YB1314 Datasheet, PDF (1/1 Pages) YOBON TECHNOLOGIES,INC. – 120mA 1x/1.5x/2x Charge Pump for White LED

Preliminary YB1314
120mA 1x/1.5x/2x Charge Pump for White LED
Description
The YB1314 charge pump drive up to 4
white LEDs with regulated constant current.
The devices can be used to produce
current levels up to 30mA for each output
from a 2.7V to 5.5V input. The 1MHz
fix-frequency switching allows for tiny
external components, and the regulation
scheme is optimized to ensure low EMI and
low input ripple.
Serial data input control is used to enable,
disable and set the LED drive current for a
32 level logarithmic scale LED brightness
control. Internal softstart circuitry effectively
reduces the in-rush current. YB1314 also
provides short circuit protection,
over-temperature protect- tion and
over-voltage protection. In shutdown mode,
the shutdown current is less than 1µA.
YB1314 is available in a QFN-16 3*3
package.
Features
„ Input Range : 2.7V to 5.5V
„ Drives up to 4 LEDs at 30mA Each
„ 1MHz Internal Oscillator
„ Thermal Protection Shutdown
„ Output Short-circuit Current Limit and
Overvoltage Protection
„ Undervoltage Lockout With
Hysteresis
„ Automatic Soft-Start Reduces
In-Rush Current
„ Three Charge Pump Modej1x/1.5x/2x
„ 3mm x 3mm QFN package
Applications
„ White LED Backlighting
„ Handheld PCs and PDAs
„ Mobile Phone
Typical Application Circuit
+
VBATTERY
-
VIN
C1+
VOUT
C1-
CIN
1µF
C_OUT
2.2µF
EN/SET
C2+
YB1314 ^C2-
D1
D2
D3
EN/SET
D4
GND
C1
1µF
C2
1µF
D4 D3 D2 D1
Figure 1. Typical application circuit
YB1314 MRev.0.1
www.yobon.com.tw
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