IS31LT3135-V1GRLS2 Datasheet, PDF (1/6 Pages) Integrated Silicon Solution, Inc – MAIN/SUB DUAL-CHANNEL LED DRIVER

IS31LT3135
MAIN/SUB DUAL-CHANNEL LED DRIVER
GENERAL DESCRIPTION
IS31LT3135 is a main/sub dual-channel LED driver.
When the main channel works，it is a constant current
source driving the main LED and the current is set by
an external resistor connected to the I_SET pin. It needs
only 0.1v dropout voltage for 200mA output current.
When the sub-channel works, the chip will pull down
the sub LED’s cathode to ground.
Normally there is only one channel on, the main
channel and the sub channel can switch between each
other. Sweeping power supply from high voltage to low
voltage, main channel switches to sub-channel while
UV pin is below the undervoltage threshold 1.17V
(IS31LT3135-V1 typical) or 1.23V (IS31LT3135-V2
typical). Sweeping power supply from low voltage to
high voltage, the sub-channel switches to the main
channel while UV pin is 80mV (typical) higher than the
undervoltage threshold. Additionally, the main channel
has short protection function, when the main LED is
shorted，the chip will switch to sub-channel
automatically.
FEATURES
November 2011
 Power supply undervoltage detect
 Main channel short protection
 Over-temperature protection
 Input voltage range: 2.7V~5.5V
 Main and sub-channel current set by external
resistor
 Main channel Vdp=0.1V
 Low quiescent current
 Assembled in SOP-8 package
APPLICATIONS
 Miner lamp
 Other LED lighting
TYPICAL APPLICATION CIRCUIT
IS31LT3135
Figure 1
.
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time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
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product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
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1
Rev.A, 11/08/2011