junction temperature (T

statistical correlation. Typical values represent the most likely parametric norm at T

purposes only. Unless otherwise stated the following conditions apply: VIN = 48V. (Continued)

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

Current Limit

V

CL

Threshold voltage

VIN-SENSE voltage

48.5

55

61.5

mV

t

CL

Response time

VIN-SENSE stepped from 0 mV to

80 mV

45

µs

I

SENSE

SENSE input current

Enabled, SENSE = OUT

23

µA

Disabled, OUT = 0V

60

Circuit Breaker

V

CB

Threshold voltage

VIN - SENSE

80

105

130

mV

t

CB

Response time

VIN - SENSE stepped from 0 mV

to 150 mV, time to GATE low, no

load

0.44

1.2

µs

Timer (TIMER pin)

V

TMRH

Upper threshold

3.76

4

4.16

V

V

TMRL

Lower threshold

Restart cycles (LM5069-2)

1.187

1.25

1.313

V

End of 8th cycle (LM5069-2)

0.3

V

Re-enable Threshold (LM5069-1)

0.3

V

I

TIMER

Insertion time current

3

5.5

8

µA

Sink current, end of insertion time

TIMER pin = 2V

1.0

1.5

2.0

mA

Fault detection current

51

85

120

µA

Fault sink current

1.25

2.5

3.75

µA

DC

FAULT

Fault Restart Duty Cycle

LM5069-2 only

0.5

%

t

FAULT

Fault to GATE low delay

TIMER pin reaches 4.0V

12

µs

Power Good (PGD pin)

PGD

TH

Threshold measured at SENSE-OUT

Decreasing

0.67

1.25

1.85

V

Increasing, relative to decreasing

threshold

0.95

1.25

1.55

PGD

VOL

Output low voltage

I

60

150

mV

PGD

IOH

Off leakage current

V

5

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 k

Ω resistor into each pin.

Note 3: OUT bias current (disabled) due to leakage current through an internal 1.0 M

Ω resistance 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: The GATE pin voltage is typically 12V above VIN when the LM5069 is enabled. Therefore the Absolute Maximum Ratings for VIN (100V) applies only when

the LM5069 is disabled, or for a momentary surge to that voltage since the Absolute Maximum Rating for the GATE pin is also 100V.

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