Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

ESD Tolerance (Note 2)

2kV

Input Voltage

17V

SD Pin Voltage

7V

FB Pin Voltage (All Options)

7V

Storage Temp. Range

−65˚C to 150˚C

Junction Temperature

150˚C

Operating Ratings

Supply Voltage (V

8.5V to 16V

Junction Temperature Range

−40˚C to +125˚C

Package Thermal Resistance

(TSSOP-16) (Note 4)

130˚C/W

Electrical Characteristics

Unless otherwise specified, all limits are guaranteed for T

otherwise noted. Boldface apply over the temperature extremes. ’V

regulation.

Symbol

Parameter

Conditions

Min

(Note 5)

Typ

(Note

6)

Max

(Note 5)

Units

V

FB_ADJ

Voltage on Feedback pin

(Adjustable version in regulation)

2.37

2.35

2.42

2.49

2.5

V

V

FB_5

Voltage on Feedback pin (Fixed

5V version in regulation)

4.85

4.8

5.0

5.15

5.2

V

V

FB_3.3

Voltage on Feedback pin (Fixed

3.3V version in regulation)

3.22

3.16

3.3

3.4

3.44

V

∆V

Feedback Voltage Line

Regulation

V

−0.05

0

0.05

%/V

I

FB_REG

Feedback Pin Bias Current

(Adjustable Part)

V

0

0.5

1.5

µA

AV

ERROR

Error Amplifier Voltage Gain

(Note 7)

350

gm

EA

Error Amplifier

Transconductance (Note 7)

1100

800

2000

2700

3200

µMho

gm

COMP_SW

Comp Pin to Switch Current

Transconductance

2

A/V

I

EA_SOURCE

Error Amplifier Source Current

V

50

200

300

µA

I

EA_SINK

Error Amplifier Sink Current

V

2.4

mA

V

COMP_TH

Comp Pin Switching Threshold

Duty Cycle = 0

0.9

V

V

COMP_LIM

Comp Pin High Clamp

2

V

I

CLIM

Switch Current Limit

V

Comp Open,

V

D

≤ 0.5

2.0

2.7

3.2

A

D = 0.8

1.75

2.4

3

R

DS

Switch ON Resistance

I

0.15

0.4

0.5

Ω

D

MAX

Maximum Duty Cycle

(Note 8)

Comp Open,

V

86

94

%

f

SW

Switch Frequency

V

Full Temp.

Range

400

500

570

kHz

-20˚C

≤ T

J

≤

125˚C

440

560

f

REG

Switch Frequency Line

Regulation

V

V

0.01

%/V

∆f

FOLDBACK

Foldback Frequency shift

(Adjustable part)

V

20

90

160

kHz

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