Datasheet

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 OUT
X
pins −0.3V to 6V
Voltage at EN
X
(EN
X
) and FLAG
X
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, EN
X
=V
IN
(LM3544-H) or EN
X
= 0V (LM3544-L).
Symbol Parameter Conditions Min Typ Max Units
R
ON
On Resistance
V
IN
= 5V, I
OUTX
= 0.5A 90 125
mΩ
V
IN
= 3.3V, I
OUTX
= 0.5A 95 130
I
OUT
OUT
X
Continuous Output
Current
3.0V ≤ V
IN
≤ 5.5V 0.5 A
I
LEAK-OUT
OUT
X
Leakage Current EN
X
= 0 (EN
X
=V
IN
);
T
J
= 25˚C
0.01 1 µA
EN
X
= 0 (EN
X
=V
IN
);
−40≤ T
J
≤ 125˚C
10 µA
I
SC
OUT
X
Short-Circuit Current
(Note 4)
OUT
X
Connected to GND 0.8 1.25 A
OC
THRESH
Overcurrent Threshold 2.0 3.2 A
V
L_FLAG
FLAG
X
Output-Low Voltage I(FLAG
X
)=10mA 0.1 0.3 V
I
LEAK-FLAG
FLAG
X
Leakage Current 2.7 ≤ V
FLAG
≤ 5.5V 0.2 1 µA
I
LEAK-EN
EN
x
Input Leakage Current EN
x
/EN
x
=0Vor
EN
x
/EN
x
=V
IN
−0.5 0.5 µA
V
IH
EN/EN Input Logic High 2.7V ≤ V
IN
≤ 5.5V 2.4 V
V
IL
EN/EN Input Logic Low 4.5V ≤ V
IN
≤ 5.5V 0.8 V
2.7V ≤ V
IN
≤ 4.5V 0.4 V
V
UVLO
Under-Voltage Lockout
Threshold
1.8 V
I
DDON
Operational Supply Current
EN
x
=V
IN
(EN
x
=0);
T
J
= 25˚C
375 600 µA
EN
x
=V
IN
(EN
x
=0);
−40˚C ≤ T
J
≤ 125˚C
800 µA
I
DDOFF
Shutdown Supply Current
EN
x
= 0 (EN
x
=V
IN
);
T
J
= 25˚C
1µA
−40˚C ≤ T
J
≤ 125˚C 5 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 (T
JMAX
), Junction to Ambient Thermal Resistance (θ
JA
), and
the Ambient Temperature (T
A
). The LM3544 in the 16-pin SOIC package has a T
JMAX
of 150˚C and a θ
JA
of 130˚C/W. The maximum allowable power dissipation
at any temperature is P
MAX
=(T
JMAX
−T
A
)/θ
JA
. 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 kΩ resistor into each pin.
Note 4: Thermal Shutdown will protect the device from permanent damage.
LM3544
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