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LM3557 Datasheet(Fiches technique) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM3557
Description  Step-Up Converter for White LED Applications
Télécharger  11 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3557 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN Pin
?0.3V to +8V
En Pin
?0.3V to +8V
Fb Pin
?0.3V to +8V
Sw2 Pin
?0.3V to +8V
Ovp Pin
?0.3V to +30V
Sw1 Pin
?0.3V to +40V
Continuous Power Dissipation
Internally Limited
Maximum Junction Temperature
(T
J-MAX)
+150?C
Storage Temperature Range
?65?C to +150?C
ESD Rating (Note 2)
Human Body Model
Machine Model
2kV
150V
Operating Conditions (Notes 1, 6)
Junction Temperature (T
J) Range
?40?C to +125?C
Ambient Temperature (T
A) Range
?40?C to +85?C
Supply Voltage, V
IN Pin
2.7V to 7.5V
En Pin
0V to V
IN +0.4V
Thermal Properties (Notes 4, 7)
Junction-to-Ambient Thermal
55?C/W
Resistance (
?
JA), Leadless Leadframe Package
Electrical Characteristics (Notes 6, 8) Limits in standard typeface are for T
J = 25?C. Limits in bold type-
face apply over the full operating junction temperature range (?40?C
? T
J
? +125?C). Unless otherwise specified: V
IN = 3.6V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IN
Input Voltage
2.7
7.5
V
I
Q
Quiescent Current
V
EN = 0V (Shutdown)
V
EN = 1.8V; VOVP = 27V
(Non-Switching)
0.01
0.55
2
0.8
A
mA
En
Device Enable Threshold
Device On
Device Off
0.9
0.3
V
I
CL
Power Switch Current Limit
(Note 10)
V
IN =3V
0.4
0.55
0.8
0.8
1.1
1.02
A
R
DS(ON)
Power Switch ON Resistance
I
Sw1 = 175 mA
800
1000
m
?
TC
(R
DS(ON))
R
DS(ON) Temperature
Coefficient
0.5
%/C
OVP
Over-Voltage Protection (Note
5)
On Threshold
Off Threshold
22
21.5
26
25.5
28.5
28
V
UVP
Under-Voltage Protection (Note
5)
On Threshold
Off Threshold
2.2
2.3
V
I
OVP
Over-Voltage Protection Pin
Bias Current (Note 3)
4
10
A
I
EN
Enable Pin Bias Current (Note
3)
V
EN = 1.8V
0.8
3
A
F
S
Switching Frequency
V
IN =3V
0.9
1.25
1.6
MHz
V
Fb-Sw2
Feedback Pin Voltage (Note 9)
0.459
0.51
0.561
V
I
Fb
Feedback Pin Bias Current
(Note 3)
0.03
2
A
D
MAX
Maximum Duty Cycle
V
IN =3V
85
90
%
I
LSw1
Sw1 Pin Leakage Current (Note
3)
V
Sw1 = 3.6V, Not Switching
0.002
2
A
I
LSw2
Sw2 Pin Leakage Current (Note
3)
V
Sw2 = 3.6V, Not Switching
0.001
1
A
I
LOVP
Ovp Pin Leakage Current (Note
3)
V
Ovp = 3.6V, Not Switching
2nA
R
Sw2
Sw2 Pin Switch Resistance
I
Sw2 =50mA
8
10
?
TC(R
Sw2)RSw2 Temperature Coefficient
0.5
%/C
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical characteristic specifications do not apply when
operating the device outside of its rated operating conditions.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 k
? resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
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