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LM3552 Folha de dados(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM3552
Descrição Electrónicos  1A White LED Driver with Flash Timeout Protection
Download  15 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3552 Folha de dados(HTML) 3 Page - National Semiconductor (TI)

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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
I
L-T
FET-T Leakage Current
0.1
µA
R
DSON-T
FET-T R
DSON
0.98
I
L-F
FET-F Leakage Current
0.1
µA
R
DSON-F
FET-F R
DSON
0.36
Th
SD/EN
Shutdown/Enable Pin
Threshold
Output High
1.2
V
Output Low
0.3
www.national.com
3


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