Features: ` Built-In Open Circuit Protection` Over Voltage Protection` Efficiency Up to 84% at VIN=4.2V, 3LEDs, ILED=20mA` 1.2MHz Fixed Switching Frequency` Drives Up to 5LEDs in series` Low Supply Current: 70A` Matches LED Curr...
AIC1648: Features: ` Built-In Open Circuit Protection` Over Voltage Protection` Efficiency Up to 84% at VIN=4.2V, 3LEDs, ILED=20mA` 1.2MHz Fixed Switching Frequency`...
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Input Voltage (VIN)............. .... 6V
SW Voltage .....................33V
FB Voltage 6V SHDNVoltage .............6V
SHDNVoltage ....................6V
OVP Voltage................ .... 34V
Operating Temperature Range ... .40°C to 85°C
Maximum Junction Temperature .........125°C
Storage Temperature Range .....65°C to 150°C
Lead Temperature (Soldering, 10 sec) ......260°C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
AIC1648 is a fixed frequency step-up DC/DC converter designed to drive white LEDs with a constant current to provide backlight in hand-held devices. Series connection of LEDs provides identical LED currents resulting in uniform brightness. This configuration eliminates the need of ballast resistors. The built-in open load protection prevents the damage resulting from an open circuit condition. Low 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.
AIC1648 is a step-up PWM converter, which includes an internal N-channel MOSFET switch for high efficiency. The high switching frequency, 1.2MHz, allows the use of tiny external components.
AIC1648 is available in a space-saving, 6-lead SOT-23-6 package.