Limits in standard type are for T

-40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values

represent the most likely parametric norm at T

the following conditions apply: V

Ω. See (Note 3)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Minimum Off Time

Minimum Off Timer

FB = 0V

300

ns

Regulation and OV Comparators

FB Reference Threshold

Internal reference

Trip point for switch ON

2.445

2.5

2.550

V

FB Over-Voltage Threshold

Trip point for switch OFF

2.875

V

FB Bias Current

1

nA

Thermal Shutdown

Tsd

Thermal Shutdown Temp.

165

˚C

Thermal Shutdown Hysteresis

25

˚C

Thermal Resistance

θ

JA

Junction to Ambient

MUA Package

200

˚C/W

SDC Package

˚C/W

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: For detailed information on soldering plastic MSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor

Corporation.

are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.

Note 5: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin. All pins are rated for 2 kV, except VIN and VCC which are

rated for 1 kV.

Note 6: For devices procured in the LLP-8 package the Rds(on) limits are guaranteed by design characterization data only.

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