ISL6111CR-T【PDF 1/8 页】IC CTRLR HOT PLUG SWITCH 20-QFN

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FN9146.1

ISL6111

Current Regulated PCI Hot Plug Power

Switch Controller

The ISL6111 is designed for use in PCI and PCI-X

applications where active current regulation protection of the

motherboard from an abnormal PCI load card is desired.

With the addition of two discrete power MOSFETs and a few

passive components, the ISL6111 provides power control for

the four legacy supplies (-12V, +12V, +5V, +3.3V) to a PCI or

PCI-X slot. This IC integrates the +12V and -12V current

sensing and regulation switches. On the 25W capable 3.3V

and 5V rails, current regulation (CR) protection is provided

by sensing the voltage across external current-sense

resistors and modulation of the gate voltage bias on the

external N-channel power MOSFETs.

During initial power-up of the +12V bias supply, the ENABLE

(EN), Power Good (PG), fault monitoring and reporting

function functions are inhibited if bias voltage <10V. Once

the FETs are enabled they are soft started into the load thus

eliminating supply rail disturbances.

Upon a failure that quickly causes a load current greater

than the programmed CR level on any voltage supply, the

ISL6111 enters its current regulation (CR) mode, limiting the

load current to the user programmed level for the user

determined period of time. The CR level and duration are set

by a single resistor and capacitor respectively. At the end of

the CR duration all the switches will latch off pulling the

outputs low along with the CRTIM (current regulation timer)

and FLTN (fault not) pins indicating a latch-off due to an over

current (OC) condition. If a severe OC condition should

occur, then the ISL6111 immediately latches off all outputs

and sets the FLTN output low.

During operation, if any of the positive voltages falls below

the minimum PCI specified levels the power good (PG)

output will pull low indicating a non compliant voltage to a

load. PG is an open drain output as is FLTN.

The CRSET pin allows programming of the current

regulation levels to be scaled up or down from the PCI

specified levels via a resistor connected between the

CRSET pin and ground.

All faults and latches are cleared by ENABLE being

deasserted low.

Features

" Active Current Regulation for Protection

" Adjustable Current Regulation Duration and Magnitude

" Internal MOSFET Switches for +12V and -12V Outputs

" Provides Fault Isolation

" Adjustable Turn-On Slew Rate

" Minimum Parts Count Solution

" No Charge Pump

" 1祍 Response Time to Over Current

" Pb-Free leadframe

Applications

" PCI

" PCI-X 1.0

Pinout

ISL6111 (5x5 QFN)

TOP VIEW

Ordering Information

PART NUMBER

TEMP. RANGE

(癈)

PACKAGE

PKG.

DWG. #

ISL6111CRZA

(see Note)

0 to 75

20 Ld 5x5 QFN

(Pb-Free)

L20.5x5

ISL6111EVAL2

Evaluation Platform

NOTE: Intersil Lead-Free products employ special lead-free

material sets; molding compounds/die attach materials and 100%

matte tin plate termination finish, which is compatible with both SnPb

and lead-free soldering operations. Intersil Lead-Free products are

MSL classified at lead-free peak reflow temperatures that meet or

exceed the lead-free requirements of IPC/JEDEC J Std-020B.

M12VG

GND_A

12VO_B

12VO_A

5VG

3VG

12VI_A

GND_B

12VI_B

PGOOD

6 7 8 9 10

20 19 18 17 16

-12V

Data Sheet

March 2004

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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