Absolute Maximum Ratings (Note 4)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN

-0.3V to 40V

SW Voltage

-0.3V to 80V

FB Voltage

-0.3V to 5V

COMP Voltage

-0.3V to 3V

All Other Pins

-0.3V to 7V

Maximum Junction Temperature

150˚C

Power Dissipation(Note 5)

Internally Limited

Lead Temperature

216˚C

Infrared (15 sec.)

235˚C

ESD Susceptibility (Note 6)

Human Body Model

2kV

Machine Model

200V

Storage Temperature

−65˚C to +150˚C

Operating Conditions

Operating Junction

Temperature Range

(Note 10)

−40˚C to +125˚C

Supply Voltage (Note 10)

3.1V to 40V

Electrical Characteristics

Specifications in standard type face are for T

ture Range (T

Symbol

Parameter

Conditions

Min

(Note 7)

Typ

(Note 8)

Max

(Note 7)

Units

I

Q

Quiescent Current

FB = 2V (Not Switching)

FS=0V

2.0

2.5

mA

FB = 2V (Not Switching)

FS = Open

2.1

2.5

mA

V

18

30

µA

V

FB

Feedback Voltage

1.2330

1.259

1.2840

V

I

CL

Switch Current Limit

1.35

2.0

2.7

A

%V

∆V

IN

Feedback Voltage Line

Regulation

3.1V

≤ V

IN

≤ 40V

0.001

0.04

%/V

I

B

FB Pin Bias Current (Note 9)

55

200

nA

BV

Output Switch Breakdown

Voltage

T

80

V

T

0.5µA

76

V

IN

Input Voltage Range

3.1

40

V

g

m

Error Amp Transconductance

∆I = 5µA

150

410

750

µmho

A

V

Error Amp Voltage Gain

280

V/V

D

MAX

Maximum Duty Cycle

LM5000-3EP

FS=0V

85

90

%

Maximum Duty Cycle

LM5000-6EP

FS=0V

85

90

%

T

MIN

Minimum On Time

165

ns

f

S

Switching Frequency

LM5000-3EP

FS=0V

240

300

360

kHz

FS = Open

550

700

840

Switching Frequency

LM5000-6EP

FS=0V

485

600

715

FS = Open

1.055

1.3

1.545

MHz

I

SHDN

Shutdown Pin Current

V

−1

-2

µA

I

L

Switch Leakage Current

V

0.008

5

µA

R

DSON

Switch R

DSON

I

160

445

m

Ω

Th

SHDN

SHDN Threshold

Output High

0.9

0.6

V

Output Low

0.6

0.3

V

UVLO

On Threshold

2.74

2.92

3.10

V

Off Threshold

2.60

2. 77

2.96

V

OVP

V

0.67

V

I

SS

Softstart Current

8

11

14

µA

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