描述 Description

The R1215 Series are low supply current CMOS PWM step-up DC/DC controllers. R1215 does not include an internal output transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency step-up DC/DC converter can be easily configured. The oscillator maximum duty cycle and soft start time as well as phase compensation can be set with external resistor and capacitor. (The oscillator maximum duty cycle does not include internal limit.)

The oscillator frequency can be selected from 700kHz or 1.4MHz. The input voltage of R1215 is lower than the R1212. The voltage range is 1.8V (2.0V) to 5.5V. The latch type protection circuit embedded into the device latches the external driver in the \"OFF\" state when the oscillator maximum duty cycle continues for a predetermined period of time setting by an external capacitor. R1215 also includes an under-voltage lockout circuit (UVLO).

特性 Features

? Input Voltage Range (Maximum Rating)：2.0 V to 5.5 V (6.5 V) (R1215D002A/B),1.8 V to 5.5 V (6.5 V) (R1215D002E/F)；
? Supply Current： Typ. 600 μA (700 kHz),Typ. 900 μA (1.4 MHz)；
? Oscillator Frequency：Typ. 700 kHz, 1.4 MHz；
? Built-in Latch-type Protection Function：Output Delay Time can be set with an external capacitor；
? Maximum Duty Cycle：Adjustable with external capacitors；
? Soft-start Time：；
? Feedback Voltage：1.0 V；
? Feedback Voltage Accuracy：±1.5%；
? Temperature-Drift Coefficient of Feedback Voltage：Typ. ±150ppm/°C；
? UVLO Detector Threshold：Typ. 1.6 V/ 1.79 V by mask option；
? Package：SON-8 (t=MAX. 0.9mm)；

應(yīng)用 Application

? Constant Voltage Power Source for portable equipment
? Constant Voltage Power Source for LCD and CCD