RP500x Series

600mA* Step-down DC/DC Converter with Synchronous Rectifier

Data Sheet / Flyer
Data Sheet * Flyer

The RP500x Series are CMOS-based 600mA* 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. 0.1V 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 WLCSP-6-P2, DFN1616-6, DFN(PLP)1820-6, SOT-23-6W, high density mounting on boards is possible.

*)This is an approximate value, because output current depends on conditions and external parts.

Supply Current Typ. 400μA (at PWM mode)
Typ. 100μA (at VFM mode)
Standby Current Max. 5μA
Input Voltage Range 2.55V to 5.50V
Output Voltage Range 1.1V to 3.3V (0.1V steps)
(For other voltages, please refer to MARK INFORMATIONS.)
Output Voltage Accuracy ±1.5% (VOUT>=1.6V), ±24mV (VOUT<1.6V)
Temperature-Drift Coefficient of Output Voltage Typ. ±100ppm/°C
Oscillator Frequency Typ. 1.2MHz
Oscillator Maximum Duty Cycle Min. 100%
Built-in Driver ON Resistance Typ. Pch. 0.3Ω, Nch. 0.38Ω (VIN=3.6V)
UVLO Detector Threshold Typ. 2.2V
Soft Start Time Typ. 120μs
Lx Current Limit Typ. 900mA
Latch type Protection Circuit Typ. 1.5ms
Two choices of Switching Mode Automatic PWM/VFM mode change / PWM fixed
Packages WLCSP-6-P2, DFN1616-6, DFN(PLP)1820-6, SOT-23-6W
  • Power source for battery-powered equipment.
  • Power source for hand-held communication equipment, cameras, VCRs, camcorders.
  • Power source for HDD, portable equipment.

Data Sheet Flyer Design Guide
RP500x Series RP500x Series RP500xxxxA Series
Package Info. Mark Info. Quality Assurance Data
DFN(PLP)1820-6 RP500K Reliability
DFN1616-6 RP500L Reliability
SOT-23-6W RP500N Reliability
WLCSP-6-P2 RP500Z Reliability

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