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, RON to GND

-0.3V to 25V

EN, FB, SS to GND

-0.3V to 7V

Junction Temperature

150°C

Storage Temperature Range

-65°C to 150°C

ESD Susceptibility(Note 2)

± 2 kV

For soldering specifications:

see product folder at www.national.com and

www.national.com/ms/MS/MS-SOLDERING.pdf

Operating Ratings (Note 1)

V

IN

4.5V to 20V

EN

0V to 6.5V

Operation Junction Temperature

−40°C to 125°C

junction temperature (T

correlation. Typical values represent the most likely parametric norm at T

Unless otherwise stated the following conditions apply: V

Symbol

Parameter

Conditions

Min

(Note 3)

Typ

(Note 4)

Max

(Note 3)

Units

SYSTEM PARAMETERS

Enable Control

V

EN

EN threshold trip point

V

1.1

1.18

1.25

V

V

EN-HYS

EN threshold hysteresis

V

90

mV

Soft-Start

I

SS

SS source current

V

5

8

11

µA

I

SS-DIS

SS discharge current

-200

µA

Current Limit

I

CL

Current limit threshold

d.c. average

V

3.2

4.2

5.25

A

ON/OFF Timer

t

ON-MIN

ON timer minimum pulse width

150

ns

t

OFF

OFF timer pulse width

260

ns

Regulation and Over-Voltage Comparator

V

FB

In-regulation feedback voltage

V

T

I

0.773

0.793

0.813

V

V

T

I

0.784

0.800

0.816

V

FB-OV

Feedback over-voltage

protection threshold

0.92

V

I

FB

Feedback input bias current

5

nA

I

Q

Non Switching Input Current

V

1

mA

I

SD

Shut Down Quiescent Current

V

25

μA

Thermal Characteristics

T

SD

Thermal Shutdown

Rising

165

°C

T

SD-HYST

Thermal shutdown hysteresis

Falling

15

°C

θ

JA

Junction to Ambient

4 layer JEDEC Printed Circuit Board,

100 vias, No air flow

19.3

°C/W

2 layer JEDEC Printed Circuit Board, No

air flow

21.5

°C/W

θ

JC

Junction to Case

No air flow

1.9

°C/W

PERFORMANCE PARAMETERS

ΔV

O

Output Voltage Ripple

8

mV

PP

ΔV

Line Regulation

V

.01

%

ΔV

Load Regulation

V

1.5

mV/A

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