LM3410_08 Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – PowerWise® 525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver with Internal Compensation

January 23, 2008
LM3410
PowerWise^® 525kHz/1.6MHz, Constant Current Boost and
SEPIC LED Driver with Internal Compensation
General Description
The LM3410 constant current LED driver is a monolithic, high
frequency, PWM DC/DC converter in 5-pin SOT23, 6-pin LLP,
& 8-pin eMSOP packages. With a minimum of external com-
ponents the LM3410 is easy to use. It can drive 2.8A typical
peak currents with an internal 170 mΩ NMOS switch. Switch-
ing frequency is internally set to either 525 kHz or 1.60 MHz,
allowing the use of extremely small surface mount inductors
and chip capacitors. Even though the operating frequency is
high, efficiencies up to 88% are easy to achieve. External
shutdown is included, featuring an ultra-low standby current
of 80 nA. The LM3410 utilizes current-mode control and in-
ternal compensation to provide high-performance over a wide
range of operating conditions. Additional features include
dimming, cycle-by-cycle current limit, and thermal shutdown.
Features
■ ^{Space Saving SOT23-5 & 6-LLP Package}
■ ^{Input voltage range of 2.7V to 5.5V}
■ ^{Output voltage range of 3V to 24V}
■ ^{2.8A Typical Switch Current}
■ ^{High Switching Frequency}
— 525 KHz (LM3410-Y)
— 1.6 MHz (LM3410-X)
■ ^{170 mΩ NMOS Switch}
■ ^{190 mV Internal Voltage Reference}
■ ^{Internal Soft-Start}
■ ^{Current-Mode, PWM Operation}
■ ^{Thermal Shutdown}
Applications
■ ^{LED Backlight Current Source}
■ ^{LiIon Backlight OLED & HB LED Driver}
■ ^{Handheld Devices}
■ ^{LED Flash Driver}
Typical Boost Application Circuit
30038501
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