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 |
