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发布者:微桥 发布时间:2011/7/7 阅读:5366次    关键字: EMD2050 EMD2053 EMD2093
EMD2050-PWM Step-Up Converter LED Driver停产


 
General Description
    The EMD2050 designed with high efficiency step up DC/DC converter for driving white LEDs. The device can drive up 3 white LEDs from a single Li-Ion battery or a DC power 2.5V to 5.5V. The EMD2050 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 EMD2050 include under-voltage lockout, current limit, over voltage and thermal shutdown protection. The EMD2050 is available in SOT-26 package.
 
Applications
􀂄 Mobile Phone
􀂄 Digital Still Cameras
􀂄 Portable applications
􀂄 MP3 Players
􀂄 GPS Receivers
Features
􀂄 WLEDs supports (20mA for each channel):
􀂄 Up to 3S13P at VIN=3.7V
􀂄 Up to 3S18P at VIN=5.0V
(Note: S􀃆 Series; P􀃆 Parallel)
􀂄 Low Quiescent Current: 55 μA
􀂄 Over Voltage Protection: 15V
􀂄 Inherently Matched LED Current
􀂄 Shutdown Current < 1μA
􀂄 Reference Voltage 0.235V
􀂄 Efficiency : 85% (Typ) at VIN=5.0V
􀂄 PWM Dimming Control
􀂄 Internal Soft Start and Compensation
􀂄 Low Profile SOT-26 Package
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