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LM3503 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3503
Description  Dual-Display Constant Current LED Driver with Analog Brightness Control
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM3503 Datasheet(HTML) 5 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 +5.5V
Sw Pin
−0.3V to +48V
Fb Pin
−0.3V to +5.5V
Cntrl Pin
−0.3V to +5.5V
V
OUT1Pin
−0.3V to +48V
V
OUT2 Pin
−0.3V to V
OUT1
En1
−0.3V to +5.5V
En2
−0.3V to +5.5V
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
200V
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
2.5V to 5.5V
En1 and En2 Pins
0V to 5.5V
Cntrl Pin
0V to 3.5V
Thermal Properties (Note 4)
Junction-to-Ambient Thermal Resistance (
θ
JA)
Micro SMD Package
65˚C/W
Leadless Leadframe Package
49˚C/W
Electrical Characteristics (Notes 6, 7) 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 = 2.5V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IN
Input Voltage
2.5
5.5
V
I
Q
Non-Switching
Switching
Shutdown
Cntrl = 1.6V
Fb = 0V, Sw Is Floating
En1=En2=0V
0.5
1.9
0.1
1
3
3
mA
mA
µA
V
Fb
Feedback Voltage
Cntrl = 3.5V
0.5
0.55
0.6
V
I
CL
NMOS Power Switch
Current Limit
16, Fb = 0V
25, Fb = 0V
35, Fb = 0V
44,FB = 0V
250
400
450
450
400
600
750
750
650
800
1050
1050
mA
I
Fb
Feedback Pin Output
Bias Current
Fb = 0.25V, Cntrl = 1.6V
64
500
nA
F
S
Switching Frequency
0.8
1
1.2
MHz
R
DS(ON)
NMOS Power Switch
ON Resistance
(Figure 1: N1)
I
Sw = 500 mA, (Note 8)
0.55
1.1
R
PDS(ON)
PMOS ON Resistance
Of V
OUT1/VOUT2
Switch (Figure 1: P1)
I
PMOS = 20 mA, En1 = 0V, En2 = 1.5V
5
10
R
NDS(ON)
NMOS ON Resistance
Of V
OUT2/Fb Switch
(Figure 1: N2)
I
NMOS = 20 mA, En1 = 1.5V, En2 = 0V
2.5
5
D
MAX
Maximum Duty Cycle
Fb = 0V
90
95
%
I
CNTRL
Cntrl Pin Bias Current
(Note 3)
Cntrl = 2.5V
Cntrl = 0V
8
0.1
14
µA
I
Sw
Sw Pin Leakage
Current (Note 3)
Sw = 42V, En1 = En2 =0V
0.01
5
µA
I
VOUT1(OFF)
V
OUT1 Pin Leakage
Current (Note 3)
V
OUT1 = 14V, En1 = En2 = 0V (16)
V
OUT1 = 23V, En1 = En2 = 0V (25)
V
OUT1 = 32V, En1 = En2 = 0V (35)
V
OUT1 = 42V, En1 = En2 = 0V (44)
0.1
0.1
0.1
0.1
3
3
3
3
µA
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