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PDF LM3503 Data sheet ( Hoja de datos )
| Número de pieza | LM3503 | |
| Descripción | Dual-Display Constant Current LED Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM3503 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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www.DataSheet4U.com
July 2005
LM3503
Dual-Display Constant Current LED Driver with Analog
Brightness Control
General Description
The LM3503 is a white LED driver for lighting applications.
For dual display backlighting applications, the LM3503 pro-
vides a complete solution. The LM3503 contains two internal
white LED current bypass FET (Field Effect Transistor)
switches. The white LED current can be adjusted with a DC
voltage from a digital to analog converter or RC filtered PWM
(pulse-width-modulated) signal at the Cntrl pin.
With no external compensation, cycle-by-cycle current limit,
output over-voltage protection, input under-voltage protec-
tion, and dynamic white LED current control capability, the
LM3503 offers superior performance over other step-up
white LED drivers.
Features
n Drives up to 4, 6, 8 or 10 White LEDs for Dual Display
Backlighting
n >80% Peak Efficiency
n Output Voltage Protection Options: 16V, 25V, 35V & 44V
n Input Under-Voltage Protection
n Internal Soft Start Eliminates Inrush Current
n 1 MHz Constant-Switching Frequency
n Analog Brightness Control
n Wide Input Voltage Range: 2.5V to 5.5V
n Low Profile Packages: <1 mm Height
— 10 Bump MicroSMD
— 16 Pin LLP
Applications
n Dual-Display Display Backlighting in Portable devices
n Cellular Phones and PDAs
Typical Application
© 2005 National Semiconductor Corporation DS201286
20128662
www.national.com
1 page  
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN Pin
Sw Pin
Fb Pin
Cntrl Pin
VOUT1Pin
VOUT2 Pin
En1
En2
Continuous Power Dissipation
Maximum Junction Temperature
(TJ-MAX)
Storage Temperature Range
−0.3V to +5.5V
−0.3V to +48V
−0.3V to +5.5V
−0.3V to +5.5V
−0.3V to +48V
−0.3V to VOUT1
−0.3V to +5.5V
−0.3V to +5.5V
Internally Limited
+150˚C
−65˚C to +150˚C
ESD Rating (Note 2)
Human Body Model:
Machine Model:
2 kV
200V
Operating Conditions (Notes 1, 6)
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
Supply Voltage, VIN Pin
En1 and En2 Pins
Cntrl Pin
−40˚C to +125˚C
−40˚C to +85˚C
2.5V to 5.5V
0V to 5.5V
0V to 3.5V
Thermal Properties (Note 4)
Junction-to-Ambient Thermal Resistance (θJA)
Micro SMD Package
Leadless Leadframe Package
65˚C/W
49˚C/W
Electrical Characteristics (Notes 6, 7) Limits in standard typeface are for TJ = +25˚C. Limits in bold type-
face apply over the full operating junction temperature range (−40˚C ≤ TJ ≤ +125˚C). Unless otherwise specified,VIN = 2.5V.
Symbol
VIN
IQ
VFb
ICL
IFb
FS
RDS(ON)
RPDS(ON)
RNDS(ON)
DMAX
ICNTRL
ISw
IVOUT1(OFF)
Parameter
Conditions
Input Voltage
Non-Switching
Cntrl = 1.6V
Switching
Fb = 0V, Sw Is Floating
Shutdown
En1 = En2 = 0V
Feedback Voltage
Cntrl = 3.5V
NMOS Power Switch 16, Fb = 0V
Current Limit
25, Fb = 0V
35, Fb = 0V
44,FB = 0V
Feedback Pin Output Fb = 0.25V, Cntrl = 1.6V
Bias Current
Switching Frequency
NMOS Power Switch ISw = 500 mA, (Note 8)
ON Resistance
(Figure 1: N1)
PMOS ON Resistance IPMOS = 20 mA, En1 = 0V, En2 = 1.5V
Of VOUT1/VOUT2
Switch (Figure 1: P1)
NMOS ON Resistance INMOS = 20 mA, En1 = 1.5V, En2 = 0V
Of VOUT2/Fb Switch
(Figure 1: N2)
Maximum Duty Cycle Fb = 0V
Cntrl Pin Bias Current Cntrl = 2.5V
(Note 3)
Cntrl = 0V
Sw Pin Leakage
Sw = 42V, En1 = En2 =0V
Current (Note 3)
VOUT1 Pin Leakage
Current (Note 3)
VOUT1 = 14V, En1 = En2 = 0V (16)
VOUT1 = 23V, En1 = En2 = 0V (25)
VOUT1 = 32V, En1 = En2 = 0V (35)
VOUT1 = 42V, En1 = En2 = 0V (44)
Min Typ Max
2.5 5.5
0.5 1
1.9 3
0.1 3
0.5 0.55
0.6
250 400
400 600
650
800
450 750 1050
450 750 1050
64 500
0.8 1
1.2
0.55
1.1
Units
V
mA
mA
µA
V
mA
nA
MHz
Ω
5 10
Ω
2.5
90 95
8
0.1
0.01
0.1
0.1
0.1
0.1
5
14
5
3
3
3
3
Ω
%
µA
µA
µA
5 www.national.com
5 Page 
Typical Performance Characteristics (See Typical Application Circuit : L=DO1608C-223 and
D=B150-13. Efficiency: η = POUT/ PIN = [(VOUT – VFb ) * IOUT] / [VIN * IIN]. TA = +25˚C, unless otherwise stated.) (Continued)
VOUT1 Pin Current vs VOUT1Pin Voltage
Power NMOS RDS(ON) (Figure 1: N1) vs VIN
20128618
NMOS RDS(ON) (Figure 1: N2) vs VIN
20128619
PMOS RDS(ON) (Figure 1: P1) vs VIN
20128620
Feedback Voltage vs Cntrl Pin Voltage
20128621
Current Limit (LM3503-16) vs Temperature
20128622
11
20128655
www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM3503.PDF ] | |
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