EMD2055-PWM Step-Up DC/DC Converter for Panel Backlight DataSheet

General Description
    The EMD2055 is a highly efficient, step-up DC/DC converter for driving white LEDs. The device can drive up to 11 serially connected white LEDs from a single Li-Ion battery, or to drive multiple serial and parallel combinations with a DC power supply from 2.5V to 5.5V. The EMD2055 uses current mode and pulse-width modulated (PWM) operation. Its high switching operation frequency of 1.0MHz allows the system to use small inductor, input and output capacitors. An internal compensation circuit can reduce the external component count.
    To safeguard the system, the EMD2055 includes various protection circuits such as under-voltage lockout, current limit, over voltage and thermal shutdown. EMD2055 are available in the tiny packages of SOT-23-6L and TDFN-8L (2x2mm).

Applications

Mobile Phone

Digital Still Cameras

Portable applications

MP3 Players

GPS Receivers

Features

Up to 11 WLEDs supports

Low Quiescent Current: 120 μA

Over Voltage Protection: 36.5V

Inherently Matched LED Current

Shutdown Current < 1μA

Reference Voltage 0.24V

PWM Dimming Control (100Hz~100kHz)

Internal Soft Start and Compensation

1.5A Internal power MOSFET Switch

Low Profile SOT-23-6 and TDFN-8L Packages