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Part: ISL6111CR
Category:
Power Management
-> Hot Plug
Description: 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.
Company: Intersil Corporation
Datasheet: Download ISL6111CR datasheet File size : 288 kB
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Datasheet text preview:
®
ISL6111
D a ta Sheet M ar c h 2004 FN9146.1
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 · 1µs Response Time to Over Current · Pb-Free leadframe
Applications
· PCI · PCI-X 1.0
Ordering Information
PART NUMBER ISL6111CRZA (see Note) ISL6111EVAL2 TEMP. RANGE (°C) 0 to 75 PACKAGE 20 Ld 5x5 QFN (Pb-Free) PKG. DWG. # L 20 . 5x 5
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.
Pinout
ISL6111 (5x5 QFN) TOP VIEW
3VISEN M12VO 17 CRSET M12VI 16 15 M12VG 14 GND_A -12V 13 12VO_B 12 12VO_A 11 5VG 6 CRTIM 7 FLTN 8 5VISEN 9 5VS 10 EN
20 3VG 12VI_A GND_B 12VI_B PGOOD 1 2 3 4 5
3VS
19
18
1
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. Copyright © Intersil Americas Inc. 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6111 Typical Application
(Note 1) (Note 1) 3.3V SUPPLY 3.3V, 7.6A OUT (Note 1) 12V, 0.5A OUT (Note 1) -12V, 0.1A OUT (Note 1) 5V, 5A OUT (Note 1) RSENSE_5 5V SUPPLY
RSENSE_3
ENABLE INPUT -12V SUPPLY
EN CR TIM 3VG
ISL6111 M12VO M12VG 5VG GND(2) 12VO(2) 5VISEN 5VS CRSET RCRSET (Note 1) 5nF
M12VIN
3VISEN 12V SUPPLY V(I/O) V(I/O) 12VI(2) 3VS PG FLTN CCRTIM (Note 2)
FAULTN POWER GOOD
NOTES: 1. See Table 1 for CR level formula 2. See Table 2 for CR duration vs CTIM. FIGURE 1. ISL6111 TYPICAL APPLICATION SCHEMATIC
2
ISL6111 Simplified Schematic
5VREF RESET FAULT LATCH PGOOD FAULTN
COMP
+ 4.6V
COMP
+ 2.9V
+ -
20µA CRTIM 12VIN 12VIN 12VIN 5VREF 5V ZENER REFERENCE
+ + -
+
-
+ -
+ 12VIN 12VIN POWER-ON RESET LOW WHEN 12VIN < 10V + COMP 12V I N + AMP 3V G + 3VS
+
-
12VIN
+ -
+ 100µA VOCSET CRSET HIGH = FAULT 12VO HIGH = SWITCHES ON ENABLE WOC COMP + + GND + COMP + 0.7 A MP M12VG M12VIN M12VO + M12VIN + COMP + 12V I N AMP 12VIN 0.3
12VIN
3
+
-
+ -
12VIN
COMP +
2.8V WOC COMP
COMP
+ 10.6V
+ COMP
5V S 12VIN + AMP 5VG
WOC COMP
5VISEN
3VISEN WOC COMP
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