LED BACKLIGHT DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
A8169-020
LED BACKLIGHT DRIVER PFM/PWM MODE MAX. 3MHZ, VARIABLE FREQUENCY
DESCRI...
Description
AiT Semiconductor Inc.
www.ait-ic.com
A8169-020
LED BACKLIGHT DRIVER PFM/PWM MODE MAX. 3MHZ, VARIABLE FREQUENCY
DESCRIPTION
FEATURES
The A8169-020 variable frequency step-up Converter Up to 19V Output Voltage
drives white LEDs with a constant current to provide Wide Operation Range: 2V to 6V
backlight in cell phones, PDAs, and other hand-held Maximum 3MHz Operating Frequency
devices. It features allowing series connection of the PWM Dimming Control
white LEDs so that the LED currents are identical for Shutdown Current <1uA
uniform brightness. An enable input can be pulsed Current Limit Cycle-by-Cycle
repeatedly to adjust LEDs brightness. The fast 3MHz Low Current Sense Threshold: 200mV
operation frequency allows for smaller capacitor and 19V Over Output Voltage Protection
inductor. Fault condition protection uses cycle-by cycle Available in SOT-26 package
current limiting to sense maximum inductor current and
over-voltage protection. The 0.2V low reference voltage
APPLICATIONS
minimized the power loss across the current sense
resistor.
Compact Back Light Module
The converter can operate from 2V to 6V, and capable of Power Source for LED
delivering maximum 250mA output current at 4-LEDs Constant Current Source
application with 3V input voltage. Quiescent current
drawn from power source is as low as 120uA. All of these
ORDERING INFORMATION
features make A8169-020 be suitable for the portable
devices, which are supplied by a single ba...
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