Chip drives three LEDs for backlighting

New from Seiko Instruments, the S-8813 Series three-channel white LED driver is a CMOS charge pump IC with a built-in constant-current circuit.

New from Seiko Instruments, the S-8813 Series three-channel white LED driver is a CMOS charge pump IC with a built-in constant-current circuit.

The ultra-small SON10 package and constant-current output make this series ideal as a white LED backlight power supply in cell phones and PDAs.

And as small ceramic capacitors can be used as external capacitors, the S-8813 helps in reducing the size of the overall circuit.

The S-8813 can power up to three LEDs and is available in two output configurations.

The S-881300BPE-TB allows the user to vary the output current linearly between 5 and 18mA by changing the voltage supplied to the current set pin.

The S-881300CPE-TB allows the user to set the output current between 5 and 18mA by connecting a resistor to the current set pin.

Other features include wide ranging input voltage (2.7 to 4.5 V), 600kHz (typical) oscillation frequency, three channels of constant current output at +/-5% accuracy and a built-in soft-start circuit rated at 1.5ms.

The S-8813 Series is available now and is priced at $1.20 each, in quantities of 10,000.

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