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LM3520 Datasheet(Hoja de datos) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de Pieza. LM3520
Descripción  Integrated White LED Driver with Organic LED Display Power Supply
Descarga  14 Pages
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Fabricante  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
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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
−0.3V to +7.5V
V
O_MAIN
−0.3V to +25V
V
SW
−0.3V to V
OUT
+0.3V
Main_FB, Main_RTN
−0.3V to +7.5V
MAIN_EN, PFM_EN &
SUB_EN(Note 2)
−0.3V to +7.5V
Continuous Power Dissipation
(Note 3)
Internally Limited
Maximum Junction Temperature
(T
J-MAX)
+150˚C
Storage Temperature Range
−65˚C to +150˚C
Maximum Lead Temperature
(Soldering, 10 sec)
+265˚C
ESD Rating (Note 4)
Human Body Model:
Machine Model:
2.0 kV
200V
Operating Ratings
Input Voltage Range
2.7V to 5.5V
Junction Temperature (T
J) Range
−40˚C to +125˚C
Ambient Temperature (T
A) Range
(Note 3)
−40˚C to +85˚C
Thermal Properties
Junction-to-Ambient Thermal Resistance (
θ
JA),
55˚C/W
Leadless Lead frame Package (Note 5)
Electrical Characteristics (Notes 6, 7) 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
≤ +125˚C). Unless otherwise noted: specifications
apply to the LM3520. V
IN = 3.6V, V(En) > 1.0V, CIN = 10 µF (Note 8).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Enable
Threshold
MAIN_EN = low
SUB_EN = low
0.3
V
MAIN_EN = high
SUB_EN = high
0.95
PFM_EN = low
0.3
V
PFM_EN = high
0.95
I
EN
Enable Pin Current
MAIN_EN = 3.6V (Note 10)
3
5
µA
SUB_EN = 3.6V (Note 10)
3
5
PFM_EN = 3.6V
3
5
I
Q
Quiescent Current, Device Not
Switching (PWM mode)
MAIN_FB > 0.5V
0.5
1.3
mA
Quiescent Current, Device Not
Switching (PFM mode)
SUB_FB > 1.0V
0.25
0.45
Quiescent Current, Device
Switching
MAIN_FB = 0V or SUB_FB =
0V (open loop)
1.75
4.5
Power Off Current (Shutdown)
MAIN_EN = low
SUB_EN = low
PFM_EN = low
0.1
2
µA
V
FB
Feedback Voltage (MAIN_FB)
V
IN = 3.6V
0.455
0.5
0.545
V
Feedback Voltage (SUB_FB)
V
IN = 3.6V
1.18
1.23
1.28
I
B
FB Pin Leakage Current
MAIN_FB = 0.5V (Note 9)
10
nA
FB Pin Bias Current
SUB_FB = 1.0V (Note 9)
50
I
Current Limit
Switch Current Limit
V
MAIN_FB = 0V, VIN = 3.6V
0.518
0.7
0.917
A
R
DS(ON)
Main_Switch R
DS(ON), N1
I
SW = 300 mA
0.5
PMOS Switch R
DS(ON), P1
I
PMOS =20mA
3
MAIN_RTN R
DS(ON), N2
I
Main_RTN =30mA
3
I
main_RTN_leakage
Main_RTN Leakage Current
V
Main_RTN = 0.5V, VIN = 3.6V
0.2
µA
D
Limit
Duty Cycle Limit at PWM & PFM
V
FB = 0V, VIN = 3.6V
90
%
F
SW
Switching Frequency
V
IN = 3.6V
0.8
1.1
1.4
MHz
I
Leak
Switch Leakage Current
V
SW = 24V
0.01
0.5
µA
www.national.com
5




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