EMD2055-PWM Step-Up DC/DC Converter for Panel Backlight DataSheet
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).
Digital Still Cameras
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