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National Semiconductor - Positive Low Voltage Power Limiting Hot Swap Controller

Numéro de référence LM25069
Description Positive Low Voltage Power Limiting Hot Swap Controller
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM25069 fiche technique
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LM25069
July 15, 2009
Positive Low Voltage Power Limiting Hot Swap Controller
General Description
The LM25069 positive hot swap controller provides intelligent
control of the power supply voltage to the load during insertion
and removal of circuit cards from a live system backplane or
other "hot" power sources. The LM25069 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 1.3V
of the input voltage. The input under-voltage and over-voltage
lockout levels and hysteresis are programmable, as well as
the initial insertion delay time and fault detection time. The
LM25069-1 latches off after a fault detection, while the
LM25069-2 automatically restarts at a fixed duty cycle. The
LM25069 is available in a 10 pin MSOP package.
Features
Operating range: +2.9V to +17V
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
Package
MSOP-10
Typical Application
Positive Power Supply Control
30086701
© 2009 National Semiconductor Corporation 300867
www.national.com

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