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YB1315 Datasheet(PDF) 1 Page - YOBON TECHNOLOGIES,INC.

Part No. YB1315
Description  High Efficiency Charge Pump White LED Driver
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Maker  YOBON [YOBON TECHNOLOGIES,INC.]
Homepage  http://www.yobon.com.tw
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YB1315 Datasheet(HTML) 1 Page - YOBON TECHNOLOGIES,INC.

 
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Preliminary YB1315
High Efficiency Charge Pump White LED Driver
YB1315 Rev.0.1
www.yobon.com.tw
1
VIN
C1+
C1-
C2+
C2-
EN1
EN2
GND
VOUT
D1
D2
D3
D4
D5
ISET
PGND
0. 47µF
0. 47µF
1µF
VIN = 2.7V
to 5.5V
YB1315
1uF
Description
The YB1315 charge pump is designed to
drive up to 5 white LEDs with regulated
constant current in backlight display
application. The device can provide up to
25mA per LED for a total 5 channels. The
output current can also be combined into
one single channel with 125mA output
current for flash-light applications. The
input voltage ranges from 2.7V to 5.5V and
is ideal for applications powered by a
single Li-Ion or 3 to 4 NiCd, NiMH or
Alkaline batteries.
YB1315 monitors the power-supply input
voltage and LED forward voltage and
current, and does an automatic selection to
a switching mode that is optimized for the
power conversion efficiency as well as
battery operating time. The 1MHz fixed
frequency switching allows for tiny external
components, and the regulation scheme is
optimized to ensure low EMI and low input
ripple.
Internal
soft-start
circuitry
effectively
reduces the in-rush current. YB1315 also
provides
short
circuit
protection,
over-temperature
protection
and
over-voltage protection. In shutdown mode,
the shutdown current is less than 1μA.
YB1315 is available in a TQFN-16 3x3
package.
Features
Voltage Input Range From 2.7V to 5.5V
Drives From 3 to 5 LEDs at Up to 25mA
Each
Fractional Conversion Modes for High
Conversion Efficiency, 1x and 1.5x
1MHz Internal Oscillator
Thermal Protection Shutdown
Output Short-circuit Current Limit and
Over-Voltage Protection
Under-Voltage Lockout with Hysteresis
Automatic Soft-Start Reduces In-Rush
Current
3mm x 3mm TQFN Package
Applications
White LED Backlighting
Handheld PCs and PDAs
Mobile Phone
DSC and DV flash light application
Typical Application Circuit
Figure 1: Typical Application Circuit


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