STEP-UP DC/DC CONTOLLER
The R1215D is a CMOS-based PWM step-up DC/DC controller with low supply current. The R1215D consists of an oscillator, a PWM comparator circuit, a reference voltage unit, an error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or an inductor, a diode, a power MOSFET, resisters, and capacitors.
The maximum duty cycle and the soft start time are easily adjustable with external resistors and capacitors. As for the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period, the R1215D latches the external driver with its off state, or the latch-type protection circuit works.
The delay time for latch the state can be set with an external capacitor.
To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector threshold level).
|Input Voltage Range||1.8 V to 5.5 V|
|Two Options of Basic Oscillator Frequency||Typ. 700kHz, 1.4MHz|
|Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)|
|Maximum Duty Cycle/Soft-start time||Adjustable with external capacitors|
|High Reference Voltage Accuracy||±1.5%|
|UVLO Threshold level||Typ. 1.6 V/ 1.79 V by mask option|
|Small Temperature Coefficient of Reference Voltage||Typ. ±150ppm/°C|
|Package||SON-8 (t=Max. 0.9mm)|
- ・Constant Voltage Power Source for portable equipment.
- ・Constant Voltage Power Source for LCD and CCD.
|Data Sheet||Flyer||Package Info.||Mark Info.||Quality Assurance Data|
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