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

YB1313
1x/1.5x/2x Charge Pump for White LED Application
Description
The YB1313 charge pump is designed to drive
up to 5 white LEDs with regulated constant
current in back lit display application. The
device can provide up to 25 mA per LED for a
total of more than 125 mA. 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.
The 1MHz fix-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. YB1313 also provides short
circuit protection, over-temperature protection
and over-voltage protection. In shutdown mode,
the shutdown current is less than 1μA. YB1313
is available in a TQFN-16 3x3 package.
Features
„ Input Range : 2.7V to 5.5V
„ Drives up to 5 LEDs at 25mA Each
„ 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
„ Three Charge Pump Mode：1x/1.5x/2x
„ 3mm x 3mm TQFN package
Applications
„ White LED Backlighting
„ Handheld PCs and PDAs
„ Mobile Phone
Typical Application Circuit
VIN = 2.7V
To 5.5V
1 µF
0. 47 µF
0. 47 µF
VIN
VOUT
C1+
D1
C1-
D2
C2+
D3
YB 1313
C2-
D4
EN1
D5
EN2
GND
ISET
PGND
2.2uF
Figure 1. Typical application circuit
YB1313 MRev.1.1
www.yobon.com.tw
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