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National Semiconductor Electronic Components Datasheet

LM25061 Datasheet

Positive Low Voltage Power Limiting Hot Swap Controller

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LM25061 pdf
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LM25061
July 15, 2009
Positive Low Voltage Power Limiting Hot Swap Controller
General Description
The LM25061 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 LM25061 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 exceeds a
programmable threshold. The input under-voltage level and
hysteresis are programmable, as well as the initial insertion
delay time and fault detection time. The LM25061-1 latches
off after a fault detection, while the LM25061-2 automatically
restarts at a fixed duty cycle. The LM25061 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 output voltage monitoring 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
30090301
© 2009 National Semiconductor Corporation 300903
www.national.com


National Semiconductor Electronic Components Datasheet

LM25061 Datasheet

Positive Low Voltage Power Limiting Hot Swap Controller

No Preview Available !

LM25061 pdf
www.DataShCeeot4Un.cnomection Diagram
Top View
10-Lead MSOP
30090302
Ordering Information
Order Number Fault Response Package Type
LM25061PMME-1 Latch Off
LM25061PMM-1 Latch Off
LM25061PMMX-1 Latch Off
LM25061PMME-2 Auto Restart
MSOP-10
LM25061PMM-2 Auto Restart
LM25061PMMX-2 Auto Restart
NSC Package
Drawing
MUB10A
Supplied As
250 Units on Tape
and Reel
1000 Units on
Tape and Reel
3500 Units on
Tape and Reel
250 Units on Tape
and Reel
1000 Units on
Tape and Reel
3500 Units on
Tape and Reel
Pin Descriptions
Pin # Name
1 SENSE
2 VIN
3 UVLO/EN
4 FB
5 GND
6 TIMER
7 PWR
8 PGD
Description
Current sense input
Positive supply input
Under-voltage lockout
Output feedback
Circuit ground
Timing capacitor
Power limit set
Power Good indicator
Applications Information
The voltage across the current sense resistor (RS) is measured from VIN to this
pin. If the voltage across RS reaches 50mV the load current is limited and the fault
timer activates.
A small ceramic bypass capacitor close to this pin is recommended to suppress
transients which occur when the load current is switched off.
An external resistor divider from the system input voltage sets the under-voltage
turn-on threshold. An internal 20 µA current source provides hysteresis. The
enable threshold at the pin is 1.17V. This pin can also be used for remote
shutdown control.
An external resistor divider from the output sets the output voltage at which the
PGD pin switches. The threshold at the pin is 1.17V. An internal 22 µA current
source provides hysteresis.
An external capacitor connected to this pin sets the insertion time delay and the
Fault Timeout Period. The capacitor also sets the restart timing of the LM25061-2.
An external resistor connected to this pin, in conjunction with the current sense
resistor (RS), sets the maximum power dissipation allowed in the external series
pass MOSFET.
An open drain output. This output is high when the voltages at the FB pin and at
the UVLO pin are above their thresholds.
www.national.com
2


Part Number LM25061
Description Positive Low Voltage Power Limiting Hot Swap Controller
Maker National Semiconductor
Total Page 22 Pages
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