RP500X Datasheet, PDF (1/16 Pages) RICOH electronics devices division – The RP500X Series are CMOS-based step-down DC/DC Converters with synchronous rectifier.

RP500x SERIES
NO.EA-155-070919
OUTLINE
The RP500X 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, and so on. 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 packages are PLP1820-6, SOT23-6, WLCSP-6 (0.16φ), high density mounting on boards is possible.
FEATURES
Output Current....................................... Min. 400mA
Input Voltage Range............................. 2.55V to 5.50V
Output Voltage...................................... 1.1V to 3.3V
High Accuracy Output Voltage ............. ±1.5% (Vout≥1.6V)
±24mV (Vout<1.6V)
Oscillator Frequency.............................. Typ. 1.2MHz/3.3MHz(We changed the product name of 3.3MHz
device.)
Built-in Soft start Function..................... Typ.0.1ms
Built-in Lx Peak Current Limit................ Typ. 900mA
Built-in Latch type Protection................. Typ.1.5ms
Built-in UVLO Function.......................... Typ. 2.2V
Two choices of Switching Mode............. Automatic PWM/PFM mode change / PWM fixed
Packages................................................ PLP1820-6, SOT23-6W, WLCSP-6 (0.16φ)
APPLICATIONS
Power source for portable equipment such as cellular, PDA, DSC, Notebook PC
Power source for HDD
Power source for Li-ion battery-used equipment
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