1A Step-down DC/DC Converters with synchronous rectifier
The RP501K Series are CMOS-based step-down DC/DC Converters with synchronous rectifier.
Each of these ICs consists of an oscillator, a switching control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, UVLO circuit, switching transistors. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors. In terms of the output voltage, since the feedback resistances are built-in, the voltage is fixed internally. 50mV (custom-made) step output can be set by laser-trim and ±1.5% or ±24mV tolerance depending on the output voltage is guaranteed.
Mode alternative circuit works automatically for improving the efficiency. Considering fixed noise frequency, PWM fixed control type is also available. As protection circuits, the current limit circuit which limits peak current of LX at each clock cycle, and the latch type protection circuit which works if the term of the over-current condition keeps on a certain time exist. The latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of the protection, after disabling this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO.
Since the package is DFN(PLP)2527-10, high density mounting on boards is possible.
|Input Voltage Range||2.5V to 5.5V|
|Output Voltage||1.0V to 3.3V|
|High Accuracy Output Voltage||±1.5% (Vout>=1.6V)
|Oscillator Frequency||Typ. 2.25MHz|
|Built-in Soft start Function||Max. 0.2ms|
|Built-in Peak current limit||Typ. 1.5A|
|Built-in UVLO Function||Typ. 2.2V|
|Switching Mode can be controlled by Mode pin||Automatic PWM/VFM mode change / PWM fixed|
- •Power source for portable equipment such as cellular, PDA, DSC, Notebook PC
- •Power source for HDD, WLAN, Car accessories
- •Power source for Li-ion battery-used equipment
|Data Sheet||Flyer||Design Guide|
|Package Info.||Mark Info.||Quality Assurance Data|
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