Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

VIN, ILIM

−0.3V to 20V

SW/CSH (Note 5)

−0.5V to 20V

BOOST, HG

−0.3V to 25V

BOOST to SW

−0.3V to 6V

FB

−0.3V to 2V

TRACK, FREQ, FPWM, VLIN5,

SNS, LG, CSL

−0.3V to 6V

Storage Temperature

−65˚C to +150˚C

Soldering Information

Lead Temperature (soldering, 10

sec)

260˚C

Infrared or Convection (15 sec)

235˚C

ESD Rating (Note 2)

2kV

Operating Ratings (Note 1)

Supply Voltage Range (V

2.9V to 18V

BOOST to SW

2.5V to 5.5V

Junction Temperature

−40˚C to +125˚C

apply over the full Operating Junction Temperature (T

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

reference purposes only. Unless otherwise indicated, V

Symbol

Parameter

Conditions

Min

Typ

(Note

4)

Max

Units

SYSTEM PARAMETERS

V

FB

FB Pin Voltage

-20˚C to 85˚C

0.594

0.6

0.606

V

-40˚C to 125˚C

0.591

0.6

0.609

∆V

Line Regulation

0.1

%

Load Regulation

0.1

%

V

ON

UVLO Thresholds

VIN Rising

2.55

2.6

2.7

V

VIN Falling

2.26

2.3

2.45

I

Q

Operating VIN Current

Not switching

1.8

mA

Quiescent Current

Shutdown, VIN = 18V

33

µA

I

ILIM

ILIM Pin Source Current

18

20

22

µA

V

ILIM-MAX

Maximum Current Limit Sense

Voltage

200

mV

I

SD

COMP/SD Pin Pull-up current

COMP/SD = 0V

2

2.6

µA

V

HICCUP

COMP/SD Pin Hiccup Threshold

2V

t

DELAY

Hiccup Delay

16

Cycles

t

COOL

Cool Down Time Until Restart

4096

Cycles

t

SS

Internal Soft start Time

400

Cycles

V

OVP

Over Voltage Protection Threshold

Asa%of nominal output voltage

116

125

132

%

I

FPWM

FPWM Pin Pull-up Current

FPWM = 0V

4.5

µA

V

FPWM-LO

FPWM Operation Threshold

FPWM Voltage Falling

0.9

V

R

SNS

SNS Pin Input Resistance

SNS = 1.5V

30

k

Ω

R

DIS

SNS Pin Discharge FET R

DSON

SNS = 1.5V

COMP/SD = 0V

350

440

530

Ω

GATE DRIVE

I

BOOST

BOOST Pin Leakage Current

BOOST - SW = 5.5V

25

nA

R

DS1

High-Side FET Driver Pull-up ON

resistance

BOOST - SW = 4.5V

4.5

Ω

R

DS2

High-Side FET Driver Pull-down ON

resistance

BOOST - SW = 4.5V

0.9

Ω

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