LM5067 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Negative Hot Swap / Inrush Current Controller with Power Limiting

LM5067
September 9, 2009
Negative Hot Swap / Inrush Current Controller with Power
Limiting
General Description
The LM5067 negative 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 LM5067 provides in-rush current
control to limit system voltage droop and transients. The cur-
rent limit and power dissipation in the external series pass N-
Channel MOSFET are programmable, ensuring operation
within the Safe Operating Area (SOA). In addition, the
LM5067 provides circuit protection by monitoring for over-
current and over-voltage conditions. The POWER GOOD
output indicates when the output voltage is close to the input
voltage. The input under-voltage and over-voltage lockout
levels and hysteresis are programmable, as well as the fault
detection time. The LM5067-1 latches off after a fault detec-
tion, while the LM5067-2 automatically attempts restarts at a
fixed duty cycle. The LM5067 is available in a 10 pin MSOP
package and a 14 pin SOIC package.
Features
■ ^{Wide operating range: -9V to -80V}
■ ^{In-rush current limit for safe board insertion into live power}
sources
■ ^{Programmable maximum power dissipation in the external}
pass device
■ ^{Adjustable current limit}
■ ^{Circuit breaker function for severe over-current events}
■ ^{Adjustable under-voltage lockout (UVLO) and hysteresis}
■ ^{Adjustable over-voltage lockout (OVLO) and hysteresis}
■ ^{Initial insertion timer allows ringing and transients to}
subside after system connection
■ ^{Programmable fault timer avoids nuisance trips}
■ ^{Active high open drain POWER GOOD output}
■ ^{Available in latched fault and automatic restart versions}
Applications
■ ^{Server Backplane Systems}
■ ^{In-Rush Current Limiting}
■ ^{Solid State Circuit Breaker}
■ ^{Transient Voltage Protector}
■ ^{Solid State Relay}
■ ^{Under-voltage Lock-out}
■ ^{Power Good Detector/Indicator}
Package
■ ^MSOP-10
■ ^{SO-14 (Latched Fault Version)}
Typical Application
Negative Power Bus In-Rush and Fault Protection
30030901
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