RP400xxx1A Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23 or 6pin DFN(PLP). This converter starts up of low voltage (Typ.0.8V) operation from one to two alkaline or a nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) battery. This IC consists of a reference voltage unit with soft start, a chip enable circuit, an error amplifier, phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control circuit, internal switches and a protection circuit. As a protection circuit, RP400xxx1A has a current limit circuit which limits the peak current of the inductor at each clock cycle. A low ripple high efficiency step up DC/DC converter can be composed of RP400xxx1A Series with only an inductor, a diode and capacitors. This converter is based on a fixed frequency current mode PWM control which goes to power save mode (VFM mode) at light load automatically. RP400xxx1A Series has built-in Anti-ringing switch to prevent switching node from ringing, when the converter enters the discontinuous current mode. The output voltage of RP400K001A can be set within 1.8~5.0V (recommended range of output voltage) by external divider resistors.
The RP400xxx1A Series consists of high efficiency, step-up DC/DC converter ICs available in compact Spin SOT23 or 6pin DFN(PLP) packages. These devices are capable of starting up from very low voltages (Typ. 0.8V), making them suitable for operation from one to two alkaline or NiMH batteries, as well as single-cell Lithium-ion batteries.
The IC integrates a reference voltage unit with soft start, chip enable circuit, error amplifier, phase compensation circuits, and various protection features including peak current limit. It operates based on fixed frequency current mode PWM control which automatically switches to power save VFM mode at light loads. The output voltage can be set within 1.8V to 5.0V using external divider resistors.
| Start-up Voltage | Typ. 0.8V |
|---|---|
| Input Voltage Range | ~0.8V ~5.5V |
| Efficiency | Typ. 85% |
| Output Current | Typ. 200mA @ 3.3V |
| Internal Switch On-Resistance | Typ. 0.4 Ohm |
| PWM Oscillator Frequency | 700kHz |
| Output Voltage Range | 1.8V to 5.0V |
| Ambient Temperature Range | -40 to +85 °C |
The guaranteed low start-up voltage is 0.8V.
It supports one to two alkaline or NiMH batteries, and one-cell Lithium-ion (Li+) batteries.
The ICs are packaged in compact Spin SOT23 or 6pin DFN(PLP).