April 2003

1

MIC2582/MIC2583

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.

Typical Application

SENSE

DOWNSTREAM

CONTROLLER

Power-Good Output

Power-On Reset Output

VCC

GATE

DIS

PWRGD

/POR

EN

/RESET

FB

FAULT

C2

0.01

µF

C1

1

µF

500

µF

Q1

Si7892DP

(PowerPAK™ SO-8)

12V@6A

12V

/FAULT

Signal

GND

R5

93.1k

Ω

1%

R8

47k

Ω

R1

3.3

Ω

R2

76.8k

Ω

1%

R4

47k

Ω

R3

9.76k

Ω

1%

**D1

(18V)

R6

12.4k

Ω

1%

C4

8200pF

C3

0.1

µF

CPOR

CFILTER

GND

PCB EDGE

CONNECTOR

BACKPLANE

CONNECTOR

Long Pin

Short Pin

Medium

(or Short) Pin

Long Pin

MIC2583/83R

R7

47k

Ω

0.006

Ω

2%

12

34

16

15

14

13

2

1

12

5

7, 8

4

11

ON

3

*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

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 (<1

µs)

• 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

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com