LM5067 Datasheet, PDF (1/35 Pages) National Semiconductor (TI) – Negative Hot Swap / Inrush Current Controller with Power Limiting

LM5067
www.ti.com
SNVS532C – OCTOBER 2007 – REVISED MARCH 2013
Negative Hot Swap / Inrush Current Controller with Power Limiting
Check for Samples: LM5067
FEATURES
1
•2 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
PACKAGES
• VSSOP-10
• SOIC-14 (Latched Fault Version)
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 current 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 detection, while the LM5067-2
automatically attempts restarts at a fixed duty cycle.
The LM5067 is available in a 10-pin VSSOP package
and a 14-pin SOIC package.
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
Typical Application
GND
- 48V
UVLO / EN
OVLO
TIMER
VCC
PGD
LM5067
PWR
VEE
OUT
SENSE GATE
Q1
R_S
LOAD
Figure 1. Negative Power Bus In-Rush and Fault Protection
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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