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LM3502SQ-25NOPB Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części LM3502SQ-25NOPB
Szczegółowy opis  Step-Up Converter for White LED Applications
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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LM3502SQ-25NOPB Arkusz danych(HTML) 1 Page - Texas Instruments

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LM3502-44
VIN
Sw
En1
En2
Fb
Cntrl
AGND
PGND
VOUT1
VOUT2
L
22 PH
D
CIN
4.7 PF
COUT
1 PF
R1
VSUPPLY
MAIN:
2 to 5
LEDs
SUB:
2 to 5
LEDs
Logic
Voltage
Signal
Inputs
LM3502
www.ti.com
SNVS339A – SEPTEMBER 2005 – REVISED AUGUST 2006
LM3502 Step-Up Converter for White LED Applications
Check for Samples: LM3502
1
FEATURES
Wide Input Voltage: 2.5V to 5.5V
Small External Components
2
Drive up to 4, 6, 8 or 10 White LEDs for Dual
Display Backlighting
Low Profile Packages: <1 mm Height
>80% Efficiency
10 Bump DSBGA
Output Voltage Options: 16V , 25V , 35V, and
16 Pin WQFN
44V
APPLICATIONS
Input Under-Voltage Protection
Internal Soft Start Eliminating Inrush Current
Dual Display Backlighting in Portable Devices
1 MHz Constant Switching Frequency
Cellular Phones and PDAs
DESCRIPTION
The LM3502 is a white LED driver for lighting applications. For dual display or large single white LED string
backlighting applications, the LM3502 provides a complete solution. The LM3502 contains two internal white LED
current bypass FET(Field Effect Transistor) switches that are ideal for controlling dual display applications. The
white LED current can be adjusted with a PWM signal directly from a microcontroller without the need of an RC
filter network.
With no external compensation, cycle-by-cycle current limit, over-voltage protection, and under-voltage
protection, the LM3502 offers superior performance over other application specific standard product step-up
white LED drivers.
Typical Application
Figure 1. Blacklight Configuration with 10 White LEDs
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005–2006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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