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RP504 Series

600mA PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

  • Consumer
  • RoHS

The RP504 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP504K/L can be switched from two control types by inputting 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. (RP504N Series can be selected from forced PWM control or PWM/VFM auto switching control.)

RP504 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) and output capacitor (4.7µH) can be used by the switching of 2.25MHz. In addition to SOT-23-5 and DFN1616-6B packages, a 1.2mm × 1.6mm DFN(PLP)1216-6F package is also available.

Specs & Datasheets

Input Voltage Range 2.3 V to 5.5 V (6.5 V)
Operating Temperature Range -40°C to 85°C (125°C)
Supply Current Typ. 25 µA (VFM, no load)
Standby Current Typ. 0 µA
Output Voltage Range 0.8 V to 3.3 V (0.1 V step)
Output Voltage Accuracy ±1.5% (VOUT ≥ 1.2 V, Ta = 25°C)
±18 mV (VOUT < 1.2 V)
Output Voltage Temperature Coefficient ± 40 ppm/°C
Output Current 600 mA
Driver ON-resistance Pch: Typ. 0.34 Ω, Nch: Typ. 0.43 Ω (VIN = 3.6 V)
Oscillator Frequency Typ. 2.25 MHz
Maximum Duty Cycle Min. 100%
Package DFN(PLP)1216-6F, DFN1616-6B, 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

Typical Application

Typical Application

RP504x331x Efficiency vs. Output Current

RP504x331x Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
DFN(PLP)1212-6F RP504K RP504K
  • gradeConsumerC
DFN1616-6B RP504L RP504L
  • gradeConsumerC
SOT-23-5 RP504N RP504N-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Please contact us or our distributors for unpublished reliability information.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

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