ISL6112INZA-T【PDF 1/30 页】IC PWR CNTRLR DUAL SLT 48-TQFP

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Dual Slot PCI-Express Hot Plug Controller

ISL6112

The ISL6112 targets the PCI-Express add-in card hot plug

application. Together with two each of N-Channel and

P-Channel MOSFETs, four current sense resistors, and several

external passive components, the ISL6112 provides a

compliant hot plug power control solution to any combination

of two PCI-Express X1, X4, X8 or X16 slots.

The ISL6112 features the ability to program a maximum

current regulated level for each of the MAIN outputs for a

common programmable duration. With this ability, both fault

isolation protection and imperviousness to electrical transients

(OC and soft-start protection) are provided to each system

supply. For each 12VMAIN supply, the current regulated (CR)

level is set by a resistor value dependent on the size of the

PCI-Express connector (X1, X4/X8 or X16) to be powered. This

resistor is a sub ohm standard value current sense resistor;

one each for each of the 3VMAIN and 12VMAIN supplies. The

voltage across this resistor is compared to a 50mV reference,

providing a nominal CR protection level that would be set

above the maximum specified slot limits. The 3.3V supply can

use a 15m& sense resistor, compared to a 50mV reference, to

provide a nominal regulated current limit of 3.3A to all

connector sizes. A shutdown without a CR duration delay is

invoked if RSENSE voltage is >100mV. VAUX is internally

monitored and controlled to provide nominal limiting to 1A of

load current.

The ISL6112 is System Management Interface (SMI) capable,

with an integrated SMBus link for communication, control,

monitoring, and reporting of IC and slot conditions.

Information such as UV, OC, STATUS, and power level are

available. Additionally, the IC has a minimum of I/O for

implementations where Hot-Plug Hardware Interface (HPI) is

implemented.

Features

"Supports Two Independent PCI-Express Slots

"Highest Available Accuracy External RSENSE Current

Monitoring on Main Supplies

"Programmable Current Regulation Protection Function for X1,

X4, X8, X16 Connectors

"12V, 3.3V, and 3.3VAUX Supplies Supported per PCI Express

Specification V1.0A

"Voltage Tolerant I/O SMBus Interface for Slot Power Control

and Status, Compatible with SMBus 2.0 Systems

"Programmable Current Regulation Duration

"Programmable In-Rush Current Limiting

"Dual-Level Fault Detection for Quick Fault Response Without

Nuisance Tripping

"Slot-to-Slot Electrical and Thermal Isolation

"Two General-Purpose Input Pins Suitable for Interface to

Logic and Switches

"Pb-Free (RoHS Compliant)

Applications

"PCI Express V1.0A Hot-Plug Power Control

"PCI-Express Servers

"Power Supply Distribution and Control

FIGURE 1. FAST TRIP THRESHOLD VOLTAGE vs TEMPERATURE

FIGURE 2. AUX CURRENT LIMIT vs TEMPERATURE

100

101

102

103

104

-60 -40 -20 0 20 40 60 80 100 120

TEMPERATURE (癈)

800

850

900

950

1000

1050

1100

1150

1200

-60 -40 -20 0 20 40 60 80 100 120

TEMPERATURE (癈)

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

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

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

August 25, 2011

FN6456.1

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