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发布者:微桥 发布时间:2010/1/19 阅读:12742次    关键字: EMD2053
EMD2053-PWM Step-Up DC/DC Converter停产


 
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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

 
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General Description
    The EMD2053 designed with high efficiency step up DC/DC converter for driving white LEDs. The device can drive up 11 white LEDs from a single Li-Ion battery or a DC power 2.5V to 5.5V. The EMD2053 uses current mode and pulse-width modulated (PWM) operation. It switches at 1.2MHz and allows using small inductor and both of input/output capacitors. An internal compensation can reduce external component.
    The EMD2053 include under-voltage lockout, current limit, over voltage and thermal shutdown protection.
    The EMD2053 is available in SOT-26 package.

Features
􀂄 WLEDs supports (20mA for each channel):
􀂄 Up to 11S2P at VIN=3.7V
􀂄 Up to 11S4P at VIN=5.0V
(Note: S􀃆 Series; P􀃆 Parallel)
􀂄 Low Quiescent Current: 55 μA
􀂄 Over Voltage Protection: 37V
􀂄 Inherently Matched LED Current
􀂄 Shutdown Current < 1μA
􀂄 Reference Voltage 0.245V
􀂄 Efficiency : 85% (Typ) at VIN=5.0V
􀂄 PWM Dimming Control
􀂄 Internal Soft Start and Compensation
􀂄 1.4A Internal power MOSFET Switch
􀂄 Low Profile SOT-26 Package

Applications
􀂄 Mobile Phone
􀂄 Digital Still Cameras
􀂄 Portable applications
􀂄 MP3 Players
􀂄 GPS Receivers

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