Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN

14.5V

SW Voltage

−0. 4V to 36V

NFB Voltage

+0. 4V to −6V

SHDN Voltage

−0. 4V to 14.5V

Maximum Junction

Temperature

125˚C

Power Dissipation (Note 2)

Internally Limited

Lead Temperature

300˚C

ESD Susceptibility (Note 3)

Human Body Model

2kV

Machine Model

200V

Operating Conditions

Operating Junction

Temperature Range

(Note 4)

−40˚C to +125˚C

Storage Temperature

−65˚C to +150˚C

Supply Voltage

2.7V to 14V

θ

JA

256˚C/W

Electrical Characteristics

Specifications in standard type face are for T

ture Range (T

Symbol

Parameter

Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

V

IN

Input Voltage

2.7

14

V

I

SW

Switch Current Limit

Grade A

1

1.2

2

A

Grade B

0.7

0.9

R

DSON

Switch ON Resistance

Grade A

0.5

0.65

Ω

Grade B

0.7

0.9

SHDN

TH

Shutdown Threshold

Device enabled

1.5

V

Device disabled

0.50

I

SHDN

Shutdown Pin Bias Current

V

0.0

µA

V

0.0

1.0

NFB

Negative Feedback

Reference

V

−1.205

−1.23

−1.255

V

I

NFB

NFB Pin Bias Current

V

−2.7

−4.7

−6.7

µA

I

q

Quiescent Current

V

1.8

3.5

mA

V

270

500

µA

V

0.024

1

µA

%V

∆V

IN

Reference Line Regulation

2.7V

≤ V

0.02

%/V

f

S

Switching Frequency

1.0

1.4

1.8

MHz

D

MAX

Maximum Duty Cycle

82

88

%

I

L

Switch Leakage

Not Switching

V

1µA

Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to

be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.

temperature, and the regulator will go into thermal shutdown.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5k

Ω resistor into each pin. The machine model is a 200pF capacitor discharged

directly into each pin.

Note 4: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested

or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.

All limits are used to calculate Average Outgoing Quality Level (AOQL).

Note 5: Typical numbers are at 25˚C and represent the expected value of the parameter.

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