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YB1303 Datenblatt(PDF) 6 Page - YOBON TECHNOLOGIES,INC.

Teilenummer YB1303
Bauteilbeschribung  Low Dropout LED Driver
PDF  8 Pages
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Hersteller  YOBON [YOBON TECHNOLOGIES,INC.]
Direct Link  http://www.yobon.com.tw
Logo YOBON - YOBON TECHNOLOGIES,INC.

YB1303 Datenblatt(HTML) 6 Page - YOBON TECHNOLOGIES,INC.

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YB1303
Low Dropout LED Driver
YB1303 Rev.1.0
www.yobon.com.tw
6
Example 1:
Drive low VF white or blue LEDs directly
from single cell Li-Ion battery
When using white or blue low VF LEDs,
and utilizing the driver’s low voltage drop,
only 3.4V in VIN is needed for the full 20mA
LED current. At 3.2V, there is still 5mA
typical current available for the LEDs. The
single cell Li-Ion battery is utilized in many
applications like cell-phones and digital still
cameras. In most cases, the Li-Ion battery
voltage level only goes down to 3V, and not
down to the full discharged level (2.7V)
before requesting the charger.
-VDROP < 0.3V
-VF (@20mA) < 3.1V (Low VF)
-VIN (@20mA) = -VDROP+VF=3.4V
-VIN (@5mA typical) ~3.1V
Where VIN = Single cell Li-Ion Voltage
Key advantages:
No boost circuit needed for the LCD or
keyboard backlight.
Drivers directly connected to a Li-Ion
battery.
No EMI, no switching noise, no boost
efficiency lost, no capacitor and no
inductor.
Example 2:
Drive high VF white or blue LEDs from
exiting bus from 4.0V to 6V
High VF white or blue LEDs have forward
voltage drop in the range of 3.2V to 4.0V.
To drive these LEDs with the maximum
current of 20mA for maximum brightness,
usually requires a boost circuit for a single
cell Li-Ion voltage range. In some cases,
there is already a voltage bus in the system,
which can be utilized. Due to the ultra-low
voltage drop of the YB1303 to drive high VF
white or blue LEDs, the VIN needs to be
only 300mV higher than the highest VF in
the circuit.
-VDROP < 0.3V
-VF (@20mA) < 3.3V to 4.0V (High VF)
-VIN (@20mA) = -VDROP+VF=3.6V to 4.3V
-VIN (@5mA typical) ~3.3V
Where VIN = Existing bus = 3.3V to 4.3V
Key advantages:
No boost circuit needed for the LCD or
keyboard backlight.
Driver utilizes the existing bus.
Ultra-low voltage drop provides the full
20mA LED current at the lowest possible
voltage level.



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