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EMD2055 - PWM Step-Up DC/DC Converter

General Description

The EMD2055 is a highly efficient, step-up DC/DC converter for driving white LEDs.

The device can drive up to 10 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.

Key Features

  • Up to 10 WLEDs supports.
  • Low Quiescent Current: 120 µA.
  • Over Voltage Protection: 36.5V.
  • Inherently Matched LED Current.
  • Shutdown Current < 1µA.
  • Reference Voltage 0.245V.
  • PWM Dimming Control (2kHz~200kHz).
  • Internal Soft Start and Compensation.
  • 1.4A Internal power MOSFET Switch.
  • Low Profile SOT-23-6 and TDFN-8L Packages Typical.

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Other Datasheets by ESMT (Elite Semiconductor Microelectronics Technology)

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Full PDF Text Transcription (Reference)

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ESMT EMD2055 PWM Step-Up DC/DC Converter for Panel Backlight (10 WLEDs Driver) General Description The EMD2055 is a highly efficient, step-up DC/DC converter for driving white LEDs. The device can drive up to 10 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 1.2MHz 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.