The R1242S Series are CMOS-based 30V Input, 3A, Synchronous Rectified Step-down DC/DC Converters with built-in Highside Switch.
The Ricoh R1242S Series are CMOS-based synchronous rectified step-down DC/DC converters with a built-in high-side switch. These ICs are designed to supply a maximum 3A output current and operate with a current mode topology that does not require a sense resistor, achieving high speed and efficiency. The series supports an operating voltage range of 5V to 30V and includes various protection functions such as peak current limit, latch, fold back, thermal shutdown, and undervoltage lockout.
| Operating Voltage | 5V ~ 30V |
|---|---|
| Supply Current | Typ. 0.8mA |
| Output Current | 3A |
| Peak Current Limit | Typ. 4.5A |
| Adjustable Output Voltage | 0.8V ~ 15V |
| Feedback Voltage Accuracy | 1.5% |
| Soft Start Time | Typ. 0.5ms |
| Maximum Duty Cycle | Typ. 88% |
| Thermal Shutdown Temperature | Typ. 160°C |
| Operating Temperature Range | -40 ~ 85 °C |
The R1242S Series can supply a maximum 3A output current.
No, it operates with Current Mode Topology which does not require any sense resistor.
The series includes Peak Current Limit, Latch, Fold back, Thermal-Shutdown, and Undervoltage-Lockout (UVLO) functions.
The typical internal soft-start time is 0.5ms.