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X80070 Datasheet, PDF (1/14 Pages) Intersil Corporation – Hot Swap Controller with Advanced Fault Protection and Voltage Refulator Output
®
Data Sheet
X80070, X80071, X80072, X80073
March 15, 2005
FN8150.0
Hot Swap Controller with
Advanced Fault Protection and
Voltage Regulator Output
FEATURES
• Hot swap controller
— Overvoltage and undervoltage protection
— Undervoltage lockout for battery/redundant supplies
— Electronic circuit breaker
— Slew Rate for External FET Gate Control
— Overcurrent Detection and Gate Shut-off
— 3X overcurrent limit on insertion
— 5µs overcurrent filter
— Hardshort Retry and Indicator
— Typically operates from -30V to -80V. Tolerates tran-
sients to -200V (limited by external components)
— Positive Voltages (low side switching) from 12V to 60V
— Soft Re-insertion
— Soft extraction
• Battery backup mode
• Hardshort retry
• Overcurrent Filter
• Insertion Limits.
• Selectable Gate Current
• Voltage Regulator Output for Supervisory Functions
• Debounced manual reset input
• Available packages
— 20-lead Quad No-Lead Frame (QFN)
APPLICATIONS
• -48V Hot Swap Power Backplane/Distribution Central
Office, Ethernet for VOIP
• Positive Voltage Hotswap 12V to 60V Applications
(low side switching)
• Card Insertion Detection
• IP Phone Applications
• Databus Power Interfacing
• Custom Industrial Power Backplanes
• Distributed Power Systems
DESCRIPTION
The X80070 is a hot swap controller that allows a board to be
safely inserted and removed from a live backplane without
turning off the main power supply.
During insertion, the gate of an external power MOSFET is
clamped low to suppress contact bounce. The
undervoltage/overvoltage circuits and the power-on reset
circuitry suppress the gate turn on until the mechanical bounce
has ended. The X80070 turns on the gate with a slew rate to
limit the inrush current and incorporates an electronic circuit
breaker set by a sense resistor. After the load is successfully
charged, the PWRGD signal is asserted; indicating that the
device is ready to power sequence the DC-DC power bricks.
At all times, the X80070 monitors for undervoltage, overvoltage,
and overcurrent conditions. If any fault occurs, the gate will be
immediately shut off and the PWRGD will be returned to the
inactive state. The X80070 contains overvoltage, undervoltage
and overcurrent detection, hardshort retry, gate control slew
rate and power good control.
TYPICAL APPLICATION
-48V
Return
X80070
VRGO
* DC-DC
Module
1
ON/OFF
R4
182k
R5
1%
30k
1%
R6
10k
1%
-48V
PWRGD
UV=43V
VUV/OV
OV=75V
VDD
VEE SENSE GATE
IGQ1
IGQ0
Gate
Current
Select
100n
Rs
0.02Ω
5%
22K
100
3.3n
Q1
IRFR120
*
*
* Optional components
Depends on choice of DC-DC Module
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
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