RH5RI301B

The RH5RI301B is designed as VFM (chopper) step-up DC/DC converter IC with ultra low supply current by CMOS process. It consists of an oscillator, a VFM control circuit, a driver transistor, a reference voltage unit, an error amplifier, resistors for voltage detection and an Lx switch protection circuit.

It has eight features. (1)Small number of external components (only an inductor, a diode and a capacitor). (2)Ultra low input current typ 4uA. (3)High output voltage accuracy +/-2.5%. (4)Low ripple and low noise. (5)Low start-up voltage max 0.9V. (6)High efficiency typ 80%. (7)Low temperature-drift coefficient of output voltage typ +/-50ppm/°C. (8)Small package SOT-89. Those are all the main features.

Some absolute maximum ratings have been concluded into several points as follow. (1)Its output pin voltage would be +12V. (2)Its Lx pin voltage would be +12V. (3)Its EXT pin voltage would be from -0.3V to Vout+0.3V. (4)Its CE pin voltage would be from -0.3V to Vout+0.3V. (5)Its Lx pin output current would be 250mA. (6)Its EXT pin current would be +/-50mA. (7)Its power dissipation would be 500mW. (8)Its operating temperature range would be from -30°C to +80°C. (9)Its storage temperature range would be from -55°C to +125°C. (10)Its lead temperature (soldering) would be 260°C, 10s. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device.

Also some electrical characteristics are concluded as follow. (1)Its output voltage would be min 2.925V and typ 3.000V and max 3.075V. (2)Its input voltage would be max 8V. (3)Its start-up voltage would be typ 0.8V and max 0.9V. (4)Its hold-on voltage would be min 0.7V. (5)Its input current 1 would be typ 4uA and max 8uA. (6)Its input current 2 would be typ 2uA and max 5uA. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!