LM5069_08 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Positive High Voltage Hot Swap / Inrush Current Controller with Power Limiting

March 5, 2008
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 cur-
rent limit and power dissipation in the external series pass N-
Channel MOSFET are programmable, ensuring operation
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 lock-
out levels and hysteresis are programmable, as well as the
initial insertion delay time and fault detection time. The
LM5069-1 latches off after a fault detection, while the
LM5069-2 automatically restarts at a fixed duty cycle. The
LM5069 is available in a 10 pin MSOP 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}
■ ^{Internal high side charge pump and gate driver for external}
N-channel MOSFET
■ ^{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}
■ ^{Base Station Power Distribution Systems}
■ ^{Solid State Circuit Breaker}
■ ^{24V/48V Industrial Systems}
Package
■ ^MSOP-10
Typical Application
Positive Power Supply Control
20197201
© 2008 National Semiconductor Corporation 201972
www.national.com