YB1508
Step-up DC-DC Converter , White LED Driver
Pin Description
Figure 2：YB1508 SOT23-5
Pin Designator
Table 1 :
Pin
Name
Description
Switching Pin. This is the collector of the internal NPN power switch. Connect to
inductor and diode. Minimize the metal trace area connected to this pin to reduce
EMI.
1
SW
Ground Pin. Connect directly to local ground plane.
2
3
GND
FB
Feedback Pin. Reference voltage is 200mV. Connect LEDs and a resistor at this
pin. LED current is determined by the resistance and CTRL voltage.
Shutdown Pin and Dimming Control pin.
A. VCTRL > 1.8V generates full-scale LED current
B. VCTRL < 0.4V chip is off
4
5
CTRL
VIN
C. Switching from 0.4V to 2.0V, PWM duty cycle controls the LED current
Input Supply Pin. Bypass this pin with a capacitor as close to the device as
possible.
Ordering Information
Table 2:
Order Number
Package Type
Supplied as
Package Marking
Y58
High Ovp YB1508
Low Ovp YB1508P
SOT23-5
SOT23-5
3000 units Tape & Reel
3000 units Tape & Reel
Y58P
YB1508 MRev1.4
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