The Ricoh RP600x series consists of high efficiency, current mode step-up DC-DC converter ICs featuring an integrated voltage regulator and a voltage detector. These devices are designed to start up from low voltages (typical 0.8V) provided by alkaline or NiMH batteries, or single Li+ batteries.
The IC includes various protection circuits such as current limit, thermal shutdown, and soft-start functions to prevent inrush currents. It offers different versions (A, B, C, D) with varying configurations for the DC/DC converter output voltage (fixed or adjustable), LDO power supply source, and voltage detector hysteresis settings.
| Input Voltage Range (DC/DC) | 0.8V~5.5V |
|---|---|
| High Efficiency | 85% |
| Output Current (A/D version) | + 400mA/4.2V |
| Switch Transistor Resistance | 0.16Ω |
| Output Voltage Tolerance (DC/DC) | +/- 2.0% |
| Operating Frequency | Typ. 1.2MHz |
| Output Voltage Range (DC/DC) | Fixed: 2.3V to 5.5V; Adjustable: 2.3V~5.5V |
| Peak Current Control Function | Typ. 1.4A |
| LDO Output Voltage Range (B version) | from 2.0V to 5.5V |
| LDO Turn-on Speed | Typ. 100us |
| Package Type | DFN(PLP)2527-10 |
The converter starts up from low voltage operation, typically 0.8V.
The A, B, and D versions include a thermal shutdown circuit; the C version does not.
The recommendation is 4.7uH.
Typical applications include portable equipment such as DSCs, cellular phones, electrical dictionaries, and smoke detectors.