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RP901 Series

PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier Equipped with VR and VD

  • Consumer
  • RoHS

The RP901 Series are CMOS-based PWM/VFM step-down DC/DC converters equipped with voltage regulator and voltage detector. The DC/DC converter can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current.

RP901 was developed for applications that require multiple power supplies such as storage devices. It integrates an 800mA* (A/B/C Version) / 900mA* (D Version) output current step-down DC/DC converter, a 600mA output current LDO regulator, and a voltage detector with a built-in delay circuit into a small package. The regulator can be started after soft start of the DC/DC converter by sequence control. (A/B Version)

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

Specs & Datasheets

Input Voltage Range 4.5 V to 5.5 V (6.5 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 460 µA (at PWM mode)
Typ. 170 µA (at light load, Ver. B, C, D)
Standby Current Typ. 1 µA (Ver. A)
Typ. 2 µA (Ver. B, C, D)
Output Voltage Range DC/DC Section: 1.2 V to 1.8 V (0.1 V step)
LDO Section: 2.5 V to 3.3 V (0.1 V step)
Output Voltage Accuracy DC/DC Section: ±2% (Ta = 25°C)
LDO Section: ±1.0%
Output Current DC/DC Section:
800 mA
900 mA (Ver. D)
LDO Section: 600 mA
Driver ON-resistance Typ. Pch 0.25 Ω, Nch 0.25 Ω (VIN = 5 V)
Oscillator Frequency Typ. 1.2 MHz
Package DFN(PLP)2527-10
VD Threshold Range 2.0 V to 3.0 V (Ver. A, supervising LDO output voltage)
3.0 V to 5.0 V (Ver. B, C, D, supervising input voltage)
VD Threshold Accuracy ±2%
Release Delay Time Typ. 50 ms

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

RP901K Efficiency vs. Output Current

RP901K Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
DFN(PLP)2527-10 RP901K RP901K

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

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