LM3544 datasheet(3/13 Pages) NSC

3 / 13 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.

Voltage at IN

X and OUTX pins

−0.3V to 6V

Voltage at EN

X(ENX) and FLAGX

pins

−0.3V to 5.5V

Power Dissipation

(Note 2)

Internally Limited

Maximum Junction Temperature

150˚C

Storage Temperature Range

−65˚C to 150˚C

Lead Temperature Range

(Soldering, 5 sec.)

260˚C

ESD Rating (Note 3)

2 kV

Operating Ratings

Supply Voltage Range

2.7V to 5.5V

Continuous Output Current Range

(Each Output)

0 mA to 500 mA

Junction Temperature Range

−40˚C to 125˚C

DC Electrical Characteristics

Limits in standard typeface are for T

J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: V

IN = 5.0V, ENX =VIN (LM3544-H) or ENX = 0V (LM3544-L).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

On Resistance

IN = 5V, IOUTX = 0.5A

125

Ω

IN = 3.3V, IOUTX = 0.5A

130

OUT

X Continuous Output

Current

3.0V

≤ V

IN ≤ 5.5V

0.5

LEAK-OUT

OUT

X Leakage Current

X = 0 (ENX =VIN);

J = 25˚C

0.01

µA

X = 0 (ENX =VIN);

−40

≤ T

J ≤ 125˚C

µA

OUT

X Short-Circuit Current

(Note 4)

OUT

X Connected to GND

0.8

1.25

THRESH

Overcurrent Threshold

2.0

3.2

L_FLAG

FLAG

X Output-Low Voltage

I(FLAG

X)=10 mA

0.1

0.3

LEAK-FLAG

FLAG

X Leakage Current

2.7

≤ V

FLAG ≤ 5.5V

0.2

µA

LEAK-EN

x Input Leakage Current

x/ENx =0Vor

x/ENx =VIN

−0.5

0.5

µA

EN/EN Input Logic High

2.7V

≤ V

IN ≤ 5.5V

2.4

EN/EN Input Logic Low

4.5V

≤ V

IN ≤ 5.5V

0.8

2.7V

≤ V

IN ≤ 4.5V

0.4

UVLO

Under-Voltage Lockout

Threshold

1.8

DDON

Operational Supply Current

x =VIN (ENx =0);

J = 25˚C

375

600

µA

x =VIN (ENx =0);

−40˚C

≤ T

J ≤ 125˚C

800

µA

DDOFF

Shutdown Supply Current

x = 0 (ENx =VIN);

J = 25˚C

1µA

−40˚C

≤ T

J ≤ 125˚C

µA

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device

beyond its rated operating conditions.

Note 2: The maximum allowable power dissipation is a function of the Maximum Junction Temperature (TJMAX), Junction to Ambient Thermal Resistance (θJA), and

the Ambient Temperature (TA). The LM3544 in the 16-pin SOIC package has a TJMAX of 150˚C and a θJA of 130˚C/W. The maximum allowable power dissipation

at any temperature is PMAX =(TJMAX −TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the part will go into

thermal shutdown.

Note 3: The Human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin.

Note 4: Thermal Shutdown will protect the device from permanent damage.

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