Skip to main content Skip to first level navigation
Skip to main content First level navigation Menu
Contact Us About Us
Facebook (Open link in new window) YouTube (Open link in new window) LinkedIn (Open link in new window)
Main content
Main content

RP400 Series

Current Mode PWM/VFM Step-up DC/DC Converter

  • Consumer
  • RoHS

The RP400 Series are CMOS-based automatic switch PWM- or VFM-controlled step-up DC/DC converters. RP400 includes a soft start circuit. By simply using an inductor, a capacitor, a diode, and (resistors) as external components, a high-efficiency step-up DC/DC converter can be easily configured. Due to current mode PWM control, the RP400 provides a fast response and high efficiency. Ceramic output capacitors can be used.

The output voltage can be selected from the internally fixed or the externally adjustment. The RP400 has an anti-ringing switch that prevents inductor current from ringing in PWM discontinuous mode. RP400 switches automatically to VFM control in low output current, keeping high efficiency. In addition to SOT-23-5 package, a 1.8mm × 2.0mm square DFN(PLP)1820-6 package is also available.

Specs & Datasheets

Input Voltage Range 0.7 V to 5.5 V (6.0 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 300 µA (VSET = 3.0 V, switching)
Typ. 160 µA (non-switching)
Standby Current Typ. 0.15 µA (CE="L") (Ver. A/C)
Start-up Voltage Max. 0.9 V (Ver.C: Max. 1.5 V)
Output Voltage Range 1.8 V to 5.0 V
(Internally Fixed Ver.: xx1, Externally Adjustable Ver.: 001)
Output Voltage Accuracy ±2% (Ta = 25°C)
Oscillator Frequency Typ. 700 kHz
Maximum Duty Cycle Typ. 88%
Package DFN(PLP)1820-6, SOT-23-5

Download Datasheet

Protections / Functions

Functional Description

TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust

Technical Documents

Design Support

RP400x001A Typical Application (Externally adjustable output voltage type)

RP400x001A Typical Application (Externally adjustable output voltage type)

RP400xxx1A Typical Application (Internally fixed output Voltage type)

RP400xxx1A Typical Application (Internally fixed output Voltage type)

RP400x001A Efficiency vs. Output Current

RP400x001A Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
DFN(PLP)1820-6 RP400Kxx1A RP400K
  • gradeConsumerC
DFN(PLP)1820-6 RP400Kxx1B RP400K
  • gradeConsumerC
DFN(PLP)1820-6 RP400Kxx1C RP400K
  • gradeConsumerC
SOT-23-5 RP400Nxx1A RP400N-FE
  • gradeConsumerC
SOT-23-5 RP400Nxx1B RP400N-FE
  • gradeConsumerC
SOT-23-5 RP400Nxx1C RP400N-FE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Boost
min (V)
max (V)
min (V)
max (V)