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LM5069 Datasheet

  • LM5069

  • Positive High Voltage Hot Swap / Inrush Current Controller w...

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LM5069 Positive High Voltage Hot Swap / Inrush Current Controller with Power Limiting
September 2006
LM5069
Positive High Voltage Hot Swap / Inrush Current
Controller with Power Limiting
General Description
The LM5069 positive hot swap controller provides intelligent
control of the power supply connections during insertion and
removal of circuit cards from a live system backplane or
other "hot" power sources. The LM5069 provides in-rush
current control to limit system voltage droop and transients.
The current limit and power dissipation in the external series
pass N-Channel MOSFET are programmable, ensuring op-
eration within the Safe Operating Area (SOA). The POWER
GOOD output indicates when the output voltage is within
1.25V of the input voltage. The input under-voltage and
over-voltage lockout levels and hysteresis are program-
mable, as well as the initial insertion delay time and fault
detection time. The LM5069-1 latches off after a fault detec-
tion, while the LM5069-2 automatically restarts at a fixed
duty cycle. The LM5069 is available in a 10 pin MSOP
package.
n
Adjustable current limit
n
Circuit breaker function for severe over-current events
n
Internal high side charge pump and gate driver for
external N-channel MOSFET
n
Adjustable under-voltage lockout (UVLO) and hysteresis
n
Adjustable over-voltage lockout (OVLO) and hysteresis
n
Initial insertion timer allows ringing and transients to
subside after system connection
n
Programmable fault timer avoids nuisance trips
n
Active high open drain POWER GOOD output
n
Available in latched fault and automatic restart versions
Applications
n
n
n
n
Server Backplane Systems
Base Station Power Distribution Systems
Solid State Circuit Breaker
24V/48V Industrial Systems
Features
n
Wide operating range: +9V to +80V
n
In-rush current limit for safe board insertion into live
power sources
n
Programmable maximum power dissipation in the
external pass device
Package
n
MSOP-10
Typical Application
20197201
Positive Power Supply Control
漏 2006 National Semiconductor Corporation
DS201972
www.national.com

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