Absolute Maximum Ratings (Note 5)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

VIN, VOUT, EN, FB, SS to GND

-0.3V to 6.0V

ESD Susceptibility (Note 6)

±2 kV

Power Dissipation

Internally Limited

Junction Temperature

150°C

Storage Temperature Range

-65°C to 150°C

Peak Reflow Case Temperature

(30 sec)

245°C

Operating Ratings (Note 5)

VIN to GND

2.95V to 5.5V

Junction Temperature (T

-55°C to 125°C

apply over the operating junction temperature range T

test, design, or statistical correlation. Typical values represent the most likely parametric norm at T

reference purposes only. V

Symbol

Parameter

Conditions

Min

(Note 7)

Typ

(Note 8)

Max

(Note 7)

Units

SYSTEM PARAMETERS

V

FB

Total Feedback Voltage Variation

Including Line and Load Regulation

V

V

I

0.78

0.8

0.82

V

V

FB

Feedback Voltage Variation

V

I

0.787

0.8

0.812

V

V

FB

Feedback Voltage Variation

V

I

0.785

0.798

0.81

V

V

IN(UVLO)

Input UVLO Threshold (Measured at VIN

pin)

Rising

2.6

2.95

V

Falling

1.95

2.4

I

SS

Soft-Start Current

Charging Current

2

µA

I

Q

Non-Switching Input Current

V

1.7

3

mA

I

SD

Shut Down Quiescent Current

V

260

500

µA

I

OCL

Output Current Limit (Average Current)

V

4.1

5.5

6.7

A

f

FB

Frequency Fold-back

In current limit

250

kHz

PWM SECTION

f

SW

Switching Frequency

700

1000

1160

kHz

D

range

PWM Duty Cycle Range

0

100

%

ENABLE CONTROL

V

EN-IH

EN Pin Rising Threshold

1.23

1.8

V

V

EN-IF

EN Pin Falling Threshold

0.8

1.06

V

THERMAL CONTROL

T

SD

T

145

°C

T

SD-HYS

Hysteresis for Thermal Shutdown

10

°C

THERMAL RESISTANCE

θ

JA

Junction to Ambient

(Note 3)

20

°C/W

θ

JC

Junction to Case

No air flow

1.9

°C/W

3

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