The R5220x Series 400mA ∗PWM Step-down DC/DC Converter with Switch Function is a CMOS-based PWM step-down DC/DC converter with synchronous rectifier. R5220x also has the function of switching to the LDO regulator. By switching with the MODE pin, the device can be used as an LDO regulator (Output Current 50mA) in the smaller output current range, while it can be used as a DC/DC converter (Output Current 400mA∗) under high load conditions. (The polarity of the MODE pin is selectable.) The DC/DC converter contains an under-voltage lockout circuit (UVLO), a soft start circuit, and a latch type protection circuit. By simply using an inductor and a capacitor, a high-efficiency DC/DC converter can be easily configured.
The R5220x Series are CMOS-based PWM step-down DC/DC converters featuring a synchronous rectifier. The device includes a function to switch to an LDO regulator via the MODE pin, allowing operation as an LDO (50mA output) for low current ranges or as a DC/DC converter (400mA output) under high load conditions. The polarity of the MODE pin is selectable.
| Output Current (DC/DC mode) | Typ. 400mA |
|---|---|
| Output Current (LDO mode) | 50mA |
| Input Voltage Range | 2.8V to 5.5V |
| Oscillator Frequency | 2MHz |
| Soft Start Time | Typ. 0.2ms |
| Coil-current Limit | Typ. 800mA |
| Packages | DFN(PLP)2514-6, SON-6 |
Yes, by switching with the MODE pin, the device can be used as an LDO regulator with an output current of 50mA.
The device can be used as a DC/DC converter with an output current of 400mA under high load conditions.
Yes, the polarity of the MODE pin is selectable to choose between DC/DC and VR modes.