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R1215D Series

STEP-UP DC/DC CONTOLLER

Data Sheet / Flyer

The R1215D Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.

Each of the R1215D Series 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.

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 Series latch 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	1.8V to 5.5V
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. 1.6V/1.79V by mask option
Small Temperature Coefficient of Reference Voltage	Typ. ±150ppm/°C
Package	SON-8 (t=Max. 0.9mm)