Integrated White LED Drivers

Page Contents:   [ Featured Products | Datasheets | Application Notes | Buy Now ]

The AME5134/36/42 are dedicated for the drive of white LEDs.

The AME5134 drives white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs and other handheld devices. The step-up converter includes an internal 30V, low RDSON, N-channel MOSFET switch for high efficiency and maximum battery life.

To control LED brightness, the LED current can be pulsed by applying a single analog/PWM signal with a frequency range of 100Hz to 10kHz to the control pin (CTRL). A separate enable input provides on/off control. Soft-start minimizes inrush current during start up.

The AME5136 is a dual boost DC-to-DC converter, designed to drive up to 4 white LEDs with a constant current and to power an organic LED display with a constant voltage. According to SEL pin status, the AME5136 can either regulate output current flowing through series connected LEDs or regulate output voltage applying to OLED. A single external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal to the EN pin. Pulling the EN pin to GND disables the chip and reduces the supply current to less than 1uA. Additional features include a low-side NFET switch that can turn off the LED string with no DC current path to ground. Other features include OVP, OCP, UVP and OTP achieves ideal current matching of the LEDs to provide uniform lighting.

AME5142 is a fully integrated white LED boost converter that drive up to six white LEDs in series to simplify and miniaturize color LCD display illumination used in digital cameras, cell phones and PDAs.

A series configured array of white LEDs is currently considered the most effective backlighting solution for the design of color LCD displays because this architecture achieves ideal current matching of the LEDs to provide uniform lighting.

The devices operate as a DC-to-DC boost converter that regulates the current through the LED string. Dimming is accomplished by applying a pulse width modulated signal (PWM) to change the average output current.

 

FEATURES 1.8 to 5.5V input range Very small packages (SOT or DFN) Wide temperature range -40° to 85°C RoHS-compatible

APPLICATIONS White LED backlighting White LED current source Color display backlighting

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
AME5134AEVAADJZ-3		30V Boost Convert for 2~6W LEDs
AME5136AEVBADJZ-3		Dual Boost DC-DC Converter
AME5142AEEVADJY		White LED Boost Converter in a Tiny Package
AME5142AEEYADJY		White LED Boost Converter in a Tiny Package

refers to New Product Introduction