YB1313 Datasheet, PDF (5/9 Pages) YOBON TECHNOLOGIES,INC. – 1x/1.5x/2x Charge Pump for White LED Application

Functional Block
YB1313
1x/1.5x/2x Charge Pump for White LED Application
C1+ 10
C1- 11
C2+ 9
C2- 12
VIN 13
PGND VOUT
7
8
1x/1.5x/2x
Charge Pump
Reference
Current Sinks
+
Selmin
-
2 D5
3 D4
4 D3
5 D2
6 D1
EN1 15
EN2 16
Control
14
GND
Figure 3. Block Diagram
1 ISET
Functional Description
The YB1313 uses a multi-mode fractional
charge pump to generate a supply voltage and a
precise sink circuitry to ensure a constant
driving current for each LED. The charge pump
operates in either 1x mode, 1.5x mode or 2x
mode, depending on the input voltage and
output current loading. The overall power
consumption is best optimized by automatically
switching among the 3 different operation
mode.
The charge pump is possible to generate a total
output current of more than 125 mA, more than
25 mA for each LED. But it is recommended to
operate the device under total 125 mA.
Connecting a R_SET resistor of 10K ohm from
pin I_SET to ground generates around 20 mA
LED output current and a R_SET of 7.5K
generates around 26 mA.
YB1313 MRev.1.1
www.yobon.com.tw
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