LM3519 datasheet(3/14 Pages) NSC

3 / 14 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

IN , En, & LED_rtn Pin

−0.3V to +6.5V

OUT , Sw Pin

−0.3V to +21V

Maximum Junction Temperature

J-MAX)

+150˚C

Storage Temperature Range

−65˚C to +150˚C

ESD Rating (Note 2)

Human Body Model:

Machine Model:

2kV

200V

Operating Ratings

Junction Temperature (T

J) Range

−40˚C to +125˚C

Ambient Temperature (T

A) Range

−40˚C to +85˚C

Input Voltage Range

2.7V to 5.5V

Thermal Properties (Note 4)

Junction-to-Ambient Thermal Resistance (

JA)

220˚C/W

Electrical Characteristics (Note 5) Limits in standard typeface are for T

J = +25˚C. Limits in bold typeface

apply over the full operating junction temperature range (−40˚C

≤ T

≤ +125˚C). V

IN = 3.6V, unless otherwise stated.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Supply Current

Shutdown: V

EN = 0V

0.1

µA

Not Switching: V

EN = 1.8V

360

500

Switching: V

EN = 1.8V,

LED_rtn current = 30mA

550

900

LED(TOL)

LED Current

Tolerance/Variation

IN = 3.6V, 2.2µH,

4LEDs

–10

5.5

OVP

Over-Voltage Protection

Threshold

OVP ON

OVP OFF

17.8

18.9

18.6

19.8

LIM

Switch Current Limit

L = 2.2µH

750

DS(ON)

Power NMOS Switch ON

Resistance

455

Ω

LEAKAGE

Switch Leakage

SW = 3.6V, VEN = 0V

0.1

µA

LED_rtn(ON)

LED_rtn NMOS Switch

ON Resistance

8.0

Ω

Switching Frequency

LED =20mA,L=1µH

4LEDs

5.4

MHz

Enable Pin Bias Current

(Note 3)

EN =0V

EN = 1.8V

0.1

1.1

µA

Enable Threshold

Device On

Device Off

0.9

0.3

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the

device is guaranteed. Operating Ratings do not imply guaranteed limits. For guaranteed performance limits and associated test conditions, see the Electrical

Characteristics table.

Note 2: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin. The machine model is a 200pF capacitor discharged directly

into each pin.

Note 3: Current flows into the pin.

Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA,

and the ambient temperature, TA. See Thermal Properties for the thermal resistance. The maximum allowable power dissipation at any ambient temperature is

calculated using: PD(MAX) = (TJ(MAX) – TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature.

Note 5: Min and max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.

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