit Breaker Trip Voltage
(Current-Limit Threshold)
V
ON
= 2V
V
TRIP
= V
CC
− V
SENSE
V
TRIPSLOW
V
TRIPFAST
(MIC2582-Jxx)
V
TRIPFAST
(MIC2583/83R) X = J
X=K
X=L
V
GS
External Gate Drive
V
GATE
− V
CC
V
CC
> 3V
V
CC
= 2.3V
I
GATE
GATE Pin Pull-Up Current
Start Cycle, V
GATE
= 0V, V
CC
= 13.2V
V
CC
= 2.3V
I
GATEOFF
GATE Pin Sink Current
V
GATE
> 1V
/FAULT = 0
(MIC2583/83R only)
I
TIMER
Current-Limit/Overcurrent Timer
(CFILTER) Current
(MIC2583/83R)
Power-on-Reset Timer Current
V
CC
= 13.2V,
Note 6
V
CC
= 2.3V,
Note 6
Turn Off
−8.5
4.5
−3.5
0.5
1.19
2.1
1.90
85
130
175
7
3.5
−30
−26
42
Condition
Min.
2.3
1.5
50
100
100
150
200
8
4.8
17
17
100
50
110
−6.5
6.5
2.5
1.3
1.245
2.2
2.05
150
1.30
2.3
2.20
−4.5
8.5
−1.5
110
170
225
9
6.5
−8
−8
Typ.
Max.
13.2
2.5
59
mV
mV
mV
mV
V
V
µA
µA
mA
mA
µA
µA
µA
µA
mA
V
V
V
mV
Units
V
mA
V
CC
− V
SENSE
> V
TRIPSLOW
(timer on)
V
CC
− V
SENSE
> V
TRIPSLOW
(timer off)
Timer on
Timer off
I
CPOR
V
TH
V
UV
POR Delay and Overcurrent
Timer (CFILTER) Threshold
Undervoltage Lockout Threshold
V
CPOR
rising
V
CFILTER
rising (MIC2583/83R only)
V
CC
rising
V
CC
falling
V
UVHYS
Undervoltage Lockout Hysteresis
May 23, 2014
5
Revision 5.0
PCB设计
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