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RP505 Series
1A PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP505 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP505 can be selected from two control types by input signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The xx1A/B version with an internally fixed output voltage type and the 001C version with an externally adjustable output voltage type are available.

RP505 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor and capacitors (and resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) and output capacitor (10µF) can be used by the switching of 2.25MHz. A 2mm square compact DFN(PLP)2020-8 package is available.


Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (6.5V)
Supply Current Typ. 40 µA (VFM mode with no-load)
Standby Current Typ. 0 µA
Output Voltage Range Ver.A,B 0.6 V to 3.3 V (Adjustable in 0.1 V steps.
Note: As for 0.8 V or less, input voltage range is limited.)
Ver.C 0.8 V to 3.3 V
Output Voltage Accuracy Ver.A,B ±1.5% (VOUT≥1.2V), ±18mV (VOUT<1.2V)
Feedback Voltage Accuracy Ver.C ±9 mV (VFB=0.6V)
Temperature-Drift Coefficient of Output Voltage/ Feedback ±100 ppm/°C
Oscillator Frequency Typ. 2.25 MHz
Oscillator Maximum Duty Cycle Min. 100%
Built-in Driver ON Resistance Typ. Pch. 0.23 Ω, Nch. 0.20 Ω (VIN=3.6V)
UVLO Detector Threshold Typ. 2.0 V
Soft-start Time Typ. 0.15 ms
Lx Current Limit Circuit Typ. 1.7 A
Latch Type Protection Circuit Typ. 1.5 ms
Package DFN(PLP)2020−8





RP505K331x Efficiency vs. Output Current



DFN(PLP)2020-82.0 mm × 2.0 mm
2 CE
3 AVIN**
4 PVIN**
5 Lx
6 PGND**
7 AGND**

*) The tab is substrate level (GND).
**) No.3 pin and No.4 pin, No.6 pin and No.7 pin must be wired together when it is mounted on board.

RP505 Series for Consumer


  • Power source for portable equipment such as cellular, PDA, DSC, Notebook PC
  • Power source for HDD, WLAN
  • Power source for Li-ion battery-used equipment


RP505 series operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


In the RP505 Series, output voltage, and auto discharge function for the IC are selectable at the user’s request.

Product Name   Package Quantity per Reel
RP505Kxx1$−TR ConsumterPLP DFN(PLP)2020−8 5,000
  • xx … The output voltage can be designated in the range from 0.6V(06) to 3.3V(33) in 0.1V steps. (0.05V step is also available as a custom code.)
    The output voltage adjustable type: xx=00
  • $ … Designation of Mask Option
    A: Fixed output voltage type, without auto-discharge function at off state
    B: Fixed output voltage type, with auto-discharge function at off state
    C: Adjustable output voltage type, without auto-discharge function at off state

* Auto-discharge function quickly lowers the output voltage to 0V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.



Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2020-8 RP505K RP505K

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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