Step-up DC/DC Converter For White LED Backlight

The R1218K R1218N Series are PWM control type Step-up DC/DC converter ICs with low supply current. The R1218x is fully dedicated to drive White LED with constant current. Each of these ICs consists of an NMOS FET an Oscillator a PWM Comparator a Voltage Reference unit, an error Amplifier an under voltage lockout circuit (UVLO), an over-voltage protection circuit (OVP), and so on. The R1218x CAN drive white LEDs with high efficiency with low supply current. A Diode is built-in the R1218xxx1A, therefore it is possible to drive up to 4LEDs without an external Diode The R1218xxx2A, an external Diode is necessary, however, up to 6 serial LEDs CAN be driven with the R1218xxx2A. Constant current CAN be set with an external resistance value. Dimming control is possible by PWM signal for CE pin. Feedback voltage is 0.2V, therefore power loss by current setting resistance is small and efficiency is good. Maximum duty cycle is internally fixed, Typ. 91%. LEDs CAN be driven from low voltage. Protection circuits are the current limit of Lx peak current, the over voltage limit of output, and the under voltage lockout function. Packages are standard SOT-23-6 and very tiny DFN(PLP)1820-6.
By RICOH Co.,Ltd.
R1218K 's PackagesR1218K 's pdf datasheet
R1218N021A
R1218N031A
R1218N041A
R1218N022A
R1218N032A
R1218N042A
R1218N052A
R1218N062A
R1218K021A
R1218K031A
R1218K041A
R1218K022A
R1218K032A
R1218K042A
R1218K052A
R1218K062A
R1218N




R1218K Pinout, Pinouts
R1218K pinout,Pin out
This is one package pinout of R1218K,If you need more pinouts please download R1218K's pdf datasheet.

R1218K Application circuits
R1218K circuits
This is one application circuit of R1218K,If you need more circuits,please download R1218K's pdf datasheet.


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