Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Voltages from the indicated pins to GND

AVIN

−0.3V to +26V

PVIN

−0.3V to (AV

CBOOT

−0.3V to +33V

CBOOT to SW

−0.3V to +7V

FB, SD, SS, PGOOD

−0.3V to +7V

Storage Temperature Range

−65˚C to +150˚C

Junction Temperature

+150˚C

Lead Temperature

(Soldering, 10 sec.)

260˚C

Minimum ESD Rating

1.5 kV

Operating Range

Junction

Temperature

−40˚C to +125˚C

AVIN to GND

4.5V to 24V

PVIN

4.5V to 24V

type apply over the full Operating Temperature Range (T

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

are provided for reference purposes only. Unless otherwise specified V

Symbol

Parameter

Condition

Min

Typ

Max

Units

V

FB

Feedback Pin Voltage

V

I

1.225

1.254

1.282

V

I

CL

Switch Current Limit

V

3.6

4.9

6.4

A

R

DS_ON

Switch On Resistance

I

0.13

0.22

Ω

I

Q

Operating Quiescent Current

V

1.3

2

mA

V

UVLO

AVIN Under Voltage Lockout

Rising V

IN

3.9

4.125

4.3

V

V

UVLO HYS

AVIN Under Voltage Lockout Hysteresis

60

120

mV

I

SD

Shutdown Quiescent Current

V

12

25

µA

k

ON

Switch On-Time Constant

I

50

66

82

µA µs

V

DON

R

0.35

0.65

0.95

V

T

OFF_MIN

Minimum Off Time

FB = 1.24V

FB=0V

165

12

250

30

ns

µs

T

ON MIN

Minimum On-time

400

ns

V

EXTVCC

EXTV

3.30

3.65

4.00

V

∆V

EXTVCC

EXTV

I

0.03

0.5

%

V

PWRGD

PGOOD Threshold (PGOOD Transition

from Low to High)

With respect to V

FB

91.5

93.5

95.5

%

V

PG_HYS

PGOOD Hysteresis

1

2.1

%

I

OL

PGOOD Low Sink Current

V

0.5

2mA

I

OH

PGOOD High Leakage Current

50

nA

I

FB

Feedback Pin Bias Current

V

0

nA

I

SS_SOURCE

Soft-Start Pin Source Current

V

0.7

1

1.4

µA

I

SS SINK

Soft-Start Pin Sink Current

V

V

15

mA

I

SD

Shutdown Pull-Up Current

V

1

3

µA

V

IH

SD Pin Minimum High Input Level

1.8

V

V

IL

SD Pin Maximum Low Input Level

0.6

V

θ

J-A

Thermal Resistance

35.1

˚C/W

Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics.

temperature),

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