RP504x series is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous rectifier. RP504K/L can be switched from two control types by inputting signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. (RP504N Series can be selected from forced PWM control or PWM/VFM auto switching control.) RP504x 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) and output capacitor (4.7μH) can be used by the switching of 2.25MHz. In addition to SOT-23-5 and DFN1616-6B packages, a 1.2mm × 1.6mm DFN(PLP)1216-6B package is also available.
The RP504x Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters featuring a synchronous rectifier. These devices can be switched between forced PWM control and PWM/VFM auto-switching control by inputting a signal to the MODE pin, automatically switching to high-efficiency VFM mode at low output currents.
The series includes built-in protection features such as soft start, under-voltage lockout (UVLO), and latch protection. It is configured using an external inductor and capacitors to create a high-efficiency converter operating at a 2.25MHz oscillator frequency.
| Output Current | 600mA* |
|---|---|
| Supply Current (PWM Mode) | Typ. 400nA |
| Supply Current (VFM Mode) | Typ. 25nA |
| Input Voltage Range | 2.3V to 5.5V |
| Output Voltage Range | 0.8V to 3.3V |
| Oscillator Frequency | 2.25MHz |
| Output Voltage Accuracy | +1.5% |
The RP504K/L can be switched from forced PWM control to PWM/VFM auto-switching control by inputting a signal to the MODE pin.
The RP504x Series provides an approximate output current of 600mA.