Step-Up DC/DC Converter for White LED Backlight Applications

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Manufacturer Skyworks


Description :

The AAT1231/1231-1 are high frequency, high efficiency constant current boost converters capable of 24V maximum output voltage. Both devices are ideal power solutions for backlight applications with up to six white LEDs in series or up to twelve white LEDs in a parallel/series configuration. The input voltage is 2.7V to 5.5V for single-cell lithium-ion/polymer (Li-ion) based portable devices. The LED current is digitally controlled across a 6x operating range using AnalogicTech's Simple Serial Control™ (S²Cwire™) interface. Programmability across 26 discrete current steps provides high resolution, low noise, flicker-free, constant LED outputs. In programming AAT1231 operation, LED brightness increases based on the data received at the EN/SET pin. In programming AAT1231-1 operation, brightness decreases based on the data received at the EN/SET pin. The SEL logic pin changes the feedback voltage between two programmable ranges. The AAT1231 and the AAT1231-1 feature high current limit and fast, stable transitions for stepped or pulsed current applications. The high switching frequency (up to 2MHz) provides fast response and allows the use of ultra-small external components, including chip inductors and capacitors. Fully integrated control circuitry simplifies design and reduces total solution size. The AAT1231 and the AAT1231-1 offer a true load disconnect feature which isolates the load from the power source while in the OFF or disabled state. This eliminates leakage current, making the devices ideally suited for battery-powered applications. The AAT1231 and the AAT1231-1 are available in Pb-free, thermally-enhanced 12-pin TSOPJW packages.

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    • Input Voltage Range: 2.7V to 5.5V
    • Maximum Continuous Output 24V @ 50mA
    • Drives 6 LEDs in Series, 12 LEDs in Parallel / Series Configuration
    • Constant LED Current with 6% Accuracy
    • Digital Control with S2Cwire Single Wire Interface
    • 26 Discrete Steps
    • No PWM Control Required
    • No Additional Circuitry
    • Up to 82% Efficiency
    • Up to 2MHz Switching Frequency Allows Small External Chip Inductor and Capacitors
    • Hysteretic Control
    • No External Compensation Components
    • Excellent Load Transient Response
    • High Efficiency at Light Loads
    • Integrated Soft Start with No External Capacitor
    • True Load Disconnect Guarantees <1.0μA Shutdown Current
    • Selectable Feedback Voltage Ranges for High Resolution Control of Load Current
    • Short-Circuit, Over-Voltage, and Over-Temperature Protection
    • 12-Pin TSOPJW Package
    • -40°C to +85°C Temperature Range

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Control scheme Current Mode Control  

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Switching frequency (kHz) 2000  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 24  
Typ. Active Current (µA) 40  
Output Capacitor Type 2.2 to 4.7 μF, Ceramic Capacitors  
Output Current (mA) 50  
Operating Temperature (°C) -40 to +85  
Package TSOPJW-12