MIC2582/MIC2583
Micrel
MIC2582/MIC2583
Single Channel Hot Swap Controllers
Final
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
overcurrent condition.
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
• Dual-level overcurrent fault sensing eliminates false
tripping
• Fast response to short circuit conditions (<1µs)
• Programmable output undervoltage detection
• Undervoltage Lockout (UVLO) protection
• Auto-restart function (MIC2583R)
• Power-On Reset and Power-Good status outputs
(Power-Good for the MIC2583 and MIC2583R only)
• /FAULT status output (MIC2583 and MIC2583R)
Applications
•
•
•
•
•
RAID systems
Base stations
PC board hot swap insertion and removal
Hot swap CompactPCI cards
Network switches
Typical Application
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
V
IN
12V
**D1
(18V)
Long Pin
R1
3.3Ω
C1
1µF
3
R
SENSE
0.006Ω
2%
2
1
4
Q1
Si7892DP
(PowerPAK™ SO-8)
V
OUT
12V@6A
C
LOAD
500µF
16
15
VCC
Short Pin
3
SENSE
GATE
ON
DIS
PWRGD
11
14
R2
76.8kΩ
1%
R3
R4
9.76kΩ
47kΩ
1%
/FAULT
Signal
Medium
(or Short) Pin
C2
0.01µF
13
R5
93.1kΩ
1%
V
IN
R7
47kΩ
V
IN
R8
47kΩ
DOWNSTREAM
CONTROLLER
MIC2583/83R
2
Power-Good Output
1
EN
/RESET
FAULT
/POR
FB
CPOR
4
Power-On Reset Output
12
GND
7, 8
CFILTER
5
Long Pin
GND
C3
0.1µF
C4
8200pF
R6
12.4kΩ
1%
*Undervoltage (Input) = 10.5V
*Undervoltage (Output) &
Power-Good (Output) = 11.0V
*START-UP Delay = 12ms
*/POR Delay = 50ms
*Circuit Breaker Response Time = 1.5ms
**D1 is BZX84C18
*(See Functional Description and Applications Information)
Figure 1. MIC2583/83R Typical Application Circuit
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
April 2003
1
MIC2582/MIC2583
MICREL [ MICREL SEMICONDUCTOR ]
