The RP501K series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP501K can be selected from two control types by input signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP501K includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2μH) can be used by the switching of 2.25MHz. The frequency accuracy improved to ±10%.
The RP501K Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters featuring a synchronous rectifier. Users can select between fixed PWM control and PWM/VFM auto switching control via the MODE pin, allowing automatic switching to high-efficiency VFM mode at low output currents.
Key features include a soft start circuit, an under-voltage lockout (UVLO) circuit, and a latch protection circuit. The device operates with a maximum oscillator frequency of 2.25MHz and supports input voltages from 2.5V to 5.5V.
| Supply Current (Iop1) | Typ. 450pA |
|---|---|
| Supply Current (Iop2) | Typ. 140uA |
| Output Current (Iout) | Max. 5A |
| Input Voltage Range | 2.5V to 5.5V |
| Output Voltage Range | 1.0V to 3.3V |
| Oscillator Frequency | 2.25MHz |
The device can provide a maximum output current of 5A when the input voltage is 5.5V and the CE pin is low.
The RP501K Series accepts an input voltage ranging from 2.5V to 5.5V.
The internal oscillator operates at a frequency of 2.25MHz.