MIC2582 Datasheet, PDF (1/22 Pages) Micrel Semiconductor – Single Channel Hot Swap Controllers

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
V_IN
12V
/FAULT
Signal
GND
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR Long Pin
**D1
(18V)
R1
3.3Ω
C1
1µF
Short Pin
R2
76.8kΩ
R4
1% _R3
47kΩ
9.76kΩ
1%
3 _ON
R_SENSE
0.006Ω
1 ^2% 2
3
4
16
VCC
15
SENSE
MIC2583/83R
Q1
Si7892DP
(PowerPAK™ SO-8)
GATE ¹⁴
DIS ¹³
PWRGD ²
C2
0.01µF
Medium
(or Short) Pin
Long Pin
11 _FAULT
CPOR GND
4
7, 8
C3
0.1µF
/POR ¹
FB ¹²
CFILTER
5
C4
8200pF
V_OUT
12V@6A
C_LOAD
500µF
R5
93.1kΩ
1%
V_IN
V_IN
R7
R8
47kΩ 47kΩ
Power-Good Output
Power-On Reset Output
DOWNSTREAM
CONTROLLER
EN
/RESET
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 [phone] • fax + 1 [phone] • http://www.micrel.com
April 2003
1
MIC2582/MIC2583