Specifications with standard typeface are for T

Temperature range.V

Ω, unless otherwise stated (Note 5) and (Note 6).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Regulation and Over-Voltage Comparators (FB Pin)

V

REF

FB regulation threshold

SS pin = steady state

2.445

2.5

2.550

V

FB over-voltage threshold

2.9

V

FB bias current

1

nA

Thermal Shutdown

T

SD

Thermal shutdown

temperature

175

˚C

Thermal shutdown hysteresis

20

˚C

Thermal Resistance

θ

JA

Junction to Ambient

SDC Package

MXA Package

40

40

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

Ω resistor into each pin.

Note 4: For detailed information on soldering plastic TSSOP and LLP packages refer to the Packaging Data Book available from National Semiconductor

Corporation.

Note 5: Typical specifications represent the most likely parametric norm at 25˚C operation.

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

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