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LM3501TL-16 |LM3501TL16NATIONALN/a3000avaiSynchronous Step-up DC/DC Converter for White LED Applications
LM3501TL-16 |LM3501TL16NSN/a250avaiSynchronous Step-up DC/DC Converter for White LED Applications
LM3501TL-16 |LM3501TL16NSCN/a52avaiSynchronous Step-up DC/DC Converter for White LED Applications
LM3501TLX-16 |LM3501TLX16NSC N/a5500avaiSynchronous Step-up DC/DC Converter for White LED Applications


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LM3501TL-16-LM3501TLX-16
Synchronous Step-up DC/DC Converter for White LED Applications
LM3501
Synchronous Step-up DC/DC Converter for White LED
Applications
General Description

The LM3501isa fixed frequency synchronous step-up
DC/DC converterina small 8-bump thin micro SMD pack-
age. The LM3501is idealfor white LED applicationsfor
cellular phone back-lighting requiring low current and high
efficiency.Its fixed 1MHz operating frequency allowsthe use small, low ESR capacitorsas wellasa more predictable
frequency spectrum, whichis importantin cellular phone
applications. The LM3501 can drive2to4 white LEDsin
series froma single Li-Ion batteryor3 cell NiMH withno
external rectification diode. For white LED applications,a
single external resistoris usedto set the maximum LED
current. The white LED current can easilybe adjusted using external voltage signal froma DACor micro-controller.
The LM3501 uses special protection circuitryonthe output preventan overvoltage eventif the primary white LED
network shouldbe disconnected eliminating the needofan
extra protection Zener diode.In shutdown,the LM3501 dis-
connects the input and output creatinga true isolation pre-
venting any LED light from emitting over thefull input oper-
ating voltage range and temperature.
Features
Synchronous rectification, high efficiency andno
external schottky diode required Uses small surface mount components Can driveupto3(or4 low VF) white LEDsin series 2.7Vto7V input range True shutdown isolation,no LED leakage current DC voltage LED current control Input undervoltage lockout Output overvoltage protection,no external zener diode
required Requires onlya small 16V ceramic capacitorat the
output Thermal Shutdown 0.1µA shutdown current Small 8-bump thin micro SMD package
Applications
LCD Bias Supplies White LED Back-Lighting Handheld Devices Digital Cameras Portable Applications
Typical Application Circuit

FIGURE1. Typical3 LED Application
February 2005
Synchronous
Step-up
DC/DC
Converter
for
White
LED
Applications
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