LM3551 datasheet(3/15 Pages) NSC

部件名	LM3551

功能描述	1A White LED Driver with Flash Timeout Protection

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN pin: Voltage to GND

7.5V

SW pin: Voltage to GND

21V

FB pin: Voltage to GND

7V

V

C pin: Voltage to GND

1.26V ± 0.3V

SD,T/F pins: Voltage to GND

7.5V

FET-T, FET-F: Voltage to GND

6V

Continuous Power Dissipation (Note 3) Internally Limited

Junction Temperature (T

J-MAX )

150˚C

Storage Temperature Range

-65˚C to +150

Maximum Lead Temperature

(Soldering)

(Note 4)

ESD Rating(Note 5)

Human Body Model

2.0kV

Operating Ratings(Notes 1, 2)

Input Voltage Range

2.7V to 5.5V

SW Voltage Max. (Note 6)

20V

Junction Temperature (T

J)

Range

-40˚C to +110˚C

Ambient Temperature (T

A)

Range (Note 7)

-40˚C to +85˚C

Thermal Properties

Junction-to-Ambient Thermal

Resistance (

θ

JA), SDA14B

Package (Note 8)

37.3˚C/W

ESD Caution Notice National Semiconductor recommends that all integrated circuits be handled with appropri-

ate ESD precautions. Failure to observe proper ESD handling techniques can result in damage to the device.

Electrical Characteristics(Notes 2, 9)

Limits in standard typeface are for T

J = +25˚ C. Limits in boldface type apply over the full operating junction temperature range

(-40˚C

≤ T

J

≤ +110˚C). Unless otherwise noted, specifications apply to the LM3551 and LM3552 Typical Application Circuit (pg.

1) with: V

IN = 3.6V, V(SD) = 0V for LM3551 and V(EN) = VIN for LM3552, ILOAD = 0A (Note 10)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

I

Q

Quiescent Current

FB = V

IN (Not Switching)

1.47

2.0

mA

I

SD

Shutdown Current

V(SD) = V

IN

LM3551

2.55

5.0

µA

V(EN) = 0V

LM3552

0.1

2.3

I

CL(Note 11)

Switch Current Limit

V

IN = 3.0V(Note 12)

2.1

A

V

FB

Feedback Voltage

1.2285

1.265

1.2915

V

I

FB(Note 13)

Feedback Pin Bias Current

50

nA

g

m

Error Amp

Transconductance

∆I = 5µA

135

µmho

A

V

Error Amp Voltage Gain

135

V/V

D

MAX

Maximum Duty Cycle

92.5

%

f

sw

Switching Frequency

0.9

1.25

1.6

MHz

I

SDPIN

Shutdown Pin Current

(LM3551)

V

SD = 0V

3.0

6

µA

I

ENPIN

Enable Pin Current

(LM3552)

V

EN = 3.6V

3.0

6

µA

I

T/FPIN

T/F Pin Current

V

T/F =0V

26

nA

V

T/F =VIN

22

I

L-SW

SW Pin Leakage Current

V

L-SW = 20V

0.07

8

µA

R

DSON-SW

SW Pin R

DSON

I

SW = 0.5A

0.165

Ω

I

L-T

FET-T Leakage Current

0.1

µA

R

DSON-T

FET-T R

DSON

0.98

Ω

I

L-F

FET-F Leakage Current

0.1

µA

R

DSON-F

FET-F R

DSON

0.36

Ω

Th

SD/EN

Shutdown/Enable Pin

Threshold

Output High

1.2

V

Output Low

0.3

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