DESCRIPTION
The TK11851L-G is a pulse skipping step-up DC-DC converter IC designed for White LED driver applications, suitable for 2 to 4 LEDs, with the following built in : a high current switching transistor (400mA peak),an inductor current limit detector, a low voltage reference (Vref=0.515V),a high speed oscillator, an error comparator, a zener diode for open circuit protection (OVP) and an ON/OFF control(En pin). The IC works with a wide operating supply range (2.3~10V). The white LEDs are connected in series and driven at a constant current resulting in uniform brightness.

FEATURES
● Wide Operating Voltage: 2.3 to 10.0V
● Built-in Switching Transistor
● Active High On/Off Control: En pin
● Available Intensity Control Using En Pin with PWM Signal (Pulse Width Modulation)
● Operates with Toko D31FB Miniature Coil (Current Limited by Input Current Sensor)
● Few External Components
● OVP (Open-circuit Voltage Protection)
● Small Package: SOT23L-8

APPLICATIONS
● The White LED Driving Systems: 2 to 4
        For Back-lighting and Front-lighting, Flashlights etc.
            Mobile Communication Systems:
            Cellular Phone, PHS, DSC, PDA,
            Computer Peripheral Equipment
            Battery & Dry Cell Battery Systems
            Portable Equipment
● Step-up DC-DC Converter (Voltage Supply)
        Camera, Radio, Communications Equipment etc