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LM25061 Datasheet PDF - National Semiconductor

Part Number LM25061
Description Positive Low Voltage Power Limiting Hot Swap Controller
Manufacturers National Semiconductor 
Logo National Semiconductor Logo 



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LM25061 datasheet, circuit
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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

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LM25061 equivalent
Symbol
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Parameter
VCL Threshold voltage
tCL Response time
ISENSE
SENSE input current
Circuit Breaker
VCB
tCB
Threshold voltage
Response time
Timer (TIMER pin)
VTMRH
VTMRL
Upper threshold
Lower threshold
ITIMER
DCFAULT
tFAULT
Insertion time current
Sink current, end of insertion time
Fault detection current
Fault sink current
Fault Restart Duty Cycle
Fault to GATE low delay
FB Pin
FBTH
FBHYS
FBDEL
FB threshold
FB hysteresis current
FB delay
FBBIAS
FB bias current
Power Good (PGD pin)
PGDVOL
PGDIOH
Output low voltage
Off leakage current
Conditions
Min. Typ. Max. Units
VIN-SENSE voltage
45 50 55 mV
VIN-SENSE stepped from 0 mV to
80 mV
15
µs
Enabled, SENSE = OUT
23 µA
Disabled, OUT = 0V
12
Enabled, OUT = 0V
62
VIN - SENSE
VIN - SENSE stepped from 0 mV to
150 mV, time to GATE low, no load
75
95 110
0.19 0.36
mV
µs
Restart cycles (LM25061-2)
End of 8th cycle (LM25061-2)
Re-enable Threshold (LM25061-1)
TIMER pin = 2V
LM25061-2 only
TIMER pin reaches the upper
threshold
1.60
0.9
-7.5
1.5
-110
1.6
1.72
1.0
0.3
0.3
-5.5
2
-80
2.5
0.67
20
1.85
1.1
-3.5
2.5
-50
3.4
V
V
V
V
µA
mA
µA
µA
%
µs
UVLO = 2V
FB = 2V
Delay to PGD high
Delay to PGD low
FB = 1V
1.145
-28
1.17 1.195
-22 -17
100
110
1
V
µA
ns
µA
ISINK = 2 mA
VPGD = 17V
15 30 mV
1 µA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and conditions see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kresistor into each pin.
Note 3: OUT bias current (disabled) due to leakage current through an internal 1.0 Mresistance from SENSE to VOUT.
Note 4: For detailed information on soldering plastic MSOP packages refer to the Packaging Databook available from National Semiconductor Corporation.
Note 5: Current out of a pin is indicated as a negative number.
5 www.national.com

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Information Total 22 Pages
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